Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-355-7995 www.hayward-pool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
22
8. Gas pressure regulator adjustment procedure:
a. Remove the screw cap over the regulator
adjustment screw (see Figure 1616).
b. Turn the regulator adjustment screw
clockwise to increase pressure and coun-
terclockwise to decrease pressure.
c. Replace the screw cap over the regulator
adjustment screw.
WARNING EXPLOSION HAZARD:
Do not remove the 1/8” pipe nipple with the
valve in the ON position. The valve must be in the OFF position when the nipple is
removed. Removal of the nipple with the gas valve ON could cause an explosion result-
ing in severe injury and/or death.
9. Remove the 1/8” pipe nipple and replace the 1/8” pipe plug. If proper pressure cannot be achieved
by adjusting the gas valve regulator, the installer must contact the gas supplier and request that the
inlet pressure to the heater be set to within the gas pressure range shown in Table 6.
WARNING EXPLOSION HAZARD:
Gas pressures in excess of those listed in
Table 6 coul
d cause a gas leak or diaphragm rupture. Gas leakage could cause an
explosion resulting in severe injury or death.
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 may require adjustment to compensate for the change
in static head pressure. The following procedure is recommended when the switch needs adjustment and/or is replaced:
For Installations with Heater Above Water Level:
1. Be sure the
fi
lter is clean before making the adjustment.
2. Turn “ON” the
fi
lter pump and ensure all air is out of the water lines, and ensure water
fl
ow rate is at
least the rated minimum (see Table 5).
3. Turn “ON” the heater and adjust the thermostat to create a call for heat.
4. 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.
5. Check the function of the pressure switch by turning the
fi
lter pump on and off several times. The pool
heater should turn off immediately when the pump is turned off. Never allow the heater to operate with
less than the minimum rated water
fl
ow rate.
Table 6: Correct gas pressures
Pressure, in. w.c.
H1351D1,
ABG1351
H1351DP1,
ABG135P1
Fuel
Natural
Propane
Manifold
1.8” - 2.0” w.c. 6.8” - 7.0” w.c.
Inlet, minimum
4.5” w.c.
10.0” w.c.
Inlet, maximum
10.5” w.c.
13.0” w.c.