Carrier WeatherMaster 48HC Series Installation Instructions Manual page 24

Typical
Thermostat
Connections
C
G
W2
W1
O/B/Y2
(Note 1)
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. 42 — Low-Voltage Thermostat Connections
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 in-
stallation 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 [95°F (35°C) minimum]. For 50 to 75
ft. (15 to 23 m), use no. 16 AWG insulated wire [95°F (35°C) min-
imum]. For over 75 ft. (23 m), use no. 14 AWG insulated wire
[95°F (35°C) minimum]. Wire sizes larger than no. 18 AWG can-
not be directly connected to the thermostat and will require a junc-
tion box and splice at the thermostat.
Thermostat Wiring, Units 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. 43.
NOTE: If thru-the-bottom connections accessory is used, refer to
the accessory installation instructions for information on routing
power and control wiring.
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Central
Terminal
Board
X
C
G
W2
W1
Y2
(Note 2)
Y1
R
search engine
RACEWAY
T
H
E
R
M
O
S
T
A
T
HOLE IN END PANEL (HIDDEN)
Fig. 43 — 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.
HUMIDI-MIZER
Humidi-MiZer
NOTE: The Humidi-MiZer system is a factory-installed option
which is only available for units equipped with belt-drive motors.
Humidi-MiZer system is not available for single phase (-3 voltage
code) models.
The Humidi-MiZer dehumidification system requires a field-sup-
plied and field-installed space relative humidity control device.
This device may be a separate humidistat control (contact closes
on rise in space RH above control setpoint) or a combination ther-
mostat-humidistat control device such as Carrier's Edge
Thermidistat™ device with isolated contact set for dehumidifica-
tion control. See Fig. 44 and 45. The humidistat is normally used
in applications where a temperature control is already provided
(units with PremierLink control).
Fig. 44 — Accessory Field-Installed Humidistat
24
CONTROL CONNECTIONS
®
® Space RH Controller
% RELATIVE HUMIDITY
® Pro