Altitude Considerations - Majestic 490IDVNV Installation And Operating Instructions Manual

VENT INSTALLATION

ALTITUDE CONSIDERATIONS

This heater has been tested at altitudes ranging from sea level to 4,500 feet (USA), 0-2000 feet (Canada). In this testing,
heater with standard orifice burns correctly with just an air shutter adjustment. If you need to resize orifice for use at high
altitude, contact your dealer.
(centered on unit)
Inlet
14
Failure to adjust air shutter properly may lead to
improper combustion which can create a safety
hazard. Consult your dealer or installer if you
suspect an improperly adjusted air shutter
Exhaust
Figure 7 - Connecting Exhaust Pipe to Heater
490 Unit - 4" and 3" UL
1777 Gas Liner
380 Unit - 3" and 3" UL
1777 Gas Liner
Apply high-temperature silicone
to lines on both ends and
secure with two (2) screws.
Termination Kit
490 Unit - AI42TK43A
380 Unit - AI31TK33A
57D0215