Refrigerant Piping Connections; Typical Refrigerant Piping Diagram - Lennox VPB036H4M Installation Instructions Manual

Refrigerant Piping Connections

Refer to the Calculation and Selection report for all pipe
sizes and lengths.
Refer to the outdoor unit manual for outdoor unit piping
connections.
The vapor line is run directly from the outdoor unit to the
indoor unit coil.
Designs with these kits require approval by the Lennox VRF Applications Team prior to installation.
NOTE - See Refrigerant Pipe Selection Table to size Pipes
D e s c i r t p o i n
Liquid Pipe
Vapor Pipe
Outdoor Unit
or
MS Box
Piping Length
Maximum piping length
Maximum level difference
Liquid Pipe
Vapor Pipe
Permitted value
AHU Control Kit to
16 ft. (5 m)
indoor unit coil
AHU Control Kit to
+/- 16 ft. (5 m)
indoor unit coil
Figure 9. Typical Refrigerant Piping Diagram
The liquid line is run from the outdoor unit to the AHU
Control Box (or EXV if removed from the box) and then
from the AHU Control Box (or EXV if removed from the
box) to the indoor unit coil.
Piping limitations shall be followed in all applications.
Contact VRF Technical Support, 1-844-438-8731, with
any questions.
D e s g i n t a o i n
L2
L3
AHU Kit with EXV or EXV
L2
Piping
L2
H2
14
Air Handler Unit
H2