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Model
LAHP48
Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Section 11: Annual Maintenance
Perform Annual Inspection
Check Glycol/Water Mixture
1.
At least once annually, sample the system fluid to verify that
the glycol concentrations meet the minimum value given in
Figure 13. Also test the inhibitor concentration. Add glycol
and inhibitor as needed to return the system to the correct
concentrations.
2.
Perform any and all other tests as recommended by the anti-
freeze manufacturer’s instructions in order to ensure optimal
performance and maintain warranty protection on all installed
components.
Check Operating Pressure
1.
Check the glycol/water system pressure. Operating pressure
should be between 15 and 25 PSIG. Adjust fluid volume if
needed to restore pressure.
2.
If pressure is low, check system for evidence of leaks. Repair
all leaks immediately. Perform annual inspection
Electrical shock hazard
— Disconnect all electrical
power before proceeding with the following.
Inspection of System
At least once annually, perform a complete inspection of the
system, including at least the following:
• Inspect the LAHP for signs of dirt or debris accumulation.
Remove any debris and notify the building owner that the
unit must be kept clean and unobstructed.
• Inspect glycol/water system piping and components.
Repair or replace any defective components. Repair all
leaks immediately.
• Close the isolation valves on either side of the y-strainer
at the SpacePak heat pump return connection. Remove
the screen and inspect for sediment. Clean if necessary.
NOTE: If the strainer has become clogged with sediment,
determine whether the system needs to be drained,
cleaned and re-filled. Excessive sediment accumulation
in the strainer will reduce flow and cause the unit to shut
down.
• Inspect all wiring and wiring connections. Tighten
connections if needed. Correct any problems found.
• Check the fuses or breakers to ensure they are correctly
sized and properly installed.
• Clean the LAHP heat exchangers and air openings.
• Cycle the system on heating and cooling. Verify that all
components operate correctly.
Preparing The LAHP For Shut Down
DO NOT turn off power to the LAHP in the winter or any time
when there is a possibility of freezing. Power must be ON for the
automatic anti-freeze operation to occur. See information below
for preparing the unit for shut down.
1.
When the water temperature drops below 34°F during periods
of non-use, the pump will start and the anti-freeze heater
(optional, when installed) will energize and continue to operate
until the temperature reaches 38°F.
2.
If the LAHP must be turned off or left idle during periods when
freezing is possible, one of the following must be done:
a. Verify that sufficient glycol solution is present to protect
against most extreme anticipate conditions
b. — OR — Drain heat pump and external piping completely.
To restart after shutdown
1. If unit was drained, refill.
2. Follow start up procedure in Section 8.
