Specifications

177008-YIM-A-0406
Unitary Products Group 23
Check all connections for leaks when piping is completed using
a soap solution. NEVER USE A FLAME.
Vent And Combustion Air Hoods
The vent hood and combustion air hood (with screens) are
shipped attached to the blower housing in the blower
compartment. These hoods must be installed to assure proper
unit function. All hoods must be fastened to the outside of the
gas heat access panel with the screws provided in the bag also
attached to the blower housing.
The screen for the combustion air intake hood is secured to the
inside of the access panel opening with three fasteners and the
screws used for mounting the hood to the panel. The top flange of
this hood slips in under the top of the access panel opening when
installing. Refer to Vent and Combustion Air Hood Figure 16.
The vent hood is installed by inserting the top flange of the hood
into the slotted opening in the access panel and securing in place.
The products of combustion are discharged horizontally through
this screened, hooded vent opening on the gas heat access panel.
Figure 16: Vent And Combustion Air Hood
Options/Accessories
Electric Heat
Electric heaters are available as factory-installed options or
field-installed accessories. Refer to electric heat instructions for
installation. These heaters mount in the heat compartment with
the heating elements extending into the supply air chamber. All
electric heaters are fused and intended for use with single point
power supply.
Economizer/Motorized Damper and Rain Hood
The instruction for the optional economizer/motorized damper
and rain hood can be found in form 035-07364-000. Use these
instructions when field assembling an economizer rain hood
onto a unit. The outdoor and return air dampers, the damper
actuator, the damper linkage, the outdoor and return air divider
baffles, and all the control sensors are factory mounted as part
of the “Factory installed” economizer/motorized damper options.
Power Exhaust/barometric Relief Damper and Rain Hood
The instructions for the power exhaust/barometric relief damper
and rain hood can be found in form 530.18-N1.10V.
All of the components, including the dampers, hardware, and
mounting instructions are shipped in a single package external
from the unit and must be field assembled and installed.
Power exhaust is only available as a field installed accessory.
Economizer And Power Exhaust Set Point
Adjustments
Remove the top rear access panel from the unit. Locate the
economizer control module, where the following adjustments
will be made.
Minimum Position Adjustment
• Check that the damper blades move smoothly without
binding; carefully turn the Minimum Position Adjust screw
(found on the damper control module) fully clockwise and
then set the thermostat indoor fan switch to the ON
position and then OFF or energize and de-energize
terminals “R” to “G”.
LP gas is an excellent solvent and will quickly dissolve
white lead and most standard commercial compounds. A
special pipe dope must be used when assembling
wrought iron or steel pipe for LP. Shellac base compounds
such as Gaskolac or Stalastic, and compounds such as
Rectorseal #5, Clyde’s, or John Crane may be used.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
An adhesive backed label is provided over the outside of
the combustion air inlet opening to prevent moisture
from entering the unit, which could cause damage to
electrical components. Allow this closure label to remain
in place until the combustion air hood is to be installed.
Extreme care must be exercised in turning all set point,
maximum and minimum damper positioning adjustment
screws to prevent twisting them off.