341849-YIM-A-0108
Johnson Controls Unitary Products 5
DUCTWORK
These units are adaptable to downflow use as well as
rear supply and return air duct openings. To convert to
downflow, use the following steps:
1. Remove the duct covers found in the bottom return
and supply air duct openings. There are four (4)
screws securing each duct cover (save these screws
to use later).
2. Install the duct covers, removed in step one, to the
rear supply and return air duct openings. Secure
with the four (4) screws used in step one.
3. Seal duct covers with silicone caulk.
Downflow units must have an “L”-shaped supply duct
without any outlets or registers located below the outlet
of the unit.
Duct work should be designed and sized according to
the methods of the Air Conditioning Contractors of
America (ACCA), as set forth in their Manual D.
A closed return duct system shall be used. This shall
not preclude use of economizers or ventilation air
intake. Flexible joints may be used in the supply and
return duct work to minimize the transmission of noise.
NOTE: Be sure to note supply and return openings.
Refer to Figure 4 for information concerning rear and
bottom supply and return air duct openings.
FILTERS
A filter rack and high velocity filters are standard on
three phase units.
Filters must always be used and must be kept clean.
When filters become dirt laden, insufficient air will be
delivered by the blower, decreasing your units effi-
ciency and increasing operating costs and wear-and-
tear on the unit and controls.
Filters should be checked monthly especially since this
unit is used for both heating and cooling.
CONDENSATE DRAIN
A condensate trap is required to be installed in the con-
densate drain. The plumbing must conform to local
codes. Use a sealing compound on male pipe threads.
Install the condensate drain line (3/4“ NPTF) to spill
into an open drain.
SERVICE ACCESS
Access to all serviceable components is provided by
the following removable panels:
• Blower service access
• Electrical/Filter access
• Compressor service access
Refer to Figure 4 for location of these access panels
and minimum clearances.
THERMOSTAT
The room thermostat should be located on an inside
wall approximately 56" above the floor where it will not
be subject to drafts, sun exposure or heat from electri-
cal fixtures or appliances. Follow manufacturer's
instructions enclosed with the thermostat for general
installation procedure. Six color coded insulated wires
(minimum #18 AWG) should be used to connect ther-
mostat to unit. See Figure 2.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of
the current N.E.C. ANSI/NFPA No. 70 or C.E.C. and/or
local ordinances. The unit must be electrically
grounded in accordance with local codes or, in their
absence, with the N.E.C./C.E.C. Voltage tolerances
which must be maintained at the compressor terminals
during starting and running conditions are indicated on
the unit Rating Plate and Table 4.
The wiring entering the cabinet must be provided with
mechanical strain relief.
A fused disconnect switch should be field provided for
the unit. If any of the wire supplied with the unit must be
replaced, replacement wire must be of the type shown
on the wiring diagram.
Electrical line must be sized properly to carry the load.
Each unit must be wired with a separate branch circuit
fed directly from the meter panel and properly fused.
Refer to Figure 2 for typical field wiring and to the
appropriate unit wiring diagram for control circuit and
power wiring information.
When fastening ductwork to side duct flanges
on unit, insert screws through duct flanges
only. DO NOT insert screws through casing.
Outdoor ductwork must be insulated and
waterproofed.
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