Table of Contents
Advertisement
→ Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
UNIT
SIZE
Connection Diameter
018, 024
3/8
030, 036
3/8
042, 048
3/8
060
3/8
NOTES:
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Residential Long-Line Application Guideline.
2. Do not apply capillary tube indoor coils to these units.
To prevent damage to unit or service valves observe the
following:
• Use a brazing shield.
• Wrap service valves with wet cloth or use a heat sink
material.
→
Outdoor units may be connected to indoor unit using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 50 ft, substan-
tial capacity and performance losses can occur. Following the
recommendations in the Residential Split System Long-Line
Application Guideline will reduce these losses. Refer to Table 1
for field tubing equivalent line length. Refer to Table 2 for
accessory requirements.
→
For buried-line applications greater than 36 in., refer to Table 2
and Residential Split System Buried-Line Application Guideline.
Buried line applications may not exceed 100 ft.
If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED
INDOOR UNIT
Outdoor unit contains correct system refrigerant charge for opera-
tion with indoor unit of same size when connected by 15 ft of
field-supplied or factory-accessory tubing. Check refrigerant
charge for maximum efficiency.
ACCESSORY
Crankcase Heater
Evaporator Freeze Thermostat
Winter Start Control
Accumulator
Compressor Start Assist
Capacitor and Relay
Low-Ambient Controller,
MotorMaster® Control,
or
Low-Ambient Pressure Switch
Wind Baffle
Coastal Filter
Unit Risers
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
Ball Bearing Fan Motor
* For tubing line sets between 50 and 175 ft, refer to Residential Split System Long-Line Application Guideline.
† For buried line applications, refer to Residential Split System Buried-Line Application Guideline.
‡ Only when low-pressure switch is used.
** Required for Low-Ambient Controller (full modulation feature) and MotorMaster Control only.
LIQUID
Tube Diameter
Connection Diameter
3/8
3/8
3/8
3/8
→ Table 2—Accessory Usage
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
Yes
Yes
Yes‡
No
Yes
Yes
See Low-Ambient Instructions
No
Recommended
No
Yes**
VAPOR
Tube Diameter
5/8
5/8
3/4
3/4
7/8
7/8
7/8
1-1/8
REFRIGERANT TUBING
Connect tubing to fittings on outdoor unit vapor and liquid service
valves. (See Table 1.) Use refrigerant grade tubing.
SWEAT CONNECTION
To avoid valve damage while brazing, service valves must be
wrapped in a heat-sinking material such as a wet cloth.
Service valves are closed from factory and ready for brazing. After
wrapping service valve with a wet cloth, tubing set can be brazed
to service valve using either silver bearing or non-silver bearing
brazing material. Consult local code requirements. Refrigerant
tubing and indoor coil are now ready for leak testing. This check
should include all field and factory joints.
Step 7—Make Electrical Connections
To avoid personal injury or death, do not supply power to unit
with compressor terminal box cover removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(OVER 50 FT)
Yes
No
No
No
Yes
No
No
No
No
See Long-Line
Application
Guideline
No
3
VAPOR (LONG LINE)
Connection Diameter
Tube Diameter
5/8
3/4
7/8
1-1/8
7/8
1-1/8
REQUIRED FOR
REQUIRED FOR
BURIED LINE
SEA COAST
APPLICATIONS†
APPLICATIONS
(OVER 3 FT)
(WITHIN 2 MILES)
Yes
No
No
Yes
Yes
No
No
No
No
Recommended
Yes
No
3/4
7/8
No
No
No
No
No
No
No
Yes
No
No
Advertisement
Table of Contents
