SER
VICE PR
OCEDURE
S
SER
VICE PR
OCEDURE
S
32 • On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models
SERVICE PROCEDURES
Unit Draining and
Filter Cleaning
WARNING
Water drained from the water heater
may be hot and could cause severe
burns. Failure to observe proper
safety practices could lead to serious
personal injury.
1. Close the manual gas shut off valve.
2. Turn OFF power to the unit, then
turn it ON again.
3. Wait 30 seconds, then turn OFF
power to the unit again.
4. Close the cold water shutoff valve
5. Open nearby hot water faucets.
When the water flow stops, close
all hot water faucets.
6.
IF
the installation includes isolation
valves, follow these sub-steps:
6.1 Place a bucket or pan
underneath each isolation valve
drain port. (There are two: one
on the COLD line and one on
the HOT line.) See Figure 17.
If you connect hoses to the
isolation valve service ports,
only one bucket is needed.
6.2 Remove the plugs from each
isolation valve drain port,
then open their valves to
drain the water.
6.3 Go to step 8.
7. Place a bucket or pan under the water
filter/drain plug to catch the water
when it drains (Figure 17). You may
also drain the water to the outdoors.
8. Open the drain port by turning it
counter-clockwise for two turns. (The
drain port is shown at the far left-hand
side of Figure 17.) There is no need to
remove the drain port plug.
9. Remove the water filter drain plug
and the water filter.
10.
Clean the filter.
With a small brush,
clean the water filter of any debris
which may have accumulated. (See
Figure 18). When the filter is clean,
reinstall it.
NOTICE:
The filter strainer basket
can be separated from the filter
threads. When separated, be sure
that the O-ring is not lost and is in
place before you reinstall the filter.
11. Replace all plugs and close all drain
valves.
NOTICE:
Drain plugs must be hand
tightened only.
Isolation Valve Drain Port (Cold)
Gas Shutoff
V
al
ve
Isolation Valve Drain Port (Hot)
Hot Water Shutoff Valve
Water Filter/Drain Plug (Cold Inlet)
Do Not
Remove
This
Plug
Cold Water
Shutoff Valve
Drain
Port
Figure 17. Drain Plugs
. Clean the water filter
with a brush.
Figure 18
