Omega VSHP SERIES, Инструкция по установке и эксплуатации

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OMEGA | WATER SOURCE HEAT PUMPS
OMEGA-VSHP.F-IOM-1907
15 www.omega-heatpump.com
Table 7: Troubleshooting Guide
Problem Mode Possible Cause(s) Correction Method
No response to
any thermostat
setting
Heating/Cooling Main power off Check unit disconnect switch/ circuit breaker/ fuses
Heating/Cooling Defective control transformer Confirm thermostat is wired correctly before replacing
Heating/Cooling Broken or loose connection Check for loose thermostat connections. Repair and/or tighten as required.
Heating/Cooling Defective thermostat
Check and replace
Unit short cycles Heating/Cooling Thermostat improperly located
Relocate thermostat away from supply registers
Only blower runs,
but not compres-
sor
Heating/Cooling Defective compressor overload Check and replace if required (if external)
Heating/Cooling Defective compressor contactor Check and replace if required
Heating/Cooling Supply voltage too low Correct incoming supply voltage setting at Transformer
Heating/Cooling Defective compressor capacitor Check and replace if required
Heating/Cooling Defective compressor windings Check and replace if required
Heating/Cooling Limit switches open
Check for faulty pressure switches. Switches are normally closed. Replace if switches
are open when unit is shutdown.
Heating/Cooling Clogged Drain Pan / Condensate hose /
Faulty Sensor
Condensate switch detects overflow condition in drain pan, check for obstruction. If no
water, check switch, replace if required.
Insufficient
capacity
Heating/Cooling Dirty filter Check and replace
Heating/Cooling Blower RPM too low Set to blower to higher fan speed
Heating/Cooling
Loss of conditioned air due to ductwork
leaks
Check for duct leaks and repair
Heating/Cooling Low on refrigerant charge
Possible leak in system. Check for leaks at piping joints and coil. Repair if possible, and
recharge to unit nameplate charge rating.
Heating/Cooling Defective reversing valve Check and replace
Heating/Cooling Thermostat improperly located Relocate thermostat
Heating/Cooling Inadequate water flow Increase GPM
Cooling Entering Water Temperature too hot Adjust EWT Loop temperature lower
Heating/Cooling Entering Water Temperature too cold Adjust EWT Loop temperature higher
High Pressure
Fault
Cooling Inadequate GPM
If auto shut-off valve is installed, check that control valve actuator opens during call for
Heating. Set valve to manual mode and remove power connections from actuator and re
-
test. If manual mode re-test confirms proper water flow, actuator is likely faulty.
Cooling Water too hot Reduce water loop temperature
Heating Inadequate air flow
Check blower. Typical airflow should be 400 cfm/Ton across air coil. Check for dirty or
obstructed air coil.
Heating Dirty filter Clean/replace
Heating/Cooling Overcharged with refrigerant Decrease charge/Confirm charge matches nameplate.
Heating/Cooling Defective pressure switch
Check or replace
Low Pressure
Fault
Heating/Cooling Undercharged
Possible leak in system. Check for leaks at piping joints and coil. Repair if possible, and
recharge to unit nameplate charge rating.
Cooling
Faulty thermal expansion valve (TXV)
operation
Flooding of refrigerant caused by the TX valve not opening/closing correctly. Check TX
valve bulb has not come loose.
Cooling Inadequate air flow
Check blower. Typical airflow should be 400 cfm/Ton across air coil. Check for dirty or
obstructed air coil
Cooling Dirty filter
Check and replace
Heating Inadequate GPM
Check GPM to unit. If auto-flow reg. valve installed check GPM matches rating of auto-
flow reg. valve.
Heating Inadequate GPM
If auto shut-off valve is installed, check that control valve actuator opens during call for
Heating. Set valve to manual mode and remove power connections from actuator and re
-
test. If manual mode re-test confirms proper water flow, actuator is likely faulty.
Heating Inadequate GPM
Inadequate water flow from riser loop system. Units are nominally rated for 3GPM/Ton.
Check water flow from riser system and confirm capability to provide required GPM to
unit.
Water Loop
Discharge Temp
Alarm
Cooling
Inadequate GPM/Too High Riser Loop
Temperature
Leaving water temperature from water coil exceeds acceptable operating temperature
(127
o
F). Check for clogged or faulty water components, or too low GPM riser supply or
too high entering water temperature.
Water Loop
Supply Temp
Alarm
Heating/Cooling Too High Riser Loop Temperature
Entering water temperature to water coil exceeds acceptable operating temperature
(115
o
F). Lower riser water loop temperature.
Condensate
Overflow Alarm
Cooling Clogged Drain Pan / Condensate hose Condensate switch detects overflow condition in cabinet drain pan. Check for plugged,
obstructed or pinched condensate hose.
Refrigerant
Suction Alarm
Heating/Cooling Suction Temperature sensor defective. Check that sensor is not open or closed. Check for resistance, if reading Zero of Infinity
replace sensor.
Heating/Cooling Suction Temperature below threshold Suction temperature is below 50
o
F in cooling and 70
o
F in heating. Refer to possible
causes under "Low Pressure Fault".