10
4.
Communication wire must not form a closed loop.
OPTION/EXTENSIONS OF COMMUNICATION WIR-
ING — To extend control wiring or make terminal connec-
tions, use the PQE connection wire supplied in the accessory
kit and follow the steps below.
1.
Cut the connector on the outdoor unit side as shown in
Fig. 17 below.
2.
Strip a suitable length of the insulation layer as shown in
Fig. 18 below.
3.
Use a suitable screwdriver to fix the communication wire
on the outdoor unit communication terminal as shown in
Fig. 19 below.
If communication wires are use to connect indoor units,
then find the corresponding port and plug it directly as shown
in Fig. 20.
If for any reason it is not possible to buy communication
wires from Carrier, connect the indoor unit side of the commu-
nication wires using the connector provided with the accesso-
ries as shown in Fig. 21 below. See Fig. 22 and 23 for typical
communication wiring of the heat pump and heat recovery sys-
tems.
Fig. 16 — Communication Wire Connection
To outdoor/indoor/MDC units
comm. bus
To wired controller comm. bus
XT2
+$+%
34
34
34
LEGEND
ACB
—
Auxiliary Control Board
Fig. 17 — Shearing Outdoor Connector
Fig. 18 — Stripping The Wire
CAUTION
Failure to follow these procedures may result in personal
injury or damage to equipment.
NEVER CONNECT the main power source to the control
or communication terminal block.
USE AN APPROPRIATE SCREWDRIVER for tighten-
ing the terminal screws. Do not over tighten the terminal
screws.
IMPORTANT:
Wiring for communication shall be 2 in. or
more apart from power source wiring to avoid electric
noise. (Do not insert control/communication and power
source wire in the same conduit.)
Pay attention to the polarity of the communication
wire.
Fig. 19 — Connecting Communication Wire to
Outdoor Unit Communication Terminal
Fig. 20 — Connecting the Communication Wires
Connector in accessory kit
Connector on indoor unit
Communication cable
in field
Fig. 21 — Connecting the Communication Cable to Indoor Unit Using the Supplied Connector
Summary of Contents for 40VMU012 Series
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