Carrier 50PSW036-360 specifications Refrigerant Charging, Troubleshooting

Page 19

but take care to prevent liquid from being carried over by the gases.

Warm solution acts faster, but cold solution is just as effec- tive if applied for a longer period.

GRAVITY FLOW METHOD — Do not add solution faster than vent can exhaust the generated gases.

When condenser is full, allow solution to remain overnight, then drain condenser and flush with clean water. Follow acid manufacturer’s instructions. See Fig. 12.

3.After unit conditions have stabilized, read head pressure on discharge line gage.

NOTE: Operate unit a minimum of 15 minutes before checking charge. From standard field-supplied Pressure- Temperature chart for R-410A, find equivalent saturated condensing temperature.

4.Read liquid line temperature on thermometer; then subtract from saturated condensing temperature. The dif- ference equals subcooling temperature.

Refrigerant Charging

FILL CONDENSER WITH CLEANING SOLUTION. DO NOT ADD SOLUTION MORE RAPIDLY THAN VENT CAN EXHAUST GASES CAUSED BY CHEMICAL ACTION.

VENT

PIPE

1.0 TO 1.2 m

PAIL

FUNNEL

1-IN.

(25 mm)

PIPE

1.5 m APPROX

CONDENSER

WARNING

To prevent personal injury, wear safety glasses and gloves when handling refrigerant. Do not overcharge system — this can cause compressor flooding.

NOTE: Do not vent or depressurize unit refrigerant to atmo- sphere. Remove and recover refrigerant following accepted practices.

TROUBLESHOOTING

When troubleshooting problems with a WSHP, refer to Table 13.

Thermistor — A thermistor may be required for single- phase units where starting the unit is a problem due to low voltage. See Fig. 14 for thermistor nominal resistance.

PAIL

Fig. 12 — Gravity Flow Method

FORCED CIRCULATION METHOD — Fully open vent pipe when filling condenser. The vent may be closed when condenser is full and pump is operating. See Fig. 13.

Control Sensors — The control system employs 2 nom- inal 10,000 ohm thermistors (FP1 and FP2) that are used for freeze protection. Be sure FP1 is located in the discharge fluid and FP2 is located in the air discharge. See Fig. 15.

90.0

80.0

70.0

PUMP PRIMING CONN.

SUCTION

PUMP

SUPPORT

GAS VENT

GLOBE

VALVES

SUPPLY

1-IN.

(25 mm)

PIPE

CONDENSER

(kOhm)

60.0

50.0

 

istance

40.0

30.0

Res

20.0

 

 

10.0

TANK

FINE MESH SCREEN

REMOVE WATER

REGULATING VALVE

RETURN

0.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-17.7

-6.6

4.4

15.6

26.7

37.8

48.9

60.0

 

 

 

 

Temperature (C)

 

 

 

Fig. 14 — Thermistor Nominal Resistance

Fig. 13 — Forced Circulation Method

Regulate flow to condenser with a supply line valve. If pump is a nonoverloading type, the valve may be fully closed while pump is running.

For average scale deposit, allow solution to remain in con- denser overnight. For heavy scale deposit, allow 24 hours. Drain condenser and flush with clean water. Follow acid manu- facturer’s instructions.

Checking System Charge — Units are shipped with full operating charge. If recharging is necessary:

1.Insert thermometer bulb in insulating rubber sleeve on liquid line near filter drier. Use a digital thermometer for all temperature measurements. DO NOT use a mercury or dial-type thermometer.

2.Connect pressure gage to discharge line near compressor.

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Contents Safety Considerations ContentsGeneral Installation50PSW Unit Physical Data HWG Unit Size Electric Access PlugsOverall Cabinet 50PSW50PSW180,360 Unit Teflon* tape thread sealant is recommended to minimize Condition Closed Open Loop and Recirculating Well Water Quality GuidelinesRECIRCULATING† 50PSW Electrical Data Wire Electrical ConnectionsMIN/MAX RLA LRA QTY FLA LED FP1FP2 JW1Hpws AstatComp DTSJumper Wire for Alarm Field Low Voltage Wiring Alarm Relay Contacts Motor SwitchCompressor Field Wiring Terminal Block Compressor Contactor Hot Water Generator Field Line Voltage WiringTypical Aquazone 50PSW360 Deluxe D Control Wiring, 3-Phase PRE-START-UP Wire Low Voltage ConnectionsAccessory DIP Switch Position Relay Options Complete C Control Jumper Settings See FigDeluxe D Control Jumper Settings See Fig DIP Switch Block S2 Accessory 1 Relay OptionsUnit Start-Up DIP Switch Block S2 Accessory 2 Relay OptionsSTART-UP Operating Limits See TableUnit Size Heat Exchanger Pressure DropSystem Test OperationUnits with Aquazone Complete C Control Units with Aquazone Deluxe D ControlAquazone Deluxe D Control LED Indica Complete C Control LED Code Fault DescriptionsLED Status Description Alarm Relay Operation LED Fault Description CodeDescription Status LED Test LED ServiceESD Refrigerant Charging TroubleshootingFP1 and FP2 Thermistor Location Fault Heating Cooling Possible Cause Solution TroubleshootingCopyright 2010 Carrier Corporation II. START-UP 50PSW START-UP ChecklistHTG Heating and Cooling Cycle AnalysisDescription Heating Cooling CLG

50PSW036-360 specifications

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