Lennox MMA018SM4

65
14. Installation Requirements
14.1. Torque Requirements
CAUTION
Refrigerant pipe diameter is di󰀨erent according to indoor unit to be connected. When using the extension pipe, refer to
the tables below.
When refrigerant pipe diameter is di󰀨erent from that of the outdoor unit connector (18K indoor unit) an additional adapter
is required.
Table 6. Torque
Outside Diameter Torque Additional Tightening
MM Inches v.cm N.cm
Ф6.35 1/4 1500 (153kgf.cm) 1600 (163kgf.cm)
Ф9.52 3/8 2500 (255kgf.cm 2600 (265kgf.cm)
Ф12.7 1/2 3500 (357kgf.cm) 3600 (367kgf.cm)
14.2. Pipe Length and Elevation
Maximum piping length and height di󰀨erence.
Table 7. Pipe Diameter - MM (Inches)
Indoor Unit
Extension Pipe Diameter (mm/inches)
Model Pipe Diameter (mm/inches)
18K
Liquid 6.35 (1/4) Liquid 6.35 (1/4)
Gas 12.7 (1/2) Gas 12.7 (1/2)
24K
Liquid 9.52 (3/8) Liquid 9.52 (3/8)
Gas 15.9 (5/8) Gas 15.9 (5/8)
24K 1 drive 2
Liquid 6.35 (1/4) *2
Gas 9.52 (3/8) *2
30K 1 drive 3
Liquid 6.35 (1/4) *3
Gas 9.52 (3/8) *3
36K 1 drive 4
Liquid 6.35 (1/4) *4
Gas
9.52 (3/8) *3
12.7 (1/2) *1
48K 1 drive 5
Liquid 6.35 (1/4) *5
Gas
9.52 (3/8) *3
12.7 (1/2) *2
Table 8. Line Set Length - Meters (Feet)
Length 1 Drive 2 1 Drive 3 1 Drive 4 1 Drive 5
Max. length for all rooms (m) 40 (131) 60 (197) 80 (262) 80 (262)
Max. length for one IU (m) 25 (82) 30 (98) 35 (115) 35 (115)
Max. height di󰀨erence between IU and
OU (m)
15 (49.2) 15 (49.2) 15 (49.2) 15 (49.2)
Max. height di󰀨erence between IUs (m) 10 (33) 10 (33) 10 (33) 10 (33)