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outdoor unit
P
Q
L1
Main MDC unit
To outdoor
To Sub MDC
L2
To outdoor
Maximum wiring length
Fig. 30 —Typical Heat Recovery System Communication Wiring
L5
X
Y
To No.1
indoor
To No.2
indoor
To No.3
indoor
To No.4
indoor
L3
To No.1
MDC unit
indoor
To No.2
indoor
Centralized controller
X Y
P Q
L3
P Q
L3
Indoor unit 2#
L3
P Q
Indoor unit 3#
P Q
Indoor unit 4#
L4
P Q
Indoor unit 5#
L4
P Q
19
wired controller
NOTE: 24 v. DC Power
(Field Supplied)
Indoor unit 1#
wired controller
NOTE: Power from IDU
Indoor unit 6#
HA HB
L6
L7
L8
L9
HA HB
L10
L11
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