Adjusting Water Pressure Switch (Select Units) - Aquacal SQ120R Instruction Manual

2.2 Adjusting Water Pressure Switch (Select Units)

Adjust the water pressure switch when heat pump attempts to operate without water flow.
Before attempting any adjustments confirm the following :
The filter is clean.
l
Filter pump is operating.
l
The valves are set to direct the appropriate amount of water through the
l
heat pump. See "Water Flow Rates" on page 6.
" FLO" is displayed (or displays intermittently).
l
DANGER
Deactivate power while routing wiring to control board.
l
Follow all National Electric Codes (NEC) and/or State and Local guidelines.
l
WARNING
Water Pressure Switch adjustment procedure to be performed by experienced service personnel only; procedure
l
must not be attempted by individuals lacking adequate electrical and mechanical experience.
NOTICE
If the heat pump continues to operate after a water pressure switch adjustment, deactivate equipment and
l
perform additional troubleshooting.
1. Remove heat pump access panel.
2. Locate the water pressure switch. It will be outside and
along the bottom edge of the electrical enclosure. The exact
location varies by model.
3. Activate the filter pump.
4. Apply power to heat pump.
5. Slowly rotate the adjustment wheel on the switch. Keep
turning the wheel until the heat pump indicates it is
receiving water. The display will no longer indicate " FLO".
6. Deactivate filter pump. If correctly adjusted, the heat pump
will deactivate and the display will show " FLO".
7. Re-install heat pump access panel.
8. If the heat pump continues to operate without water flow, the installation of a grid flow switch may be required.
This can become necessary if the heat pump is installed below the elevation of the body of water to be heated or
l
cooled. The standing pressure from the water can cause the water pressure switch to activate when the circulation
pump is off. Therefore a water flow switch must be used in place of a water pressure switch to determine if incoming
water is being sent to the heat pump. See "Grid Flow Switch (# 0040S)" on the next page.
9. If the heat pump continues to operate without water flow, contact AquaCal
Failure to heed the following will result in injury or death.
Failure to heed the following may result in injury or death.
Failure to heed the following may result in damage to equipment.
® .
Page - 18