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Use a non-contact circuit tester to
confirm that power is off before
working on or near any electrical parts.
Shut off the gas supply to the
2
water heater at the manual gas
shutoff valve.
Shut off water to the water
3
heater and drain the system.
Place a bucket under the water heater
and open the drain port. Allow the
system to completely drain before
proceeding.
Remove
the
16-25A
4
fasteners on both ends of the
copper gas pipe (# 104) and set them
aside for re-installa on. See Figure 34.
16-25A Fastener
Copper Gas Pipe
Figure 34: Gas Pipe and Fan Motor Assembly
removal.
Remove and set aside the three
5
screws securing the gas solenoid
valve assembly to the fan assembly. Figure
35.
Separate the gas solenoid valve
6
assembly from the fan assembly.
This can be done without disconnec ng
the various wiring connec ons. See
Figure 35.
Remove and set aside the two
7
screws securing the orifi ce and
orifi ce gasket to the gas solenoid valve
assembly. Set the screws aside for re-
installa on. See Figure 35.
Remove the oval O-ring
8
the gas solenoid valve assembly. See
Figure 35.
Replacing the gas orifice assembly:
48
•
On-Demand Water Heater Service Handbook for X3P Models
WARNING! The gas orifi ce assembly
must be properly installed to prevent
exhaust gases from leaking. Failure to
follow can cause carbon monoxide
poisoning or death.
Before proceeding, confi rm the
9
new orifi ce is correct for the type
of gas you are using. Assemble the new
orifi ce components in the following order.
See Figure 35 for assembly order and gas
orifi ce plate iden fi ca on.
1
Oval O-ring.
Orifi ce
2
metal
3
Orifi ce Gasket
Note the orienta on of the components.
All holes will line up if it is correctly
oriented. Secure the orifi ce components
with the two screws removed earlier.
See Figure 35.
Rea ach the gas solenoid valve
10
assembly to the fan motor
assembly. Secure it with the three
screws removed earlier. Make sure the
new oval O-ring
not pinched.
Connect the Fan Blower motor
11
wire to the computer board.
Reference the wiring diagram on page
28 or in the maintenance sheet for
placement.
3 Screws
NA LP
1
from
NA LP
1
is properly seated and
Gas Solenoid Valve Assembly
3
2
1
Figure 35: Fan Assembly
Reinstall the copper gas pipe
12
using the 16-25A metal fasteners
removed earlier. Inspect the O-rings, if
any cuts or nicks are present replace
them immediately. See Figure 34.
Before proceeding , take a moment
14
to check all wiring connec on and
pipe connec ons. Make sure all are mated
correctly and seated securely.
Replace the front cover and
15
secure with the four screws
removed earlier. Note the placement of
the built-in controller when se ng the
front cover in place to ensure proper
alignment.
Reconnect power to the water
16
heater by plugging it into the wall
outlet or turning it on at the circuit breaker,
as appropriate. Press the On/Off bu on to
turn the water heater back on.
Turn on the gas supply to the
17
water heater at the manual gas
shutoff valve.
Verify proper opera on of the
18
water heater.
Fan Assembly
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