Gas Regulator Adjustment - Polaris GAS WATER HEATER Installation, Operation And Service Manual

WARNING
OBSTRUCTIONS OR HOLES IN THE VENT PIPE CAN CAUSE TOXIC
FUMES TO ENTER THE STRUCTURE RESULTING IN CARBON MONOXIDE
POISONING OR DEATH. THE VENT PIPE MUST BE REPLACED IF IT IS
LEAKING.
A U.L. RECOGNIZED FUEL GAS AND CO DETECTOR(S) ARE RECOMMENDED
IN ALL APPLICATIONS AND THEIR INSTALLATION SHOULD BE IN
ACCORDANCE WITH THE MANUFACTURER'S RECOMMENDATIONS
AND/OR LOCAL LAWS, RULES, REGULATIONS, OR CUSTOMS.
IMPORTANT: VERIFY PROPER OPERATION AFTER SERVICING THIS WATER
HEATER.
TROUBLESHOOTING
WATER HEATER SERVICE MUST ONLY BE PERFORMED BY A QUALIFIED
SERVICE TECHNICIAN. Refer to the Troubleshooting Chart on page 27 and 28
for determining the cause of water heater problems.

GAS REGULATOR ADJUSTMENT

WARNING
GAS VALVE ADJUSTMENT MUST ONLY BE PERFORMED BY AN
AUTHORIZED SERVICE AGENT
IMPORTANT: Do not adjust the gas valve pressure setting to get certain flow
rate or input rate on the water heater. The installed input rate of the water
heater will vary depending on inlet and outlet pipe lengths. The correct gas
valve setting is required for proper starting characteristics and gas-air mixture.
The gas valve may require adjustment to obtain the proper air/fuel ratio due to
varying gas heating values. Should it become necessary to check or adjust the
gas valve setting, follow the following procedure:
Shut off the water heater by turning the thermostat to its lowest setting.
1.
Remove the left access door on the base of the water heater.
Using a 3/16" hex key (Allen wrench), remove the plug from the OUT
2.
PRESS tap on the gas valve. See Figure 20.
Connect the high tap of a differential pressure gauge (Dwyer Magnehelic)
3.
to the 1/8" NPT outlet pressure (OUT PRESS) tap on the gas valve. An
inclined mano-meter (slope gauge) may be used if it has a shut-off valve in
the connecting line.
Start the unit. If using an inclined manometer, close the shut-off valve
4.
during start-up so that the initial high pressure will not push the indicating
fluid out of the gauge.
Allow the burner to light and remove the regulator adjustment cap. DO
5.
NOT START OR SHUT-OFF THE UNIT WITH THE REGULATOR
ADJUSTMENT CAP OFF AS THIS MAY RUPTURE THE GAS VALVE
DIAPHRAGM.
MAINTENANCE (cont.)
Read the pressure on the gauge. It should be negative .20 inches of
6.
water column. If not, turn the regulator adjustment screw to adjust to this
reading. MAKE CERTAIN YOU ARE READING NEGATIVE PRESSURE
AND NOT POSITIVE PRESSURE.
7. Replace the regulator adjustment cap and tighten. With the cap on, the
pressure will become more negative (eg -.30 to -.50" W.C., depending on
the vent length).
Restart and cycle the unit three times to check for smooth ignition.
8.
Readjust the negative pressure setting if necessary.
IMPORTANT: If the unit exhibits rough starting or running at the -.20" W.C.
setting, it is acceptable to adjust the pressure setting between -.10"W.C. and
-.30"W.C. to achieve smooth ignition.
IMPORTANT: The regulator pressure setting must be measured with the cap off.
Always replace the cap after the adjustment has been completed. Tighten the
cap firmly. The small balance line will not function properly if the cap is left
loose.
Shut off the water heater and remove the gauge. Replace the outlet
9.
pressure tap plug and the access door. Start the water heater.
25