Water Pressure Switch Adjustment - Pentair ULTRATEMP 70 Guía De Instalación Y Usuario

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Water Pressure Switch Adjustment

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 flow 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. 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 [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
flow 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 fitting 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 flow is above the minimum requirement of 30
gpm (110 lpm) after the directional fitting installation.
Be 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:
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 flow through the heat pump. Start the filter
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 filter
pump. The heat pump should turn off immediately.
4. If the heat pump continues to operate when the filter
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.
ULTRATEMP Heat Pump Installation and User' s Guide
®
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 light turns ON, and the heat pump stops.
7. Check the setting of the water pressure switch by
starting and stopping the filter pump and checking
the control panel and operation of the heater between
each flow change.
8. If the water pressure switch cannot be adjusted to
accommodate the conditions listed above, an external
flow switch must be added to the plumbing system
to ensure that the heat pump will not operate without
the proper flow 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 flow through the heat pump. Start the
filter 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 light is present then the water
pressure switch needs to be adjusted.
4. Remove the UltraTemp
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 light vanish, time delay countdown will
start.
6. Once the heat pump is running, turn off the filter
pump. The heat pump should turn off immediately.
7. If the heat pump continues to operate when the
filter 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 light turns ON, and the
heat pump stops.
8. Check the setting of the water pressure switch by
starting and stopping the filter pump and checking
the control panel and operation of the heater
between each flow change.
9. If the water pressure switch cannot be adjusted
to accommodate the conditions listed above,
an external flow switch must be added to the
plumbing system to ensure that the heat pump will
not operate without the proper flow through the
heat exchanger.
Heat Pump's left front
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