Watts AERCO Benchmark 2.0LN, Operating & Maintenance Instructions

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MAINTENANCE
7-1
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 complete CSD-1
inspection check list
WARNING!
TO AVOID PERSONAL INJURY, BEFORE
SERVICING:
(A ) DISCONNECT THE AC SUPPLY BY
TURNING OFF THE SERVICE SWITCH
AND AC SUPPLY CIRCUIT BREAKER
(B) SHUT OFF THE GAS SUPPLY AT THE
MANUAL SHUT-OFF VALVE PROVIDED
WITH THE UNIT
(C) ALLOW THE UNIT TO COOL TO A
SAFE TEMPERATURE TO PREVENT
BURNING OR SCALDING
7.2 SPARK IGNITER
The spark igniter, part number GP-122435-S, is
located in the body of the burner (see Fig. 7.1).
The igniter may be HOT, therefore 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.
FLAME
DETECTOR
IGNITER
CONTACTOR
BURNER
Figure 7.1
Spark Igniter and Flame Detector Location
Top View
CAUTION!
The igniter may be hot
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 tem-
perature 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.