If these furnaces are installed in an unconditioned space
where ambient temperatures may be 32°F or lower, freeze
protection measures must be taken. (See Fig. 16.) Failure to
follow this caution will result in minor property or unit
damage.
Step 2—Low-Heat Only Installation
This 58MVP furnace can be installed to operate in the low-heat
only heating mode when sized using the low-heat heating capacity.
This is accomplished by placing setup switch SW1-2 in the ON
position to provide only low-heat operation. See Fig. 32 and Table
9. With this setup, high-heat operation will not occur.
When the model no. on the furnace rating plate is followed by an
asterisk (*), the furnace has an alternate low-heat only efficiency
rating as listed in the GAMA and CEC directories. This alternate
rating will be listed as the furnace model number followed by an
(-L) suffix.
The furnace can operate in the high-heat mode when certain
fault conditions occur. The following precautions should be
taken:
1.Size gas piping based on the high-heat input.
2.Check the high-heat input and adjust it per the main
literature instructions.
NEVER assume the high-heat input rate is not important for
low-heat-only installation.
Step 3—Furnace Location Relative to Cooling
Equipment
The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchanger. When
installed parallel with a furnace, dampers or other means used to
control flow of air shall be adequate to prevent chilled air from
entering furnace. If dampers are manually operated, they must be
equipped with a means to prevent operation of either unit unless
damper is in full-heat or full-cool position.
Step 4—Hazardous Locations
Fig. 15—Prohibit Installation on Back
A93043
FRONT
BACK
FRONT
B
A
C
K
Fig. 16—Freeze Protection
A93058
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
When furnace is installed in a residential garage, it must be
installed so that burners and ignition sources are located a
minimum of 18 in. above floor. The furnace must be located
or protected to avoid physical damage by vehicles. When
furnace is installed in a public garage, airplane hangar, or
other building having a hazardous atmosphere, unit must be
installed in accordance with requirements of National Fire
Protection Association, Inc. (See Fig. 17.)
A93044
Fig. 17—Installation in a Garage
18-IN. MINIMUM
TO BURNERS
14
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