Factory- Option Thru-Base Connections --
This service connection kit consists of a 1/2-in electrical
bulkhead connector and a 3/4-in electrical bulkhead
connector, all factory-installed in the embossed (raised)
section of the unit basepan in the condenser section. The
3/4-in bulkhead connector enables the low-voltage control
wires to pass through the basepan. The 1/2-in electrical
bulkhead connector allows the high-voltage power wires
to pass through the basepan. See Fig. 24.
LOW VOLTAGE
. CONDUIT
ECTOR
/ _ HIGH VOLTAGE
" CONDUIT
CONNECTOR
C13412
Fig. 24 - Thru-Base Connection Fittings
Check tightness of connector lock nuts before connecting
electrical conduits.
Field-supplied and field-installed liquid tight 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. 15.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 10. On 3-phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use
the formula shown in the legend for Table 10, Note 2 to
determine the percent of voltage imbalance. 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
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 50TC 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 Wl 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 (95°F)
minimum]. For 50 to 75 ft. (15 to 23 m), use no. 16 AWG
insulated wire [35°C (95°F) minimum]. For over 75 ft.
(23 m), use no. 14 AWG insulated wire [35°C (95°F)
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.
Ttypical
Thermostat
Corrections
©
@
@
@
@
(Note 1)
©
@
(Note 3)
(Note 2)
Central
Terminal
Board
Fq
Fq
T
H
E
R
M
O
S
T
A
T
Note 1 : Typical multi-function marking. Follow manufacturer's confi(
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. 25 - Low-Voltage Connections
uration
C08575
16
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