Carrier 50TC User Manual

Page 16

Field--supplied and field--installed liquidtight conduit

connectors and conduit may be attached to the connectors on

the basepan. Pull correctly rated high voltage and low

voltage wires through appropriate conduits. Connect the

power conduit to the internal disconnect (if unit is so

equipped) or to the external disconnect (through unit side

panel). Remove one of the two knockouts located on the

bottom left side of the unit control box. Use this hole for the

control conduit.

Units without Thru--Base Connections —

1. Install power wiring conduit through side panel open-

ings. Install conduit between disconnect and control

box.

2. Install power lines to terminal connections as shown

in Fig. 23.

Field Control Wiring —

The 50TC--16D requires an external temperature control

device. This device can be a thermostat (field--supplied)

or a PremierLink controller (available as factory--installed

option or as field--installed accessory, for use on a Carrier

Comfort Network or as a stand alone control) or the RTU

Open Controller for Building Management Systems using

non--CCN protocols (RTU Open is available as a

factory--installed option only).

Thermostat —

Select a Carrier--approved accessory thermostat. When

electric heat is installed in the 50HC unit, the thermostat

must be capable of energizing the G terminal (to energize

the Indoor Fan Contactor) whenever there is a space call

for heat (energizing the W1 terminal). The accessory

thermostats listed on the unit price pages can provide this

signal but they are not configured to enable this signal as

shipped.

Install the accessory thermostat according to installation

instructions included with the accessory.

Locate the thermostat accessory on a solid wall in the

conditioned space to sense average temperature in

accordance with the thermostat installation instructions.

If the thermostat contains a logic circuit requiring 24--v

power, use a thermostat cable or equivalent single leads of

different colors with minimum of seven leads. If the

thermostat does not require a 24--v source (no “C”

connection required), use a thermostat cable or equivalent

with minimum of six leads. Check the thermostat

installation instructions for additional features which

might require additional conductors in the cable.

For wire runs up to 50 ft. (15 m), use no. 18 AWG

(American Wire Gage) insulated wire (35_C minimum). For

50 to 75 ft. (15 to 23 m), use no. 16 AWG insulated wire

(35_C minimum). For over 75 ft. (23 m), use no. 14 AWG

insulated wire (35_C minimum). All wire sizes larger than

no. 18 AWG cannot be directly connected to the thermostat

and will require a junction box and splice at the thermostat.

O/B/Y2

T
H
E
R
M
O
S
T
A
T

(Note 1)

(Note 2)

Note 1: Typical multi-function marking. Follow manufacturer’s configuration

instructions to select Y2. Do not configure for O output.

Note 2: W connection(s) not required on units without electric heating.

Field Wiring

Central

Terminal

Board

Typical

Thermostat

Connections

C10909

Fig. 30 -- Typical Low--Voltage Control Connections

Unit without Thru--Base Connection Kit —

Pass the thermostat control wires through the bushing on the

unit end panel. Route the wire through the snap--in wire tie

and up to the web bushing near the control box. Route the

wire through the bushing and into the bottom left side of the

control box after removing one of the two knockouts in the

corner of the box. Use a connector at the control box to

protect the wire as it passes into the control box. Pull the

wires over to the terminal strip at the upper left corner of the

Central Terminal Board (CTB). Use the connector at the

control box and the wire tie to take up any slack in the

thermostat wire to ensure that it will not be damaged by

contact with the condenser coil. See Fig. 31.

C10018

Fig. 31 -- Thermostat Wire Routing

NOTE:

If thru--the--bottom connections accessory is

used, refer to the accessory installation instructions for
information on routing power and control wiring.

50TC

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