898150-UIM-B-0113
Johnson Controls Unitary Products
17
REFRIGERANT PIPING CONNECTIONS
A Service port cap protects the service port core from contamination
and serves as the primary leak seal. To access service port:.
1. Remove service port cap with an appropriate sized wrench.
2. Connect gauge set to service port.
3. When testing is complete, replace service port cap and tighten as
follows:
a. With torque wrench - Finger tighten then torque cap per Table 11
requirements.
b. Without torque wrench - Finger tighten then use appropriate
sized wrench to turn an additional 1/6 turn clockwise.
Stem cap protects the valve stem from damage and serves as the pri-
mary seal. Replace the stem cap and tighten as follow:
1. With torque wrench - Finger tighten and use torque cap per Table
11.
2. Without torque wrench - Finger tighten then use an appropriate
sized wrench to turn an additional 1/12 turn clockwise.
INDOOR UNIT CONNECTION
• Connect both liquid and gas pipes to indoor unit.
• Apply a sealing cap or water-proof tape to prevent dust or water
from getting into the refrigerant piping before it is connected.
• Apply a thin coat of refrigerant oil on the seal surface of the pipe.
• For connection, first align the union tube and flared refrigerant
line with each other then tighten the flare nuts lightly at first to
obtain a smooth match.
FIGURE 34:
42K Outdoor Unit Terminal
To unit B
To unit A
To unit C
To unit D
L1
L1
L2
L2
N(1)
C
B
A
D
42 KBTU OUTDOOR UNIT (FIVE ZONE MAXIMUM)
MAIN
POWER
TO INDOOR
UNIT
TO INDOOR
UNIT
TO INDOOR
UNIT
TO INDOOR
UNIT
MAIN
POWER
OUTDOOR
UNIT
OUTDOOR
UNIT
OUTDOOR
UNIT
OUTDOOR
UNIT
INDOOR UNIT
INDOOR UNIT
INDOOR UNIT
INDOOR UNIT
A
B
C
D
INDOOR /
OUTDOOR
CABLE ENTRY
INDOOR /
OUTDOOR
CABLE ENTRY
INDOOR / OUTDOOR
CABLE ENTRY
INDOOR / OUTDOOR
CABLE ENTRY
MAIN POWER FROM OUTDOOR UNIT DISCONNECT
A
B
C
D
A
B
C
D
L1
L2
L1
L2
IMPORTANT
Check indoor to outdoor field wiring to confirm (N)1 from indoor
goes to (N)1 outdoor, terminal 2 from indoor goes to terminal 2
outdoors and terminal 3 indoors goes to terminal 3 in outdoor.
LEGEND
N(1) = L1
2 = Data line
3 = L2
= Ground
cable
connection
connection
cable
To unit C
connection
cable
N(1) 2 3
N(1) 2 3
N(1) 2 3
To unit C
connection
cable
N(1) 2 3
power
cable
L1 L2
N(1)
2
3
N(1)
2
3
N(1)
2
3
N(1)
2
3
N(1)
2
3
N(1)
2
3
N(1)
2
3
N(1)
2
3
To unit D
To unit C
connection
cable
N(1) 2 3
N(1)
2
3
N(1)
2
3
INDOOR UNIT
E
TO INDOOR
UNIT
• Fasten flare nut with a torque wrench as specified in Table 9.
• When fastened too tight, flare nut may break after a long period
and cause refrigerant to leak.
NOTICE
