Initial Star- -Up Of Hrp System - Carrier GC Series Installation Instructions Manual

INITIAL START- -UP OF HRP SYSTEM
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
Make sure all valves in heat recovery water piping system
are open. NEVER OPERATE HR PUMP DRY.
1. Turn on the heat pump. The HR pump should not run if the
compressor is not running.
2. Turn HR switch to the "ON" position. The pump will oper-
ate if entering water temperature to HR is below 140_F
(60_C) and compressor discharge temp is above 120_F
(48.9_C) .
3. The temperature difference between the water entering and
leaving the heat recovery should be 5_F to 15_F (- -15_C to
- -9.4_C).
4. Allow the unit to operate for 20 to 30 minutes to ensure it is
functioning properly.
Problem
NO FLOW No Power
LOW FLOW
On/Off Switch Position
Compressor Contactor
Broken or loose wires
Air Lock
Stuck pump shaft/impeller
Defective pump
Kinked or under sized water piping
HIGH WATER
Water temp limit closed
TEMPERATURE
LOW HEAT OUTPUT Scaled or fouled heat exchanger
HRP Troubleshooting
The HR pump will be enabled when compressor discharge
temperature is 120_F (48.9_C)or above.
The circulating pump will be disabled if water temperature reaches
140_F (60_C) or amperage exceeds 0.4 amps.
HRP Troubleshooting
Possible Cause
32
Checks and Corrections
Check power supply
Set switch to "ON" position
Engage heat pump contactor
Repair or tighten wires
Purge air from piping system
Remove pump cartridge and clean
Replace pump
Repair kink and check for proper line size
Stuck limit switch
Sensor not attached securely to line
Clean heat exchanger