33
Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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MAX
MULTI
F
MULTI
F
Flare nut
Piping
1. 3/8 in. to 3/8 in. Connection
2. 3/8 in. to 1/2 in.
Connection
Flare side to
branch distribution unit or ODU
Flare side to indoor unit
Ø3/8 in.
Flare side to indoor unit or
pipe to indoor unit
Ø1/2 in.
Connection socket
Flare nut
Piping
Ø3/8 in.
Ø3/8 in.
Spanner
Field Piping
Flare nut
Torque
wrench
3. 1/2 in. to 5/8 in.
Connection
Ø5/8 in.
Connection socket
Flare nut
Piping
Ø1/2 in.
4. 1/4 in. to 3/8
Connection
Flare side to indoor unit
Ø3/8 in.
Connection socket
Flare nut
Piping
Ø1/4 in.
Flare
side to
branch distribution unit or ODU
Flare side to indoor unit
Flare
side pipe
from branch distribution unit or ODU
Flare
side to
branch distribution unit or ODU
Multi F System Piping Connections
Figure 39: Possible Outdoor Unit or Branch Distribution Unit to Indoor Unit Connections.
1. When connecting the flare nuts, coat the flare (inside and outside) with polyvinyl ether (PVE)
refrigeration oil only.
2. Align the center of the piping sections and tighten the flare nut by hand.
3. Tighten the flare nut with a torque wrench and a backup wrench until a click is heard.
4. Wrap insulation around the connection.
5. If it is necessary to loosen the flare nuts, always use two wrenches to do so.
PIPING CONNECTIONS
IDU to ODU
Union
Figure 40: Tightening the Flare Nuts.
Pipe size (Inches O.D.)
Tightening torque (ft-lbs)
Width of the flare (A [inches])
1/4Ø
13.9 - 18
1/8
3/8Ø
24.5 - 30.3
1/8
1/2Ø
39.7 - 47.7
1/8
5/8Ø
45.5 - 59.2
1/16
Table 24: Tightening Torque for Flare Nuts.
Note:
Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with PVE oil used in this
system and create oil sludge leading to equipment damage and system malfunction.
