AERCO BMK 2.0 LN Nat. Gas for Mass. only - Manual (Page 51)

MAINTENANCE
CHAPTER 7 MAINTENANCE
7.1 MAINTENANCE SCHEDULE
The unit requires regular routine maintenance to
keep up efficiency and reliability. For best
operation and life of the unit, the following
routine maintenance procedures should be
carried out in the time periods specified in Table
7-1. See Appendix I for a complete CSD-1
inspection check list.
WARNING
TO AVOID PERSONAL INJURY,
PRIOR TO SERVICING:
• DISCONNECT THE AC SUPPLY BY
TURNING OFF THE SERVICE
SWITCH AND AC SUPPLY CIRCUIT
BREAKER.
• SHUT OFF THE GAS SUPPLY AT
THE MANUAL SHUT-OFF VALVE
PROVIDED WITH THE UNIT
• ALLOW THE UNIT TO COOL TO A
SAFE WATER TEMPERATURE TO
PREVENT BURNING OR SCALDING
7.2 SPARK IGNITER
The spark igniter (part no. GP-122435-S) is
located on the burner plate (see Figure 7-1). The
igniter may be HOT. Care should be exercised.
It is easier to remove the igniter from the unit
after the unit has cooled to room temperature.
To inspect/replace the Igniter:
1. Set the ON/OFF switch on the control panel,
to the OFF position. Disconnect AC power
from the unit
2. Remove the side and top panels from the
unit.
3. Disconnect the igniter cable from the igniter.
4. Using a 15/16” wrench, unscrew the igniter
from the burner head. Remove the igniter
from the burner shell, by grasping the
contact end of the igniter.
5. The igniter is gapped at 1/8-inch. If there is a
substantial erosion of the spark gap or
ground electrode, the igniter should be
replaced. If carbon build-up is present, clean
the igniter using fine emery cloth. Repeated
carbon build-up on the igniter is an
indication that a check of the combustion
settings is required (see Chapter 4 for
combustion calibration.
6. Prior to reinstalling the igniter, a high
temperature anti-seize compound must be
applied to the igniter threads.
7. Reinstall the igniter. Do not over tighten the
igniter. A slight snugging up is sufficient.
Reconnect the igniter cable.
8. Reinstall the side and top panels on the unit.
TOP VIEW
SEE
DETAIL “A”
BURNER
PLATE
FLAME
DETECTOR
SPARK
IGNITER
STAGED
IGNITION
ASSEMBLY
TOP VIEW
Figure 7-1
Spark Igniter and Flame Detector
Location – Top View
7-1