62
Page
MAINTENANCE AND SERVICE
•
Turn off the electrical power supply and close the manual gas shutoff valve
and the manual water control valve before servicing.
•
Failure to do so could result in severe personal injury, or death.
WARNING
•
Clean the cold-water inlet filter. (Refer to the Unit Draining and Filter Cleaning Section on this page.)
•
Be sure that all openings for combustion and ventilation air are not blocked.
•
The venting system should be checked annually for any leaks, corrosion, blockages or damage.
•
The burner should be checked annually for dust, lint, grease or dirt.
• Keep the area around the water heater clear. Remove any combustible materials, gasoline or any
flammable vapors and liquids.
•
If the relief valve discharges periodically, it may be due to thermal expansion in a closed water supply
system. Contact the water supplier or local plumbing inspector on how to correct this situation.
•
Visually check of burner flames (see below) through the burner window in the burner assembly
located at the middle of the water heater.
Satisfactory
Blue flame
Unsatisfactory
Flame
blowing up
Unsatisfactory
Red or Yellow
flame
The manufacturer recommends having the unit checked once a year or as necessary by a licensed
technician. If repairs are needed, any repairs should be done by a licensed technician.
Normal Operation
Owner's Guide
Pressure
port
-Measuring inlet gas pressure-
1. Turn off all electric power to the water heater if service is to be performed.
2. Turn the manual gas valve located on the outside of the unit to the off position.
3. Failure to follow these steps could lead to fire or explosion, resulting in personal injury
or death.
WARNING
The water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions
on how to check the inlet gas pressure.
THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL
.
7.
The static and dynamic pressures should be within the
ranges specified on the heater's rating plate and the table
on p. 31.
8.
The difference of static to dynamic pressure should not
exceed 1.5" W.C. Pressure drops that exceed 1.5" W.C. can
indicate restricted gas flow, undersized gas lines, and/or
undersized supply regulators. (NOTICE: In Canada, the pres-
sure drops cannot exceed those specified in CSA B149.1.)
9.
Measure gas supply pressure at minimum heater operation:
Reduce water flow so the heater is running at minimal oper-
ation. Press the MIN button on the computer board. (Refer
to the diagram.) Take a supply gas pressure reading and
verify that it is within the specified inlet gas pressure range.
1.
Shut off the manual gas valve on the gas supply line.
2.
Remove the screw from the pressure port which is located on the gas inlet of the water
heater shown in the diagram on the right.
3.
Connect the manometer to the pressure port and zero the manometer.
4.
Re-open the manual gas valve. Verify that there are no gas leaks.
5.
With all gas burning equipment off, take a reading of the static gas pressure and make a
note of it.
6.
Measure gas supply pressure at maximum heater operation: Open hot water faucets to cre-
ate maximum flow. Press the MAX button on the computer board. (Refer to the diagrams
below.) Take a reading of the supply dynamic gas pressure with all gas burning equipment
running at maximum rate.
540P Computer board
MAX button MIN button
