Installation guide

--> Table1--RefrigerantConnectionsand RecommendedLiquidandVaporTubeDiameters(In.)
TUBE DIAMETER
UNIT CONNECTION DIAMETER TUBE DIAMETER (ALTERNATE)
SIZE
Liquid Vapor Liquid Vapor Vapor
018 3/8 5/8 3/8 5/8 3/4
024 3/8 5/8 3/8 5/8 3/4
030 3/8 3/4 3/8 3/4 5/8, 7/8
036 3/8 3/4 3/8 3/4 5/8, 7/8
042, 048 3/8 7/8 3/8 7/8 3/4
060 3/8 7/8 3/8 1-1/8 7/8
Notes:
1. Tube diameters are for lengths up to 50 ft. For tubing tengths greater than 50 ft horizontal and/or 20 ft vertical differential, consult the Application Guideline and Service
Manual--Air Conditioners and Heat Pumps Using Puron® Refrigerant.
2. Refrigerant tubes and indoor coils must be evacuated to 500 microns to minimize contamination and moisture in the system.
3. If required by local codes, Pressure Guard TM kit is available. See Product Data Digest for part numbers.
Table 2--Accessory Usage
REQUIRED FOR LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
REQUIRED FOR LONG-LINE
ACCESSORY APPLICATIONS*
(OVER 50 FT)
Crankcase Heater Yes Yes
Evaporator Freeze Thermostat Yes No
Compressor Start Assist-Capacitor and Relay Yes Yes
Puron® Low-Ambient Pressure Switch Yes No
Wind Baffle See Low-Ambient Instructions No
Support Feet Recommended No
Puron® Hard Shutoff TXV YesIE YesIE
See Long-Line
Puron® Liquid-Line Solenoid Valve for Heating No Application Guideline
* For tubing line sets between 50 and 175 ft, refer to the Application GuideIine and Service Manual--Air Conditioners and Heat Pumps Using Puron® Refrigerant
1 Required for all applications.
SWEAT CONNECTION
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To avoid valve dmnage while brazing, service valves must be
wrapped in a heat-sinking material such as a wet cloth.
Wrap service valves and filter drier with a wet cloth or heat-
sinking material. Braze connections using either silver bearing or
non-silver bearing brazing material. Do not use soft solder
(materials which melt below 800°F). Consult local code reqnire-
lilents.
LEAK CHECKING
Leak test all joints in indoor, outdoor, and refrigerant robing.
EVACUATE REFRIGERANT TUBING AND INDOOR (:OIL
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To avoid compressor damage, never use the system compres-
sor as a vacuum pump.
Refrigerant robes and indoor coil must be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed.
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 vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum
method is the most positive way of assuring a system is fi'ee of air
and liquid water. (See Fig. i0.)
50OO
4500
4000
3500
3000
2500
2000
1500
1000
500
LEAKIN
SYSTEM
Niiiiii ,
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0 1 2 3 4 5 6 7
MINUTES
A95424
Fig. 10--Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation method should be used when vacuum pump
is only capable of pumping down to 28 in. of mercury vacuum and
system does not contain any liquid water. Refer to Fig. 11 and
proceed as follows:
i. Pump system down to 28 in. of mercury and allow pump to
continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open
until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr. During
this time, &y nitrogen will be able to difli_se throughout the
system, absorbing moisture.