Carrier RHS, RVS, RDS006-060, RVR Refrigerant Charging, Air Coil Fan Motor Removal, Troubleshooting

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Refrigerant Charging

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 atmosphere. Remove and reclaim refrigerant following accepted practices.

Air Coil Fan Motor Removal

Before attempting to remove fan motors or motor mounts, place a piece of plywood over evaporator coils to prevent coil damage.

Disconnect motor power wires from motor terminals before motor is removed from unit.

1.Shut off unit main power supply.

2.Loosen bolts on mounting bracket so that fan belt can be removed.

3.Loosen and remove the 2 motor mounting bracket bolts on left side of bracket.

TROUBLESHOOTING

(Fig. 31 and 32, and Table 30)

When troubleshooting problems with a WSHP, consider the following.

Thermistor — A thermistor may be required for single- phase units where starting the unit is a problem due to low voltage. See Fig. 31 for thermistor nominal resistance.

		90.0
		80.0
		70.0
	(kOhm)	60.0
	(kOhm)	50.0
	Resistance	50.0
	Resistance	40.0

30.0

20.0

10.0

0.0

0.020.0 40.0 60.0 80.0 100.0 120.0 140.0

Temperature (degF)

Fig. 31 — Thermistor Nominal Resistance

4.Slide motor/bracket assembly to extreme right and lift out through space between fan scroll and side frame. Rest motor on a high platform such as a step ladder. Do not allow motor to hang by its power wires.

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. 32.

	AIR
AIRFLOW	COIL	AIRFLOW
AIRFLOW		AIRFLOW
(°F)		(°F)
a50-8163
THERMISTOR
			EXPANSION	COAX
			VALVE
		FP2	FP1
CONDENSATE
	OVERFLOW		LIQUID
	(CO)		LIQUID
	(CO)		LINE	WATER IN	WATER OUT
LEGEND			LINE
		AIR COIL
		AIR COIL	WATER
COAX — Coaxial Heat Exchanger		FREEZE	WATER
COAX — Coaxial Heat Exchanger		FREEZE	COIL
Airflow		PROTECTION	COIL
Airflow			PROTECTION

Refrigerant Liquid Line Flow

SUCTION

COMPRESSOR

DISCHARGE

Fig. 32 — FP1 and FP2 Thermistor Location

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Contents Contents Safety ConsiderationsInstallation GeneralPage Physical Data Aquazone 50RHC,RVC006-060 Units PSC FAN Motor and BlowerPhysical Data Aquazone 50RHS,RVS,RDS015-070 Units Physical Data Aquazone 50RHR,RVR006-060 UnitsPermanent Split Capacitor Code Return Discharge Airflow ConfigurationRight Ext Power Cond Therm Supply Return Depth Height Out Pump Supply Ensate015-024 030Back Right Right BackTypical Installation 50RHC,RHR,RHS Units Top Right TopConfiguration Top View-Left Return Configuration Left Return Left ViewIsometric ViewConfiguration Left Return Left View Air Coil Opening Isometric ViewCode Front ViewHt Return/Bottom Discharge Return/Bottom Discharge Isometric ViewTop View Front-ViewRemove Screws Side DischargeRotate Move to SideMounting the Unit 50RHC Units50RHR Units 50RHS UnitsCondensate Drain Horizontal Unit PitchCondition Acceptable Level Field Power Supply Wiring Field Control WiringLOC BMCNEC ComprTypical Aquazone Deluxe D Control Wiring RVSLON HpwsTrans A50-8154 Low Voltage Field Wiring 50RHC,RVC Electrical Data RLA LRA Motor Unit Circuit FUSE/HACRFLA RLA50RHR,RVR VOLTS-PHASE Voltage Compressor FAN Total MIN MAX 50RHR,RVR Electrical DataUnit Circuit Units RLA LRA FUSE/HACRPRE-START-UP 50RDS, RHS, RVS Electrical Data50RHR,RVR Rated MIN FAN 50RHR,RVR Blower PerformanceSpeed 50RHC,RVC Blower Performance 50RVC Blower Performance with Hot Water Reheat HWR OptionReheat External Static Pressure ESP Loss Coil Face Velocity 50RHC,RVC Rated MIN FAN50RVC Blower Performance with Wet Coil 50RHS,RVS,RDS Blower PerformanceCoil Face Velocity WET Coil Reduction 50RHS,RVS,RDS Rated FANControl Jumper Settings See Fig Field Selectable Inputs50RHS, RVS Blower Performance with HWR Coil Face 50RHS, RVS with Reheat ESP LossDIP Switch Block S2 Accessory 1 Relay Options DIP Switch Block S2 Accessory 2 Relay OptionsHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings Accessory DIP Switch Position Relay OptionsControl Accessory Relay Configurations START-UPHWR Operating Modes OutputUnit Start-Up Cooling Mode Water Temperature Change Through Heat ExchangerOperating Limits Operating Limits 50RHC,RVC UnitsUnit Start-Up Heating Mode Typical Unit Operating Pressures and TemperaturesEntering Cooling Heating Water GPM Temp F TON50RHS,RVS,RDS Coaxial Water Pressure Drop 50RHR,RVR Coaxial Water Pressure Drop50RHC,RVC Coaxial Water Pressure Drop Approximate Fluid Volume gal Per 100 Ft of Pipe Antifreeze Percentages by VolumeOperation Units with Aquazone Complete C ControlUnits with HWR Option Complete C Control LED Code Fault DescriptionsSystem Test Aquazone Deluxe D Control LED Indica ServiceESD Gravity Flow Method Refrigerant Charging TroubleshootingAir Coil Fan Motor Removal Troubleshooting Fault Heating Cooling Possible Cause SolutionUnit Does Not Operate 50RHC,RVC,RHR,RHS,RVR,RVS,RDS START-UP Checklist II. START-UPHeating Cycle Analysis Cooling Cycle Analysis