Installation Sheet
40 Page
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.
If the heater is part of an Easy-Link or Multi-Unit System, close the inlet and
outlet water valves to isolate the heater. Then proceed to step 6.
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 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.
Normal Operaon
Owner's Guide
above the
burner
Red or Yellow
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.
1. Shut off the manual gas valve on the gas supply line.
2. Remove the screw for the pressure port 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 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 up water faucets to create maximum flow.
Press and hold the MAX buttons on the left and right computer boards simultaneously. Take a reading of the
supply dynamic gas pressure with all gas burning equipment run-
ning at maximum rate.
7. The static and dynamic pressures should be within the ranges
specified on the heater's rating plate and the table on p. 21.
8. The difference of static to dynamic pressure should not exceed
1.5" W.C. (0.374 kPa) Pressure drops that exceed 1.5" W.C. (0.374
kPa) can indicate restricted gas flow, undersized gas lines, and/
or undersized supply regulators. In Canada, refer to B149.1 for
allowable pressure drops.
9. Measure gas supply pressure at minimum heater operation:
Reduce water flow so the heater is running at mini mal operation.
Press the MIN button on the right or left computer board in com-
bustion operation. (Refer to the right diagram.) Take a supply gas pressure reading and verify that it is within
the specified inlet gas pressure range.
-Measuring inlet gas pressure-
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.
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
Inlet water
valve
Drain plug
(Small)
Drain plug with Filter (Large)
Gas
valve
Pressure
relief valve
Left
computer board
Right
computer board
Center computer board
Max. button
Min. button