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Part Number 550-142-300/0520
15
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Prepare boiler — vent damper installation2e
4. Read and apply the harness plug warning label
(shown above) so that it is visible after installation.
5. Plug damper harness receptacle into damper harness
plug.
Bypassing (jumpering) vent damper
will cause flue products such as
carbon monoxide to escape into
the house. This will cause severe
personal injury or death.
After boiler has operated once, if ei-
ther end of harness is disconnected,
the system safety shutdown will oc-
cur. The boiler will not operate until
harness is reconnected.
Effikal or Field Controls damper —
Damper hold open switch must be
in Automatic Operation position
for system to operate properly.
These systems are used on gas-fired boilers with vent
dampers as shipped from factory. Boiler will not operate
without vent damper installed.
Only vent dampers listed in the Replacement parts list
on page 58 are certified for use with CGa boilers. Any
other vent damper installed could cause severe personal
injury or death.
Installation
1. Install vent damper horizontally or vertically as
shown in vent damper manufacturer’s instructions.
Vent damper must be installed so that it serves only
one boiler and so damper blade indicator is visible
to the user. See Figure 8.
2. Screws or rivets used to secure the vent damper to
the draft hood must not interfere with rotation of
the damper blade.
3. Install damper harness between damper actuator
and knockout in jacket top panel. Use strain relief
connectors and locknuts to secure both ends of
damper harness.
Keep wiring harness clear of all hot
surfaces.
Damper blade
Spark-ignited pilot systems— Refer to vent manu-
facturer’s instructions to install plug (shipped with
damper) in damper hole. For spark-ignited pilot
boilers only, install
plug with no hole in vent damper
hole.
Minimum clearances
Provide a minimum of 6” between the vent damper and
any combustible material. (Provide a minimum of 36 "
between jacket top and combustible ceiling.)
Do not modify draft hood or vent damper, or make an-
other connection between draft hood and vent damper
or boiler except as noted below. This will void CSA
certification and will not be covered by Weil-McLain
warranty. Any changes will cause severe personal injury,
death or substantial property damage.
Figure 8 Vent damper assemblies
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