CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain line
from the 19mm (
3
⁄
4
“) PVC female connection on the unit to spill
into an open drain.
NOTE: The condensate drain line MUST be trapped to pro-
vide proper drainage. See Figure 2.
SERVICE ACCESS
Access to all serviceable components is provided by the
following removable panels:
•
Compressor compartment
•
Heater compartment
•
Blower compartment
•
Main control box
•
Filter compartment
•
Motor Access (on units w/belt-drive option)
Refer to Figure 5 for location of these access panels.
CAUTION: Make sure that all screws are replaced on the
unit to maintain an air-tight seal.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 1422mm (56 in.) above the floor where it will not
be subject to drafts, sun exposure, or heat from electrical
fixtures or appliances. Follow manufacturer’s instructions
enclosed with thermostat for general installation procedure.
Color coded insulated wires (#18 AWG) should be used to
connect thermostat to unit. See Figure 4 for wiring details.
NOTE: If the unit has an economizer, remove jumper J1
from terminals 8 and 10 on the relay board to pre-
vent simultaneous operation of the compressor and
the economizer. If you want to control the econo-
mizer on a second stage of cooling, use a thermo-
stat with two stages of cooling.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to the applicable national and
local or municipal codes.
Voltage tolerances which must be maintained at the
compressor terminals during starting and running conditions
are indicated on the unit Rating Plate and Table 1.
The internal wiring harness furnished with this unit is an integral
part of the unit. Field alteration to comply with electrical codes
should not be required.
A fused disconnect switch should be field provided for the unit.
The switch must be separate from all other circuits. Refer to Figure
5 for installation location. 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 lines must be sized properly to carry the load. USE
COPPER CONDUCTORS ONLY. Each unit must be wired with
a separate branch circuit fed directly from the meter panel and
properly protected.
CAUTION: When connecting electrical power and control
wiring to the unit, waterproof type connectors
MUST BE USED so that water or moisture can-
not be drawn into the unit during normal opera-
tion. The above waterproofing conditions will
also apply when installing a field-supplied discon-
nect switch.
Refer to Figure 4 for typical field wiring and to the appropriate
unit wiring diagram for control circuit and power wiring
information.
BLOWER SPEED SELECTION
Three blower motor speeds are available on the direct-drive
units. The speed selection for the direct-drive units is
determined by the CFM and ESP requirements of the
applications. All units with belt-drive option have an adjustable
motor pulley to achieve the above conditions.
COMPRESSORS
The compressor in the 036, 048 and 060 units is mounted on
springs which have been tightened down for shipment only.
After the unit is installed, back out the compressor bolts until
the sleeve clears the top grommet.
The 076 units are shipped with compressor mountings
factory-adjusted and ready for operation.
CAUTION: Do not loosen compressor mounting bolts.
76mm (3")
51mm (2")
FIG. 2 - RECOMMENDED DRAIN PIPING
WEIGHTS (kg/lbs)
Basic Unit
036
249 / 550
048
268 / 590
060
286 / 630
076
313 / 690
ACCESSORIES / OPTIONS
Electric Heat
(Nominal KW)
5 - 7 KW
8 / 18
10 - 15 KW
10 / 23
20 - 30 KW
13 / 28
Economizer
23 / 50
Motorized Outdoor
Air Damper
22 / 48
Relief/Fixed
Air Damper
5 / 10
Roof Mounting Curb
42 / 92
MODELS
DCE
036
048
060
076
Evaporator
Blower
Centrifugal Blower (Dia. x Wd.
mm
(in.))
Fan Motor HP (direct-drive)
Fan Motor HP (Belt-Drive)
305 x 254
(12 x 10)
1
⁄
2
N/A
305 x 254
(12 x 10)
3
⁄
4
N/A
305 x 254
(12 x 10)
N/A
1.5
305 x 279
(12 x 11)
N/A
1.5
Evaporator
Coil
Rows Deep
Fins Per 25mm (1 in.)
Face Area (m
2
/ft
2
)
3
13
0.33 / 3.6
3
13
0.40 / 4.3
3
13
0.48 / 5.1
3
13
0.48 / 5.1
Condensor
Fan
Propeller Dia. (mm/in.)
Fan Motor HP
Nom. CFM Total
610 / 24
1
⁄
2
4,500
610 / 24
1
⁄
2
4,500
610 / 24
1
⁄
2
4,500
610 / 24
1
⁄
2
4,500
Condensor
Coil
Rows Deep
Fins Per 25mm (1 in.)
Face Area (ft
2
/m
2
)
1
16
1.60 / 17.1
1
19
11.60 / 17.1
1
22
1.60 / 17.1
2
16
1.55 / 16.7
Air
Filters
(SEE NOTE)
Quantity Per Unit (14" X 20" X 1")
Quantity Per Unit (14" X 25" X 1")
Total Face Area (m
2
/ft
2
)
2
1
0.59 / 6.3
2
1
0.59 / 6.3
2
1
0.59 / 6.3
2
1
0.59 / 6.3
Charge
Refrigerant 22 (kg / lbs./oz.)
2.72 / 6/0
3 / 6/10
3.3 / 7/4
4.9 / 10/12
NOTE: Filter racks are adapted for 25mm (1 in.) or 51mm (2 in.) thick filters.
TABLE 2 - PHYSICAL DATA
530.26-N1YI
4
Unitary Products Group
