{"id":5842,"date":"2026-08-12T14:28:38","date_gmt":"2026-08-12T06:28:38","guid":{"rendered":"https:\/\/domirefrigeration.com\/?p=5842"},"modified":"2026-08-12T14:34:38","modified_gmt":"2026-08-12T06:34:38","slug":"%eb%83%89%eb%8f%99%ea%b8%b0-%ea%b8%b0%ed%98%b8","status":"publish","type":"post","link":"https:\/\/domirefrigeration.com\/ko\/hvac-refrigeration-symbols\/","title":{"rendered":"HVAC \ubc0f \ub0c9\ub3d9 \uae30\ud638: 112\uac1c \uc57d\uc5b4, \ub2e8\uc704, \ub3c4\uba74 \ucf54\ub4dc"},"content":{"rendered":"

\"Engineer<\/p>\r\n

\r\n

\ube60\ub978 \ub2f5\ubcc0:<\/strong> HVAC symbols identify equipment, air paths, piping, control points, and operating conditions on plans, schematics, schedules, and submittals. Common examples include AHU for air-handling unit, SA for supply air, CHWS for chilled-water supply, TXV for thermostatic expansion valve, SST for saturated suction temperature, and VFD for variable-frequency drive. Always read the project legend first because the same code can carry a different meaning on another drawing.<\/p>\r\n<\/blockquote>\r\n

A drawing can look precise and still be easy to misread. HP<\/code> may mean heat pump on an equipment schedule and horsepower beside a motor. DP<\/code> may mean dew point on a psychrometric sheet or differential pressure on a control diagram. DO<\/code> may mean digital output in a controls list, while an architectural note could use it differently.<\/p>\r\n

Below, the 112 terms are grouped by the place you are most likely to encounter them. The aim is practical: help engineers, equipment designers, procurement teams, and technicians review a drawing or prepare a coil inquiry without guessing.<\/p>\r\n

One boundary matters. This list covers text codes, units, and short labels. Graphical shapes are a separate layer. Mechanical offices, manufacturers, and software libraries may draw the same component differently, so the legend on the issued document remains the controlling reference.<\/p>\r\n

How to read HVAC symbols without guessing<\/h2>\r\n

Use this five-step check before assigning a meaning to any abbreviation:<\/p>\r\n

    \r\n
  1. Find the legend.<\/strong> Look for a symbol key, abbreviation schedule, general notes, or standard detail sheet.<\/li>\r\n
  2. Identify the document type.<\/strong> A plan, P&ID, wiring diagram, sequence of operation, equipment schedule, and coil drawing use different vocabularies.<\/li>\r\n
  3. Trace the connected system.<\/strong> A code beside ductwork, hydronic piping, refrigerant tubing, or a control wire gains meaning from its connections.<\/li>\r\n
  4. Check the units.<\/strong> Temperature, pressure, airflow, water flow, and capacity values can reveal what a nearby code represents.<\/li>\r\n
  5. Confirm the revision.<\/strong> Use the issued revision and its matching schedules. A revised coil duty with an old piping diagram can create a technically consistent-looking but incorrect package.<\/li>\r\n<\/ol>\r\n

    ASHRAE Terminology<\/a> provides a broad vocabulary reference for HVAC and refrigeration. ISO 14617-1<\/a> covers general rules for graphical symbols used in diagrams. Neither removes the need to follow the legend and notes on the actual project drawing.<\/p>\r\n

    112 HVAC and refrigeration symbols at a glance<\/h2>\r\n

    Equipment and packaged-unit abbreviations<\/h3>\r\n

    These labels usually appear on floor plans, roof plans, equipment schedules, control diagrams, and submittals. The tag may be followed by a number, such as AHU-2<\/code> or RTU-5<\/code>, to identify one specific unit.<\/p>\r\n

    \"Industrial<\/p>\r\n

    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    No.<\/th>\r\nSymbol<\/th>\r\n\uc758\ubbf8<\/th>\r\nWhere it appears and what to check<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    1<\/td>\r\nAHU<\/td>\r\nAir-handling unit<\/td>\r\n\ud544\ud130, \ucf54\uc77c, \ub310\ud37c, \ud32c\uc744 \ud1b5\ud574 \uacf5\uae30\ub97c \uc870\ud654\ud558\uace0 \uc21c\ud658\uc2dc\ud0b5\ub2c8\ub2e4. \uacf5\uae30 \ud750\ub984\uc774\ub098 \ucf54\uc77c \ubd80\ud558\ub97c \uc0ac\uc6a9\ud558\uae30 \uc804\uc5d0 \ud0dc\uadf8\ub97c \uc77c\uc815\ud45c\uc640 \uc77c\uce58\uc2dc\ud0a4\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    2<\/td>\r\nRTU<\/td>\r\nRooftop unit<\/td>\r\n\uc9c0\ubd95\uc774\ub098 \uc5f0\uc11d\uc5d0 \uc124\uce58\ub418\ub294 \ud328\ud0a4\uc9c0 \uc720\ub2db. \ub0c9\ubc29 \ubc29\uc2dd, \ub09c\ubc29\uc6d0, \uc678\uae30 \uc694\uad6c\uc0ac\ud56d, \uc804\uae30 \ub370\uc774\ud130 \ubc0f \uc5f0\uc11d \ubc30\uce58\ub97c \ud655\uc778\ud558\uc138\uc694.<\/td>\r\n<\/tr>\r\n
    3<\/td>\r\nFCU<\/td>\r\nFan coil unit<\/td>\r\n\ubc29\uc774\ub098 \uad6c\uc5ed\uc744 \uc11c\ube44\uc2a4\ud558\ub294 \ud32c \ubc0f \ucf54\uc77c \uc5b4\uc148\ube14\ub9ac\uc785\ub2c8\ub2e4. \ucf54\uc77c\uc774 \ub0c9\uc628\uc218, \uc628\uc218, \uae00\ub9ac\ucf5c \ub610\ub294 \ub0c9\ub9e4\ub97c \uc0ac\uc6a9\ud558\ub294\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    4<\/td>\r\nMAU<\/td>\r\nMakeup air unit<\/td>\r\n\ubc30\uae30 \ub610\ub294 \uacf5\uc815 \uacf5\uae30\ub97c \ub300\uccb4\ud558\uae30 \uc704\ud55c \uacf5\uae30\ub97c \uacf5\uae09\ud569\ub2c8\ub2e4. \uadf8 \ubd80\ud558\ub294 \ud658\uae30 \uc870\uac74\ubcf4\ub2e4 \uc2e4\uc678 \uc124\uacc4 \uc870\uac74\uc5d0 \uc758\ud574 \uc88c\uc6b0\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    5<\/td>\r\nDOAS<\/td>\r\nDedicated outdoor air system<\/td>\r\n\uc625\uc678 \ud658\uae30 \uacf5\uae30\ub97c \uad6c\uc5ed \ud604\uc5f4 \ubd80\ud558\uc640 \ubcc4\ub3c4\ub85c \ucc98\ub9ac\ud569\ub2c8\ub2e4. \uae09\uae30 \uc870\uac74, \ud68c\uc218 \uc7a5\uce58 \ubc0f \ud558\ub958 \ub2e8\ub9d0 \uc804\ub7b5\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    6<\/td>\r\nFAHU<\/td>\r\nFresh air-handling unit<\/td>\r\n\uc678\uae30\uc5d0 \uc911\uc810\uc744 \ub454 \uacf5\uae30 \uc870\ud654\uae30\uc5d0 \ub300\ud55c \uc9c0\uc5ed \ub610\ub294 \ud504\ub85c\uc81d\ud2b8\ubcc4 \uc6a9\uc5b4\uc785\ub2c8\ub2e4. \ubc94\ub840\uc5d0\uc11c MAU \ub610\ub294 DOAS\uc640 \ub3d9\uc77c\ud55c\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    7<\/td>\r\nERV<\/td>\r\nEnergy recovery ventilator<\/td>\r\n\ubc30\uae30\uc640 \uc678\uae30 \uae30\ub958 \uac04\uc5d0 \ud604\uc5f4 \ubc0f \ub300\uac1c \uc7a0\uc5f4 \uc5d0\ub108\uc9c0\ub97c \uc804\ub2ec\ud569\ub2c8\ub2e4. \ud68c\uc218 \uc720\ud615, \ub204\uae30 \ud55c\uacc4 \ubc0f \uacb0\ube59 \ubc29\uc9c0 \uc804\ub7b5\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    8<\/td>\r\nHRV<\/td>\r\nHeat recovery ventilator<\/td>\r\n\uacf5\uae30 \ud750\ub984 \uac04\uc5d0 \ud604\uc5f4\uc744 \uc77c\ubc18\uc801\uc73c\ub85c \uc804\ub2ec\ud569\ub2c8\ub2e4. ERV\uc640\uc758 \uc815\ud655\ud55c \ucc28\uc774\uc810\uc740 \uc7a5\ube44 \uc77c\ub78c\ud45c(schedule)\uc5d0\uc11c \ud655\uc778\ud574\uc57c \ud569\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    9<\/td>\r\nCU<\/td>\r\n\uc751\ucd95 \uc720\ub2db<\/td>\r\nUsually includes a compressor and condenser. CU<\/code> can be ambiguous, so verify whether the project uses it for condensing unit, control unit, or another item.<\/td>\r\n<\/tr>\r\n
    10<\/td>\r\nACU<\/td>\r\nAir-conditioning unit<\/td>\r\n\ubc94\uc704\uac00 \ub9e4\uc6b0 \ub2e4\uc591\ud558\uac8c \uc801\uc6a9\ub418\ub294 \uc77c\ubc18\uc801\uc778 \uc7a5\ube44 \uba85\uce6d\uc785\ub2c8\ub2e4. \ubd84\ub9ac\ud615, \ud328\ud0a4\uc9c0\ud615, \uacf5\ub7ad\uc2dd \ub610\ub294 \uc218\ub0c9\uc2dd \uc911 \uc5b4\ub5a4 \ubc29\uc2dd\uc778\uc9c0 \ud655\uc778\ud558\ub824\uba74 \uc7a5\ube44 \uc77c\ub78c\ud45c\ub97c \ucc38\uc870\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    11<\/td>\r\nHP<\/td>\r\n\ud788\ud2b8 \ud38c\ud504<\/td>\r\nOften identifies reversible heating and cooling equipment. Near motors, hp<\/code> may instead mean horsepower, so capitalization and context matter.<\/td>\r\n<\/tr>\r\n
    12<\/td>\r\nWSHP<\/td>\r\nWater-source heat pump<\/td>\r\n\uc218\uc21c\ud658 \ub8e8\ud504\uc640 \uc5f4\uc744 \uad50\ud658\ud569\ub2c8\ub2e4. \ub8e8\ud504 \uc720\uc785\uc218 \uc628\ub3c4 \ubc94\uc704, \uc218\ub7c9, \uc555\ub825 \uc190\uc2e4 \ubc0f \uc751\ucd95\uc218 \uc694\uad6c \uc0ac\ud56d\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    13<\/td>\r\nVRF<\/td>\r\nVariable refrigerant flow<\/td>\r\n\ub0c9\ub9e4 \uc720\ub7c9\uc774 \uc870\uc808\ub418\ub294 \uba40\ud2f0\uc874 \uc9c1\uc811 \ud33d\ucc3d \uc2dc\uc2a4\ud15c\uc785\ub2c8\ub2e4. \ubd84\uae30 \ubc30\uad00 \uad6c\uc131, \ub4f1\uac00 \ubc30\uad00 \uae38\uc774 \ubc0f \uc81c\uc870\uc0ac \uaddc\uc815\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    14<\/td>\r\nVRV<\/td>\r\nVariable refrigerant volume<\/td>\r\nVRF \uc2dc\uc2a4\ud15c\uc5d0 \uc790\uc8fc \uc0ac\uc6a9\ub418\ub294 \uc81c\uc870\uc0ac \uad00\ub828 \uba85\uce6d\uc785\ub2c8\ub2e4. \uace0\uc720 \uc0ac\uc591\uc11c\uc5d0\uc11c \uc774 \uc6a9\uc5b4\ub4e4\uc774 \uc0c1\ud638 \ud638\ud658\ub41c\ub2e4\uace0 \uac00\uc815\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    15<\/td>\r\nCRAC<\/td>\r\nComputer room air conditioner<\/td>\r\n\ud65c\uc131 \ub0c9\ub3d9 \ud68c\ub85c\uac00 \uc788\ub294 \uc815\ubc00 \ub0c9\ubc29 \uc7a5\ube44\uc785\ub2c8\ub2e4. \uacf5\uae30 \ud1a0\ucd9c \ud328\ud134, \uc774\uc911\ud654, \uc2b5\ub3c4 \uc81c\uc5b4 \ubc0f \ubc29\uc5f4 \ubc29\uc2dd\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    16<\/td>\r\nCRAH<\/td>\r\nComputer room air handler<\/td>\r\n\ub0c9\uc218\uc640 \uc8fc\ub85c \uc5f0\uacb0\ub418\ub294 \uc815\ubc00 \uacf5\uae30 \uc870\ud654 \uc7a5\ube44\uc785\ub2c8\ub2e4. \ucf54\uc77c \ubd80\ud558, \uc218\uc628, \ud32c \uc81c\uc5b4 \ubc0f \ubc14\ub2e5 \ud558\ubd80 \ub610\ub294 \uc0c1\ubd80 \ud1a0\ucd9c \ubc29\uc2dd\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    Airside and duct-system abbreviations<\/h3>\r\n

    Airside codes describe where air came from, where it is going, and how much of it moves through a duct or unit. The same fan can have several airflow values, so distinguish scheduled design airflow from measured or minimum airflow.<\/p>\r\n

    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    No.<\/th>\r\nSymbol<\/th>\r\n\uc758\ubbf8<\/th>\r\nWhere it appears and what to check<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    17<\/td>\r\nSA<\/td>\r\nSupply air<\/td>\r\n\uc7a5\ube44\ub098 \ud130\ubbf8\ub110\uc744 \ub098\uc640 \uc11c\ube44\uc2a4 \uacf5\uac04\uc73c\ub85c \ud5a5\ud558\ub294 \uacf5\uc870\ub41c \uacf5\uae30. \uc5b8\uae09\ub41c \uc628\ub3c4\uac00 \ucf54\uc77c, \uc7a5\ube44 \ub610\ub294 \uc2e4\ub0b4 \ub514\ud4e8\uc800\uc5d0\uc11c\uc758 \uc628\ub3c4\uc778\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    18<\/td>\r\nRA<\/td>\r\nReturn air<\/td>\r\n\uc2e4\ub0b4\uc5d0\uc11c \uc7a5\ube44\ub85c \ub418\ub3cc\uc544\uac00\ub294 \uacf5\uae30. \ubc18\uc1a1\ub85c\ub294 \ucc9c\uc7a5 \ud50c\ub9ac\ub118, \ub355\ud2b8, \uc774\ub3d9 \uadf8\ub9b4 \ubc0f \ubc30\ucd9c \uacbd\ub85c\ub97c \ud3ec\ud568\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    19<\/td>\r\nOA<\/td>\r\nOutdoor air<\/td>\r\n\uc2e4\uc678\uc5d0\uc11c \uc2dc\uc2a4\ud15c\uc73c\ub85c \uc720\uc785\ub418\ub294 \uacf5\uae30. \uc124\uacc4 \uc628\ub3c4, \uc2b5\ub3c4, \ucd5c\uc18c \ud658\uae30\ub7c9, \ud761\uae30 \uc704\uce58\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    20<\/td>\r\nEA<\/td>\r\nExhaust air<\/td>\r\nAir discharged from a building or process. Do not confuse it with relief air, which may vary with building pressure.<\/td>\r\n<\/tr>\r\n
    21<\/td>\r\nFA<\/td>\r\nFresh air<\/td>\r\nOften means outdoor ventilation air, but some drawings use another definition. The legend should confirm whether FA<\/code> \ubc0f OA<\/code> are equivalent.<\/td>\r\n<\/tr>\r\n
    22<\/td>\r\nMA<\/td>\r\nMixed air<\/td>\r\n\ucf54\uc77c\uc774\ub098 \uacf5\uae30 \ucc98\ub9ac\uae30\ub85c \uc720\uc785\ub418\ub294 \uc678\uae30\uc640 \ud658\uae30\uc758 \ud63c\ud569\ubb3c. \ud63c\ud569 \uacf5\uae30 \uc0c1\ud0dc\ub294 \ucf54\uc77c \uc120\uc815\uc758 \uc911\uc694\ud55c \uc785\ub825 \uc694\uc18c\uc785\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    23<\/td>\r\nTA<\/td>\r\nTransfer air<\/td>\r\n\uc9c1\uc811 \uacf5\uae09\ub418\uc9c0 \uc54a\uace0 \ud55c \uacf5\uac04\uc5d0\uc11c \ub2e4\ub978 \uacf5\uac04\uc73c\ub85c \uc774\ub3d9\ud558\ub294 \uacf5\uae30. \uac1c\uad6c\ubd80\ub098 \ub355\ud2b8\uc5d0 \ub300\ud55c \uc555\ub825 \uad00\uacc4 \ubc0f \ubc95\uaddc \uc694\uad6c \uc0ac\ud56d\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    24<\/td>\r\nCFM<\/td>\r\nCubic feet per minute<\/td>\r\n\uc778\uce58-\ud30c\uc6b4\ub4dc \ub2e8\uc704\uacc4\uc5d0\uc11c \uc0ac\uc6a9\ub418\ub294 \uae30\ub958 \ub2e8\uc704. \ud574\ub2f9 \uac12\uc774 \uc2e4\uc81c, \ud45c\uc900, \uc124\uacc4, \ucd5c\uc18c \ub610\ub294 \uce21\uc815\ub41c \uae30\ub958\uc778\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    25<\/td>\r\nL\/s<\/td>\r\nLitres per second<\/td>\r\nSI \uc720\ub3c4 \uacf5\uae30 \ud750\ub984 \ub2e8\uc704\uc785\ub2c8\ub2e4. \ub2e8\uc704 \uae30\ud638\ub294 \uc77c\ubc18\uc801\uc778 \ubcf5\uc218\ud615 \uc57d\uc5b4\ubcf4\ub2e4 \uad00\ub840\ub97c \ub530\ub974\uae30 \ub54c\ubb38\uc5d0 \ub300\uc18c\ubb38\uc790\uc640 \uc2ac\ub798\uc2dc \ubc30\uce58\uac00 \uc911\uc694\ud569\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    26<\/td>\r\nACH<\/td>\r\nAir changes per hour<\/td>\r\n\uc2e4\ub0b4 \ud48d\ub7c9\uc744 \uc2dc\uac04\ub2f9 \uc2e4\ub0b4 \ubd80\ud53c\ub85c \ub098\ub208 \uac12\uc785\ub2c8\ub2e4. \uacc4\uc0b0 \uc2dc \uacf5\uae09, \ubc30\uae30, \uc678\uae30 \ub610\ub294 \uc7ac\uc21c\ud658 \uacf5\uae30 \uc911 \uc5b4\ub5a4 \uac83\uc744 \uc0ac\uc6a9\ud558\ub294\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    27<\/td>\r\nFPM<\/td>\r\nFeet per minute<\/td>\r\n\ub355\ud2b8, \uadf8\ub9b4, \ud544\ud130 \ubc0f \ucf54\uc77c \uba74(face) \uac80\uc0ac\uc5d0 \uc0ac\uc6a9\ub418\ub294 \ud48d\uc18d. \ub192\uc740 \uba74\uc18d\ub3c4\ub294 \uc555\ub825 \uc190\uac15\uacfc \uc218\ubd84 \ube44\uc0b0\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce60 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    28<\/td>\r\nESP<\/td>\r\nExternal static pressure<\/td>\r\n\ud328\ud0a4\uc9c0 \uc720\ub2db \ub610\ub294 \ud32c \uc139\uc158 \uc678\ubd80\uc758 \uc800\ud56d. \uba85\uc2dc\ub41c \uacbd\uacc4\uc5d0 \uc5b4\ub5a4 \ubd80\uc18d\ud488\uacfc \ub355\ud2b8 \uc139\uc158\uc774 \ud3ec\ud568\ub418\uc5b4 \uc788\ub294\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    29<\/td>\r\nTSP<\/td>\r\nTotal static pressure<\/td>\r\n\ud32c \ub610\ub294 \uc2dc\uc2a4\ud15c\uc5d0 \ub300\ud55c \ub354 \ub113\uc740 \uc815\uc555 \uc694\uad6c \uc0ac\ud56d. \uce21\uc815 \uae30\uc900\uc810\uc740 \ud32c \uc120\uc815\uacfc \uc77c\uce58\ud574\uc57c \ud569\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    30<\/td>\r\nVAV<\/td>\r\nVariable air volume<\/td>\r\n\ud48d\ub7c9\uc744 \uac00\ubcc0\ud558\ub294 \uc2dc\uc2a4\ud15c \ub610\ub294 \ud130\ubbf8\ub110. \ucd5c\uc18c \uc720\ub7c9, \uc7ac\uac00\uc5f4, \ud658\uae30 \uc81c\uc5b4 \ubc0f \uc18c\uc74c \ud55c\uacc4\ub97c \uac80\ud1a0\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    31<\/td>\r\nCAV<\/td>\r\nConstant air volume<\/td>\r\n\uc124\uc815\ub41c \uacf5\uae30 \uc720\ub7c9\uc744 \uc720\uc9c0\ud558\ub3c4\ub85d \uc124\uacc4\ub41c \uc2dc\uc2a4\ud15c \ub610\ub294 \ud130\ubbf8\ub110. \uacf5\uae30 \uc628\ub3c4\ub294 \uc5ec\uc804\ud788 \uc7ac\uc124\uc815\ub418\uac70\ub098 \ub2e8\uacc4\ubcc4\ub85c \uc870\uc808\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    32<\/td>\r\nVCD<\/td>\r\nVolume control damper<\/td>\r\n\uacf5\uae30 \ud750\ub984\uc744 \uc870\uc808\ud558\ub294 \ub370 \uc0ac\uc6a9\ub418\ub294 \uc218\ub3d9 \ub610\ub294 \uad6c\ub3d9\uc2dd \ub310\ud37c. \ube14\ub808\uc774\ub4dc \uc720\ud615, \ud06c\uae30, \uc561\ucd94\uc5d0\uc774\ud130, \uc811\uadfc\uc131 \ubc0f \ud544\uc218 \uc704\uce58\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    Hydronic and water-side abbreviations<\/h3>\r\n

    Hydronic codes often sit beside piping arrows and equipment connections. Supply and return labels can be defined from the plant’s point of view or the connected unit’s point of view, so follow the flow arrows.<\/p>\r\n

    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    No.<\/th>\r\nSymbol<\/th>\r\n\uc758\ubbf8<\/th>\r\nWhere it appears and what to check<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    33<\/td>\r\nCHWS<\/td>\r\nChilled-water supply<\/td>\r\n\ub0c9\ub3d9\uae30 \ub610\ub294 \ud50c\ub79c\ud2b8\uc5d0\uc11c \ub0c9\uac01 \ucf54\uc77c\ub85c \uacf5\uae09\ub418\ub294 \ubb3c. \ucf54\uc77c \uc131\ub2a5 \uc815\uaca9\uc5d0 \uc0ac\uc6a9\ub418\ub294 \uc2e4\uc81c \uacf5\uae09 \uc628\ub3c4\ub97c \uae30\ub85d\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    34<\/td>\r\nCHWR<\/td>\r\nChilled-water return<\/td>\r\n\uc5f4\uc744 \ud761\uc218\ud55c \ud6c4 \ud50c\ub79c\ud2b8\ub85c \ub3cc\uc544\uc624\ub294 \ubb3c. CHWR\uacfc CHWS\uc758 \ucc28\uc774\uac00 \ud544\uc694\ud55c \uc720\ub7c9\uc744 \uacb0\uc815\ud569\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    35<\/td>\r\nHWS<\/td>\r\nHot-water supply<\/td>\r\n\ucf54\uc77c\uc774\ub098 \ub9d0\ub2e8 \uc7a5\ube44\ub85c \uc804\ub2ec\ub418\ub294 \ub09c\ubc29\uc218. \uc628\ub3c4, \uae00\ub9ac\ucf5c \ub18d\ub3c4, \uc81c\uc5b4 \ubc38\ube0c \uad6c\uc131\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    36<\/td>\r\nHWR<\/td>\r\nHot-water return<\/td>\r\nWater returning after releasing heat. Low return temperature may affect plant performance and coil sizing.<\/td>\r\n<\/tr>\r\n
    37<\/td>\r\nCWS<\/td>\r\nCondenser-water supply<\/td>\r\n\uc218\ub0c9\uc2dd \uc751\ucd95\uae30\ub85c \uacf5\uae09\ub418\ub294 \ubb3c\ub85c, \ub300\uac1c \ub0c9\uac01\ud0d1\uc5d0\uc11c \uacf5\uae09\ub429\ub2c8\ub2e4. \ub0c9\uc218 \uacf5\uae09\uacfc \ud63c\ub3d9\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    38<\/td>\r\nCWR<\/td>\r\nCondenser-water return<\/td>\r\nWater returning from the condenser to the heat-rejection equipment. Check the drawing’s supply and return convention.<\/td>\r\n<\/tr>\r\n
    39<\/td>\r\nEWT<\/td>\r\nEntering water temperature<\/td>\r\n\uc7a5\ube44 \uc785\uad6c\uc5d0\uc11c\uc758 \ubb3c \ub610\ub294 \uae00\ub9ac\ucf5c \uc628\ub3c4. \uc720\uc785 \uacf5\uae30 \uc870\uac74, \uc720\ub7c9 \ubc0f \uc720\uccb4 \ub18d\ub3c4\uc640 \ud568\uaed8 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    40<\/td>\r\nLWT<\/td>\r\nLeaving water temperature<\/td>\r\n\uc7a5\ube44 \ucd9c\uad6c\uc758 \uc720\uccb4 \uc628\ub3c4. \ubd80\ud558, \uc720\ub7c9 \ubc0f \uc5f4\uad50\ud658\uae30 \uc131\ub2a5\uc758 \uacb0\uacfc\uc785\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    41<\/td>\r\nGPM<\/td>\r\nGallons per minute<\/td>\r\n\uc778\uce58\ud30c\uc6b4\ub4dc \ub2e8\uc704\uacc4\uc5d0\uc11c \ubd80\ud53c \uae30\uc900 \ubb3c \uc720\ub7c9 \ub2e8\uc704\uc785\ub2c8\ub2e4. \uac24\ub7f0\uc774 \ubbf8\uad6d \uac24\ub7f0\uc778\uc9c0 \uc5ec\ubd80\ub97c \uba85\uc2dc\ud558\uace0 \uc720\uccb4\ub97c \uc2dd\ubcc4\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    42<\/td>\r\nL\/min<\/td>\r\nLitres per minute<\/td>\r\n\ubbf8\ud130\ubc95 \uccb4\uc801 \uc720\ub7c9 \ub2e8\uc704\uc785\ub2c8\ub2e4. \ub2e8\uc704\ub97c \uac12\uc5d0 \ubd99\uc5ec\uc11c \uc720\uc9c0\ud558\uace0 \ube44\uacf5\uc2dd\uc801\uc778 \uc57d\uc5b4\ub85c \ub2e4\uc2dc \uc4f0\uc9c0 \ub9c8\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    43<\/td>\r\n\u0394T<\/td>\r\n\uc628\ub3c4 \ucc28\uc774<\/td>\r\n\ub450 \uc628\ub3c4 \uac04\uc758 \ucc28\uc774\uc785\ub2c8\ub2e4. \ub2e8\uc21c\ud55c \ub378\ud0c0 \uac12\ub9cc \ub098\uc5f4\ud558\ub294 \ub300\uc2e0, \uc785\uad6c \ubc0f \ucd9c\uad6c \uc218\uc628\uacfc \uac19\uc774 \uc9c0\uc810\uc744 \uba85\uc2dc\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    44<\/td>\r\n\u0394P<\/td>\r\nPressure difference<\/td>\r\n\ub450 \uc9c0\uc810 \uac04\uc758 \uc555\ub825 \uc190\uc2e4 \ub610\ub294 \ucc28\uc555. \ud574\ub2f9 \uac12\uc774 \ucf54\uc77c, \ubc38\ube0c, \ud68c\ub85c \ub610\ub294 \uc804\uccb4 \uc2dc\uc2a4\ud15c \uc911 \uc5b4\ub514\uc5d0 \uc801\uc6a9\ub418\ub294\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    45<\/td>\r\nTDH<\/td>\r\nTotal dynamic head<\/td>\r\n\uc815\uc758\ub41c \uc2dc\uc2a4\ud15c\uc758 \uace0\ub3c4, \uc555\ub825, \uc18d\ub3c4 \ubc0f \ub9c8\ucc30 \ud6a8\uacfc\ub97c \uadf9\ubcf5\ud558\ub294 \ub370 \ud544\uc694\ud55c \ud38c\ud504 \uc591\uc815. \uacc4\uc0b0 \uacbd\uacc4\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    46<\/td>\r\nPHE<\/td>\r\nPlate heat exchanger<\/td>\r\n\uc77c\ubc18\uc801\uc778 \ud310\ud615 \uc5f4\uad50\ud658\uae30\uc785\ub2c8\ub2e4. \uc77c\uc815\ud45c\uc5d0\ub294 \uac00\uc2a4\ucf13\ud615, \ube0c\ub808\uc774\uc988\ud615, \uc6a9\uc811\ud615 \ub610\ub294 \uae30\ud0c0 \uad6c\uc870\uac00 \uba85\uc2dc\ub418\uc5b4\uc57c \ud569\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    47<\/td>\r\nBPHX<\/td>\r\nBrazed-plate heat exchanger<\/td>\r\n\ube0c\ub808\uc774\uc9d5 \ucc98\ub9ac\ub41c \ud50c\ub808\uc774\ud2b8\ub85c \ub9cc\ub4e0 \ucf64\ud329\ud2b8\ud55c \uc5f4\uad50\ud658\uae30\uc785\ub2c8\ub2e4. \uc720\uccb4 \uc801\ud569\uc131, \uc124\uacc4 \uc555\ub825, \uc624\uc5fc \uc704\ud5d8 \ubc0f \uc815\ube44 \uc804\ub7b5\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    48<\/td>\r\nET<\/td>\r\n\ud33d\ucc3d \ud0f1\ud06c<\/td>\r\n\ubc00\ud3d0\ud615 \ub09c\ubc29\/\ub0c9\uc218 \uc2dc\uc2a4\ud15c\uc758 \uc720\uccb4 \ubd80\ud53c \ubcc0\ud654\ub97c \uc218\uc6a9\ud569\ub2c8\ub2e4. \uc5f0\uacb0 \uc9c0\uc810, \uc608\uc555, \ud5c8\uc6a9 \ubd80\ud53c \ubc0f \uc555\ub825 \uc815\uaca9\uc744 \uc810\uac80\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    Refrigeration component abbreviations<\/h3>\r\n

    These codes are common on refrigeration schematics, P&IDs, equipment schedules, control sequences, and service documentation. The same component can be drawn with different shapes, but its connected piping often reveals its function.<\/p>\r\n

    \"Refrigeration<\/p>\r\n

    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    No.<\/th>\r\nSymbol<\/th>\r\n\uc758\ubbf8<\/th>\r\nWhere it appears and what to check<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    49<\/td>\r\nCOMP<\/td>\r\n\uc555\ucd95\uae30<\/td>\r\n\ub0c9\ub9e4 \uc99d\uae30\uc758 \uc555\ub825\uacfc \uc628\ub3c4\ub97c \uc0c1\uc2b9\uc2dc\ud0b5\ub2c8\ub2e4. \ub0c9\ub9e4, \uc6a9\ub7c9 \ud3ec\uc778\ud2b8, \uc18d\ub3c4 \uc81c\uc5b4, \uc624\uc77c \uad00\ub9ac \ubc0f \uc791\ub3d9 \uc601\uc5ed\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    50<\/td>\r\nCOND<\/td>\r\n\ucf58\ub374\uc11c<\/td>\r\n\uc5f4\uc744 \ubc29\ucd9c\ud558\uace0 \ub0c9\ub9e4\ub97c \uc751\ucd95\ud569\ub2c8\ub2e4. \uc774 \uc57d\uc5b4\ub294 \ucf54\uc77c, \uc258 \uc564 \ud22c\ube0c \uc720\ub2db \ub610\ub294 \uc644\uc804\ud55c \ubc29\uc5f4\ubd80\ub97c \uc9c0\uce6d\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    51<\/td>\r\nEVAP<\/td>\r\n\uc99d\ubc1c\uae30<\/td>\r\n\ub0c9\ub9e4\uac00 \uc99d\ubc1c\ud558\uba74\uc11c \uc5f4\uc744 \ud761\uc218\ud569\ub2c8\ub2e4. \uc801\uc6a9 \uc628\ub3c4, \uacf5\uae09 \ubc29\uc2dd, \uacfc\uc5f4\ub3c4 \uc81c\uc5b4, \uc131\uc5d0 \ubc0f \ubc30\uc218\ub97c \uc810\uac80\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    52<\/td>\r\nTXV<\/td>\r\n\uac10\uc628\uc2dd \ud33d\ucc3d \ubc38\ube0c<\/td>\r\n\uc628\ub3c4 \uac10\uc9c0 \uc694\uc18c\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub0c9\ub9e4\ub97c \uacc4\ub7c9\ud569\ub2c8\ub2e4. \ub0c9\ub9e4, \uc6a9\ub7c9, \uade0\uc555\uae30, \ucda9\uc804\ub7c9 \ubc0f \uc120\ud0dd\ub41c \uacfc\uc5f4\ub3c4 \ubc94\uc704\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    53<\/td>\r\nTEV<\/td>\r\n\uac10\uc628\uc2dd \ud33d\ucc3d \ubc38\ube0c<\/td>\r\nTXV\uc758 \ub300\uccb4 \uc57d\uc5b4\uc785\ub2c8\ub2e4. \ub2e4\ub978 \uc7a5\uce58\ub85c \uac00\uc815\ud558\uc9c0 \ub9d0\uace0 \ud504\ub85c\uc81d\ud2b8\ub098 \uc81c\uc870\uc5c5\uccb4\uc758 \uad00\ub840\ub97c \uc77c\uad00\ub418\uac8c \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    54<\/td>\r\nEEV<\/td>\r\n\uc804\uc790\uc2dd \ud33d\ucc3d \ubc38\ube0c<\/td>\r\n\uc804\uc790 \uc81c\uc5b4\uc5d0 \ub530\ub77c \ub0c9\ub9e4\ub97c \uacc4\ub7c9\ud569\ub2c8\ub2e4. \ub4dc\ub77c\uc774\ubc84, \uc2a4\ud15d \uc218 \ub610\ub294 \uc2e0\ud638, \uc81c\uc5b4 \ub85c\uc9c1, \ud398\uc77c \ud3ec\uc9c0\uc158\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    55<\/td>\r\nLLSV<\/td>\r\nLiquid-line solenoid valve<\/td>\r\n\uc561\uccb4 \ub0c9\ub9e4\uc758 \ud750\ub984\uc744 \uc5f4\uac70\ub098 \ub2eb\uc2b5\ub2c8\ub2e4. \uc804\uc555, \uc555\ub825 \ucc28\uc774, \ud750\ub984 \ubc29\ud5a5, \uc6a9\ub7c9 \ubc0f \ud38c\ud504\ub2e4\uc6b4 \uc21c\uc11c\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    56<\/td>\r\nRV<\/td>\r\nReversing valve<\/td>\r\nRedirects refrigerant flow in a heat pump. RV<\/code> can also mean relief valve, so trace the ports and read the schedule.<\/td>\r\n<\/tr>\r\n
    57<\/td>\r\nF\/D<\/td>\r\n\ud544\ud130 \ub4dc\ub77c\uc774\uc5b4<\/td>\r\n\ub0c9\ub9e4 \ud68c\ub85c\uc5d0\uc11c \uc774\ubb3c\uc9c8\uacfc \uc218\ubd84\uc744 \uc81c\uac70\ud569\ub2c8\ub2e4. \ubc30\uad00 \uc704\uce58, \uc720\ub7c9 \ubc29\ud5a5, \ud06c\uae30, \uad50\uccb4\ud615 \ub610\ub294 \ubc00\ud3d0\ud615 \uad6c\uc870\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    58<\/td>\r\nSG<\/td>\r\n\uc0ac\uc774\ud2b8 \uae00\ub77c\uc2a4<\/td>\r\n\uc721\uc548\uc73c\ub85c \uc0c1\ud0dc\ub97c \ud655\uc778\ud560 \uc218 \uc788\ub294 \ud45c\uc2dc\uae30\ub97c \uc81c\uacf5\ud558\uba70, \ub300\uac1c \uc218\ubd84 \uac10\uc9c0 \uc18c\uc790\uac00 \ud3ec\ud568\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \uac70\ud488\uc740 \ubd80\ud558, \uacfc\ub0c9\ub3c4, \uc2dc\uc2a4\ud15c \uc0c1\ud0dc\uc640 \uc5f0\uad00\uc9c0\uc5b4\uc11c\ub9cc \ud574\uc11d\ud574\uc57c \ud569\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    59<\/td>\r\nLR<\/td>\r\n\uc218\uc561\uae30<\/td>\r\n\uc561\uccb4 \ub0c9\ub9e4\ub97c \uc800\uc7a5\ud558\uace0 \ucda9\uc804\ub7c9\uc744 \uad00\ub9ac\ud558\ub294 \ub370 \ub3c4\uc6c0\uc744 \uc90d\ub2c8\ub2e4. \uc6a9\ub7c9, \ubc29\ud5a5, \uc124\uacc4 \uc555\ub825, \ubc38\ube0c \ubc0f \uc801\uc6a9 \uac00\ub2a5\ud55c \uc548\uc804 \uc694\uad6c \uc0ac\ud56d\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    60<\/td>\r\nACC<\/td>\r\n\ud761\uc785 \uc5b4\ud050\ubbac\ub808\uc774\ud130<\/td>\r\n\uc561\uccb4 \ub0c9\ub9e4\uac00 \uc555\ucd95\uae30\ub85c \uc720\uc785\ub418\ub294 \uac83\uc744 \ubc29\uc9c0\ud569\ub2c8\ub2e4. \uc624\uc77c \ud68c\uc218, \uc555\ub825 \uac15\ud558, \uc6a9\ub7c9 \ubc0f \ubc29\ud5a5\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    61<\/td>\r\nO\/S<\/td>\r\n\uc720\ubd84\ub9ac\uae30<\/td>\r\n\ud1a0\ucd9c \uac00\uc2a4\uc5d0\uc11c \uc624\uc77c\uc744 \ubd84\ub9ac\ud558\uc5ec \ud68c\uc218\ud558\uac70\ub098 \uad00\ub9ac\ud569\ub2c8\ub2e4. \ud68c\uc218 \ubc29\uc2dd\uacfc \uc555\ub825 \uc870\uac74\uc774 \uc120\uc815\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce69\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    62<\/td>\r\nO\/R<\/td>\r\n\uc624\uc77c \ub9ac\uc800\ubc84<\/td>\r\n\ub2e4\uc911 \uc555\ucd95\uae30 \ub610\ub294 \uad00\ub9ac\ud615 \uc624\uc77c \uc2dc\uc2a4\ud15c\uc5d0\uc11c \ubd84\ubc30\ud560 \uc624\uc77c\uc744 \ubcf4\uad00\ud569\ub2c8\ub2e4. \ub808\ubca8 \ucee8\ud2b8\ub864, \uc555\ub825 \uc870\uc808 \ubc0f \uc5f0\uacb0 \uc0c1\ud0dc\ub97c \uc810\uac80\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    63<\/td>\r\nCPR<\/td>\r\n\ud06c\ub7ad\ud06c\ucf00\uc774\uc2a4 \uc555\ub825 \uc870\uc808\uae30<\/td>\r\n\uace0\ubd80\ud558 \uc870\uac74\uc5d0\uc11c \uc555\ucd95\uae30 \ud761\uc785 \uc555\ub825\uc744 \uc81c\ud55c\ud569\ub2c8\ub2e4. \uc124\uc815\uc810, \uc6a9\ub7c9 \ubc0f \uae30\ud0c0 \uc81c\uc5b4 \uc7a5\uce58\uc640\uc758 \uc0c1\ud638 \uc791\uc6a9\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    64<\/td>\r\nEPR<\/td>\r\nEvaporator pressure regulator<\/td>\r\n\ubc38\ube0c \uc0c1\ub958\uc758 \ucd5c\uc18c \uc99d\ubc1c\uae30 \uc555\ub825\uc744 \uc720\uc9c0\ud569\ub2c8\ub2e4. \uc99d\ubc1c\uae30\uac00 \uc11c\ub85c \ub2e4\ub978 \uc628\ub3c4\uc5d0\uc11c \uc791\ub3d9\ud560 \ub54c \uc790\uc8fc \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    Refrigerant piping and operating-condition codes<\/h3>\r\n

    This group contains some of the most consequential labels in a coil selection. A pressure or temperature value without its reference condition can move the design point enough to change circuiting, tube count, and control selection.<\/p>\r\n

    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    No.<\/th>\r\nSymbol<\/th>\r\n\uc758\ubbf8<\/th>\r\nWhere it appears and what to check<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    65<\/td>\r\nSL<\/td>\r\nSuction line<\/td>\r\n\uc99d\ubc1c\uae30\uc5d0\uc11c \uc555\ucd95\uae30\ub85c \uc800\uc555 \uc99d\uae30\ub97c \uc6b4\ubc18\ud569\ub2c8\ub2e4. \uc18d\ub3c4, \uc624\uc77c \ud68c\uc218, \ub2e8\uc5f4, \uacbd\uc0ac \ubc0f \uc555\ub825 \uac15\ud558\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    66<\/td>\r\nDL<\/td>\r\nDischarge line<\/td>\r\n\uc555\ucd95\uae30\uc5d0\uc11c \uace0\uc555 \uc99d\uae30\ub97c \uc6b4\ubc18\ud569\ub2c8\ub2e4. \uc628\ub3c4, \uc624\uc77c \uc774\uc1a1, \uc9c4\ub3d9, \uc9c0\uc9c0\ub300 \ubc0f \uc555\ub825 \uc815\uaca9\uc744 \uac80\ud1a0\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    67<\/td>\r\nLL<\/td>\r\nLiquid line<\/td>\r\n\uc751\ucd95\ub41c \uc561\uccb4 \ub0c9\ub9e4\ub97c \ud33d\ucc3d \uc7a5\uce58\ub85c \uc774\uc1a1\ud569\ub2c8\ub2e4. \uc555\ub825 \uac15\ud558\uc640 \uc5f4 \uc720\uc785\uc740 \uac00\uc6a9 \uacfc\ub0c9\ub3c4\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce69\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    68<\/td>\r\nHGL<\/td>\r\nHot-gas line<\/td>\r\n\uc81c\uc0c1, \uc7ac\uc5f4, \uc6a9\ub7c9 \uc81c\uc5b4 \ub610\ub294 \uae30\ud0c0 \uae30\ub2a5\uc744 \uc704\ud574 \ub728\uac70\uc6b4 \ud1a0\ucd9c \uac00\uc2a4\ub97c \uc774\uc1a1\ud569\ub2c8\ub2e4. \uc791\ub3d9 \ubaa8\ub4dc\uc640 \uc81c\uc5b4 \ubc29\uc2dd\uc744 \uc815\uc758\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    69<\/td>\r\nSST<\/td>\r\nSaturated suction temperature<\/td>\r\n\uc9c0\uc815\ub41c \ub0c9\ub9e4\uc758 \ud761\uc785 \uce21 \uc555\ub825\uc5d0 \ud574\ub2f9\ud558\ub294 \ud3ec\ud654 \uc628\ub3c4. \uce21\uc815\ub41c \ud761\uc785 \ubc30\uad00 \uc628\ub3c4\ub97c \ub300\uc2e0 \uc0ac\uc6a9\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    70<\/td>\r\nSCT<\/td>\r\nSaturated condensing temperature<\/td>\r\n\uc751\ucd95 \uce21 \uc555\ub825\uc5d0 \ud574\ub2f9\ud558\ub294 \ud3ec\ud654 \uc628\ub3c4. \ud63c\ud569\ubb3c\uc758 \uacbd\uc6b0 \uc774\uc2ac\uc810 \ub610\ub294 \ubc84\ube14\uc810 \uae30\uc900 \uc911 \uc5b4\ub5a4 \uac83\uc774 \uc0ac\uc6a9\ub418\ub294\uc9c0 \uba85\uc2dc\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    71<\/td>\r\nSH<\/td>\r\n\uacfc\uc5f4<\/td>\r\n\ub3d9\uc77c \uc555\ub825\uc5d0\uc11c\uc758 \ud3ec\ud654 \uc628\ub3c4\ubcf4\ub2e4 \ub192\uc740 \uc99d\uae30 \uc628\ub3c4. \ud574\ub2f9 \uac12\uc774 \uc99d\ubc1c\uae30 \ucd9c\uad6c\uc778\uc9c0 \uc555\ucd95\uae30 \uc785\uad6c\uc778\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    72<\/td>\r\nSC<\/td>\r\n\uc11c\ube0c\ucfe8\ub9c1<\/td>\r\n\ub3d9\uc77c \uc555\ub825\uc5d0\uc11c\uc758 \ud3ec\ud654 \uc628\ub3c4 \uc774\ud558\uc758 \uc561\uccb4 \uc628\ub3c4. \uce21\uc815 \uc704\uce58\uc640 \ub0c9\ub9e4 \uae30\uc900\uc744 \ud655\uc778\ud558\uc138\uc694.<\/td>\r\n<\/tr>\r\n
    73<\/td>\r\nTD<\/td>\r\n\uc628\ub3c4 \ucc28\uc774<\/td>\r\n\uba85\uba85\ub41c \ub450 \uc628\ub3c4 \uac04\uc758 \uc77c\ubc18\uc801\uc778 \ucc28\uc774. \uc2e4\ub0b4 \ub300 \uc99d\ubc1c\uae30, \uacf5\uae30 \ub300 \uc720\uccb4, \ub610\ub294 \uae30\ud0c0 \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c \uc815\uc758\ub41c \ud55c \uc30d\uc744 \uc758\ubbf8\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    74<\/td>\r\npsig<\/td>\r\nPounds per square inch, gauge<\/td>\r\n\ud604\uc9c0 \ub300\uae30\uc555\uc744 \uae30\uc900\uc73c\ub85c \uce21\uc815\ub41c \uc555\ub825\uc785\ub2c8\ub2e4. \ud504\ub85c\uc81d\ud2b8 \ud45c\uc900\uc5d0 \ud45c\uc2dc\ub41c \uc18c\ubb38\uc790 \ub2e8\uc704 \ud615\uc2dd\uc744 \uc0ac\uc6a9\ud558\uc138\uc694.<\/td>\r\n<\/tr>\r\n
    75<\/td>\r\npsia<\/td>\r\nPounds per square inch, absolute<\/td>\r\n\uc9c4\uacf5\uc744 \uae30\uc900\uc73c\ub85c \uce21\uc815\ub41c \uc555\ub825\uc785\ub2c8\ub2e4. \uc5f4\uc5ed\ud559\uc801 \uacc4\uc0b0\uc5d0\uc11c \uac8c\uc774\uc9c0 \uc555\ub825\uacfc \uc0c1\ud638 \uad50\ud658\ud558\uc5ec \uc0ac\uc6a9\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    76<\/td>\r\nkPa<\/td>\r\nKilopascal<\/td>\r\nSI \uc555\ub825 \ub2e8\uc704\uc785\ub2c8\ub2e4. \ub2e8\uc704 \uae30\ud638\ub294 \ubcf5\uc218\ud615\uc73c\ub85c \uc4f0\uc774\uc9c0 \uc54a\uc73c\uba70, \uc77c\ubc18\uc801\uc73c\ub85c \ub9c8\uce68\ud45c\ub97c \ucc0d\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    77<\/td>\r\nbar<\/td>\r\nBar<\/td>\r\n\ub9ce\uc740 \ub0c9\ub3d9 \ubb38\uc11c\uc5d0\uc11c \uc0ac\uc6a9\ub418\ub294 \uc555\ub825 \ub2e8\uc704\uc785\ub2c8\ub2e4. \uad6c\ubd84\uc774 \uc911\uc694\ud560 \ub54c\ub294 \uac8c\uc774\uc9c0 \uc555\ub825\uc778\uc9c0 \uc808\ub300 \uc555\ub825\uc778\uc9c0 \uba85\uc2dc\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    78<\/td>\r\nDP<\/td>\r\nDew point<\/td>\r\nThe temperature at which vapor begins to condense under the stated condition. DP<\/code> may also mean differential pressure, so context is essential.<\/td>\r\n<\/tr>\r\n
    79<\/td>\r\nBP<\/td>\r\nBubble point<\/td>\r\nFor a refrigerant blend, the condition at which the first bubble of vapor forms from liquid. BP<\/code> can have other project meanings.<\/td>\r\n<\/tr>\r\n
    80<\/td>\r\nP-T<\/td>\r\nPressure-temperature relationship<\/td>\r\n\ub0c9\ub9e4 \ud3ec\ud654 \uc555\ub825\uacfc \uc628\ub3c4\ub97c \uc5f0\uacb0\ud558\ub294 \ud45c \ub610\ub294 \ucc28\ud2b8\uc785\ub2c8\ub2e4. \ud574\ub2f9\ub418\ub294 \uacbd\uc6b0 \uc62c\ubc14\ub978 \ub0c9\ub9e4\uc640 \uc774\uc2ac\uc810 \ub610\ub294 \uac70\ud488\uc810 \uc5f4\uc744 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    For refrigerant numbering and safety-classification context, use the ASHRAE refrigerant-designation resources<\/a>. A refrigerant label alone does not define the complete safety, charge, ventilation, or code strategy for an installation.<\/p>\r\n

    Psychrometric and performance abbreviations<\/h3>\r\n

    Air-coil performance depends on both dry-bulb temperature and moisture condition. A coil RFQ that supplies only room temperature may not contain enough information to predict latent capacity, condensate, or leaving-air condition.<\/p>\r\n

    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    No.<\/th>\r\nSymbol<\/th>\r\n\uc758\ubbf8<\/th>\r\nWhere it appears and what to check<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    81<\/td>\r\nDB<\/td>\r\nDry-bulb temperature<\/td>\r\n\uc99d\ubc1c\uc2dd \uc2b5\uad6c \ud6a8\uacfc \uc5c6\uc774 \uce21\uc815\ud55c \uc77c\ubc18\uc801\uc778 \uae30\uc628\uc785\ub2c8\ub2e4. \uc2b5\ub3c4 \uc815\ubcf4\uc640 \ud568\uaed8 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    82<\/td>\r\nWB<\/td>\r\nWet-bulb temperature<\/td>\r\n\uc99d\ubc1c \ub0c9\uac01\uc758 \uc601\ud5a5\uc744 \ubc1b\ub294 \uc628\ub3c4\uc785\ub2c8\ub2e4. \ud574\ub2f9 \uac12\uc774 \uce21\uc815\uac12\uc778\uc9c0, \uacc4\uc0b0\uac12\uc778\uc9c0 \ub610\ub294 \uc124\uacc4 \uc870\uac74\uc778\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td>\r\n<\/tr>\r\n
    83<\/td>\r\nRH<\/td>\r\nRelative humidity<\/td>\r\n\ub3d9\uc77c\ud55c \uc628\ub3c4\uc5d0\uc11c \ud3ec\ud654 \uc218\uc99d\uae30\uc555\uc5d0 \ub300\ud55c \uc2e4\uc81c \uc218\uc99d\uae30\uc555\uc758 \ube44\uc728\uc785\ub2c8\ub2e4. \uae30\uc628\uc774 \ubcc0\ud560 \ub54c \ud568\uaed8 \ubcc0\ud569\ub2c8\ub2e4.<\/td>\r\n<\/tr>\r\n
    84<\/td>\r\nh<\/td>\r\nSpecific enthalpy<\/td>\r\nEnergy per unit mass used in psychrometric and refrigeration calculations. Do not confuse lowercase h<\/code> with an hour symbol in another context.<\/td>\r\n<\/tr>\r\n
    85<\/td>\r\nW<\/td>\r\nHumidity ratio<\/td>\r\nMass of water vapor per mass of dry air. Some documents use w<\/code>, x<\/code>, or another symbol, so check the chart legend.<\/td>\r\n<\/tr>\r\n
    86<\/td>\r\nSHR<\/td>\r\nSensible heat ratio<\/td>\r\nSensible capacity divided by total capacity. It helps describe how a cooling coil divides temperature and moisture removal.<\/td>\r\n<\/tr>\r\n
    87<\/td>\r\nBF<\/td>\r\nBypass factor<\/td>\r\nA model of the fraction of air that behaves as though it did not reach the coil surface condition. It is tied to coil geometry and airflow.<\/td>\r\n<\/tr>\r\n
    88<\/td>\r\nADP<\/td>\r\nApparatus dew point<\/td>\r\nThe effective coil-surface saturation point found by extending the air-conditioning process line. It is a performance model, not one measured spot.<\/td>\r\n<\/tr>\r\n
    89<\/td>\r\nEAT<\/td>\r\nEntering air temperature<\/td>\r\nAir temperature at the equipment or coil inlet. State dry-bulb plus wet-bulb, RH, or dew point as needed.<\/td>\r\n<\/tr>\r\n
    90<\/td>\r\nLAT<\/td>\r\nLeaving air temperature<\/td>\r\nAir temperature at the equipment or coil outlet. Clarify whether it is coil-off, unit-discharge, or space-supply temperature.<\/td>\r\n<\/tr>\r\n
    91<\/td>\r\nRAT<\/td>\r\nReturn air temperature<\/td>\r\nTemperature of air returning from the served zone. It can differ from the coil entering condition when outdoor air is mixed in.<\/td>\r\n<\/tr>\r\n
    92<\/td>\r\nSAT<\/td>\r\nSupply air temperature<\/td>\r\nTemperature of air delivered by the system. SAT<\/code> may also be read as saturation temperature in refrigeration notes, so check the sheet type.<\/td>\r\n<\/tr>\r\n
    93<\/td>\r\nCOP<\/td>\r\nCoefficient of performance<\/td>\r\nUseful heating or cooling effect divided by energy input on a consistent basis. State the operating condition and included auxiliaries.<\/td>\r\n<\/tr>\r\n
    94<\/td>\r\nEER<\/td>\r\nEnergy efficiency ratio<\/td>\r\nCooling capacity divided by electrical input at a specified rating condition. Do not compare values measured under different conditions.<\/td>\r\n<\/tr>\r\n
    95<\/td>\r\nSEER2<\/td>\r\nSeasonal energy efficiency ratio 2<\/td>\r\nA seasonal cooling-efficiency metric for covered equipment under the applicable test procedure. It is not a single design-point coil rating.<\/td>\r\n<\/tr>\r\n
    96<\/td>\r\nHSPF2<\/td>\r\nHeating seasonal performance factor 2<\/td>\r\nA seasonal heating-efficiency metric for covered heat-pump equipment. Climate and test assumptions differ from a project design point.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    The U.S. Department of Energy explains SEER2 and purchasing requirements for covered central air conditioners<\/a>. For a custom coil, the thermal duty, air and fluid conditions, pressure-drop limits, and cabinet constraints still need to be stated directly.<\/p>\r\n

    Controls, electrical, and point-list abbreviations<\/h3>\r\n

    Controls drawings connect physical equipment to sensors, commands, alarms, and sequences. A point name can be correct while the device range, signal type, or fail action is still missing.<\/p>\r\n

    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    No.<\/th>\r\nSymbol<\/th>\r\n\uc758\ubbf8<\/th>\r\nWhere it appears and what to check<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    97<\/td>\r\nBAS<\/td>\r\nBuilding automation system<\/td>\r\nThe supervisory control system for building equipment. Define required points, network, trends, alarms, and responsibility boundaries.<\/td>\r\n<\/tr>\r\n
    98<\/td>\r\nBMS<\/td>\r\nBuilding management system<\/td>\r\nOften used similarly to BAS, sometimes with broader facility functions. Follow the project’s definition rather than assuming exact equivalence.<\/td>\r\n<\/tr>\r\n
    99<\/td>\r\nDDC<\/td>\r\nDirect digital control<\/td>\r\nDigital control of equipment or systems through programmable controllers. Review sensors, outputs, sequences, and fallback behavior.<\/td>\r\n<\/tr>\r\n
    100<\/td>\r\nPLC<\/td>\r\nProgrammable logic controller<\/td>\r\nAn industrial controller used for machines, skids, or plant processes. Confirm I\/O, communications, program ownership, and safety separation.<\/td>\r\n<\/tr>\r\n
    101<\/td>\r\nVFD<\/td>\r\nVariable-frequency drive<\/td>\r\nControls AC motor speed by varying frequency and voltage. Check motor compatibility, enclosure, bypass, harmonics, and minimum speed.<\/td>\r\n<\/tr>\r\n
    102<\/td>\r\nECM<\/td>\r\n\uc804\uc790 \uc815\ub958\uc2dd \ubaa8\ud130<\/td>\r\nA motor with integrated electronic commutation, common in fans and pumps. Verify control signal, speed range, and programmed behavior.<\/td>\r\n<\/tr>\r\n
    103<\/td>\r\nPID<\/td>\r\nProportional-integral-derivative control<\/td>\r\nA feedback-control method that responds to current, accumulated, and changing error. Tuning depends on the controlled process.<\/td>\r\n<\/tr>\r\n
    104<\/td>\r\nSP<\/td>\r\nSetpoint<\/td>\r\nThe target value for a control loop. SP<\/code> may also mean static pressure, so look at the point name and units.<\/td>\r\n<\/tr>\r\n
    105<\/td>\r\nPV<\/td>\r\nProcess variable<\/td>\r\nThe measured value being controlled or monitored. Confirm sensor location, range, scaling, and units.<\/td>\r\n<\/tr>\r\n
    106<\/td>\r\nAI<\/td>\r\nAnalog input<\/td>\r\nA continuously varying input to a controller, such as temperature or pressure. In other contexts, AI<\/code> may have a different meaning.<\/td>\r\n<\/tr>\r\n
    107<\/td>\r\nAO<\/td>\r\nAnalog output<\/td>\r\nA modulating command from a controller, such as a valve or drive signal. State the signal type and fail response.<\/td>\r\n<\/tr>\r\n
    108<\/td>\r\nDI<\/td>\r\nDigital input<\/td>\r\nA discrete status input, such as proof, alarm, or contact state. Define what open and closed mean.<\/td>\r\n<\/tr>\r\n
    109<\/td>\r\nDO<\/td>\r\nDigital output<\/td>\r\nA discrete command output, such as start, stop, enable, or relay operation. Confirm interlocks and whether the output is maintained or pulsed.<\/td>\r\n<\/tr>\r\n
    110<\/td>\r\nHOA<\/td>\r\nHand-off-auto<\/td>\r\nA selector that permits manual command, disables the command, or returns control to the automatic sequence. Define where each mode is active.<\/td>\r\n<\/tr>\r\n
    111<\/td>\r\nNC<\/td>\r\nNormally closed<\/td>\r\nA contact or valve state under the stated normal condition. The normal condition must be defined as de-energized, unpowered, or another basis.<\/td>\r\n<\/tr>\r\n
    112<\/td>\r\nNO<\/td>\r\nNormally open<\/td>\r\nA contact or valve state under the stated normal condition. Verify fail position separately because normal and fail states are not always identical.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    Unit symbols are not ordinary abbreviations<\/h2>\r\n

    Codes such as AHU<\/code> \ubc0f TXV<\/code> are abbreviations. Symbols such as kPa<\/code>, L\/s<\/code>, \uadf8\ub9ac\uace0 \u00b0C<\/code> represent units. That distinction changes how they should be written.<\/p>\r\n

    \ub2e4\uc74c\uc740 NIST SI style guide<\/a> explains that unit symbols are mathematical entities. They are normally not pluralized, and they are not followed by a period unless they end a sentence. That is why 20 kPa<\/code> is correct while 20 kPas<\/code> is not.<\/p>\r\n

    The same discipline helps in an RFQ. Keep the value and unit together, preserve capitalization, and state whether pressure is gauge or absolute. If a schedule mixes inch-pound and SI values, identify which column controls and check the conversion rather than assuming the displayed values are equivalent.<\/p>\r\n

    Common symbol conflicts that deserve a second look<\/h2>\r\n
    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    Code<\/th>\r\nMeaning 1<\/th>\r\nMeaning 2<\/th>\r\nSafe resolution<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
    HP<\/td>\r\n\ud788\ud2b8 \ud38c\ud504<\/td>\r\nHorsepower<\/td>\r\nCheck whether the code is an equipment tag or a motor rating.<\/td>\r\n<\/tr>\r\n
    CU<\/td>\r\n\uc751\ucd95 \uc720\ub2db<\/td>\r\nControl unit or project-specific tag<\/td>\r\nTrace connected refrigerant piping and match the equipment schedule.<\/td>\r\n<\/tr>\r\n
    RV<\/td>\r\nReversing valve<\/td>\r\nRelief valve<\/td>\r\nReview port count, line location, and component schedule.<\/td>\r\n<\/tr>\r\n
    DP<\/td>\r\nDew point<\/td>\r\nDifferential pressure<\/td>\r\nCheck the units and whether the sheet is psychrometric or controls-focused.<\/td>\r\n<\/tr>\r\n
    SAT<\/td>\r\nSupply air temperature<\/td>\r\nSaturation temperature<\/td>\r\nCheck the point list, refrigerant notes, and associated units.<\/td>\r\n<\/tr>\r\n
    SP<\/td>\r\nSetpoint<\/td>\r\n\uc815\uc555<\/td>\r\nRead the full point name and measurement location.<\/td>\r\n<\/tr>\r\n
    NC<\/td>\r\nNormally closed<\/td>\r\nNo cooling or another local shorthand<\/td>\r\nRead the legend and sequence of operation.<\/td>\r\n<\/tr>\r\n
    OA<\/td>\r\nOutdoor air<\/td>\r\nOverall dimension or local shorthand<\/td>\r\nCheck whether the code sits on ductwork or a fabrication detail.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table><\/div>\r\n

    If a code is still unclear, do not quietly guess. Add a question to the submittal or RFQ, cite the sheet and detail, and ask the responsible party to confirm the intended meaning.<\/p>\r\n

    What to include when a symbol list becomes a coil RFQ<\/h2>\r\n

    \"OEM<\/p>\r\n

    A marked drawing is useful, but a buildable coil inquiry needs more than tags. For a replacement or custom HVAC coil, include the following where applicable:<\/p>\r\n