Adjusting Water Flow Using Δt (Delta-T) - Aquacal HeatWave SuperQuiet SQ175 Operation Manual

If water flow through the heat pump is reduced, performance will suffer and internal safety devices may
deactivate the heat pump with error codes HP and HP5, or (if equipped) an LP and LP5.
Operate water filtration devices per manufacturer's specifications. Dirty filters can cause reduced water flow to the
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heat pump. An increase of 7-10 psi higher than the clean filter pressure typically reduces flow rates. This requires
the filter to be cleaned or back-washed
Keep baskets free of debris. Similar to a dirty filter, large volumes of debris in the pump and skimmer baskets can
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reduce water flow.
Check for improper valve settings. A partially closed valve after the filter, or a full-open bypass around the heat
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pump, will cause insufficient water flow through the heat pump.
The maximum static (or operating pressure) is 50 pounds-per-square-inch (PSI). These specifications relate to the
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heat pump only. Code-specified whole system turnover rates must be satisfied.
4.1.c Adjusting Water Flow Using ΔT (Delta-T)
The Delta-T is the temperature difference between the water temperatures entering and leaving the heat
pump. The equipment can be fine-tuned for maximum performance by balancing water flow rates to
maintain an ideal ∆T.
Installed Temperature / Pressure probes and ports are required to perform the following procedures.
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This adjustment procedure is to be completed with the unit in HEA mode only ; ACH and COO discharge
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temperatures are not shown.
PLEASE NOTE -
Temperature / Pressure ports are required for all commercial applications.
They are strongly recommended (but not required) for residential installations.
1. Adjust heat pump thermostat to its lowest setting while in
HEA mode.
2. Deactivate the water filtration pump.
3. Adjust valves to a halfway open position leading to the
heat pump.
4. Adjust valves to a fully open position leading away from
the heat pump.
5. Activate the pool water filtration pump.
6. Slowly turn the thermostat up until the heat pump
activates.
After a four-minute delay, the heat pump
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compressor will start.
7. With the heat pump running, confirm water filtration
pump is operating properly with adequate flow and no
short cycling. If needed, clean filters leading to the heat
pump.
8. Wait for water and refrigerant pressure to stabilize (approximately 5 minutes).
9. Adjust valves in the following order:
A. Adjust valve leading away from the heat pump to correct temperatures measured with a temperature
pressure probe.
B. Allow pressure to stabilize . Then check temperature again. Re-adjust valve leading away from the
heat pump as needed.
10. Mark valves at these positions for future reference.
Temperature differences are based on pool temperatures of 72° (+ or – 3° F). For water
temperatures outside this range, contact AquaCal
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Temperature / Pressure Port
(Shown with Probe)
® Technical Support.