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Page 20
Should adjustment of water pressure switch prove unsuccessful, contact AquaCal AutoPilot
Technical Support; site-specific factors may require the installation of an external flow switch.
"Len Gordon" Switch:
1) Locate black rectangular plastic tab, located on forward-facing side of the switch. See Figure
13. The black rectangle is a wheel lock tab.
2) Slide tab left to unlock the adjustment wheel.
3) With water pump operating and electrical power supplied to the heat pump, slowly rotate top
of adjustment wheel towards you until "FLO" code (just) disappears.
4) Once adjustment has been completed, slide wheel locking tab fully back to right-hand
locked position.
5) With electrical power remaining "ON" and heat pump operating, shut off power to circulating
pump. If switch has been correctly adjusted, heat pump will shut off and "FLO" code will
display when water pump stops.
6) Reinstall heat pump front cover.
"TecMark" Switch:
1) TecMark switches do not have an adjustment wheel lock. See Figure 14.
2) With water pump operating, and electrical power supplied to heat pump, slowly rotate top of
adjustment wheel away from you until "FLO" code (just) disappears.
3) With electrical power remaining "ON" to heat pump and heat pump operating, shut off power
to circulating pump. If switch has been correctly adjusted, when water pump stops, heat
pump will shut off and "FLO" code will display.
4) Reinstall heat pump front cover.
Rotate top of adjustment wheel
TOWARD you to decrease water
pressure required to start heat pump
Tab shown in
un-locked
position
Rotate top of adjustment wheel
AWAY from you to decrease water
pressure required to start heat pump
Figure 13
Figure 14
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