27
Refrigerant Piping Connections
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Model
Liquid Conn. (inches)
Vapor Conn. (inches)
ARUN053FG2
3/8
3/4
Figure 27: Space II Refrigerant Piping (and
Wiring) Direction.
Refrigerant piping can be connected through the access holes on the front panel of the Multi V
Space II frame.
•
Use nitrogen at 3 psi flow during welding.
•
If nitrogen was not used during welding, oxidized contaminants may build inside the piping
and effect valve and condenser operation.
Table 14: Space II Unit Refrigerant Pipe Connections (All Brazed Type).
Front Panel
DIRECTION OF PIPING/WIRING
avoid Pipe Damage
•
When routing field-provided piping inside the Space II unit frame, avoid causing vibration
that will damage the components.
•
Correctly route the piping so it does not make contact with the compressor casing, terminal
cover, or mounting bolts. Allow room for field installation.
•
Properly insulate all refrigerant pipes separately up to the service valve body inside the
confines of the unit frame.
1. Remove the leak-prevention cap.
2. Check if the liquid and vapor pipes
are fully locked.
3. Vacuum out any remaining refriger-
ant or air through the service port.
space II unit Pipe routing
Figure 28: Space II Unit Pipe Connections.
Service Ports
Vapor Pipe
Liquid Pipe
The leak prevention cap attached to the
outdoor unit must be removed before piping
installation.
Device connection limitations
•
The minimum number of connected and operating indoor units to Multi V Space II
systems is one (1), taking into consideration the minimum combination ratio.
•
The maximum number of indoor units on a Multi V Space II unit is nine (9).
Table 15: Multi V Space II Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent Length
of pipe in Feet)
Longest total equivalent piping length
≤ 476 feet
Longest distance from outdoor unit (ODU) to indoor unit (IDU)
230 feet (Actual) 296 feet (Equivalent)
Distance between fittings and indoor units
≥ 20 inches
Minimum distance between Indoor unit to any Y-branch
≤ 131 feet
Minimum distance from indoor unit to Y-branch
3 feet
Maximum distance between first Y-branch to farthest indoor unit
131 feet
Elevation
(All Elevation Limitations
are Measured in Actual
Feet)
If outdoor unit is above indoor unit
98.4 feet
If outdoor unit is below indoor unit
98.4 feet
Between any two indoor units
49 feet
One of the most critical elements of a Multi V Space II system is the refrigerant piping. The table below lists pipe length limits that must be
followed in the design of a Multi V Space II refrigerant pipe system:
Table 16: Equivalent Piping Length for Y-branches, Headers, and Other Piping Components.
Component
Size (Inches)
1/4
3/8
1/2
5/8
3/4
7/8
1
1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2-1/8
Elbow (ft.)
0.5
0.6
0.7
0.8
1.2
1.3
1.5
1.6
1.8
2.0
2.1
2.3
2.5
2.8
Y-branch (ft.)
1
1.6
Header (ft.)
3.3
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
refrIGerant PIPInG connectIons
Summary of Contents for Multi V ARUN053GF2
Page 1: ...Installation Manual Variable Refrigerant Flow Outdoor Unit 4 4 Tons ...
Page 73: ......
Page 74: ......
