Changing The Fan Motor - Noritz NR50-OD Service Manual

Changing the Fan Motor

When Bell-mouth(B) is installed in the old fan motor, install Bell-mouth (B) as shown in figure to maintain the proper air volume.
When you change the fan motor, please remove this part from the old fan motor, and install in the new fan motor.
After changing the fan motor, please follow the procedure "Circuit Board Settings 1" or "Circuit Board Settings 2".
The water heater will not operate properly unless you carry out this step.
A
*Please follow either procedure after changing the fan motor.
*When the water heater has no remote controller, make sure to
connect a remote controller before performing the below steps.
Circuit Board Settings 1
1. Check that there is no water flow.
2. Within the first ten minutes of connecting electrical power, before turning it on (*1),
press and hold the "FLOW METER ALARM SET" button on the remote
controller until a tone is heard (2 sec.) and "120"(example) appears on the display.
3. Press the "FLOW METER ALARM SET" button to change the writer number
until "11 1" appears on the display.
4. Press the "UP" button for 5 sec to change the setting number from "1" to "2"."11 2"
appears on the display.
5. Set the "POWER" button to ON or let the unit sit for 30 seconds.
Note 1. Disconnect electrical power after setting the "POWER" button off on the
remote controller.
The water heater will automatically turn on when electrical power is reconnected
if this step is not followed.
Circuit Board Settings 2
1. Check that there is no water flow.
2. Within the first ten minutes of connecting electrical power, before turning it on (*1),
press and hold both the "UP" and "DOWN" buttons on the Circuit Board as illustrated
to the right until the controller emits a beeping sound. The setting will be not completed
if this is not done.
Note 1. Disconnect electrical power after setting the "POWER" button off on the remote
controller. The water heater will automatically turn on when electrical
power is reconnected if this step is not followed.
A : Fan motor
B : Bell-mouth
C : Tapping Screw x 3
B
C
Remote Controller
[RC-7649M , RC-7650M]
Display
(Setting Number.)
Display
(Writer Number.)
PRIORITY
Please read instructions carefully
before using this appliance.
WARNING
Check actual and controller water
temperature before entering shower
or bath.
Hot Water Heater temperature
over 125 F can cause severe burns
instantly or death from scalding.
RC-7649M
"FLOW METER ALARM SET"
(Selecting Writer Number)
Circuit Board
"UP" and "DOWN" buttons for
adjusting the manifold pressure
settings
79
"UP"
(Changing Setting Number)
"POWER"
(Operation Button)
UP
POWER
BURNER ON
gal .
ON/OFF
DOWN
FLOW METER
ALARM SET