Laars Mighty Max VW Series, Installation, Operation And Maintenance Instructions

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Page 14
LAARS HEATING SYSTEMS
Do not locate the air inlet terminal near a source
of corrosive chemical fumes (e.g., cleaning fluid,
chlorine compounds, etc.). Locate it so that it will not
be subject to damage by accident or vandalism. It
must be at least 7 feet (2.1m) above a public walkway.
Use single-wall galvanized pipe for the
combustion air duct. Route the duct to the heater as
directly as possible. Seal all joints with tape. Provide
adequate hangers. The heater must not support the
weight of the combustion air duct.
When combustion air is ducted to the heater,
other provisions must be made for heater room
ventilation. VW heaters lose less than 1 percent of
their input rating to the room, but other heat sources
may be present. Provide enough ventilation air to meet
comfort specifications. Make sure the ventilation air is
not directed at the heater, water piping or other
equipment which could be damaged by freezing.
2K-3. Conversion for Ducted
Combustion Air
The conversion to ducted combustion air
requires the parts listed in Table 8. Follow these
procedures to convert the heater (see Figure 10):
1.
Remove the louvered plate from the left side of
the heater.
2. Remove the adapter plate from the shipping
container.
3. Install the blower motor housing collar in gasket.
4. Slip one end of the inlet pipe over the collar on
the adapter plate.
5. Slide the inlet pipe and adapter plate into the
heater opening until the pipe is aligned with the
blower motor.
6. Slip the end of the inlet pipe over the blower
motor housing collar.
7. Secure the adapter plate to the side of the heater
with the 4 screws.
Vent Terminal
6 ft. (1.8 m) Min.
Forced Air
Inlet
Grade
Less Than
10 ft. (3.0 m)
Vent Terminal
3 ft. (0.9 m) Min.
4 ft. (1.2 m) Min.
4 ft. (1.2 m) Min.
Vent
Terminal
12 in. (305mm) Min.
Figure 9. Building Exterior.