Noritz WHiC56 Service Manual page 46

■ Circuit Board Replacement Procedure
When swapping in a new circuit board, the new circuit board needs to be programmed.
Failure to successfully program the circuit board will result in a 73 error code.
Typically this programming can be done with a data transfer from the old circuit board to the new circuit board.
Even a damaged circuit board can usually transfer data properly.
Always attempt the data transfer first, and if unsuccessful, retry the data transfer procedure.
Only if the data transfer is unsuccessful, then you should follow the procedure for manual programming on the reverse side of this page.
1. Data Transfer Procedure
( for illustration only )
various connections
to unit
water
heater
new circuit
unit
board
2. DIP Switch Settings
*Disconnect the electrical power to the unit before adjusting the DIP Switches.
DIP Switch Settings are set to the same as the old circuit
The following settings can be adjusted using the DIP Switches:
1. By using SW 1, adjustments can be made for installations at elevations above 610m.
Adjust the DIP switches as illustrated in the table ,if this water heater is installed at
an altitude of 610m or higher.
2. By using SW3, 4 and 5, adjustments can be made for installations flue type "B23".
For Type "B23", be sure to turn SW 3 ON.
"Single unit operation" and" Multi system "are distinguished by SW 4 and 5.
3. By using SW 7 and 8, adjustments can be made for extended flue lengths.
Refer to the "Setting list for DIP Switches" and "DIP Switches No.7 and No.8 details" table for details.
[ DIP Switches] Setting list for DIP Switches
SW1
High elevation
adjustment
SW1
0-610m
611-1,220m
OFF
ON
*Internal model only.
1. Make sure the remote controller is off
( completely blank ), If it is ON, turn it
OFF and wait for 10 seconds.
2. ...then disconnect electrical power.
3. Remove old circuit board out of the unit
and transfer all electrical connections
to the new circuit board.
...except connector CN89 which
should be left unplugged.
4. Use the blue and white data transfer cable supplied
data transfer cable
with the new circuit board to connect the CN89
linking CN89 connection
connection from the old circuit board to the new one.
old circuit
board
5. Connect power and wait about 30 seconds to a minute.
The unit will signal a successful data transfer by spinning the fan
and opening and closing the gas valve for about 3 minutes.
If you get a successful data transfer: disconnect electrical power to
the unit, disconnect the data transfer cable and reconnect the original
CN89 connector.
The circuit board can now be mounted back into the unit.
Note: (If you disconnected any wires to pull out the circuit board,
Burner gas pressures should be checked with a digital manometer
and adjusted if necessary.
Refer to the "Setting list for MW settings and Burner Gas pressures"
at reverse side.
If you fail to get a successful data transfer,
refer to the reverse side for Manual Programming.
( : ON
SW3 SW4 SW5
Type:B23 adjustment*
SW3 SW4 SW5
Single unit operation
Multi system
(Quick connect/System controller)
Buttons for adjusting the burner gas pressure settings
Connector CN89
make sure to reconnect all wires.)
board.
: OFF ) DIP Switches No.7 and No.8 details
SW7 SW8
WHi49,LWHi49 model
Select
Flue length
results
adjustment*
SW7 SW8
A
A
B
B
C
C D
D
*WHi49,LWHi49 series flue system type is Room sealed, if the heater exhibits noise
and vibration when installed with flue terminal and flue (less than 2 meters) without
elbow, the DIP switch should be changed.
Refer to DIP switch table No.7 and No.8. Select result "C long length".
- 46 -
DIP Switches
New
Disconnect remote controller plug
Circuit
when transferring data (see Step 2)
Board
To Remote Controller
Connect data transfer cable to
transfer the data from the old
circuit board to the new circuit
Old
board (see Step 3)
Circuit
Board
Location of
DIP Switches
< Internal model only>
WHi49,LWHi49 model
Type:B only
23
WHiC56,LWHiC56 model
Type:C ,C only
13 33
Type:C ,C ,C
13 33
Type:B
23
Minimum length Short length
Short length Long length
Long length
Maximum length
53