46
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 Operation
Owner's Guide
Pressure
port
-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.
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 fau-
cets to create maximum flow. Press and hold the MAX button on the computer
board. Take a reading of the supply dynamic gas pressure with all gas burning
equipment running 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. 26.
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 pressure drops cannot exceed those specified in CSA B149.1.)
9.
Measure gas supply pressure at minimum heater operation: While water is flowing through the heater, press the
MIN button on the computer board. (Refer to the diagram below.) Take a supply gas pressure reading and verify
that it is within the specified inlet gas pressure range.
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
110U / 310U
Computer board
MAX button
MIN button
510U
Computer board
MIN button
MAX button
Inlet
water valve
Drain plug
(Small)
Outlet
water valve
Drain plug with Filter (Large)
