Multi F Outdoor Unit Engineering Manual

Table 178: Outdoor Unit Piping Connections.
Figure 72: Multi F Refrigerant Pipe Connections
(LMU369HV shown as example).
Avoid Pipe Damage
• When routing field-provided piping, avoid damaging the outdoor unit from excessive vibration.
• Correctly route the piping so it does not make contact with mounting bolts. Allow room for field installation.
• Properly insulate the liquid and gas lines separately up to the point of connection at the unit frame.
• See Table 179 for Multi F outdoor unit connection types.
Main gas
valve
Main liquid
valve
Gas Piping Connections
Liquid
Piping
Connections
A-UNIT
B-UNIT
C-UNIT
D-UNIT
Connection sockets (included as a factory-supplied accessory with the indoor units) may need to be used when piping the indoor units to the
outdoor unit.
Indoor Unit Capacity
Vapor (in., OD) Liquid (in., OD)
A B A B
18,000 Btu/h
Ø3/8→Ø1/2 N/A
24,000 Btu/h
A
B
Flare
to
Indoor
Unit
Flare
to
Outdoor
Unit
Indoor Unit Capacity Vapor Line Connection (in., OD) Liquid Line Connection (in., OD)
9,000 Btu/h
Ø3/8
Ø1/4
12,000 Btu/h
18,000 Btu/h
Ø1/2
24,000 Btu/h
1. Align the center of the piping sections and tighten the flare nut by
hand.
2. Tighten the flare nut with a torque wrench, using the arrows on
the wrench as a guide, until a click is heard.
INSTALLATION & LAYOUT BEST PRACTICES
Refrigerant Piping System Layout
Multi F Outdoor Unit to Indoor Unit Piping Connections
Outdoor Unit Piping Connections LMU187HV LMU247HV LMU369HV
Liquid Line Connection (in., OD) x Qty. 1/4 x 2 1/4 x 3 1/4 x 4
Vapor Line Connection (in., OD) x Qty. 3/8 x 2 3/8 x 3 3/8 x 4
Table 179: Indoor Unit Piping Connections.
Table 180: Connection Socket Dimensions.
Figure 73: Connection Socket Diagram.
Using the Connection Socket
Connection Socket
(Factory-supplied with
the indoor unit)
Figure 74: Performing Connections.
Due to our policy of continuous product innovation, some specications may change without notication.
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210 | DESIGN & PRACTICES
Multi F and Multi F MAX Heat Pump System Engineering Manual
MULTI
F
MAX
MULTI
F