Carrier 39L - Manual (Page 52)

Field Wiring Connections — All field wiring must
comply with National Electric Code (NEC) and all local re-
quirements. The recommended wiring is as follows:
Dampers, actuators, — 4-conductor 20 AWG cable
and valves
(2 twisted pairs, unshielded)
Sensors — 2-conductor 20 AWG cable
(one twisted pair, unshielded)
Refer to Table 8 for recommended brands and part
numbers.
Table 8 — Recommended Sensor and
Device Wiring
MANUFACTURER
PART NUMBER
Regular* Plenum*
Alpha 1895 —
American A21501 A48301
Belden 8205 88442
Columbia D6451 —
Manhattan M13402 M64430
Quabik 6130 —
*Within a building.
NOTE: Wiring is 20 gage, 2-conductor twisted cable.
REMOTE LOCAL INTERFACE DEVICE (HSIO) — When
ordered as part of a 39L or 39NX unit, the HSIO is factory-
installed and fully wired.
To reinstall the HSIO in a remote location away from the
control box, refer to the factory wiring connections in
Fig. 9-12 and proceed as follows:
1. Use a 20 AWG 2-conductor twisted wire pair (Belden
No. 8205 or equivalent) to supply power to the HSIO mod-
ule. Use a 20 AWG 3-conductor cable shielded with drain
wire (Belden No. 8772 or equivalent) for communication
with the HSIO. Cable length must not exceed 1000 ft.
2. Pull the 2 cables (power and signal) through the electri-
cal conduit to the NEMA standard box or HSIO. Leave
approximately 4 ft of wire in the PIC control box for
terminations.
3. Route the cables from the PIC control box to the HSIO
bracket. Secure the HSIO cables to the existing cables
using either tie wraps or by twisting the HSIO cables around
the existing cables. Strip back the jacket 6 in. on each
cable after cutting off the excess. Connect the power cable
at the PIC control box to the existing 3-pin connector hang-
ing at the HSIO bracket. The wires should be terminated
in the screw-type locking clamps on Terminals 1 and 2.
4. Connect the signal cable at the PIC control box to the
existing 4-pin communications connector hanging at the
HSIO bracket. The wires should be terminated in the lock-
ing clamps on Terminals 1, 2, and 3. The shield should be
terminated at the HSIO bracket (ground). Be sure to note
the color coding used on the cable for later reference when
terminating the other end of the cable.
5. At the NEMA standard box or HSIO, connect the power
conductors to Pin 1 and 2 of the 3-pin plug. Using the
color coding from the above step, connect the signal cable
to Pin 1, Pin 2, and Pin 3 of the 4-pin communications
connector. Remove the shield and drain wire from this
end of the cable.
6. After the HSIO is installed inside the remote cover, con-
nect the 4-pin and 3-pin plugs to the HSIO.
RETURN-AIR TEMPERATURE SENSOR, OUTDOOR-
AIR TEMPERATURE SENSOR, ENTHALPY SWITCH,
AND MIXED-AIR TEMPERATURE SENSOR — Wires are
to be connected to the proper terminals on the processor mod-
ule. See Fig. 44 for details.
Select a 20 AWG twisted pair, no shield cable. Connect as
per table below:
SENSOR
PROCESSOR
MODULE
PIN NO.
Return-air temperature sensor (RAT) 20 and 21
Outside-air temperature sensor (OAT) 5 and 6
Enthalpy switch (ENT) 34 and TB2-3
Mixed-air temperature sensor (MAT) 8 and 9
Space temperature sensor (SPT) 17 and 18
NOTE: The MAT is factory wired on all units with a factory-installed
mixing box, filter mixing box, or air blender.
SPACE TEMPERATURE SENSOR (SPT) — The space tem-
perature sensor cover includes terminal block TB1, a jumper
between Pin E2 and Pin E3, and an RJ11 female connector.
The RJ11 female connector connects the service tool with
the Carrier Comfort Network.
Jumper MUST be in place between Pin E2 and Pin E3
or inaccurate readings could result. Ensure that the jumper
is in place before installing the sensor.
Using a 20 AWG twisted pair conductor cable rated for
the application, connect one wire of the twisted pair to
Terminal T1 and connect the other wire to Terminal T2 on
TB1. See Fig. 45.
The other ends of the wires are connected to the processor
(PSIO master) module. As polarity is not a consideration,
connect one wire to Terminal 17 and one wire to Terminal
18 of the processor module.
RJ11 Plug Wiring — Refer to the Carrier Comfort Network
Interface, page 64, for communication bus wiring and cable
selection. The cable selected must be identical to the CCN
communication bus wire used for the entire network.
Cut the CCN wire and strip the ends of the RED, WHITE,
and BLACK conductors. Insert and secure the RED (
ϩ) wire
to Pin J2 of the SPT terminal strip TB1. Insert and secure the
WHITE (ground) wire to Pin J3 of the SPT terminal strip
TB1. Insert and secure the BLACK (−) wire to Pin J5 of
SPT terminal strip TB1.
The other end of the communication bus cable must be
connected to the remainder of the CCN communication bus
at the COMM1 plug on the processor (PSIO master) mod-
ule. Refer to Carrier Comfort Network Interface section,
page 64, for more details.
DAMPER ACTUATORS — The PIC processor can activate
a field-installed modulating exhaust/relief damper. This is
achieved by wiring the factory-supplied damper actuator in
series with the factory-supplied and field-installed mixing
box damper actuator.
The PIC processor can also activate a field-installed damper
actuator mounted in a field-supplied mixing box. These ac-
tuators are available from the factory when ordered as an
option with the unit.
See Table 9 for recommended actuators.
NOTE: The actuator selected must be capable of receiving
a 4 to 20 mA signal and must have a total impedance of less
than 250 ohms. Wire should be 20 gage minimum, twisted-
pair type and rated for the application.
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