6
OUTER FLANGE
STARTER FLANGE
SQUARE TO ROUND
DUCT CONVERTER PANEL
FIGURE 3
flanges of the square duct openings. The flexible duct is then clamped on to the collars. Once the duct is affixed to the
unit,
seal the collars and flanges with a proper waterproof sealant
(See Figure 3).
It is strongly encouraged to use appropriately sized ducts based upon the CFM for your application (unit’s CFM). If duct
sizing through industry manuals or air duct calculators require larger ducts than converter openings, run larger duct size
up to unit converter openings and reduce with a reducer duct fitting or transition right at the unit.
Plenum Application
A suitable plenum or square duct must be constructed. The duct cross-sectional area should be determined by industry
duct sizing manuals or air duct calculators.
On ductwork exposed to outside air conditions of temperature and humidity, use an insulation with a good K factor, and
a vapor barrier. Industry practices should be followed. Balancing dampers are recommended for each branch duct in the
supply system. Ductwork should be properly supported from the unit.
NOTE: Proper sealing of all duct work and air handling compartments
is extremely important to overall unit efficiency.
Filters
Filters are not provided with unit, and must be supplied and installed
in the return duct system by the installer. A field installed filter grille
is recommended for easy and convenient access to the filters for
periodic inspection and cleaning. Filters must have adequate face
area for the rated quantity of the unit. See air delivery tables (Figure
4) for recommended filter size.
PIPING
Condensate Drain
The condensate drain connection of the evaporator is a half
coupling of ¾” N.P.T. A trap must be provided to have Proper
condensate drainage.
Install condensate drain trap as shown. Use ¾ “ drain
connection size or larger. Do not operate without trap. Unit must be level or slightly inclined toward drain.
WIRING
All wiring should be made in accordance with the National
Electrical Code.
The local Power Company should be
consulted to determine the availability of sufficient power
to operate the unit. The voltage, frequency, and phase at
the power supply should be checked to make sure it
corresponds to the unit’s RATED VOLTAGE REQUIREMENT.
Install a branch circuit fused disconnect near the unit, in
accordance with the N.E.C. or local codes. Wire sizes and
overcurrent protection should be determined from the unit
nameplate ampacity and in accordance with Table 4 (page
7) or the N.E.C. Under no circumstances should wiring be
sized smaller than is recommended by either of these two
sources.
500 1000 1500 2000 2500 3000 3500
7
6
5
4
3
2
DIS
PO
SA
BL
E F
ILT
ER
PER
MAN
ENT
FIL
TER
Airflow - SCFM
N
o
m
in
a
l
F
ilt
e
r
A
re
a
S
q
u
a
re
F
e
e
t
FIGURE 4
2" Minimum
3" Minimum
A Positive Liquid Seal
Is Required
Flexible
Tubing-Hose
Or Pipe
Drain
Connection
Unit
FIGURE 5
CONTACTOR
R
W
G
G R W
FOR INTERNAL WIRING SEE WIRING LABEL ATTACHED TO UNIT
24 VOLT CONTROL WIRING
FIGURE 6
