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MAXUS DIRECT VENT HEATER
1. High Altitude Installation
For U.S. installation, appliances are tested and approved for elevations from 0-2000 ft. When installing this appliance
at an elevation above 2000 ft, National fuel gas codes require a decrease of the input rating by changing the existing
burner orifice to a smaller size. Input should be reduced 4% for each 1000 ft above sea level. Check with the local
gas utility for proper orifice size identification. The correct orifice is available from your Heatilator distributor.
For Canada, appliances are certified for elevations from 0-4500 ft. When installing this appliance at an elevation
between 0-4500 ft in Canada, the input rating does not need to be reduced. When installing this appliance at an
elevation above 4500 ft in Canada, check with local authorities.
2. Connect the Gas Line
Open the control access panel as shown in Figure 33. The appliance is provided with a stainless steel flexible
connector and a listed (and Commonwealth of Massachusetts approved) T-handle manual shutoff valve. The
incoming gas line should be piped into the valve compartment and connected to the 1/2 in. FIP connection provided
on the manual shutoff valve. See Figure 34 to connect the gas line. Optional: Seal around the gas line to prevent cold
air leakage.
All connections must be tightened and checked for leaks with a commercially available, non-corrosive leak check
solution. Be sure to rinse off the solution when done leak testing.
Bleed the gas line to extract any air that may have been trapped inside the pipe.
Upon completing the gas line connection, a small amount of air will be in the lines. When first lighting the pilot light,
it will take a few minutes for the lines to purge themselves of this air. Once the purging is complete, the pilot and
burner will light and operate.
Subsequent lighting of the appliance will not require such purging.
Note:
Have the gas supply line installed in
accordance with building codes by a qualified
installer approved and/or licensed as required by
the
locality.
In
Massachusetts, installation must be performed by
a licensed plumber or gas fitter.
CAUTION:
(Standing Pilot Ignition) During the initial purging
and subsequent lighting, NEVER allow the gas
valve control knob to remain depressed in the
"pilot" position without pushing the red ignitor
button at least once every second.
Note:
This appliance and its manual shutoff valve
must be disconnected from the gas supply piping
system during any pressure testing of that system
at test pressures in excess of 1/2 psi (3.5 kPa). The
appliance must be isolated from the gas supply
piping system by closing its manual shutoff valve
during any pressure testing of the gas supply pip-
ing system at test pressures equal to or less than
1/2 psi (3.5 kPa).
09/04
F. UTILITIES
the
Commonwealth
of
Control
Access
Panel
Figure 33
Control Access Panel
Figure 34
Gas Line
30484 Rev Q
23
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