GWA
Gas-Fired Water Boilers –
Boiler Manual
8
Part Number 670 01 1001 00
1. Connect from draft hood or vent damper outlet to chimney or
vent with same size vent connector.
2. Where possible, vertical venting to the outside from the draft
hood or vent damper outlet will offer best performance.
3. Where horizontal vent connector is used, slope upward at least
¼" per lineal foot toward chimney or vent and support with
hangers to prevent sagging.
4. Breeching must not be connected to any portion of a mechanical
draft system that can operate under positive pressure.
Long horizontal vent connector, excessive number
of elbow or tees, or other obstructions that restrict
the flow of combustion gases should be avoided.
Severe personal injury, death or substantial property
damage could result.
Install vent piping
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 29 are certified for use with GWA boilers.
Any other vent damper installed could cause severe
personal injury or death.
Damper blade
Standing pilot ignition systems— See vent manufacturer’s
instructions to install plug (shipped with damper) in damper hole.
For standing pilot boilers only, install plug with
3
/
8
" diameter hole in
vent damper hole.
Spark-ignited pilot systems— See vent manufacturer’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. (See “Minimum clearance to combustible
materials,” page 3, for minimum clearance from jacket top to ceiling
to maintain this dimension.)
Vent damper
Draft hood installation
1. Orient draft hood with spill switch mounting holes to front of
boiler as shown in Figure 3.
2. Secure draft hood to outlet at top of boiler with sheet metal
screws.
Figure 3
Spill switch with wire harness
Draft hood & spill switch
3. Bottom of draft hood or skirt must have clearance dimension
above jacket top panel as indicated on draft hood.
Do not alter boiler draft hood or place any
obstruction or non-approved vent damper in
breeching or vent system. CSA certification will
become void. Flue gas spillage and carbon
monoxide emissions will occur causing severe
personal injury or death.
Improper orientation of spill switch may cause
boiler to shut down. The loss of heat can result in
significant damage due to freezing.
Spill switch installation
1. Fasten spill switch to draft hood as shown in Figure 3.
2. See Wiring diagram to connect wires:
a. Standing pilot boiler — see page 19.
b. Spark-ignited pilot boiler — see Control Supplement.
2
Prepare boiler
continued
GWA
Gas-Fired Water Boilers –
Boiler Manual
29
Part Number 670 01 1001 00
Figure 16
Section assembly, flue collector, draft hood and vent damper
12 Replacement parts
Item
number
Description
International
Comfort
Products
part number
not shown Replacement
section
assembly
GWA052
GWA070
GWA105
GWA140
GWA175
GWA210
GWA245
321114501WT
321114501WT
321114502WT
321114503WT
321114504WT
321114505WT
321114506WT
1
Radiation plate
(1 per joint)
460003700WT
2
Collector
hood
GWA052
GWA070
GWA105
GWA140
GWA175
GWA210
GWA245
381354625WT
381354626WT
381354627WT
381354628WT
381354629WT
381354630WT
381354631WT
3
Draft hood
GWA052
GWA070
GWA105
GWA140
GWA175
GWA210
GWA245
450021270WT
450021271WT
450021272WT
450021273WT
450021274WT
450021275WT
450021276WT
Item
number
Description
International
Comfor t
Products
part number
4
High limit, 30° differential,
with well
Honeywell L4080D1036
White-Rodgers 11B81-3
510312250WT
5
Spill switch
510350105WT
6
Vent
damper
4" GWA052
GWA070
Effikal RVGP-KS-4BKF
*Johnson Controls Q35GB-2
510512350WT
5" GWA105
Effikal RVGP-KS-5BKF
*Johnson Controls Q35GD-2
510512351WT
6" GWA140
GWA175
Effikal RVGP-KS-6BKF
*Johnson Controls Q35GF-2
510512352WT
7" GWA210
GWA245
Effikal RVGP-KS-7BKF
*Johnson Controls Q35GH-2
510512353WT
* Johnson Controls damper assemblies consist of M35BC
actuator and Y15 vent pipe
7
Vent damper actuator
Effikal RVGP
Johnson M35BE-1C
only with vent
damper above
8
Vent damper harness
591391795WT
