Lennox V8MSBB01, Руководство по установке, Страница: 8 / 22

8
All lines must be individually insulated.
1. The seal on the mode selection box refrigerant piping
connections should remain in place until the last
possible moment. This will prevent dust or water from
getting into the refrigerant piping before it is connected.
2. Remove the black plastic caps from the mode selection
box connections and discard.
3. Slide the fl are nuts onto the ends of the fi eld-provided
refrigerant piping
before
using a suitable fl aring tool to
fl are the end of the copper pipe.
4. Apply recommended R-410A refrigerant lubricant to the
outside of the fl ared refrigerant lines (Figure 5-A).
5. Align the threaded connections with the fl ared refrigerant
lines. Tighten the fl are nuts lightly at fi rst to obtain a
smooth match (Figure 5-B).
Size
(Btuh)
Liquid Line
in.
Vapor Line
in.
7000
12000
15000 1/4 1/2
18000
24000
30000
36000
48000
3/8 5/8
Table 2. Refrigerant Piping Connections
(Up to a maximum of 32 ft. only)
6. Then, use two wrenches to continue to tighten the nuts
without twisting the pipes. Once snug, continue another
half-turn on each nut which should create a leak-free
joint. A torque wrench may be used to tighten
fl are
nuts using table 3 recommendations. See Figure 6.
Do
not over-tighten a fl ared joint. Flared connections
should always be accessible and must be insulated
to prevent condensation.
7. After refrigerant piping has been installed and checked
for leaks, apply insulation over the piping and all fl are
connections.
A
B
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
Figure 5. Making Connections
(Male to Female Connection)
Figure 6. Tighten Flare Nut
To
Mode
Selection
Box
To Indoor Unit
Backup
Wrench
Torque
Wrench Always refer to the provided piping diagram for correct pip-
ing sizes. Contact Lennox VRF Application support for as-
sistance with piping sizing or an updated piping diagram.
NOTE - 5/8” and 3/8” fl are nuts are part of the reducing
adapters. Cut the reducing adapters to release the 5/8”
and 3/8” fl are nuts.
IMPORTANT
Always use two wrenches when tightening fl are nuts to
avoid twisting refrigerant piping. DO NOT over-tighten
fl are nuts.