International comfort products CAC075 Installation Instructions Manual page 6

Installation Instructions
3. Insert tubing into swage fitting connection.
4. Apply heat absorbing paste or heat sink product to pre-
vent damage to the service valve.
CAUTION
Do not heat valve body above 250 degrees F.
5. Braze joint.
6. Quench the joint and tubing with water using a wet rag.
Leave rag on fitting body and re--wet with water to help cool
area.
Evacuating, And Charging Instructions
Intentional release of CFC or HCFC Refrigerant to the
Atmosphere violates Federal Law. It may also violate
State and Local Codes. Check all Federal, State and
Local Codes before proceeding.
These instructions are intended for use with condensing
units that are precharged at the factory with a 10 oz. hold-
ing charge only.
The liquid line and suction line service valves have been
closed after final testing at the factory. Do not disturb
these valves until the lines have been leak checked
and evacuated or the holding charge and vacuum in
the unit may be lost.
Recommended Method Of Evacuating A
System
1. Connect the vacuum pump to the suction and liquid line
gauge ports.
2. If the evacuation is being performed on a new system
installation, the valves should be kept in the closed posi-
tion. This will allow the mechanic to evacuate the refrigera-
tion lines and the indoor coil, without disturbing the holding
charge and vacuum in the outdoor unit.
3. Follow the vacuum pump manufacturer's instructions.
Allow the pump to operate until the system has been eva-
cuated down to 300 microns. Allow the pump to continue
running for an additional 15 minutes. Turn off the pump and
leave the connections secured to the two service valves.
After 5 minutes, if the system fails to hold 500 microns or
less, check all connections for tight fit and repeat the evac-
uation procedure.
4. Isolate the vacuum pump from the system by closing the
shutoff valves on the gauge bar. Disconnect the vacuum
pump.
Valve Actuation: Service Valves
Remove the service valve cap, if there is a male valve stem
see instructions for Ball Valves. For the standard service
valve there are two variations, but both have internal
stems. The first style uses an internal snap ring to retain the
valve stem and the second has a rolled top and also has
finer threads on the valve cap. NOTE: You may encounter
more than one type of valve on a unit.
6
NOTE
For service valves fully insert a hex wrench into the stem. A
back--up wrench is required on the valve body to open the
valve stem. Backout counterclockwise until the valve stem
stops or just touches the retaining ring. NOTE: THIS IS
NOT A BACKSEATING VALVE. For valves with retainer
rings care must be taken to prevent dislodging them when
opening valve.
The service valve cap is a primary seal for the valve and
must be properly tightened to prevent leaks. Make sure cap
is clean and apply refrigerant oil to threads and sealing sur-
face of cap.
For valves with retaining rings: Replace service valve
cap and torque to; 8--11 ft. lbs. on 1/4" and 3/8" valves,
12--16 ft. lbs. on 5/8" and 3/4", 15--21 ft. lbs on 7/8" valves. If
torque wrench is not available, tighten cap finger tight and
then tighten one (1) additional wrench flat or 1/6 of a turn.
For valves with rolled tops: Replace service valve cap
tighten cap finger tight and then tighten one (1) additional
wrench flat or 1/6 of a turn to properly seat the sealing sur-
faces. Subsequent installations will seat with 1/2 to 1
wrench flat of turning.
Gauge Ports: All Valves
Check for leaks at the schrader port and tighten valve core
if necessary. Install plastic caps finger tight.
Ball Valves
On models with ball type valves use a 6" crescent wrench
to rotate the valve stem 90° counter clockwise. Retighten
valve cap to 6--8 ft. lbs. If torque wrench is not available,
tighten cap finger tight and then tighten one (1/2) additional
wrench flat.
REFRIGERATION PIPING & CHARGING
Total length of refrigerant lines must not exceed 100
feet with a maximum vertical seperation of 50 feet un-
less precautions are taken to protect the compressor
from refrigerant migration during the off cycle.
The recommended method of checking charge is by sub--
cooling on systems using a thermal expansion valve.
Measure at liquid line service valve on the outdoor unit. The
oil charge is sufficient for 50 feet.
For oil requirements greater than 50 feet refer to Figure 4.
Figure 4 - - Addition of Refrigeration Oil
Distance Suction Line Size
(Feet)
0--49
50--59
60--69
70--79
80--89
90--99
Figure 6 - - Addition of Refrigeration Charge
Liquid Line Diameter
1/2
5/8
See next page for Charging Chart.
Split System Condensers
1--1/8
--
2 oz.
4 oz.
6 oz.
8 oz.
10 oz.
oz. Per Linear Ft.
1.20
1.80
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