Filter
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Fig. # 8069.1
PRESSURE SWITCH ADJUSTMENT RANGE
Fig. # 8152.0
NOTE: If heater is installed outside of the limits shown,
a flow switch must be used in place of the pressure
switch when mounted and wired adjacent to the heater.
Pool or Spa
Heat Exchanger Height
22
PRESSURE SWITCH
The pressure switch, or heater actuator, insures
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. With pump and heater on, turn adjustment
knob (clockwise) until a click is heard from
the gas valve.
2. Turn adjustment knob (counter clockwise)
1/4" turn.
3. Turn pump off and on several times. Heater
should shut off immediately. If it does not,
repeat steps above until proper adjustment
is made.
Adjustment Knob
Heat Exchanger Height
5' Max.
5' Max.
TWO SPEED PUMPS
In some cases, the flow on the low-speed is insuf-
ficient to operate the heater. This is apparent when the
pressure switch cannot be further adjusted or if the
heater makes banging noises. In these cases, the
pump must be run at high speed when heating the
water.
CAUTION: Do not operate the heater without the
functionof a properly adjusted pressure switch.
HIGH LIMITS
The heater is equipped with two automatic high
limits. Set to operate at 135°F and 140°F.
NOTE: An erratic high limit is often characteristic of an
internal heat exchanger problem, i.e. scale buildup,
and U.G. operation. Refer to troubleshooting section.
Fig. # 8153.0
HIGH LIMIT REMOVAL
1. Shut off main electrical power switch to
heater.
2. Remove inspection panels.
3. Drain heater.
4. Remove defective high limit and replace with
a new high limit.
5. Reverse above procedure to re-install.
FLAME ROLL-OUT SAFETY SWITCH
The heater is equipped with a thermal cutoff device
to prevent flame roll-out in the event the heat ex-
changer becomes blocked. This is a "Single-use" type
fusible link or thermal fuse, that must be replaced when
disabled by an over temperature condition, caused by
excessive restriction in the heat exchanger flue pas-
sage.
Fig. #9177