32
ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
GAS TESTING:
GAS LINE TESTING:
The appliance and its gas connection must be leak tested before placing the appliance in operation. The heater must be
isolated from the gas supply 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 flame to check for gas leaks could cause an explosion resulting in
severe injury and/ or death. Shut off gas and fix even the smallest leak right away. Be sure to leak test the heater gas mani-
fold fittings using the above procedure once the heater is in operation.
GAS PRESSURE TESTING:
The following gas pressure requirements are important for the operation of the burners in gas heaters. Improper
gas pressure or gas volume may create the following conditions:
1. Flame burns totally yellow.
2. Flame lift off burner.
3. Heat exchanger soot’s up. The gas pressure regulator on all heaters is preset at the factory, but the setting should be verified by the
installer to ensure proper operation.
NOTICE
:
If inlet gas pressure is inadequate, check for undersize piping between the gas meter and the heater or for a low-capacity gas
meter (see GAS SUPPLY section of this manual).
GAS PRESSURE TEST PROCEDURE
:
Follow the lighting instructions on the unit. Refer to Figure 19: Location of Components for the
location of the gas valve. See Figures 25 and 26 for pressure regulation adjustment for use in this procedure.
1. Obtain the necessary equipment; Qty (2) manometers to read pressure in inches of water column, Qty (2) 1/8”NPT pipe barbed fitting,
Qty (1) barbed tee for use with 3/16” silicon hose, silicon or EPDM hose to fit on barb fittings, 3/16” hex wrench, 7/16” open end wrench,
and medium flat screw driver.
2. Turn off gas supply to heater. Access the gas valve and remove the 1/8” plugs from the gas valve inlet pressure tap and the plug marked
as “pressure” on the outlet side of the valve (see Fig. 26) and install barbed fittings into the tap openings.
3. Remove the factory installed silicon hose from the fitting on the outlet side of the gas valve marked as “vent” (see Fig. 26) and place
hoses, a barbed tee, and a manometer in line with the original hose as shown in Figure 25.
4. Securely connect the hoses and manometers to the barb fittings. Make sure the manometers have ample range and accuracy to proper-
ly read the gas inlet pressure and manifold pressure per Table 11.
5. Turn on gas and water to heater and start the heater following the lighting & operating instructions on the label affixed inside the water
side top panel and in Figure 27. If there is more than one pool/spa heater connected to the gas supply line, turn each of those applianc-
es “ON” while testing the heater.
6. Take pressure readings with the heater running, the pressure values should agree with those in Table 11. If the pressures are within the
stated ranges, then no further adjustment is needed. If the manifold gas pressure does not meet the values in Table 11, the gas valve
regulator must be adjusted. Take note that the target manifold pressure is
NEGATIVE
.
7. To adjust the gas valve regulator perform the following:
a. Remove the screw cap over the regulator adjustment screw (see Figure 26).
b. Turn the inner regulator adjustment screw clockwise to increase pressure and counterclockwise to decrease pressure as required.
c. Replace the screw cap over the regulator adjustment screw.
d. Cycle the heater on/off multiple times and repeat measurements to ensure regulation springs are set.
NOTICE:
If proper pressures 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(s) be provided to within the gas pressure range listed.
8. Turn the gas supply to the heater off and remove the barb fittings. Replace the original 1/8” pipe plugs and connect tubing as shipped
from the factory. Turn on gas and water to heater and start the heater to check for gas leaks.
WARNING:
EXPLOSION HAZARD
Do not remove the measurement tap screws with the valve in the “ON” position and gas
supplied to heater. No gas pressure must be present when the taps are open to atmosphere. Removal of the taps screws or
barb fittings with gas present could cause an explosion resulting in severe injury and/or death.
WARNING:
EXPLOSION HAZARD
Gas pressures in excess of those listed in Table 11 could cause a gas leak or dia-
phragm rupture. Gas leakage could cause an explosion resulting in severe injury or death.
