Installation Guide

Pomona, CA Clemmons, NC Nashville, TN
Tel: [phone] www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
45
IGNITION CONTROL SYSTEM:
The ignition control system in this heater consists of 3 printed circuit boards (the ignition control board,
the display board, and the fuse board) and a keypad. The locations of these components are shown in Figure
31. The ignition control system functions as the heater’s thermostat, safety control system, and controller for
the gas combustion system.
To remove/replace the ignition control board or the fuse board:
1. Turn pump, gas supply, and heater power OFF.
2. Remove the front access panel.
3. Disconnect all wires from the printed circuit board.
4. Detach the board from the sheet metal panel by compressing the plastic stand-offs.
5. Replace the board, and reverse the above steps to reassemble.
To remove/replace the display board or keypad:
1. Turn pump, gas supply, and heater power OFF.
2. Remove the front access panel.
3. Unplug the display board ribbon cable from the ignition control board.
4. Remove the 4 screws and remove the plastic bezel & keypad assembly from the sheet metal panel on
the front of the heater.
5. The display board is attached to the back side of the bezel & keypad assembly. Unplug the keypad
ribbon cable from the display board.
6. Detach the board from the plastic bezel by removing the 2 small screws.
7. Replace the display board or bezel & keypad assembly, and reverse the above steps to reassemble.
BLOWER VACUUM SWITCH:
The blower vacuum switch is a safety device that prevents the ignition sequence from continuing unless
the blower is developing sufcient airow for combustion. Figure 31 shows the location of the blower vacu-
um switch in the heater cabinet. When the blower achieves sufcient airow, the negative pressure created in
the blower housing closes the contacts on the blower vacuum switch, indicating to the ignition control board
that it is safe to continue the ignition sequence. A silicone tube connects the blower vacuum switch with the
blower as shown in Figure 31.
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. Reverse the above procedure to install the blower vacuum switch.