Rev. B 1-22-04 P/N 472235
25
SAFETY CONTROLS
AIR PRESSURE PROVING SWITCH
The air pressure switch is a safety device used to insure
that the blower (fan) is operating and has been designed
to monitor the vacuum (negative) pressure within the
blower housing. The air pressures switch is factory
set and is in the ignition module circuit—the ignition
module does not operate unless the air pressure switch
and all safety switches are closed.
Basic Operation
Adjustment Knob
Typical Water Pressure Switch
Figure 20.
WATER PRESSURE SWITCH
The water pressure safety switch closes when there is
a sufficient flow of water to the heat exchanger to
safely operate the heater. The switch operation must
be verified during initial operation of the heater after
installation—the switch is set at 1 PSIG and the switch
contacts must not be closed in the absence of water
flow. NOTE: See, Below Pool Level Installation
instructions on page 14. The switch may remain closed
with no water flow if there is more than a 3 ft. elevation
difference between the heater (heat exchanger) and
the pool water line—if this is the case, the water
pressure switch must be reset to maintain open switch
contacts with no water flow.
NOTE
If the pool is more than one floor above or one floor
below the heater, the pressure switch may have to
be replaced with a flow switch.
THERMAL FUSE:
This is a single-use switch, mounted on combustion
chamber jacket divider (inner front panel). The fuse
is activated by excessive temperature due to abnormal
operating conditions. Upon detection of excessive heat
within the inner front panel, the fuse will open the
safety circuit causing shutdown of the heater.
AIR PRESSURE SWITCH
Figure 19.
Air Pressure Switch
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