PRESSURE SWITCH
The pressure switch, or heater actuator, insures that the heater operates only when the filter pump is in operation. It is located on the inlet/outlet header. 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
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 adjustments made.
Adjustment
Knob
Fig. #2008
PRESSURE SWITCH ADJUSTMENT RANGE
FLAME ROLL-OUT SAFETY SWITCH
The heater is equipped with a thermal cutoff device to prevent flame
Fig. #9177
HIGH LIMITS
The heater is equipped with two automatic high limits. Both are located in the inlet/outlet header. Both are set to open at 135°F.
NOTE: An erratic high limit is often characteristic of internal heat exchanger problem, i.e. scale buildup, defective bypass. Refer to troubleshooting sections.
Fig. # 2009
HEAT EXCHANGER HEIGHT
5' Max
5' Max
Fig. # 8152.0s
HIGH LIMIT REMOVAL
1.Shut off main electrical power switch to heater.
2.Remove inlet/outlet inspection panel.
3.Remove defective high limit and replace with a new high limit.
4.Replace inspection panel.
PILOT SAFETY (Millivolt)
NOTE: If heater is installed outside of the limits shown, a flow switch mounted and wired adjacent to the heater must be used in place of the pressure switch.
TWO SPEED PUMPS
In some cases, the flow on the low speed is insufficient to operate the heater. This is apparent when the pressure switch cannot be further adjusted or if the heater makes banging noises or goes off on high limit. In these cases, the pump must be run at high speed when heating the water.
CAUTION: Do not operate the heater without the func- tion of a properly adjusted pressure switch or flow switch.
The heaters equipped with the standing pilot (milli- volt system), have pilot generators which act as a safety device to shut off the flow of gas to the main burners and the pilot burner in case the pilot flame is extinguished. The pilot burner must be manually relighted to place the heater in operation again. Refer to the lighting instruc- tions provided on the heater label.
PILOT SAFETY (Electronic)
The heater employs a pilot safety which closes the main gas valve within 8/10ths of a second whenever the pilot flame is interrupted. Pilot flame is automatically lit when the device is powered. Unit performs its own safety check and opens the main valve only after the pilot is proven to be lit.
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