Filter
Top Products
TEMPERATURE CONTROL
The pool water temperature is controlled by the pool
thermostat.
The heater water temperature high limit is controlled by
the manual reset high limit.
PRESSURE SWITCH
The pressure switch, or heater actuator, ensures that
the heater operates only when the filter pump is in
operation. It is factory set at 1.75 PSI for deck level
installations. When the heater is located below the level
of the spa or pool, it may be necessary to reset the
pressure switch to compensate for the no-flow static
head. If it is necessary to reset the pressure switch, we
recommend the following procedure:
PRESSURE SWITCH ADJUSTMENT:
1. Make sure the pool filter is clean before adjusting
the switch.
2. Set the heater control to the OFF mode.
3. Turn the filter pump on and confirm that the pressure
switch is closed (use a multimeter to check). If the
pressure switch fails to close, either the switch
setting is too high or the filter pump is not supplying
enough pressure.
4. Turn the heater ON.
5. Manually turn the pressure adjustment knob clock-
wise until the heater shuts off. (A flat screw driver may
be necessary if knob is too tight).
6. Slowly turn the adjustment knob counter-clockwise
until the heater calls for heat again.
7. Turn an additional 1/2 turn counter-clockwise.
8. While the heater is running, check the adjustment by
turning the pump off and on several times. The
burners should shut off immediately when the pump
is turned off. If it does not, repeat the above steps until
proper operation is observed.
20
MODELS 2100-4001
SECTION 4/ SERVICING INSTRUCTIONS
GENERAL LOCATION OF CONTROLS
MODELS 926-1826
Inlet/Outlet Pressure
Header Switch
Unitherm Electrical
Governor Conn.
Hi-limit
control/
Temp. Control Main Burner Gas Valve
Inlet/Outlet
Header w/Bypass
Pump
Electrical
Connection
Main Burner
Gas ValveManual On/Off Valve
Fig. #9261.1