Carrier 50RTP03-20 specifications Troubleshooting, FP1 and FP2 Thermistor Location

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TROUBLESHOOTING

When troubleshooting problems with a WSHP, consider the cuases and solutions in Table 21.

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

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. 25.

AIRFLOW

(°F)

THERMISTOR

AIR

COIL

AIRFLOW

(°F)

EXPANSION

VALVE

FP2FP1

COAX

SUCTION

COMPRESSOR

DISCHARGE

	CONDENSATE
	CONDENSATE
	OVERFLOW	LIQUID
	OVERFLOW
	(CO)
	(CO)	LINE	WATER IN		WATER OUT
		LINE
	AIR COIL
	AIR COIL	WATER
	FREEZE	WATER
	PROTECTION	COIL
		PROTECTION

LEGEND

COAX — Coaxial Heat Exchanger

Airflow

Refrigerant Liquid Line Flow

Fig. 25 — FP1 and FP2 Thermistor Location

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Contents Safety Considerations ContentsGeneral InstallationPhysical Data Aquazone 50RTP03-20 Units In/Out FPT Drain 03,04 12.57 x DimensionsOutside Air Water Condensate 18.95 x 11/4 10,12 11/2 In/Out FPT14,20 18.95 x 50RTP14,20 Unit Dimensions78.875 82.25 21.00 25.00 19.00 82.875 76.875 27.00 86.25 Return Air Transition Supply Air Transition Exterior50 RTP Install Condensate DrainWater Quality Guidelines Connect Electrical WiringFLA Hacr Electrical Data50RTP03 Blower Performance Data 50RTP04 Blower Performance Data 50RTP05 Blower Performance Data 50RTP06 Blower Performance Data 50RTP08 Blower Performance Data 4000 38003900 4200 50RTP10 Blower Performance Data4100 4600 43004400 450050RTP12 Blower Performance Data 6200 50RTP14 Blower Performance Data7000 64006600 680050RTP20 Blower Performance Data Rpm 940 956 976 996 1016 1036 1056 1076 1092 Turns Open 10,000ECR See legend and notes on 50RTP08-20 Units 50RTP03-06 UnitsHpwr A50-8557 Sizes Typical Control Wiring with Deluxe D and LON ControllerAL1 J6J5J1 J8 A50 Units with Deluxe D and Wshp Open Multiple Protocol Controls Wshp Open Control Deluxe D Connect Low Voltage WiringCompressor-Stage Reversing Valve Fan 24Vac Hot 24Vac ComField Selectable Inputs Complete C Control Jumper Settings SeeDeluxe D Control Jumper Settings See PRE-START-UPDIP Switch Block S2 Accessory 2 Relay Options DIP Switch Block S2 Accessory 1 Relay OptionsOperating Limits Unit Start-Up Cooling ModeUnit Start-Up Heating Mode START-UPBACview6 Display Interface Unit Start-Up with Wshp Open ControlsPage Units with Aquazone Deluxe D Control Antifreeze Percentages by VolumeOperation Units with Aquazone Complete C ControlPage Auxiliary Modulating Hot Water/Steam Heating Reheat System Test Complete C Control LED Code Fault Descriptions Aquazone Deluxe D Control LED Indica Service’ to 4’ Refrigerant ChargingAir Coil Fan Motor Removal Replacing the Wshp Open Controller’s BatFP1 and FP2 Thermistor Location TroubleshootingOvercharged with refrigerant TroubleshootingAir temperature out of range Reduced or no water flowUnit Does Not Operate Sensor Appendix a Wshp Open Screen ConfigurationAlarm Status StatusConfiguration Appendix a Wshp Open Screen ConfigurationMaintenance System SettingsSchedule Test Appendix a Wshp Screen Open ConfigurationService Electronically Commutated Motor Configuration ServiceAlarm Page Page Copyright 2010 Carrier Corporation II. START-UP 50RTP START-UP ChecklistCatalog No Form 50RTP-1SI Pg CL-2 10A Replaces New Heating Cycle AnalysisCooling Cycle Analysis Along Dotted Line