install unit in system where voltage may fluctuate above or below
permissible limits.
NOTE:
Use copper wire only between disconnect switch and
unit.
NOTE:
Install branch circuit disconnect of adequate size per
NEC to handle unit starting current. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
ROUTE GROUND AND POWER WIRES
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes. Failure to follow this warning can result in an
electric shock, fire, or death.
CONNECT GROUND AND POWER WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 9.
Fig. 6—Liquid-Line Filter Drier
A99331
CONNECTOR
TUBE
LIQUID-LINE
FILTER-DRYER
Table 1—Refrigerant Connections and Recommended Liquid Line and Vapor Tube Diameters (In.)
UNIT
SIZE
LIQUID
VAPOR
VAPOR (LONG LINE)
Connection Diameter
Tube Diameter
Connection Diameter
Tube Diameter
Connection Diameter
Tube Diameter
018, 024
3/8
3/8
5/8
5/8
5/8
3/4
030, 036
3/8
3/8
3/4
3/4
3/4
7/8
042, 048
3/8
3/8
7/8
7/8
7/8
1-1/8
060
3/8
3/8
7/8
1-1/8
7/8
1-1/8
NOTES:
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft horizontal, or greater than 20 ft vertical differential, consult the Application Guideline
and Service Manual — Air Conditioners and Heat Pumps Using Puron® Refrigerant.
2. Do not apply capillary tube indoor coils to these units.
Table 2—Accessory Usage
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(OVER 50 FT)
REQUIRED FOR
SEA COAST
APPLICATIONS
(WITHIN 2 MILES)
Crankcase Heater
Yes
Yes
No
Evaporator Freeze Thermostat
Yes
No
No
Winter Start Control
Yes†
No
No
Accumulator
No
No
No
Compressor Start Assist
Capacitor and Relay
Yes
Yes
No
MotorMaster® Control,
or
Low-Ambient Pressure Switch
Yes
No
No
Wind Baffle
See low-ambient instructions
No
No
Coastal Filter
No
No
Yes
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
No
See Long-Line
Application
Guideline
No
Ball Bearing Fan Motor
Yes‡
No
No
* For tubing line sets between 50 and 175 ft, refer to Application Guideline and Service Manual — Air Conditioners and Heat Pumps Using Puron® Refrigerant.
† Only when low-pressure switch is used.
‡ Required for low-ambient controller (full modulation feature) and MotorMaster® Control only.
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