Installation Guide

Pomona, CA Clemmons, NC Nashville, TN
Tel: [phone] www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
32
If gas pressure is inadequate, check for undersize piping between the gas meter and the heater or for a
low-capacity gas meter.
GAS PRESSURE TEST PROCEDURE:
Refer to gure 26 for the location components used in this procedue on the specic model of UHS heater be-
ing serviced.
GAS LINE TESTING:
The appliance and its gas connection must be leak tested before placing the appliance in operation. The
heater and its individual shutoff valve must be disconnected from the gas supply during any pressure testing
of that system at test pressure in excess of ½ psig (3.45 kPa). The heater must be isolated from the gas sup-
ply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply
piping system at test pressure equal to or less than ½ psig (3.45 kPa).
Gas supply line must be capped when not connected. After pressure testing, reconnect the gas piping to the
gas valve. Turn gas supply “ON” and test all pipe and tubing joints for leaks. Use a soap and water solution.
WARNING: EXPLOSIVE HAZARD. The use of an open ame to check for gas
leaks could cause an explosion resulting in severe injury and/ or death.
Shut off gas and x even the smallest leak r ight away. Be sure to leak test the heater
gas manifold ttings using the above procedure once the heater is in operation.
GAS PRESSURE TESTING:
The following gas pressure requirements are important to the proper operation of the burners in
gas heaters. Improper gas pressure or gas volume will create the following conditions:
1. Flame burns totally yellow.
2. Flame lifts off burner.
3. Heat exchanger soots up. The gas pressure regulator on all heaters is preset at the factory,
but the setting should be veried by the installer to ensure proper operation.
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