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Piping Connection and Compressor
Installation
Brazing
•It is important to fl ow nitrogen through the system
while brazing all joints during the system assembly
process. Nitrogen displaces the air and prevents the
formation of copper oxides in the system.
•Recommended brazing materials: any material is
recommended, preferably with a minimum of 45%
silver.
•Be sure valves I.D. and connecting tube O.D. are
clean prior to assembly. If oil fi lm is present, wipe with
denatured alcohol, Dichlorotrifl uoroethane or other
suitable solvent.
•Using a double-tipped torch apply heat in Area 1. As
tube approaches brazing temperature, move torch
fl ame to Area 2.
•Heat Area 2 until braze temperature is attained,
moving torch up and down and rotating around tube
as necessary to heat tube evenly. Add braze material to
the joint while moving torch around joint to fl ow braze
material around circumference.
Dimensional Drawings
Figure 6. Compressor connection and ports. For identifi cation refer to the Table on the next page.
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•After brazing material fl ows around joint, move torch to
heat Area 3.
•This will draw the braze material down into the joint.
The time spent heating Area 3 should be minimal.
•As with any brazed joint, overheating may be
detrimental to the fi nal results.
•When welding the discharge line connection pipe to the
discharge service valve, the O-ring must be replaced
with a new one. Replacement O-ring can be found on
the accessory bag.
•If the suction and discharge shut-off valve bolts or
rotary valve joint are released while brazing the shut-off
valves, replace the shut-off valve spacer or O-ring. The
non-metal valve spacer and O-ring must be oiled prior
to assembly.
Area
Area
Area
3
2
1
Compressor
Valve
Connecting
Tube
Figure 5. Brazing
All dimensions are in mm
No.
Connection/Port
Size
1
DPS (differential pressure switch)
3/4"-16UNF
3
Bolt-mounting
M10
5
Nut-oil out fi tting
M16
7
Connector EXV/oil temperature sensor
9
Connector optional
11
Liquid out
3/4"
13
DLT sensor
15
Nut- EVI fi tting
M20
17
Vapor in temperature sensor
19
Built-in oil screen
M20
21
Crankcase heater
23
Suction valve
28.7 ID
25
Discharge valve
25.7 ID
Notes: SL: Suction Line
DL: Discharge Line
To disconnect:
•
Reclaim refrigerant from both the high and low side of the system. Cut tubing near compressor.
To reconnect:
•
Recommended brazing material is one with minimum 45% silver or silver braze material with fl ux. Insert tubing
stubs into fi tting and connect to the system with tubing connectors. Follow instructions on Brazing.
Piping Connections
Copeland Scroll™ Fusion has very low vibration
characteristics, so discharge and suction vibration
eliminators should not be necessary in the majority of
installations. The suction, discharge and liquid pipes
should all have sections running close to the compressor
body in parallel with the shaft to absorb any startup or
shutdown torsion. Vibration is much lower than those
found in equivalent piston compressors, and discharge
pulsations are negligible due to the muffl ing effect of the
discharge cover.
Figure 7. Piping guideline
No.
Connection/Port
Size
2
Plug low-pressure connection
1/4"-18NPTF
4
Plug oil drain
1/4"-18NPTF
6
Connector DLT/VIT/VOT/optical OLS/DPS
8
Screw grounding
M5
10
Nut- oil in fi tting
M16
12
Liquid in
3/4"
14
Vapor out temperature sensor
16
EXV Coil
18
Optical oil level sensor
7/8"-14UNF
20
Oil level sight glass
22
Low pressure port
24
Plug high-pressure connection
1/4"-18NPTF
26
High pressure port
Recommended minimum straight length from discharge
valve to fi rst bending point is 200 mm, minimum bending
radius is 60 mm.
For ease of service, a minimum space of 500 mm between
top cap surface to casing wall is recommended. Refer to
Figure 7.
Vapor Injection and Liquid Line
Temperatures
Copeland Scroll Fusion compressor package applies
vapor injection technology to improve LT operational
effi ciency and provides a reliable LT envelope. Vapor
injection subcools the main liquid line and compressor oil
using the integrated plate heat exchanger economizer. The
subcooling of liquid line calls for these recommendations:
1. Liquid line pipe connecting the economizer to the
evaporator expansion valve has to be well insulated
separately. See Liquid Line Insulation for insulation
thickness.
2. The lower liquid line temperature can increase the
evaporator expansion valve capacities. Please follow
valve manufacturers recommended liquid temperature
correction factors for proper selection of evaporator
expansion valve. Refer to catalogue or contact your
local Emerson sales offi ce for liquid line temperatures.
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