SWEAT CONNECTION
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.
Braze sweat connections using industry accepted methods and
materials. Do not use soft solder (materials which melt below
800°F). Consult local code requirements.
LEAK CHECKING
Leak test all joints in indoor, outdoor, and refrigerant tubing.
EVACUATE REFRIGERANT TUBING AND INDOOR COIL
Never use the system compressor as a vacuum pump.
Refrigerant tubes and indoor coil must be evacuated to 500
microns.
IMPORTANT:
Never open system under vacuum to atmosphere
without first breaking it open with nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a minimum vacuum of 500 microns and a vacuum gage or
thermistor capable of accurately measuring this vacuum depth. The
deep vacuum method is the most positive way of assuring a system
is free of air and liquid water. (See Fig. 10.)
FINAL TUBING CHECK
IMPORTANT:
Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Step 8—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.
Table 2—Accessory Usage
ACCESSORY
REQUIRED FOR LONG-LINE
APPLICATIONS
*
(OVER 50 FT)
REQUIRED FOR
SEACOAST APPLICATIONS
(WITHIN 2 MILES)
Coastal Filter
No
Yes
Support Feet
No
Recommended
Puron® Balance-Port Hard Shutoff TXV
Yes†
Yes†
Puron® Liquid-Line Solenoid Valve for Heating
KHALS0401LLS
No
* For tubing line sets between 50 and 175 ft horizontal or 20 ft vertical differential refer to Application Guideline and Service Manual—Air Conditioners and Heat Pumps
Using Puron® Refrigerant. Crankcase heater and start assist are standard on two-speed units.
† Required for all applications. Factory supplied with outdoor unit.
Fig. 8—Liquid Service Valve with Sweat Adapter
Tube
A01214
SWEAT/ FLARE
ADAPTER
TEFLON
SEAL
PISTON BODY
LIQUID SERVICE VALVE
PISTON
Fig. 9—Filter Drier with Sweat Adapter Tube and
Liquid Tube
A01215
LIQUID
SERVICE
VALVE
LIQUID-LINE
FILTER-DRIER
Fig. 10—Deep Vacuum Graph
A95424
500
MINUTES
0
1
2
3
4
5
6
7
1000
1500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
A95424
5
