Smith Cast Iron Boilers GB200 SERIES - Manual (Page 6)

6
STEP 4: VENTING BOILER
A factory-mounted spill switch is provided on all GB200 boil-
ers (see Figures 2.4 & 2.4A).
The flue or vent connectors must be installed flush with the
inside chimney liner surface and sealed in place with furnace
cement. Horizontal positions of the single wall and type B
venting systems shall be supported by use of strap hangers
or their equivalent. Vent supports should be placed a maxi-
mum of 15 feet apart and as required to prevent sagging.
The vent connectors shall be pitched 1/4" per foot upwards
towards the chimney or vent termination.
Installing Vent Damper
The vent damper must be mounted directly on top of the draft
diverter. The vent outlet extension must be installed between
the damper and the outlet to allow the damper plate to open
and close.
Locate the motor on the front side and position the cable so
that it does not touch the metal surface of the draft diverter
(see Figure 2.4). If necessary, turn angle connector on vent
damper upward until cable clears; tighten locknut to secure.
The direction of the flow arrow imprinted on the vent damper
must point upward. The damper position indicator, which is
located on the side of the vent damper opposite the motor,
must be visible.
CAUTION: A minimum of 6" between vent damper and
combustible materials must be maintained. The vent
damper must be accessible for servicing and checking
position indicator.
If applicable, remove hairpin shipping clip which holds
damper blade in closed position and observe that damper
blade rotates slowly to open position. Do not force it closed
as it may damage the gear train and void the warranty. The
blade should move freely and without obstruction.
Secure the vent damper housing to the draft diverter outlet
with sheet metal screws or pop rivets. Refer to Figure 2.5 for
fastener locations. Install flue pipe over top of vent damper
and secure to damper housing with sheet metal screws or
pop rivets.
Attach vent damper cable to cable clamp on boiler left panel
and join the Molex connector (see Figures 2.4 & 2.4A).
TRANSFORMER
PILOT
CONTROL
VENT DAMPER
PRESSURE
CONTROL
THERMOSTAT
CONNECTION
DK.
BLUE
SPILL
SWITCH
CABLE
BRACKET
THERMOSTAT
CONNECTION
DANGER: Draft diverter, vent outlet and vent damper
as supplied must not be altered in any way, as proper
boiler operation would be jeopardized. Flame rollout,
fire or carbon monoxide poisoning will result.
DANGER: Only the boiler may be served by the vent
damper. Do not attempt to use it to vent an addition-
al appliance. This will cause fire or carbon monoxide
poisoning.
FIGURE 2.4A: VENT DAMPER INSTALLATION
FOR STANDING PILOT
TRANSFORMER
GAS
VALVE
VENT DAMPER
PRESSURE
CONTROL
THERMOSTAT
CONNECTION
DK.
BLUE
SPILL
SWITCH
CABLE
BRACKET
THERMOSTAT
CONNECTION
FIGURE 2.4: VENT DAMPER INSTALLATION
FOR INTERMITTENT PILOT