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If water flow through the heat pump is reduced, internal safety devices will shut off the heat pump (i.e.:
"HP", "HP5", "LP" or "LP5"). Maintain equipment as outlined below to prevent water flow issues:
Operate water filtration devices per manufacturer's specifications. Dirty filters can cause reduced
water flow to the heat pump. The higher the pressure on the filter gauge, the lower the flow rate.
Keep baskets free of debris. Similar to a dirty filter, large volumes of debris in the pump and
skimmer baskets can reduce water flow.
Check for improper valve settings. A partially closed valve after the filter, or a full-open bypass
around the heat pump, will cause insufficient water flow through heat pump.
The maximum static (or operating pressure) is 50 pounds-per-square-inch (PSI). These
specifications relate to the heat pump only. Code-specified whole system turnover rates must be
satisfied.
3.1.c Adjusting Water Flow using ∆T (Delta-T)
The ∆t is the difference in water temperatures going in and out of the heat pump. The equipment can be
fine-tuned for maximum performance by balancing water flow rates to maintain an ideal ∆T. Please note
the following adjustment procedure is to be completed with unit in "HEA" mode only; "ACH" and "COO"
discharge temperatures are not shown.
1) Turn heat pump thermostat to its lowest setting while in "HEA" mode.
2) Turn off water pump.
3) Turn valves leading to heater to half-way open positions.
4) Turn valves leading away from heater to wide-open positions.
5) Turn on pool water pump.
6) Slowly turn up heat pump thermostat until heat pump turns on.
The source water pump will cycle on first.
After a four minute delay, the heat pump compressor will start.
7) With the heater running, confirm the source-
side water pump is operating properly with
adequate flow and no short cycling. If
needed, clean filters leading to heat pump.
8) Wait for water and refrigerant flows to
stabilize (approximately 5 minutes).
9) Adjust both source-side and pool-side valves
leading away from heater to correct
temperatures (measured with supplied
temperature pressure probe). See Table 9
for correct temperatures. Temperature
differences are based on source water
temperatures of 72° (+ or – 3° F). For source
temps outside this range contact AquaCal
AutoPilot Customer Support.
Probe inserted into port when measuring water
temperature to and from the heat pump
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