Units Without Thru- - Base Connections; Field Control Wiring; Thermostat; Unit Without Thru- - Base Connection Kit - Carrier 48HC Installation Instructions Manual

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. 24.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Tables 10 and 11. 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 Tables 10
and 11, 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 48HC 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 —
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
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.
Typical

Thermostat

Connections
C
G
W2
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.
Field Wiring
Fig. 35 - - Low- - Voltage Connections
Unit without Thru- - Base Connection Kit —
Pass the thermostat control wires through the hole
provided in the corner post; 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 Controls Connection Board. See Fig. 36.
NOTE: If thru- - the- - bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 36 - - Field Control Wiring Raceway
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.
20
Central
Terminal
Board
X
C
T
H
G
E
R
W2
M
O
W1
S
T
Y2
A
T
Y1
R
C08069
C08027