9
A
B
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
Figure 16. Making Connections
(Male to Female Connection)
IMPORTANT
Always use two wrenches when tightening flare nuts to
avoid twisting refrigerant piping. DO NOT over-tighten
flare nuts.
TORQUE WRENCH
TO INDOOR
UNIT
TO OUTDOOR UNIT
BACKUP
WRENCH
Figure 17. Tighten Flare Nut
Table 3. Flare Nut Torque Recommendations
Outside
Diameter
Recommended
Torque
No torque wrench available
Finger tighten and use an
appropriately sized wrench to
turn an additional:
Inches
1/4
15 ft.-lb. (20 N)
1/4 turn
3/8
26 ft.-lb. (35 N)
1/2 turn
1/2
41 ft.-lb. (56 N)
7/8 turn
5/8
48 ft.-lb. (65 N)
1 full turn
Indoor Unit Installation
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Please refer to the installation instruction included with the
indoor unit for setup.
IMPORTANT
Pipe and wire to each zone separately.
Test each indoor unit separately to ensure proper
operation.
Connecting Multiple Capacity Indoor Units
• The largest cpacity indoor unit must be connected to
the lowest refirigerant connection ports on the outdoor
unit.
•
The 24,000 Btu indoor unit is only allowed to be
connected to MPA048S4M, MPB048S4M and
MLA036S4M outdoor units.
NOTE:
Each indoor unit must be piped AND wired to
the correct zone piping connections and wiring
terminals. Make sure that indoor unit A is wired
to the zone A terminal block and connected to the
appropriate refrigerant pipe connections.
A B C D
Unit D
Unit D
Unit C
Unit B
Unit A
Unit C
Unit B
Unit A
wire
pipe
outdoor
indoor
L4(ft)
L3(ft)
L2(ft)
L1(ft)
Figure 18. Pipe and Wire Each Zone Separately
A(1/2in)
A(1/4in)
B(3/8in)
B(1/4in)
C(3/8in)
C(1/4in)
Figure 19. Connecting Multiple Capacity Indoor
Units
