Laars HWG-M2-150 Installation, Operation And Maintenance Instructions - page 5
9600 HWG Water Heater
Page 5
2C. Locating Vent Openings on Outside Wall
1.
Exhaust terminal location.
The exhaust terminal fitting requires a 4" (10cm)
diameter hole through the outside wall. The
center line of this opening must be at least 16"
(41cm) above grade and at least 14" (35.6cm)
from any other building opening such as doors,
windows, etc.
Vent opening should be well away from
shrubbery or other obstructions that would block
or restrict the exhaust.
Whenever possible, locations under windows or
near doors should be avoided. Steaming at the
flue terminal is a normal occurrence. This should
be considered when deciding flue terminal
position.
2.
Intake terminal location.
The intake terminal requires a separate 4" (10cm)
diameter hole to install the intake fitting. The
center line of the hole should be at least 16"
(41cm) above grade outdoors and 18" (46cm)
away from the exhaust outlet. The intake should
never be located above the exhaust terminal.
3.
Intake and exhaust location for multiple unit
installation. For the installations of multiple
units, refer to Figure 4 for intake and exhaust
terminal locations.
2D. Locating Unit for Proper Vent Height
The vent locations you select must permit direct
pipe runs to the terminal from the boiler. Since the
9600 HWG Water Heater is designed to drain any
water that collects in the vent, it is important that you
do not build any traps or low points into the vent
where water could collect and restrict the vent. It is
recommended that 1/4" per foot of vent be built into
the vent system to direct any water in the vent back
toward the boiler. Note that standard DWV elbows
have a built in allowance for the required 1/4" per foot
pitch.
2E. Locating Unit with Respect to Ventilation
While the 9600 HWG Water Heater requires no
indoor air for combustion, adequate airflow around the
unit must be provided for proper cooling of electrical
components.
2F. Locating Unit with Respect to
Storage Tanks
For the best results the 9600 HWG Water Heater
should be located within 10 feet of the storage tanks.
If the unit must be installed with longer piping
runs, then the larger diameter tubing must be used.
Calculate the necessary pipe size for your installation
(see Table 2).
SECTION 3.
Installation
3A. Installing Vent Piping Terminal
The water heater is provided with intake and
exhaust terminals for use with 3" diameter plastic
pipe.
The installer is responsible for obtaining the vent
pipe and fittings. The maximum combined length of
the intake and exhaust pipe and maximum number of
elbows are determined by using the guidelines on Page
4.
The following steps are recommended for vent
installation:
1.
Obtain the necessary 3" or 4" diameter plastic
piping and fittings as determined beforehand.
2.
Position unit at previously selected location.
3.
Unpack vent terminals and vent terminal backing
plates.
4.
Cut holes in outside wall for vent terminals in the
previously selected locations.
5.
Mount the vent terminals backing plates.
6.
Fit all of the vent pipes together without
cementing. Make sure that there are no water
traps and that any pitch is inclined back towards
the boiler.
7.
Make sure that the flexible vent connections at
the unit fit properly.
8.
Begin cementing the intake and exhaust pipes,
start at the vent terminals and work back towards
the appliance. Note that the intake terminal is a
90 degree elbow fitting that is designed to face
down.
9.
Support both intake and exhaust pipes with
hangers.
DO NOT RELY ON 9600 HWG TO SUPPORT
PIPES.
Horizontal runs must be supported adjacent to
each fitting and at 5ft. intervals between fittings.
ABS pipe must be supported at 3ft. intervals.
10. Tighten the flexible couplings to connect the
water heater to the vent pipes.
Figure 4. Multiple units minimum vent terminal
separation.
EXHAUST
INTAKE