Table of Contents
Advertisement
Outdoor unit
(main unit)
(PQ)
P Q
Install a terminating resistor (Ω120) at the last indoor unit terminals P and Q of the daisy chain.
All shields of shielded cable connect to
18 GA., stranded, 2-conductor, shielded control wire (polarity sensitive).
Typical Wiring Diagram, NEC/CEC and Local Codes apply.
Figure 17. Typical Communication Wiring Diagram (VRF Heat Pump System)
Tightening torque for the terminal screws
•
Use the correct screwdriver for tightening the terminal
screws.
•
If the terminal screws are over tightened, screws
might be damaged.
•
Refer to Table 5 for the tightening torque of the
terminal screws.
IMPORTANT
DO NOT adjust DIP switch settings. Settings may only
be adjusted by a trained technician as part of the com-
missioning procedures.
Outdoor unit
(sub1 unit)
(H1 H2
)
(H1 H2
)
K1
(PQ)
chassis GROUND terminal at Indoor Units.
Outdoor unit
(sub2 unit)
(H1 H2
)
K2
O
A
Outdoor Unit Communication Terminal Block
Table 5. Terminal Screw Tightening Torque
Terminal base of
remote controller/Signal
transmission wire (X2M)
Terminal base of power
supply (X1M)
Grounding terminal (M4)
•
After wiring, confirm all connections are correct; Then
turn on power supply to the unit.
16
X
Y
P
Q
HA HB 12V COM P
Indoor Unit Communication Terminal Block
Ground cable shield
to Indoor Unit chassis
Tightening torque (lb-ft)
0.58-0.72
0.87-1.06
1.06-1.43
H1 H2
Q
Advertisement
Table of Contents
