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I Split System Condensers R410-A Installation Instructions I
Triple Evacuation Method
The triple evacuation method should only 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. 8 and proceed is as follows:
1. Pump system down to 28 in. of mercury and allow
pump to continue operating for an additional 15 min-
utes.
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, dry nitrogen will be able to diffuse
throughout the system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 6. System
will then be free of any contaminants and water va-
por.
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. Ibs. on 1/4" and 3/8" valves,
12-16 ft. Ibs. on 5/8" and 3/4", 15-21 ft. Ibs 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 fiat or 1/6 of aturn 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.
gure 6[
Fi Triple Evacuation Chart
IEVACUATEI
IBREAK VACUUM WITH DRY NITROGEN
IEVACUATE I
IBREAK VACUUM WITH DRY NITROGEN
IEVACUATE I
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
I CHARGE SYSTEM J
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.
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.
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. Ibs. If torque wrench is not available,
tighten cap finger tight and then tighten one (1/2) additional
wrench fiat.
REFRIGERATION PIPING & CHARGING
The recommended method of addition or removal of refrig-
erant is by weight.
Some matching coils may need more refrigerant than the
factory charge. If you can't determine charge by weight,
then check charge by superheat method and performance
curves. The oil charge is sufficient for 50 feet.
For oil requirements refer to Figure 7. For piping lengths
up to 75 feet refer to Figure 8 for pipe size, and Figure 9 for
refrigerant adjustment.
On applications where liquid fioodback to the compressor
is likely to occur, use of a crankcase heater is recom-
mended.
Figure 7 - Addition of Refrigeration Oil
Distance
(Feet)
0-50
51
6O
75
Suction Line Size
5/8, 3/4, 7/8 1- 1/8
1 oz. 2 oz.
2 oz. 4 oz.
3 oz. 6 oz.
Figure 8 - LINE SIZING
Model Series
All Series
All Series
Size-ton Liquid Suction
1 1/2 to 3 3/8" 3/4"
3 1/2 to 5 3/8" 7/8"
Figure 9 Addition of Refrigeration Charge
Liquid Line Diameter oz. Per Linear Ft. *
3/8 .60
1/2 1.20
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