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The appliance should be located as close to the point
of termination as possible. The maximum vent length is
26 feet (8 m) with one 90 degree elbow. Subtract 2½
feet from the total vent length for each additional 90-
degree elbow used (a maximum of three 90-degree
elbows are permitted in the total vent length). Horizontal
sections of vent must pitch ¼" for every foot of
horizontal length and be supported at 4 foot intervals
with overhead hangers. Any vent section greater than
45 degrees is considered an elbow.
Note: The stainless steel exhaust vent pipe should not
be used in concealed or unheated locations. Listed
thimbles or collars are necessary to pass through wall
and ceiling partitions. If the vent system passes through
combustible
areas
where
requirements cannot be maintained, it is permissible to
chase straight sections of sealed 3 inch single wall vent
through 4 inch (or greater) Type-B vent. The distance to
combustibles using this chase technique is 1 inch.
Note: Type-B vent should never be used as the
actual exhaust vent system for the appliance, as
it is not gas tight.
Minimum exhaust vent size and length
Fig. 8
Maximum vent lengths
Fig. 9
6 720 607 072 (16 January)
the
vent
clearance
Note: reduce 2½ ft for each elbow used after the first
one
Vent Safety System
The GWH-635-ES will shut down if inadequate exhaust
venting is detected or a lack of combustion air is
provided to the unit; see troubleshooting section on
page 25. See error code to confirm error, correct the
problem and then reset the heater before operating.
Attaching the exhaust and air inlet connection
adaptors to the top of the heater
Fig. 10
Fig. 11
B Attach the flue gas exhaust accessory (8 705 504
114) to the top of the unit (position 1) using the 4
screws and gasket provided, and fully insert 3"
stainless steel vent pipe into the accessory and
tighten the clamp (position 2).
B Attach the combustion air inlet accessory (8 705
504 115) to the top of the unit (position 3) using the
3 screws and gasket provided, and fully insert 3"
combustion air pipe into the accessory and tighten
the clamp (position 4). NOTE: The appliance has the
possibility to mount the combustion air inlet
accessory on the top right or on the top left side of
the heater. The combustion air inlet that is not used
must be kept sealed.
Appliance details
11
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