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Производитель: Carrier Размер: 552.36 kb Название файла: 38ac-2ss.pdf Язык инструкции:

2{°pens (F) 012 890 500 _36 Recip Hermetic; 06DA337 6 10 „ 75 _ Propel 1er 2 1 120 22 % Plate 016 ~oi oses (F) lens (F) oses (F) 5 15_ 65+3 45 ± 3 272 178 60 65 70 75 57 62 *Approximate charge with 25 feet of interconnecting piping Use appropriate charging charts for actual charging of unit tRefrigerant storage capacity at 120 F condensing temperature with condenser 80 percent full of liquid INITIAL START-UP Evacuate and Dehydrate the entire refrigerant system by either of the methods described in Carrier Standard Service Techniques Manual. Leak Test entire refrigerant system by Pressure Method described in Carrier Standard Service Techniques Manual. Use refrigerant specified for unit at approximately 25 psig backed up with an inert gas to a total pressure not to exceed 250 psig. Before Starting Unit, check the following: 1. Compressor oil level must be at least within sight in compressor oil sight glass. Add oil if necessary. 2. Compressor hold-down bolts must be snug but not tight. Refer to installation instructions or tag on compressor foot. 3. All internal wiring connections must be tight; all barriers and covers must be in place. 4. Electrical power source must agree with unit nameplate rating. 5. All service valves must be open. 6. Fan cycling thermostat (head pressure control) sensing bulb must be in air flow under fan no. 1. 7. Crankcase heater must be firmly locked into compressor crankcase. Energize Branch Circuit — Close field disconnect switch to energize compressor crankcase heater. Make sure room thermostat is set in a manner to prevent unit(s) from starting at this time. Heating/Cooling Thermostat (HH03AT064) has an adjustable heat anticipator for both first- and second-stage heating circuits. SETTINGS — Set adjustment lever for first-stage anticipator at 0.24 (left-hand side). Set adjustment lever for second-stage anticipator (right-hand side) as follows: One Strip Heater - 0.21 Two Strip Heaters — 0.42 Three Strip Heaters — 0.63 Outdoor Thermostat — Refer to 40RT strip heater Installation Instructions for details on adjustments of this thermostat (if used). To Start Unit — After compressor crankcase heater has been on for at least 3 hours set room thermostat so unit will start on desired cycle. On initial start of 38AC016, unit should be run for 20 minutes on heating cycle so any contaminants will be collected in larger drier. HEATING — Place thermostat selector to “Heat” and set temperature selector above room ambient. COOLING — Place thermostat selector to “Cool” and set temperature selector below room ambient. To Charge System — Refer to Carrier Standard Service Techniques Manual, Chapter 1, for charging methods and procedures mentioned below. Refer to charging charts as applicable. 1. Be sure to use the correct refrigerant (see charging chart). 2. Regulate refrigerant drum valve to maintain suction pressure at 49 psig on 38AC012 and 80 psig on 38AC016 while charging. ©Carrier Corporation 1969 Form 38AC-2SS DISCHARGE PRESSURE (PSIG) DISCHARGE PRESSURE (PSIG) COOLING CYCLE 290 280 j;:_r 270 260 l>rr 250 240 230 220 210 J-"" 200 - 190 — PT 180 170 ¡à 160 - 150 : 36 38 40 ^ : INDOOR WETi ; ; ; BULB TEMP.; f 64 F ; 67 F . 70F_^ - NOTES: 1 REFRIGERANT 500. : -2 PRESSURES TAKEN ; AT COMPRESSOR. 3 BASED ON NOMINAL : ’ CFM OF 4000 OVER : INDOOR COIL. 42 44 46 48 50 52 54 SUCTION PRESSURE (PSIG) 38AC012 with 40RT012 Indoor Unit 58 60 70 80 SUCTION PRESSURE (PSIG) 38AC016 with 40RT016 Indoor Unit HEATING CYCLE SUCTION PRESSURE (PSIG) 38AC012 with 40RT012 Indoor Unit SUCTION PRESSURE (PSIG) 38AC016 with 40RT016 I ndoor Unit ^Minimum cfm that will allow the unitsto operate at 80 F indoor return air and 65 F wb outdoor air on heating cycle. Higher air quantities increase operating efficiency of system and reduce operating costs Fig. 1 - Charging Charts NOTE: Do not depend on sight glass when charging unit. Use the charging chart. 1 3. Allow system to operate for about 20 minutes. Take temperature and pressure readings and check values with the charging chart. After Charging System, allow unit to run for about 20 minutes. Stop unit and check compressor oil level. Add oil only if necessary to bring oil into view in sight glass. If oil is added, run unit for additional 10 minutes. Stop unit and check oil level. If level is again low, add oil only after determining that piping system is designed for proper oil return and that system is not leaking oil. Check operation of all safety controls. Replace all service panels. Be sure that control panel door is closed tightly. SERVICE Defrost Control, consisting of a defrost timer and a defrost thermostat, interrupts normal system heating operation if ...

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