Installation Guide

Pomona, CA Clemmons, NC Nashville, TN
Tel: [phone] www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
33
Figure 26: Gas Valves
INCREASE
PRESSURE
DECREASE
PRESSURE
For all valves, adjust regulator pressure
by removing the screw cap and turning
the adjustment screw as shown below.
ON/OFF
knob
Inlet
pressure
tap plug
Manifold
pressure
tap plug
Electrical
terminals
Regulator
adjustmernt
screw under
this screw
cap
Valve for H150FD, H200FD,
H250FD, H300FD, H350FD,
and H400FD models
ON/OFF
knob
Inlet
pressure
tap plug
Electrical
terminals
Regulator
adjustmernt
screw under
this screw
cap
Valve for H500FDN model
Manifold pressure to be taken at the pressure tap located on
the gas manifold just after the gas valve for H500FDN units.
ON/OFF
switch
Inlet
pressure
tap plug
Manifold
pressure
tap plug
Electrical
terminals
Regulator
adjustmernt
screw under
this screw
cap
Valve for H500FDP model
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 resulting in severe injury and/or death.
1. Obtain the necessary equipment:
a. Manometer to read pressure in inches of water column
b. 1/8” pipe nipple (1/8” thread x 1” long)
c. 3/16” hex wrench
d. Flat screwdriver
2. Remove the 1/8” plug from the gas valve.
3. Install the 1/8” pipe nipple into the gas valve.
4. Attach the manometer to the pipe nipple.
5. Turn on the water system and start the heater following the lighting & operating instructions on the label
afxed inside the front access panel. If there is more than one pool/spa heater connected to the gas supply
line, turn each of those appliances “ON” while testing the heater.
6. Take a pressure reading with the heater running, the value should agree with those in Table 15. If the pres-
sure is within the range of 1.8” - 2.0” w.c. (natural) or 6.8” - 7.0” w.c. (propane), then no further adjustment
is needed.
7. If the gas pressure does not meet the above requirements the regulator must be adjusted.
8. Gas pressure regulator adjustment procedure:
a. Remove the screw cap over the regulator adjustment screw (see Figure 26).
b. Turn the regulator adjustment screw clockwise to increase pressure and counterclockwise to decrease
pressure.
c. Replace the screw cap over the regulator adjustment screw.
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 re-
quest that the inlet pressure to the heater be set to within the gas pressure range shown in Table
15.
WARNING EXPLOSION HAZARD: Gas pressures in excess of those listed in Fig.
33 could cause a gas leak or diaphragm rupture. Gas leakage could cause an explosion
resulting in severe injury or death.
Table 15: Correct gas pressures
Pressure, in. w.c.
FDN FDP
Fuel
Natural Propane
Manifold
1.8” - 2.0” w.c. 6.8” - 7.0” w.c.
Inlet, minimum
4.5” w.c. 9.0” w.c.
Inlet, maximum
10.5” w.c. 13.0” w.c.