Units Without Thru-Base Connections; Thermostat; Typical Low-Voltage Control Connections; Heat Anticipator Settings - Carrier 50TC Installation Instructions Manual

Check tightness of connector lock nuts before connecting
electrical conduits.
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 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). A
hole must be field cut in the main control box bottom on
the left side so the 24- - v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.
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. 18.
All Units —
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On
3- - phase units, voltages between phases must be balanced
within 2% and the current within 10%. Use the following
formula to determine the percent of voltage imbalance.
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate
any applicable Carrier warranty.
Field Control Wiring —
The 50TC unit 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- - MP Controller for Building Management Systems
using non- - CCN protocols (RTU- - MP is available as a
factory- - installed option only).
Thermostat —
Install a Carrier- - approved accessory thermostat according to
installation instructions included with the accessory. For
complete economizer function, select a two- - stage cooling
thermostat. 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
average voltage
C09103
installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 15 m (50 ft.), use no. 18 AWG
(American Wire Gage) insulated wire (35_C minimum).
For 15 to 23 m (50 to 75 ft.), use no. 16 AWG insulated
wire (35_C minimum). For over 23 m (75 ft.), 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.
Typical

Thermostat

Connections
C
G
W2
(Note 3)
W1
O/B/Y2
(Note 1) (Note 2)
Y1
R
Note 1: Typical multi-function marking. Follow manufacturer's configuration
instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired
Note 3: W2 connection not required on units with single-stage heating.
Field Wiring
Fig. 20 - - Typical Low- - Voltage Control Connections
Unit without thru- - base connection kit —
Pass the thermostat control wires through the hole
provided in the end panel (see item "D" in the view
labeled "LEFT" in Fig. 1 and Fig. 2); then feed the wires
through the raceway built into the corner post to the
control box. Pull the wires over to the terminal strip on the
upper- - left corner of the Central Terminal Board. (CTB)
See Fig. 21.
NOTE:
If thru- - the- - bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second- - stage heating, when available.
15
Central
Terminal
Board
X X
C C
G G
W2 W2
W1 W1
Y2 Y2
Y1 Y1
R
R
T–STAT
C09459