40
ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
FUEL/AIR MIXER REPLACEMENT:
Refer to Figures 1, 19, 20, and 21 as needed.
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the Header Control Cover (4 screws).
3. Remove the Water Side Top Panel (4 screws).
4. Disconnect the reference pressure hose from the front of the combustion blower assembly.
5. Unlock the fuel/air mixer by turning it 90°
clockwise
. The mixer can be turned by applying torque to the hose barb and the boss feature
across from it. The hose barb should point towards the ground when the mixer is in the unlocked position.
6. Remove the fuel/air mixer by pulling it straight out from the combustion blower inlet.
7. Install new fuel/air mixer by reversing the above steps.
8. Verify that the mixer being inserted is marked with the correct fuel gas and the capacity rating matches that on the rating plate of the heat-
er.
9. Verify manifold pressure after replacing the fuel/air mixer. Instructions for manifold pressure measurements can be found in the
GAS
TESTING
section of this manual on page 31 and following.
NOTICE:
Do not enlarge orifice holes.
NOTICE:
All replacement wiring must be replaced with manufacturers supplied replacement parts.
