Bosch Appliances GWH-635-ES Water Heater User Manual


 
6 720 607 072
8
Appliance details
2.6 Clearances
The GWH-635-ES is design certified for installation on
a combustible wall (see 2.7 Mounting installation)
provided the floor covering below the heater is
noncombustible. For installations in an alcove or closet,
maintain the minimum clearances to combustible and
non-combustible materials listed below. See also Fig. 6.
A. Top 12 inches (306 mm)
B. Front 4 inches (102 mm)
C. Back 0 inches
D. Sides 4 inches (102 mm)
E. Bottom 12 inches (306 mm)
Clearances from any exhaust vent pipe are dependent
upon the clearance requirements of the stainless steel
vent pipe manufacturer. Single wall stainless steel
(AL29-4C) vent pipe (vent type rated for Category III
appliances) must be used when exhaust venting this
appliance. See 2.9 Venting.
2.7 Mounting installation
The GWH-635-ES is design certified for mounting on a
wall. Secure the wall mounting bracket provided with
the heater to a wall surface. See Fig. 7.
Do not install this appliance on a carpeted wall or over
floor covering which is combustible, such as carpet.
The heater must be mounted on a wall using
appropriate anchoring materials.
If the mounting bracket is unable to line up on two wall
studs it is recommended that support board(s), either
1x4's or ½" (minimum) plywood first be attached across
a pair of studs and then the heater should be attached
to the support boards. The heater should be kept level
on the wall surface. See Fig. 7.
Expansion and contraction of piping due to changing
water temperature in the pipes imparts movement to the
heater which, if mounted directly to a brittle, friable
board, such as plasterboard, can cause failure of
mounting.
Before installing the unit, be certain you have the
correct heater for your type of Gas - Propane or
Natural Gas. Identification labels are found on the
shipping box, and on the rating plate which is located on
the right side panel of the cover.
Fig. 7 Mounting the heater
2.8 Combustion air requirements
The GWH-635-ES is a sealed water heater and it is
recommended that outdoor combustion air be piped to
the unit. When combustion air is piped to the unit
(TWIN PIPE SYSTEM) the combustion air pipe system
may be constructed of either 3" PVC, aluminum or
galvanized pipe. See Fig. 11, 12 and 13. Select a point
for building penetration being sure that the necessary
clearance on the outside of the building, between the
combustion air pipe and the exhaust vent terminator of
the appliance, can be maintained, see Fig. 16. NOTE:
Observe all local building codes when penetrating a
building wall.
NOTE: The combustion air inlet location on the
side of a building must never be less than 3 feet
away from the units exhaust vent terminator, see
Fig. 16 Table 3.
The heater has the ability to operate without
combustion air being piped to it from the outside,
provided there is an adequate amount of combustion air
available in the room area. Observe the following
instructions concerning combustion air when following
the SINGLE PIPE (exhaust venting only) SYSTEM only
and follow Fig. 14 and 15 for proper setup.
Appliances located in unconfined spaces:
a) An unconfined space is one whose volume is
greater than 50 cubic feet (1.42 cubic meter) per
1000 Btu per hour (292.81 Watts) of the
combined rating of all appliances installed in the
space. That would be 8750 cubic feet (247.8
cubic meter) for the GWH-635-ES alone.
Warning: before starting installation:
B check that there are no loose parts
inside the appliance
B ensure that gas pipe, gas valve, mixer,
fan and burner have no damage and are
properly fitted.
i
Front cover should be removed (see
instructions on page 4) in order to inspect
components visually.