Solar Installations; Water Pressure Switch Adjustment - Pentair ULTRATEMP ETi 220 Installation And User Manual

10

Solar Installations

The UltraTemp ETi™ Hybrid Heater can be used in
combination with other heating schemes such as solar. All
heat sources must be plumbed in series to work correctly
and efficiently.
A recommended plumbing layout for a heater-solar
combination heating system for a pool / spa combination
is shown below (Figure 14). Your system may not contain
all of these components, but the basic plumbing will apply
by eliminating the component in the illustration that is not a
part of your system.
Note: Water temperatures produced by supplemental
heating sources, such as solar, are not regulated or
controlled by the heater and may exceed the maximum
temperature allowed.
POOL
RETURN
SPA
MAKE-UP
CHECK
POOL
VALVE
INTAKE
SPA FILTER
RETURN
POOL
DRAIN A
S
SPA
SPA
DRAIN
INTAKE
Turn star wheel clockwise to raise
pressure set point
Turn star wheel counterclockwise to
lower pressure set point
ULTRATEMP ETI™ Hybrid Heater Installation and User's Guide
CHECK
VALVE
FROM SOLAR
TO SOLAR
Figure 14
PUMP
Heater-Solar Layout
Figure 15
Water Pressure
Switch
Star Wheel
A reference scale is on
the back of pressure switch

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 6 psi [41.4 kPa]. This factory setting works for most
basic installations. Only adjust the water pressure switch
if the heater does not operate when the proper flow is
applied to unit or if the heater 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 heater.
In general, if the heater 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 heater 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 heater 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
heater is below pool water level.
1. Be sure that all valves in the system are set to allow
water flow through the heater. Start the filter pump.
2. Set the heater temperature above the actual temperature
to call for heat. Turn the heater ON.
3. Once the heater is running, turn off the filter pump. The
heater should turn off immediately.
4. If the heater continues to operate when the filter pump is
off, then the water pressure switch needs to be adjusted.
5. Remove the heater's left front panel and remove
remaining right front panel. The water pressure switch
is located in the water plumbing in the lower corner of
the heater.
6. Slowly rotate the adjustment wheel on the water pressure
switch in a counterclockwise direction until the "LOW
WATER FLOW" Alarm shows on the LCD, the red
SERVICE light turns ON, and the heater stops. See
Figure 15.