35
ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
WATER PRESSURE SWITCH TEST / ADJUSTMENT PROCEDURE:
The pressure switch is preset at the factory for most typical deck level installations. When the heater is located above or below the level of the
pool or spa, the pressure switch will require adjustment to compensate for the change in static pressure. The following procedure is recom-
mended when the switch needs adjustment and/or is replaced:
1. Be sure the filter is clean before making any adjustment.
2. Turn “ON” the filter pump and ensure all air is out of the water lines, and ensure
water flow rate is at least the rated minimum (see SPECIFICATION SECTION).
3. Turn “ON” the heater and adjust the temperature control to create a call for heat.
4. For Installations with Heater above water level: If the heater does not light, adjust
the pressure switch by turning the adjustment knob on the pressure switch counter-
clockwise until the heater lights. Turning the adjustment knob counterclockwise
decreases the pressure needed to close the switch (see Figure 27).
5. For Installations with Heater below water level: Turn the adjustment knob on the
pressure switch clockwise, until the heater turns off, then turn the knob ¼ turn coun-
ter-clockwise, so that the heater turns back on. Turning the adjustment knob clock-
wise increases the pressure needed to close the switch.
6. Check the function of the pressure switch by turning the filter pump on and off sev-
eral times and confirming that the heater turns off immediately when the pump is
turned off. Never allow the heater to operate with less than the minimum rated wa-
ter flow rate.
Figure 28: Water Pressure Switch
TWO- OR VARIABLE-SPEED PUMPS:
In some cases the pressure from lower speed settings are below the 1-pound minimum required to
operate the water pressure switch on the heater. This is apparent when the pressure switch cannot be further adjusted. In these cases the
pump must be run at high speed to operate the heater. If the pump and piping arrangement are such that the required 1-pound minimum pres-
sure cannot be obtained, do not attempt to operate the heater. Correct the installation.
NOTICE:
Heater installation, checkout, and start-up should now be completed. BE SURE to leave this manual with the pool owner.