Carrier RVS, RDS006-060, RVR, RHR, RVC, RHS, 50RHC specifications Unit Does Not Operate

Page 42

Table 30 — Troubleshooting (cont)

FAULT

HEATING

COOLING

POSSIBLE CAUSE

SOLUTION

Only Compressor Runs

X

X

Thermostat wiring

Check G wiring at heat pump. Jumper G and R for fan operation.

 

X

X

Fan motor relay

Jumper G and R for fan operation. Check for line voltage across BR

 

 

 

 

contacts.

 

 

 

 

Check fan power enable relay operation (if present).

 

X

X

Fan motor

Check for line voltage at motor. Check capacitor.

 

X

X

Thermostat wiring

Check Y and W wiring at heat pump. Jumper Y and R for compressor

 

 

 

 

operation in test mode.

Unit Does Not Operate in

 

X

Reversing valve

Set for cooling demand and check 24 VAC on RV coil and at control.

Cooling

 

 

 

 

 

 

 

If RV is stuck, run high pressure up by reducing water flow and while

 

 

 

 

 

 

 

 

operating engage and disengage RV coil voltage to push valve.

 

 

X

Thermostat setup

Check for 'O' RV setup not 'B'.

 

 

X

Thermostat wiring

Check O wiring at heat pump. Check RV to ensure the valve is chang-

 

 

 

 

ing over from heating and cooling modes. A 'click' should be heard

 

 

 

 

when the RV changes modes.

Insufficient Capacity/

X

X

Dirty filter

Replace or clean.

Not Cooling or Heating

 

 

 

 

X

 

Reduced or no airflow in

Check for dirty air filter and clean or replace.

Properly

 

 

 

heating

 

 

 

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

 

 

 

External static too high. Check blower Tables 8-13.

 

 

X

Reduced or no airflow in

Check for dirty air filter and clean or replace.

 

 

 

cooling

 

 

 

 

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

External static too high. Check blower Tables 8-13.

 

X

X

Leaky ductwork

Check supply and return air temperatures at the unit and at distant duct

 

 

 

 

registers if significantly different, duct leaks are present.

 

X

X

Low refrigerant charge

Check superheat and subcooling Table 21.

 

X

X

Restricted metering device

Check superheat and subcooling Table 21. Replace.

 

 

X

Defective reversing valve

Manually check the four-way valve to ensure all valves are operational.

 

X

X

Thermostat improperly

Check location and for air drafts behind thermostat.

 

 

 

located

 

 

X

X

Unit undersized

Recheck loads and sizing check sensible cooling load and heat pump

 

 

 

 

capacity.

 

X

X

Scaling in water heat

Check for scale (water deposits) and clean if necessary.

 

 

 

exchanger

 

 

X

X

Inlet water too hot or cold

Check load, loop sizing, loop backfill, ground moisture.

High Head Pressure

X

 

Reduced or no airflow in

Check for dirty air filter and clean or replace.

 

 

 

heating

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

External static too high. Check blower Tables 8-13.

 

 

X

Reduced or no water flow in

Check pump operation or valve operation/setting.

 

 

 

cooling

 

 

 

 

Check water flow adjust to proper flow rate. See Table 20.

 

 

 

 

 

 

X

Inlet water too hot

Check load, loop sizing, loop backfill, ground moisture.

 

X

 

Air temperature out of range

Bring return air temperature within design parameters.

 

 

 

in heating

 

 

 

X

Scaling in water heat

Check for scale (water deposits) and clean if necessary.

 

 

 

exchanger

 

 

X

X

Unit overcharged

Check superheat and subcooling. Reweigh in charge.

 

X

X

Non-condensables in

Evacuate the refrigerant, recharge the system, and then weigh the new

 

 

 

system

refrigerant charge.

 

X

X

Restricted metering device

Check superheat and subcooling per Table 21. Replace.

Low Suction Pressure

X

 

Reduced water flow in

Check pump operation or water valve operation/setting.

 

 

 

heating

Plugged strainer or filter. Clean or replace.

 

 

 

 

 

 

 

 

Check water flow adjust to proper flow rate.

 

X

 

Water temperature out of

Bring water temperature within design parameters.

 

 

 

range

 

 

 

X

Reduced airflow in cooling

Check for dirty air filter and clean or replace.

 

 

 

 

Check fan motor operation and airflow restrictions.

 

 

 

 

External static too high. Check blower Tables 8-13.

 

 

X

Air temperature out of range

Too much cold vent air. Bring entering air temperature within design

 

 

 

 

parameters.

 

X

X

Insufficient charge

Check for refrigerant leaks.

Low Discharge Air

X

 

Too high airflow

Check blower Tables 8-13.

Temperature in Heating

X

 

Poor performance

See 'Insufficient Capacity'.

High Humidity

 

X

Too high airflow

Check blower Tables 8-13.

 

 

X

Unit oversized

Recheck loads and sizing check sensible cooling load and heat pump

 

 

 

 

capacity.

LEGEND

 

 

 

 

RV — Reversing Valve

 

 

 

 

Copyright 2007 Carrier Corporation

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book

1

4

Catalog No. 04-53500007-01 Printed in U.S.A.

Form 50R-5SI

Pg 42

6-07

Replaces: 50R-4SI

Tab

5a

5a

 

 

 

 

 

 

 

 

 

 

 

 

 

Image 42
Contents Contents Safety ConsiderationsInstallation GeneralPage Physical Data Aquazone 50RHC,RVC006-060 Units PSC FAN Motor and BlowerPhysical Data Aquazone 50RHR,RVR006-060 Units Physical Data Aquazone 50RHS,RVS,RDS015-070 UnitsPermanent Split Capacitor Airflow Configuration Code Return DischargeRight 015-024 Ext Power Cond Therm Supply ReturnDepth Height Out Pump Supply Ensate 030Back Right Right BackTypical Installation 50RHC,RHR,RHS Units Top Right TopIsometric Configuration Top View-Left ReturnConfiguration Left Return Left View ViewCode Configuration Left Return Left View Air Coil OpeningIsometric View Front ViewTop View Ht Return/Bottom DischargeReturn/Bottom Discharge Isometric View Front-ViewRotate Remove ScrewsSide Discharge Move to Side50RHR Units Mounting the Unit50RHC Units 50RHS UnitsCondensate Drain Horizontal Unit PitchCondition Acceptable Level Field Power Supply Wiring Field Control WiringNEC LOCBMC ComprTypical Aquazone Deluxe D Control Wiring RVSHpws LONTrans A50-8154 Low Voltage Field Wiring FLA 50RHC,RVC Electrical DataRLA LRA Motor Unit Circuit FUSE/HACR RLAUnit Circuit Units 50RHR,RVR VOLTS-PHASE Voltage Compressor FAN Total MIN MAX50RHR,RVR Electrical Data RLA LRA FUSE/HACRPRE-START-UP 50RDS, RHS, RVS Electrical Data50RHR,RVR Blower Performance 50RHR,RVR Rated MIN FANSpeed Reheat External Static Pressure ESP Loss Coil Face Velocity 50RHC,RVC Blower Performance50RVC Blower Performance with Hot Water Reheat HWR Option 50RHC,RVC Rated MIN FANCoil Face Velocity WET Coil Reduction 50RVC Blower Performance with Wet Coil50RHS,RVS,RDS Blower Performance 50RHS,RVS,RDS Rated FAN50RHS, RVS Blower Performance with HWR Control Jumper Settings See FigField Selectable Inputs Coil Face 50RHS, RVS with Reheat ESP LossHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings DIP Switch Block S2 Accessory 1 Relay OptionsDIP Switch Block S2 Accessory 2 Relay Options Accessory DIP Switch Position Relay OptionsHWR Operating Modes Control Accessory Relay ConfigurationsSTART-UP OutputOperating Limits Unit Start-Up Cooling ModeWater Temperature Change Through Heat Exchanger Operating Limits 50RHC,RVC UnitsEntering Cooling Heating Water GPM Unit Start-Up Heating ModeTypical Unit Operating Pressures and Temperatures Temp F TON50RHR,RVR Coaxial Water Pressure Drop 50RHS,RVS,RDS Coaxial Water Pressure Drop50RHC,RVC Coaxial Water Pressure Drop Operation Approximate Fluid Volume gal Per 100 Ft of PipeAntifreeze Percentages by Volume Units with Aquazone Complete C ControlComplete C Control LED Code Fault Descriptions Units with HWR OptionSystem Test Service Aquazone Deluxe D Control LED IndicaESD Gravity Flow Method Troubleshooting Refrigerant ChargingAir 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