24
SERVICING
General Location Of Controls
Models 926-1826
Models 2100-4001
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 on Models
926-1223 equipped with a Unitherm Governor,
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 pres-
sure 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-clock-
wise 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.
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Pressure
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Switch
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Electrical
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Conn.
Hi-limit
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Fig. 28: General Location of Controls
(Models 926-1826)
Inlet/Outlet
Header w/Bypass
Pump
Electrical
Connection
Main Burner
Gas Valve
Manual On/Off Valve
Fig. 29: General Location of Controls
(Models 2100-4001)
