Circuit Board Replacement - Electrolux EN18WI30LS Service Manual

<EN18WI30LS, EP18WI30LS, EN19WI30LS, EP19WI30LS>

Circuit Board Replacement

* Be sure to read.
It is necessary to transfer data and adjust the hard dip switches when
replacing a circuit board. Vital information about the water heater such
as the settings and unit history will have to be written to the new board.
Please transfer data using the following procedure. If the transfer is not
successful, the unit will not operate and a 73 error code will flash on the
remote controller.
Dip Switch Settings
* Disconnect power to the water heater before adjusting the
Hard Dip Switches.
The following settings can be adjusted using the Hard Dip Switches:
1. By using SW 1 and 2, the maximum temperature can be set.
2. By using SW 3, the air supply type can be set to direct vent(DV) or non-direct vent(SV).
3. By using SW 5 and 6, adjustments can be made for use at high elevation.
4. By using SW 7 and 8, adjustments can be made for extended vent lengths.
Refer to the "Setting list for Hard Dip Switches" table for details.
Data Transferring Procedure
When a circuit board is replaced, data must be transferred from the old board, otherwise
a 73 error code will flash on the remote controller and the unit will not operate.
After installing the new circuit board, please transfer data according to the
following procedure:
1. With the electrical power disconnected, remove the remote controller connection from
connection number CN89.
2. Using the supplied transfer cable, connect the new and old boards by
inserting the cable in connection number CN89 of each board.
3. Reconnect the electrical power. The data transfer will be completed in about 30 seconds.
The unit will signal a successful transfer by rotating the fan and opening and
closing the gas solenoid valve.
4. After confirming a successful transfer, turn the power off. Remove the cable connecting
the new and old circuit boards. Reconnect remote controller connections.
5. Before connecting electrical power, confirm that the hard dip switch settings on the new board
match the settings on the old board. Refer to the "Dip Switch Settings" section for details.
* After replacing the board, check and adjust manifold gas pressure settings to the
values listed in the "Setting list for Gas manifold pressures" table.
* When you cannot transfer data between the boards, please follow the procedures
under "Data Transfer Troubleshooting".
Data Transfer Troubleshooting
1. If this is the first time that the circuit board has been replaced:
Please follow the procedure "Initial Circuit Board Settings".
2. If this is the second time that the circuit board has been replaced:
Please follow the procedure "Circuit Board Resetting".
* If data has already been transferred to the board, follow the resetting procedure.
** Once data has been transferred to a new board, the transfer procedure cannot
be performed again.
Initial Circuit Board Settings
* A remote controller must be connected to the unit for this procedure.
* After replacing the circuit board, make sure all connections
are made before making the initial circuit board settings.
1. Connect electrical power to the unit and wait ten seconds before proceeding to step 2.
2. Within the first ten minutes of connecting electrical power, before turning on the operation
button, hit the "up" or "down" button on the remote controller and hold until the display
blinks "99". If the unit does not go into maintenance mode, unplug the unit and try again.
3. Use the "up" or "down" button on the remote controller to change the maintenance
writer number.
4. Press the "FLOW METER ALARM SET" for 0.5 sec to change the setting ON/OFF.
ON: "priority" lamp flashes.
OFF: "priority" lamp goes off.
5. Change "2B" from OFF to ON
6. Change "FE" and "FC" from OFF to ON in order to access the hidden maintenance writers.
(Display blinks with "A0".)
7. Now the maintenance writers can be accessed by hitting the "up" or "down" button
on the remote controller. Refer to the "Setting list for Soft Dip Switches" table for the
correct writer setting.
8. Press the "FLOW METER ALARM SET" for 0.5 sec to change the setting ON/OFF.
ON: "priority" lamp flashes.
OFF: "priority" lamp goes off.
9. When all of the maintenance writers have been set correctly, confirm the settings
by pressing and holding both the "up" and "down" buttons on the remote controller
until the controller emits a beeping noise. The new settings will be lost if this is not done.
10. If necessary, adjust the hard dip switch settings on the new board to match the
settings on the old board. Refer to the "Dip Switch Settings" section for details.
Note 1. To cancel the settings, let the controller sit for 10 minutes,
or turn on the operation button. The information set previously
will be canceled. To change settings again, follow steps 1 through
Note 2. Only change data as listed in the "Setting list for Soft Dip Switches" table.
Setting list for Soft Dip Switches
Gas type
Model
EN18WI30LS Natural
EP18WI30LS LPG
EN19WI30LS
Natural
EP19WI30LS
LPG
9.
● ○
Circuit board DIP setting ( :ON :OFF)
A1 A2 A3 A5 A6 A7 A8 A9
AA
● ○ ○ ● ● ○ ○ ●
○
○ ○ ○ ● ● ○ ○ ●
○
● ○ ○ ● ● ○ ○
○
●
○ ○ ○ ● ● ○ ○
○ ●
Setting list for Hard Dip Switches
SW1 SW2 SW3
Max temp Switches Air supply Switches
Maximum temperature Air supply type
setting
Air supply
SW1 SW2 SW3
○ ○ ○
120°F * Outdoor : DV
● ○ ●
130°F Indoor : SV
○ ●
140°F
● ●
120°F
*Maximum temperature can be adjusted using the Soft Dip Switches.
Reference connection diagram
(for simplification, other connections have been omited)
Buttons for adjusting the manifold pressure settings
Hard Dip Switches
New
Circuit
Board
89
Connecter CN89
Old
Circuit
Board
89
Circuit Board Resetting
1. Install the circuit board into the unit and make all wiring connections.
2. Within the first ten minutes of connecting power to the unit, perform
steps 1 through 4 and step 6 of the "Initial Circuit Board Settings" procedure. This
should result in "A0" blinking on the remote controller.
3. If the "A0" maintenance writer is "ON" ("priority" lamp flashes.), press the
"FLOW METER ALARM SET" button for 0.5 seconds to change "A0" to
"OFF" ("priority" lamp goes off).
4. Press and hold both the "up" and "down" buttons on the remote controller
until the controller emits a beeping noise. The new settings will be lost if this
is not done.
5. If this is a replacement board that had initial problems with data transfer, follow
the "Data Transferring Procedure".
Display
AB AD AE B1 B2 B5 B7 B8 BC
● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ●
● ● ● ● ○ ● ● ● ●
● ● ● ● ○ ● ● ● ●
32
● ○
( :ON :OFF)
SW5 SW6 SW7
High elevation Switches
Airflow Switches
Elevations above 2000ft Vent Length Adjustment
SW5 SW6 SW7 SW8
○ ○ ○ ○
0~2000ft 3"Short
● ○ ● ○
3"Long
2001~4000ft
○ ● ○ ●
4001~6000ft 4"Short
● ● ● ●
4"Long
6001~8000ft
[ Hard Dip Switches ]
Disconnect when
transferring
To Remote Controller
Connecter Lead attached
with a New Circuit Board
for Servicing
Setting Button
Manifold Pressure (inch H
C1 C3 C7
Max value
● ● ●
2.95
● ● ●
3.60
● ●
●
3.20
●
● ●
3.70
SW8
OFF
ON
Power On/O Button
Flow Meter Alarm Set button
O) Cover off
2
Min value
1.10
1.35
1.50
1.50