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The manufacturer recommends having the water heater checked once a year or as necessary by a licensed
technician. If repairs are needed, any repairs should be done by a licensed technician.
Blue flame
Satisfactory
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.
Shut off the manual gas valve on the gas supply line.
1.
Remove the screw from the pressure port which is located on the gas inlet of
2.
the water heater shown in the diagram on the right.
Connect the manometer to the pressure port and zero the manometer.
3.
Re-open the manual gas valve. Verify that there are no gas leaks.
4.
5.
With all gas burning equipment off, take a reading of the static gas pressure and
make a note of it.
Measure gas supply pressure at maximum heater operation: Open hot water
6.
faucets to create maximum flow. Press the MAX button on the computer board.
(Refer to the diagram below.) Take a reading of the supply dynamic gas pressure
with all gas burning equipment running at maximum rate.
The static and dynamic pressures should be within the ranges specified on the
7.
heater's rating plate and the table on p. 28
The difference of static to dynamic pressure should not exceed 1.5"
8.
W.C. Pressure drops that exceed 1.5" W.C. can indicate restricted gas
flow, undersized gas lines, and/or undersized supply regulators.
Measure gas supply pressure at minimum heater operation: Reduce
9.
water flow so the heater is running at minimal operation. Press the
MIN button on the computer board. (Refer to the right diagram.) Take
a supply gas pressure reading and verify that it is within the specified
inlet gas pressure range.
UNIT DRAINING AND FILTER CLEANING
1. Close the manual gas shutoff valve.
2. Turn off power to the unit and wait a couple of seconds. Turn on
again.
3. Wait 30 seconds, and then turn off power to the unit.
4. Close the inlet water valve.
5. Open all hot water taps in the house. When the residual water flow
has ceased, close all hot water taps.
6. Have a bucket or pan to catch the water from the unit's drain plugs.
If Isolation valves are installed, open the drains to drain the water. If
isolation valves are not installed, unscrew the two drain plugs (large
and small) to drain all the water out of the unit. Do not lose the
o-rings that will be on the two drain plugs.
7. Wait a few minutes to ensure all water has completely drained from
the unit.
8. Clean the filter: Check the water filter located within the cold inlet.
With a tiny brush, clean the water filter of any debris which may have
accumulated and reinsert the filter back into the cold water inlet.
9. Securely screw the drain plugs back into place.
Hand- tighten only.
Flame
blowing up
Unsatisfactory
-Measuring inlet gas pressure-
45
Page
Owner's Guide
Normal Operation
Red or Yellow
flame
Unsatisfactory
Pressure
Computer board
MAX
button
MIN
button
Drain plug
with Filter (Large)
Drain plug
(Small)
Water valve
port
Gas
valve
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