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The pressure switch is preset at the factory for
activation at 2 psi (14 kPa). This is the minimum
setting for the water pressure switch and works for
all basic installations as shown previously in Section
3.1 and Section 3.5 in this manual. Only adjust the
water pressure switch if the heat pump does not
operate when the proper flow is applied to unit or if
the heat pump does not shut off when the filter pump
is off. Occasionally, unusual plumbing configurations
or necessary restrictions in the plumbing may cause
pressure sensing problems. In these rare situations, the
plumbing system configuration may require adjustment
of the water pressure switch.
Adjustment of the pressure switch may be
necessary if any part of the filter system piping is 3 feet
(1 m) or more above the top of the heat pump jacket.
Do not adjust the pressure switch if the heat pump
is installed more than 11 feet (3,5 m) above or 5 feet
(1,5 m) below the pool surface. Consult your local
Jandy dealer for recommendations.
On some installations, the piping from the heat
pump to the pool is very short. The back pressure
could be too low to trigger the pressure switch. If this
happens, it may be necessary to install a directional
fitting or elbows where the return line enters the
pool. This will increase back pressure enough for the
heat pump to operate properly. If this configuration
is necessary, be sure to check that the system flow is
above the minimum requirement of 30 gpm after the
direction fitting or elbow has been installed.
Make sure the pool filter is clean before making
any pressure switch adjustment: A dirty filter will
restrict the water flow and the pressure switch cannot be
adjusted properly.
To adjust the pressure switch:
1. Be sure that all valves in the system are set to
allow water fl ow through the heat pump. Start the
fi lter pump.
2. Set the heat pump control to call for heat. Set the
heat pump control to the POOL HEAT mode.
3. If the heat pump control displays “NO FLOW”,
then the fl ow in the system may be below the
minimum fl ow of 30 gpm needed for the safe
operation of the heat pump. Investigate and correct
any fl ow problems before adjusting the water
pressure switch.
4. Remove the heat pump’s control access panel. The
water pressure switch is located in the lower left
corner of the control compartment.
5. After confi rming the fl ow rate is at a minimum
of 30 gpm, slowly rotate the thumb wheel on
the water pressure switch in a counterclockwise
direction until the “NO FLOW” indicator
disappears from the control display. Remember
that there is a time delay before the heat pump
compressor will start.
6. Once the heat pump is running, turn off the fi lter
pump. The heat pump should turn off immediately.
7. If the heat pump continues to operate when the
fi lter pump is off, turn the thumb wheel on the
water pressure switch in a clockwise direction
until “NO FLOW” is displayed on the control and
the heat pump shuts down.
8. Check the setting of the water pressure switch by
starting and stopping the fi lter pump and checking
the control display and operation of the heater
between each fl ow change.
9. If the water pressure switch cannot be adjusted
to accommodate the conditions listed above,
an external fl ow switch must be added to the
plumbing system to ensure that the heat pump will
not operate without the proper fl ow through the
heat exchanger.
Test Recommended Level
Free Chlorine or 1.0 to 3.0 ppm (3.0 to 5.0 spa)
Bromine 2.0 to 4.0 ppm (3.0 to 5.0 spa)
pH 7.4 to 7.6
Total Alkalinity (TA) 80 to 120 ppm
Calcium Hardness (CH) 200 to 400 ppm
Cyanuric Acid 30 to 50 ppm
Total Dissolved Solids (TDS) Less than 2000 ppm
Copper 0 ppm
* Concentration levels taken from “Basic Pool and Spa Technology” published by APSP (Association of Pool and
Spa Professionals).
Table 3. Optimal Water Chemistry Ranges
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