AERCO Esteem O&M Manual - Manual (Page 76)

70
Control Module Fuses
Initial Troubleshooting Checks
WARNING
L
ABEL ALL WIRES AND WIRE CONNECTIONS PRIOR TO DISCONNECTING WHEN SERVICING ANY BOILER CON
-
TROLS
. W
IRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION
. A
LWAYS DISCONNECT THE
POWER SUPPLY TO THE BOILER BEFORE SERVICING
. F
AILURE TO COMPLY COULD RESULT IN SEVERE PER
-
SONAL INJURY
,
DEATH OR SUBSTANTIAL PROPERTY DAMAGE
.
WARNING
N
EVER BYPASS
(
JUMPER
)
ANY BOILER
,
CONTROL OR DEVICE EXCEPT FOR MOMENTARY TESTING WHEN
TROUBLESHOOTING THE BOILER AS OUTLINED IN THIS GUIDE
,
SEVERE PERSONAL INJURY
,
DEATH OR SUB
-
STANTIAL PROPERTY DAMAGE CAN RESULT
.
• Ensure all wire connectors to the control module and sensors are securely connected.
• Ensure the maximum gas supply pressure does not exceed 13”w.c. during fl ow or no fl ow con-
ditions.
• Ensure the gas supply pressure is a minimum 5” w.c. during fl ow conditions (burner fi ring on all
gas appliances).
Control Module Fuses
N
OTICE
The control module contains 2 internal replaceable fuses. Ensure the fuses are in working
condition prior to replacing the control module or any boiler component. If one of the fuses
has blown, it will prevent the control module and/or boiler components from operating prop-
erly.
To check or replace the control module fuses:
1. Disconnect the external power supply to the boiler.
2. Remove the front jacket panel of the boiler by removing the thumb screw along the top edge.
3. Remove the electrical connectors at the MCBA control module for the igniter, transformer and
display (ribbon cable) and the black plastic housing cover off the control module. Use care
not to damage the cover when removing it.
4. Remove both fuses and check for continuity to determine if fuse is blown, replace if neces-
sary.
5. The control module is supplied from the factory with 2 spare fuses, a 5 amp fast acting fuse
and a 4 amp slow acting fuse, attached to the control module cover.
6. When replacing the fuses ensure the amp rating and type of the fuse matches the replace-
ment fuse. See Figure 27 on page 71, page 4 for amperage and location of the fuses.
WARNING
D
O NOT BYPASS ANY FUSE WITH A JUMPER
. D
O NOT REPLACE ANY FUSE WITH A FUSE THAT IS NOT
SPECIFIED
. F
AILURE TO COMPLY COULD RESULT IN SEVERE PERSONAL INJURY
,
DEATH OR SUBSTAN
-
TIAL PROPERTY DAMAGE
.
GF-125