Hayward Universal H-Series Low NOx Service/Installation: H150FDN H200FDN H25 - Page 46

Ignition Control Board, Display Board And Keypad, Blower Vacuum Switch

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46 Ignition control board: The ignition control board features an integral thermostat and uses special technology and software for optimum performance of a silicon nitride igniter element. See Figure 42. To remove the ignition control board: 1. Turn pump, gas supply, and heater power "OFF". Figure 43: Display board and keypad: 2. Remove the front access panel. It is secured with (4) screws. Remove the control box cover. It is secured with (2) screws. 3. Disconnect all wires from the ignition control board. 4. Detach the board from the sheet metal panel. 5. Replace the ignition control board. Reassembly is the reversal of steps 1 - 5. Display board and keypad: The display board and keypad provide the user interface with the heater. See Figure 43. The replacement part is only available as an assembly. To remove the display board and keypad assembly: 1. Turn pump, gas supply, and heater power "OFF". 2. Remove the front access panel. It is secured with (4) screws 3. Remove the control box cover. It is secured with (2) screws. 4. Unplug the display connector from the ignition control board. 5. Remove the (2) screws along the lower edge of the bezel that retain the assembly. 6. Pull the assembly forward and then lift it out. 7. Replace the assembly. Reverse steps 1 - 6 to complete the procedure Blower vacuum switch: The blower vacuum switch is a safety device that prevents the ignition sequence from continuing unless the blower is developing sufficient airflow for combustion. See Figure 44. When the blower achieves sufficient airflow, the negative pressure created in the blower housing closes the contacts on the blower vacuum switch. This indicates to the ignition control board that it is safe to continue the ignition sequence. The tubing on the blower vacuum switch should be attached to the blower housing pressure tap that faces the front of the heater. Figure 44: Blower vacuum switch USE ONLY HAYWARD GENUINE REPLACEMENT PARTS Pomona, CA Clemmons, NC Nashville, TN Tel: 908-351-5400 www.haywardpool.com

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Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
46
IGNITION CONTROL BOARD:
The ignition control board features an integral thermostat and uses special technology and software for
optimum performance of a silicon nitride igniter element. See Figure 42. To remove the ignition control
board:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel. It is secured with
(4) screws. Remove the control box cover. It is
secured with (2) screws.
3. Disconnect all wires from the ignition control
board.
4. Detach the board from the sheet metal panel.
5. Replace the ignition control board. Reassembly is
the reversal of steps 1 – 5.
DISPLAy BOARD AND KEyPAD:
The display board and keypad provide the user in-
terface with the heater. See Figure 43. The replacement part is only available as an assembly. To remove the
display board and keypad assembly:
1. Turn pump, gas supply, and heater power “OFF”.
2.
Remove the front access panel. It is secured with (4) screws
3.
Remove the control box cover. It is secured with (2) screws.
4.
Unplug the display connector from the ignition control board.
5.
Remove the (2) screws along the lower edge of the bezel that retain the assembly.
6.
Pull the assembly forward and then lift it out.
7.
Replace the assembly. Reverse steps 1 – 6 to complete the procedure
BLOWER VACUUM SWITCH:
The blower vacuum switch is a safety device that
prevents the ignition sequence from continuing unless
the blower is developing sufficient airflow for combus-
tion. See Figure 44. When the blower achieves sufficient
airflow, the negative pressure created in the blower
housing closes the contacts on the blower vacuum
switch. This indicates to the ignition control board that
it is safe to continue the ignition sequence.
The tubing on the blower vacuum switch should be
attached to the blower housing pressure tap that faces
the front of the heater.
Figure 43:
Display board and keypad:
Figure 44:
Blower vacuum switch