7
Low-pressure gas pipe (1-1/8” O.D.)
High-pressure gas pipe (7/8” O.D.)
Liquid pipe (5/8” O.D.)
V8MSBB03
V8MSBB04
Low-pressure gas pipe (1-1/8” O.D.)
High-pressure gas pipe (7/8” O.D.)
Liquid pipe (5/8” O.D.)
1
3/8 x 1/4 in. adaptor furnished for liquid pipe connection to indoor unit (if required).
2
5/8 x 1/2 in. adaptor furnished for gas pipe connection to indoor unit (if required).
3
1 inch x 3/4 in. condensate drain adaptor furnished for
fi
eld installation (if required).
Gas pipe O.D. (5/8” O.D.
1
)
Liquid pipe O.D. (3/8” O.D.
2
)
Drain connection (1” O.D.
3
)
Gas pipe O.D. (5/8” O.D.
1
)
Liquid pipe O.D. (3/8” O.D.
2
)
Drain connection (1” O.D.
3
)
Low-pressure gas pipe (7/8” O.D.)
High-pressure gas pipe (3/4” O.D.)
Liquid pipe O.D. (1/2” O.D.)
V8MSBB01*
V8MSBB02
Gas pipe O.D. (5/8” O.D.
1
)
Liquid pipe O.D. (3/8” O.D.
2
)
Drain connection (1” O.D.
3
)
Figure 4. Mode Selection Box Piping Connection Details
* Use with VHIA072 and 096 only. Connective branch pipe kit included with indoor unit.
•
Refrigerant piping connections from outdoor unit(s)
are made with
fi
eld-brazed connections. Field piping
connections for the outdoor unit gas pipes and liquid
pipe are provided on the right side of the mode
selection box.
•
The four available mode selection boxes can
accommodate varying numbers of indoor units. See
Table 1 and Figure 4.
Outgoing gas and liquid connections for the indoor
units are on the front of the box. Connections to the
indoor units are made using the provided brass
fl
are
nuts. Adaptors are provided with the mode selection
box to accommodate the use of different pipe sizes.
Refer to the LVSS (Lennox VRF Selection Software)
piping report for pipe sizes.
•
Refer to the VRA heat recovery unit installation
instructions and product speci
fi
cations (EHB) bulletin
for more detailed information on refrigerant piping
connections.
•
Field refrigerant piping for the VRA heat recovery units
includes a variety of branch pipe kits, mode selection
boxes and
fi
eld-provided piping.
Outdoor unit branch pipe kits are used to join multiple
outdoor units to reach the required system capacity.
Mode selection box branch pipe kits are available
to evenly split system capacity among the varying
numbers of mode selection boxes.
Indoor unit branch pipe kits split the system capacity
among up to four indoor units per connection from
each mode selection box. See mode selection box
branch pipe kits in Figure 8 and a typical VRA system
piping schematic in Figure 9.
•
Allow a minimum of 3 feet between the mode selection
box and the
fi
rst elbow or branch pipe in refrigerant
piping. See Figure 3.
•
After refrigerant piping has been installed and checked
for leaks, apply the provided insulation sleeves over all
connections.