CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain line
from the 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 56" 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 scroll compres-
sor and the economizer. If you want to control the
economizer on a second stage of cooling, use a
thermostat with two stages of cooling.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the National
Electrical Code (NEC) ANSI/NFPA 70 (in USA), current Canadian
Electric Code (CEC) C22.1 (in Canada) and/or local
ordinances. The unit must be electrically grounded in
accordance with the NEC and CEC (as specified above) and/or
local codes. Voltage tolerances which must be maintained at
the scroll compressor terminals during starting and running
conditions are indicated on the unit Rating Plate and Table 1.
The wiring harness furnished with this unit is an integral part of
a UL and CGA design certified unit. Field alteration to comply
with electrical codes should not be required.
A 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 3, 4 and 5 ton
direct-drive units. The 6 ton direct-drive unit has a single speed
blower motor. The speed selection for the 3, 4 and 5 ton
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.
All direct-drive units are shipped with the black wire (labeled
#8) connected to the high speed tap on the blower motor. If a
lower blower motor speed is desired, this wire should be moved
to the medium or low speed tap on the motor.
SCROLL COMPRESSOR
These units are shipped with the scroll compressor mountings
factory-adjusted and ready for operation.
CAUTION: Do Not loosen the scroll compressor mounting bolts.
FIG. 2 - RECOMMENDED DRAIN PIPING
MODELS
UNIT SIZE
036
048
060
072
EVAP.
BLOWER
CENTRIFUGAL BLOWER (Dia. x Wd. in.)
FAN MOTOR HP (Direct-Drive)
FAN MOTOR HP (Belt-Drive)
12 x 10
1
⁄
2
1
1
⁄
2
12 x 10
3
⁄
4
1
1
⁄
2
12 x 10
1
1
1
⁄
2
12 x 11
1
1
1
⁄
2
EVAP.
COIL
ROWS DEEP
FINS PER INCH
FACE AREA (Sq. Ft.)
3
13
3.6
3
13
4.3
3
13
5.1
4
13
5.1
COMPR.
TYPE
HERMETICALLY SEALED (Qty. = 1)
BRISTOL SCROLL
COND.
FAN
PROPELLER DIA. (in.)
FAN MOTOR HP
NOM. CFM TOTAL
24
1
⁄
4
3,400
24
1
⁄
4
3,400
24
1
⁄
4
3,400
24
1
⁄
4
3,300
COND.
COIL
ROWS DEEP
FINS PER INCH
FACE AREA (Sq. Ft.)
1
16
17.1
1
16
17.1
1
22
17.1
2
16
16.7
AIR
FILTERS
(SEE NOTE)
QUANTITY PER UNIT (15" x 20" x 1")
QUANTITY PER UNIT (14" X 25" X 1")
TOTAL FACE AREA (sq. ft.)
2
1
6.3
2
1
6.3
2
1
6.3
2
1
6.3
CHARGE
REFRIGERANT 22 (lbs./oz.)
5/8
6/8
6/8
10/0
TABLE 2 - PHYSICAL DATA
WEIGHTS (LBS)
Basic Unit
3 Ton
515
4 Ton
565
5 Ton
590
6 Ton
670
ACCESSORIES / OPTIONS
Electric Heat
(Nominal KW)
5 - 7 KW
18
10 - 15 KW
23
20 - 30 KW
28
Economizer
50
Motorized Outdoor
Air Damper
26
Relief/Fixed
Air Damper
10
Roof Mounting Curb
92
Belt-Drive Blower
5
530.18-N7Y
4
Unitary Products Group
