16
UltraTemp
®
Heat Pump Installation and User’s Guide
Water Pressure Switch Adjustment
CAUTION
—
The water pressure switch should be adjusted to turn the heater off when the pump is off. Setting the switch
to close at too low of a fl ow can damage the appliance. Adjust the switch to turn the heater off, not on.
The pressure switch is preset at the factory for activation at 1.5 psi [10 kPa]. This factory setting works for most basic
installations as shown previously on
pages 7, 9-10
in this manual. Only adjust the water pressure switch if the heat pump
does not operate
when the proper fl ow is applied to unit
or if the heat pump does not shut off when the fi lter pump is
off. Occasionally, unusual plumbing confi gurations or necessary restrictions in the plumbing may cause pressure sensing
problems. In these rare situations, the plumbing system confi guration may require adjustment of the water pressure switch.
Adjustment of the pressure switch may be necessary if any part of the fi lter system piping is 3 feet [0.91 m] or more above
the top of the heat pump.
In general, if the heat pump is installed more than 6 feet [1.83 m] below the pool surface, an external water fl ow switch must
be added to the plumbing system.
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, install a directional fi tting or elbow where the return line enters the pool. This
will increase back pressure for the heat pump to operate properly. Be sure to check that the system fl ow is above the minimum
requirement of 30 gpm (110 lpm) after the directional fi tting installation.
Be sure the pool fi lter is clean before making any pressure switch adjustment: A dirty fi lter will restrict the water fl ow and
the pressure switch cannot be adjusted properly.
To adjust the pressure switch:
The following adjustment is for installations where the heat pump is below pool water level.
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 temperature above the actual temperature to call for heat. Turn the heat Pump
ON
.
3. Once the heat pump is running, turn off the fi lter pump. The heat pump should turn off immediately.
4. If the heat pump continues to operate when the fi lter pump is off, then the water pressure switch needs to be adjusted.
5. Remove the heat pump’s left front panel and remove remaining right front panel. The water pressure switch is located
in the water plumbing in the lower right corner of the heat pump.
6. Slowly rotate the adjustment wheel on the water pressure switch in a
clockwise
direction until the
“LOW WATER
FLOW”
Alarm shows on the LCD, the Red Service LED turns
ON
, and the heat pump stops.
7. Check the setting of the water pressure switch by starting and stopping the fi lter pump and checking the control panel
and operation of the heater between each fl ow change.
8. 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.
The following adjustment is for installations where the heat pump is above pool water level.
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 temperature above the actual temperature to call for heat. Turn the heat Pump
ON
.
3. If the LCD shows a “
LOW WATER FLOW
” Alarm and Red Service LED is present then the water pressure switch
needs to be adjusted.
4. Remove the heat pump’s left front panel and remove remaining right front panel. The water pressure switch is located
in the water plumbing in the lower right corner of the heat pump.
5. Slowly rotate the adjustment wheel on the water pressure switch in a
counterclockwise
direction until the “
LOW
WATER FLOW
” Alarm and Red Service LED vanish, time delay countdown 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 adjustment wheel on the water pressure
switch in a
clockwise
direction until the “
LOW WATER FLOW
” Alarm shows on the LCD, the Red Service LED
turns
ON
, and the heat pump stops.
8. Check the setting of the water pressure switch by starting and stopping the fi lter pump and checking the control panel
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.