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ML180UHA Gas Furnace
The ML180UHA unit is shipped ready for use with Natural
gas (LP/Propane changeover kits available), and for instal
lation in the upflow or horizontal right position (for horizon
tal left position the combustion air pressure switch must
be moved). The furnace is shipped with the bottom panel
in place. The bottom panel must be removed if the unit is to
be installed in a horizontal application. The panel may
also be removed in upflow applications with bottom return
air.
Shipping and Packing List
Package 1 of 1 contains
1 - Assembled ML180UHA unit
1 - Bag assembly containing the following:
2 - Screws
1 - Snap bushing
1 - Snap plug
1 - Wire tie
1 - Vent warning label
1 - Owner's manual
1 - Bag assembly containing the following:
1 - 2.5 m Power cord
The following items may be ordered separately:
1 - Thermostat
1 - Suspension kit (for horizontal installations)
1 - Propane/LP changeover kit
1 - Return air base
1 - High altitude kit
1 - Side filter kit
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
Requirements
The ML180UHA furnace is approved for installation for in
side of building only, with clearances as listed in figure 6.
(Accessibility and service clearances must NOT take pre
cedence over fire protection clearances). Installation of
Lennox forced air central furnaces must be in accordance
with these instructions, local gas fitting regulations, munici
pal building codes, electrical wiring regulations and the cur
rent edition of the Australian Gas Installation Code (AS/
NZS5601).
The acceptable natural gas Wobbe number values for use
with Lennox furnaces are shown in Table 1.
Min
Wobbe
46.95 mj / m
Number*
(1260 Btu / ft
Gas Properties 101.3 kPa, 15° C Dry bulb
(14.73 psia, 60° F Dry Bulb)
* Wobbe number = heating value
square root of specific
gravity
If you need to know whether a gas is acceptable, request
the Wobbe number from your gas supplier and compare to
the chart. If the number is within the ranges listed for Natu
ral gas, the gas is acceptable to use. If the Wobbe number
is outside the acceptable ranges, the gas is not acceptable
to use.
As LP (Propane) is a regulated/manufactured gas, a
Wobbe number is not required to determine acceptability.
For propane installations, the acceptable heating value
range is 93.2 MJ / m
NOTE - Lennox does not recommend using unrefined or
"well head" gas on Lennox gas-fired furnaces. The quality
of gas is not controlled and may have contaminants which
may lead to corrosion, premature heat exchanger failure or
may void the equipment warranty. The information pro
vided above is intended for evaluating fuel gases available
commercially through gas utilities or LP (propane) suppli
ers.
Adequate clearance must be made around the air open
ings into the vestibule area. Provisions shall be made for
proper operation and for combustion air and ventilation air
supply according to the current edition of the Australian
Gas Installation Code (AS/NZS5601).
NOTE - For installation on combustible floors, the furnace
shall not be installed directly on carpeting, tile, or other
combustible material other than wood flooring.
For installation in a residential garage, the furnace must
be installed so that the burner(s) and the ignition source
are located no less than 457 mm (18 in) above the floor.
The furnace must be located or protected to avoid physi
cal damage by vehicles. When a furnace is installed in a
public garage, hangar, or other building that has a hazard
ous atmosphere, the furnace must be installed according
to recommended good practice requirements and current
edition of the Australian Gas Installation Code (AS/
NZS5601).
Unit must be adjusted to obtain a temperature rise within
the range specified on appliance rating plate.
This ML180UHA furnace must be installed so that its elec
trical components are protected from water.
Page 3
TABLE 1
Normal
3
3
50.15 mj / m
53.28 mj / m
3
3
)
(1346 Btu / ft
)
(1430 Btu / ft
3
3
(2500 btu/ft
) +/- 5%.
Max
3
3
)
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