Table2--AccessoryUsage
REQUIRED FOR LOW-AMBIENT
APPLICATIONS
(BELOW SS°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
Hard Shutoff TXV Yest Yest
See Long-Line
Liquid-Line Solenoid Valve for Heating No Application Guideline
* For tubing line sets between 50 and 175 ft, or when vertical difference is greater than 20 ft, refer to Application Guideline and Service Manual -- Residential Split-System
Air Conditioners and Heat Pumps Using Puron®
1 Required for all applications.
wrench an additional 112 turn (15 fl-lb). DO NOT OVER-
TIGHTEN.
REFRIGERANT TUBING AND FILTER DRIER
g.,l[_
Installation of filter drier in liquid line is required to avoid
performance loss due to plugged circuits or plugged expan-
sion devices, and to avoid compressor failure.
Connect vapor tubing to fittings on outdoor unit vapor service
valves. Connect liquid tube to filter drier. (See Table 1 and Fig. 8.)
Use refi'igerant grade tubing. Connect other end of filter &ier to
adapter tube on liquid service valve.
SWEAT CONNECTION
To avoid valve damage while brazing, service valves must be
wrapped in a heat-sink 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-
lilellts.
LEAK CHECKING
Leak test all joints in indoor, outdoor, and refrigerant tubing.
r
EVACUATE REFRIGERANT TUBING AND INDOOR (?OIL
To avoid compressor damage never use the system compres-
sor as a vacuum pump.
Refrigerant tubes and indoor coil should 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 free of air
and liquid water. (See Fig. 9.)
50OO
4500
4000
3500
3000
_2500
2000
1500
1000
500
LEAKIN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0 1 2 3 4 5 6 7
MINUTES
A95424
Fig. 9--Deep Vacuum Graph
IEVACUATE ]
IBREAK VACUUM WITH DRY NITROGENI
IEVACUATEI
IBREAKVACUUMWITHDRYN TROGENI
IEVACUATEI
(IF IT HOLDS DEEP VACUUM)
ICHARGESYSTEMI
A95425
Fig. 10--Triple Evacuation Method
To Next Page
Loading...