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Electrical wiring
10.4.1 Connection of indoor units
Connect each outdoor unit to a power supply line. Install an earth
leakage breaker, fuse and circuit breaker for each outdoor unit
power line.
Connect each group of indoor units corresponding to an outdoor
unit to a voltage supply line (maximum capacity for each group of
indoor units: 26 HP). Install an earth leakage breaker, fuse and
circuit breaker for each group of indoor units.
Connect the communication cable between the indoor units, the
CH units and the outdoor units.
Connect the communication cable on the corresponding units to
the same refrigerant cycle. (Where the refrigerant pipe of the in-
door unit is connected to the outdoor unit, connect the communi-
cation cable to the same indoor unit).
N O T E
Connecting the refrigerant pipe and the communication cable to
units in different refrigeration cycles may lead to operating prob-
lems.
Use shielded twisted pair cable or shielded pair cable. Do not use
cable with three or more conductors.
Use the same type of cables for the H-LINK system of units in
each refrigerant cycle.
Ensure a minimum distance of 50 mm between the power cables
and the communication cables and 1500 mm between these and
the power cables of other electrical devices. Where this is not
possible, install power cables in a metal duct separate from the
others.
Connection diagram: heat recovery system
ELB
63
PMML0294A_rev.2_02-2014.indb 63
A1
CB
F
CB
K
B
F
ELB
C
D
CB
F
ELB
E
G
PMML0294A rev.2 - 07/2014
Connect the communication cables to TB2 terminals 1 and 2 on
outdoor unit A (main unit):
•
Between the outdoor unit and the indoor unit.
•
Between the outdoor unit and the CH unit.
•
Between the outdoor unit and the indoor unit on other refrig-
eration cycles.
C A U T I O N
Do not connect power cables to communication terminals (TB2).
This could damage the circuit board.
In heat recovery systems, connect the indoor unit communication
cable (used exclusively for refrigeration) to TB2 terminals 1 and
2 on the CH unit.
Connect the earthing cable for the outdoor units, the indoor units
and the CH units. Earthing connections below a resistance of
100 Ω (max.) must be made by skilled personnel.
N O T E
•
Set the DSW switches on the main and secondary units for
the combination of (14-36) HP outdoor units.
•
An alarm is triggered if the communication cables between
the outdoor units are connected to terminals 1 and 2 for H-
LINK II.
•
Where an alarm is indicated on the display of the main out-
door unit, follow the instructions given to make the necessary
checks.
•
Make the function settings from the main outdoor unit.
•
Maximum number of refrigeration groups with one remote
control: 64. Maximum number of indoor units connected: 160.
K
K
J
C
C
D
D
E
E
E
G
G
H
C
C
D
D
E
G
G
I
14/07/2014 12:28:36
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