User Manual

Pomona, CA Clemmons, NC Nashville, TN
Tel: [phone] www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
47
To remove the blower vacuum switch:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel. It is secured with (4) screws
3. Remove the wires from the pressure switch.
4. Pull the tubing from the hose barb on the switch.
5. Remove the (2) screws that secure the pressure switch to the control panel.
6. Replace the switch. Reverse steps 1 – 6 to complete the procedure.
HIGH LIMIT SWITCHES:
The high limit is an automatically resetting safety device wired in series with the thermostat and gas
valve. See Figure 45. The heater is equipped with two automatic high limits, located on the water header,
below the outlet water connection.
The limits have the same temperature settings and are interchangeable.
If the water temperature exceeds the limit set point, the gas valve will be closed, shutting off gas supply to
the burners.

 
 
3. Lime scale accumulation in the heat exchanger.
Figure 45: Component locations on header
TO REPLACE A HIGH LIMIT SWITCH:
 
2. Drain the heat exchanger of all water.
3. Unplug the high limit wires from the wiring harness.
4. Unscrew the high limit switch from the header.
5. Replace the high limit switch. Use new sealant on the high
limit switch threads before reinstalling. Reassembly is a
reverse of steps 1 – 4.
Figure 46: High Limit Switch
Figure 45: Component Locations on Header
Heat
Exchanger
Header
Water Pressure
Switch
High Limits (s)
Service
Cartridge
Thermistor