Hayward Universal H-Series Service/Installation: H150FDN H200FDN H250FDN H300F - Page 34

Gas Pressure Testing

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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: 34 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 WARNING: EXPL2.OdRS.eImFVolvaEtestchHreew1A/d8Zr"ivpAelruRg fDrom. Tthhe egaus vsaelvoe.f an open flame to check for gas leaks could cause an3. eIxnsptallol sthieo1n/8r"epsipuelntiipnpgle iinntostheevgearsevailnvej.ury and/ or death. Shut off gas and fix45e.. vATeutntranctohhntehthesemmwaanatoelmrleseytsestrtetlmoetaahnekdpsriptaeirgtnthihpteplhaee.watearyfo. lBloweinsgutrhee ltigohtlinega&k otpeesrtatitnhgeinhsteruacttieorns on the gas manifold fittings ulsabinelgaffithxeed ainbsiodevtehepfrroonct aecdceussrepaonenl.cIef thtehree ishmeaorteetrhainsoinne poopole/srpaathieoante.r 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 Figure 33. If the pressure is within the range of 1.8" - 2.0" w.c. (natural) or 6.8" - 7.0" w.c. (propane), then no GAS PRESSURE TESTING: further adjustment is needed. 7. If the gas pressure does not meet the above requirements the regulator must be adjusted. The following gas pressure requirement8s. gas heaters. Improper gas pressure or gas aGabv..raoeslRTpuiuermermmnssopteuvhoreeewrtrrhteeiaegglunsullclatacrtetotroworeracaadtadthjpjueuesosttvtmmhpeereernntohttfpespocrerrleoerlgcwoueodlwcaupltoroieecrn:kragwadtjiuscieosottmnoneidonnitcftrsiectoarhseneewsp(b:rseeusesruFnrieeguarnrsed3icn2o)u.nterclockwise to de- 1. Flame burns totally yellow. 2. Flame lifts off burner. crease pressure. c. Replace the screw cap over the regulator adjustment screw. 3. Heat exchanger soots up. The gas pressure regulatoWr AoRnNaINllG hEeXaPtLeOrSsIOisNpHrAesZeAtRaDt: tDhoenoftarcemtoorvye,the 1/8" pipe nipple with but the setting should be verified by the installer totheenvsaulvreeinptrhoe "pOeNr"opposeitrioant.ioThne.valve must be in the "OFF" position when the nipple is removed. Removal of the nipple with the gas valve "on" could cause an If gas pressure is inadequate, check for undersize pipinegxpbloestiownereesnulttinhgeingsaevserme ienjtuerry aannd/dortdheeathh. eater or for a low-capacity gas meter. Gas pressure test procedure: 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 Figure 26: Gas valve Inlet pressure tap plug Regulator adjustment screw under this screw cap d. Flat screwdriver 2. Remove the 1/8" plug from the gas valve. 3. Install the 1/8" pipe nipple into the gas valve. ON/OFF knob INCREASE PRESSURE DECREASE PRESSURE 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 affixed inside the front access Manifold pressure tap plug Electrical terminals panel. If there is more than one pool/spa heater connected to the gas supply line, turn each of those appliances "ONU"SEwOhNiLleY HteAsYtWinAgRDthGeEhNeUaINteEr.REPLACEMENT PARTS 6. Take a pressure reading with the heater running, the value should agree with thToePls:oe9m0io8nn-3aT5,1Ca-b5A4lC0e0le1m5mw.owInfws,.thNhaCeywNaarsdhpvoilolel.,cTomN pressure 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 de- crease 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 resulting in severe injury and/or death. USE ONLY HAYWARD GENUINE REPLACEMENT PARTS Pomona, CA Clemmons, NC Nashville, TN Tel: 908-351-5400 www.haywardpool.com

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Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
34
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:
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 instruc-
tions on the label affixed 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
pressure 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 de-
crease 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 resulting in severe injury and/or death.
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 r ight away. Be sure to leak test the heater
gas manifold fittings 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 verified by the installer to ensure proper operation.
Figure 26: Gas valve
Inlet
pressure
tap plug
ON/OFF
knob
Manifold
pressure
tap plug
Regulator
adjustment
screw under
this screw
cap
Electrical
terminals
INCREASE
PRESSURE
DECREASE
PRESSURE