Removing, Replacing, And Verifying The Gas Orifice Assembly - American Water Heater 160X3P Manual

Unscrew and keep the 4 screws
7
securing the venturi body to fan
assembly. See Figure 31 on page 46.
Remove and set aside the old P75
8
O-ring, venturi duct, and P50
O-ring. See Figure 31 on page 46.
Remove and set aside the three
9
screws securing the gas valve
solenoid assembly to the venturi
assembly. Set aside the assembly and
gasket for re-installa on. Keep the
gasket safe from damage.
Remove and set aside the three
10
screws securing the air damper
assembly to the venturi assembly. Set
aside the old P40 O-ring. See Figure 31
on page 46.
Replacing the venturi assembly:
WARNING! The venturi assembly
must be properly installed to prevent
exhaust gases from leaking. Failure to
follow can cause carbon monoxide
poisoning or death.
Place the new P40 O-ring on the
11
new venturi assembly and secure
the air damper assembly to the new
venturi assembly. Inspect the O-ring, if
any cuts or nicks are present replace it
immediately. Reference See Figure 31
on page 46. for correct part placement
and orienta on.
Place the O-ring removed earlier
12
from the gas valve solenoid
assembly on the new venturi assembly.
Inspect the O-ring, if any cuts or nicks
are present replace it immediately.
Secure the gas valve solenoid to the new
venturi assembly with the three screws
removed earlier. Reference See Figure
31 on page 46. for correct part
placement and orienta on.
Insert the new venturi duct and
13
O-ring P50 into the new venturi
assembly. Inspect the O-ring, if any cuts
or nicks are present replace it
immediately. Reference See Figure 31
on page 46. for correct part placement
and orienta on.
Install the new P75 O-ring on the
14
fan assembly. Inspect the O-ring,
if any cuts or nicks are present replace it
immediately. Reference See Figure 31
on page 46. for correct part placement
and orienta on.
Rea ach the venturi body to the
15
new fan assembly and secure
with the four screws removed earlier.
See Figure 31 on page 46. for correct
part placement and orienta on.
Reconnect the copper gas pipe (#
16
104). A ach the 16-25A metal
fasteners on both ends of copper gas
pipe. Inspect the O-rings, if any cuts or
nicks are present replace
immediately.
Reconnect the three cables on
17
the fan motor assembly to their
plas c connectors. Reference Figure 32
to iden fy cables.
Use the white plas c cable clips
18
removed earlier to organize the
series of ver cal cables along the right
side of the water heater.
Before proceeding , take a moment
19
to check all wiring connec ons and
pipe connec ons. Make sure all are mated
correctly and seated securely.
Turn on the gas supply to the
20
water heater at the manual gas
shutoff valve. Turn the gas supply on and
check for leaks. If any leaks are detected,
ghten the appropriate connec on(s)
and re-check.
Replace the front cover and
21
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.
On-Demand Water Heater Service Handbook for X3P Models
Reconnect power to the water
22
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.
Verify proper opera on of the
23
water heater.
Removing,
Replacing, and
Verifying the Gas
Orifi ce Assembly
WARNING!
• To ensure your safety and the
safety of others, read and follow
them
each step of these instructions.
Failure to do so could result in
personal injury or death.
• If you do not have the skills
necessary to complete this
procedure correctly, do not
proceed. Seek assistance from a
qualified service technician.
Removing the gas orifice assembly:
Tools Needed: #2 Phillip's Head
Screwdriver, #2 Phillip's Head
Screwdriver (8" or longer with magnetic
tip)
NOTICE: DO NOT USE ELECTRIC
SCREWDRIVERS OR DRILLS, HAND
TIGHTEN ALL SCREWS TO PREVENT
OVER TIGHTENING.
Disconnect power to the water
1
heater by unplugging it from
the wall outlet or turning it off
at the circuit breaker, as appropriate.
The power button on the water heater
and remote does NOT disconnect
power to the water heater. You must
physically disconnect power to the
water heater.
• 47