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Maintenance Procedures
Table 10. Recommended heat pump service intervals
Visually inspect the heat pump
Log pressure and temperatures
Inspect touchscreen interface panel for alarm history
Clean strainers on the inlet water pipe
Check the compressor oil level sight glass
Confirm the glycol concentration
Confirm the refrigeration pressures
Check the refrigeration liquid line sight glass
Inspect refrigerant pressures and temperature set points
Inspect superheat (10 °F to 12 °F [5°C to 6°C]) and sub-cooling temperatures (10°F to 15°F [5°C to 8°C])
Inspect the load heat exchanger entering and leaving evaporator temperature
Collect water/glycol mixture sample for analysis
Inspect crankcase heaters
Inspect piping for signs of leaks
Inspect refrigerant piping for oil or refrigerant leaks
Observe refrigeration operating pressures
Confirm motor amperage draw and voltage
Confirm heat pump superheat and sub-cooling
Check for worn or burned contactors
Inspect all electrical connections and fuses
Inspect each compressor for refrigerant pressures, overheating, oil leaks
Inspect compressor terminals for pitting, corrosion, and loose connections
Inspect compressor oil level
Confirm and record compressor amperage draw and voltage
Compare water/glycol flow against design specifications
Weekly
Weekly inspection is a continuation and elaboration of daily
best practice:
•
Inspect touchscreen interface panel for alarm status
and additions to the alarm history. (Do not clear alarms
as this is a very important performance record if
troubleshooting problems occur.)
•
Listen for excessive vibrations or motor noise. This
usually signals a loose brace or section of piping.
•
Measure all refrigerant static pressure on any idle
circuits. Record any significant changes or reductions
in pressure.
•
Clean strainers weekly during initial weeks after initial
start up until water quality has been reliably
established. Thereafter, inspect and clean strainers at
least monthly .
48
Task
Monthly
The monthly maintenance inspection examines many items
that generally require frequent attention. This routine event
identifies small problems early before they can become big
problems requiring serious repair and refurbishment:
1. Remove the strainer on the inlet water pipe to the heat
pump and verify that it is clean and free of debris.
2. Clean the strainer's mesh screen by back-washing with
high water velocity. If fine particles cannot be removed
with the water stream, use a mild detergent and a non-
abrasive brush to remove them.
3. Check the compressor oil level sight glass. The oil
should always be clear and free-flowing. Any milky or
"slow rolling" effect indicates that liquid refrigerant is
making its way back into the compressor and will cause
premature compressor failure.
Frequency
Daily
Daily
Weekly
Monthly
Monthly
Monthly
Monthly
Monthly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Annually
Annually
Annually
Annually
Annually
Annually
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