T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
Vertical Stack
R e v. : 0 4 / 2 4 / 2 0 1 9
37
c l i m a t e m a s t e r. c o m
Table 6 below lists recommended wire sizes and lengths
to install the thermostat. The total resistance of low-
voltage wiring must not exceed 1 ohm. Any resistance
in excess of 1 ohm may cause the control to malfunction
because of high voltage drop.
A91558
Series Thermostats have 6” (152) pigtail ending
with 9-pin Molex. This allows an easy connection to either
surface mount or remote with factory whip option.
AT
Series Thermostats have to be wired to screw
terminals under the cover.
Installation of Optional Wall-Mounted Thermostat -
The unit can be furnished with a 24-volt surface mounted
ACO or MCO control circuit or a remote 24-volt ACO or
MCO thermostat. A typical fi eld connection diagram is
shown in Figure 14. Refer to instructions provided with
remote thermostat for wiring instructions.
Low-voltage wiring between the unit and the wall
thermostat must comply with all applicable electrical
codes (i.e., NEC and local codes), and be completed
before the unit is installed. Use of eight wire, color-
coded, low-voltage cable is recommended.
Note: Your thermostat may require fewer than
8 connections, 8 wires allow future upgrading
thermostat. Tape off unused wires.
Note: All customer-supplied wiring to be copper only,
and must conform to NEC and local electrical codes.
Wiring shown with dashed lines must be fi eld-supplied
and fi eld-installed.
UNIT
JUNCTION
BOX
L1
L2 GND
R
C
C
G
Y
H
Y2
O
R
G
Y
O
24 Vac
Thermostat
PDB
DXM2
Line
Voltage
Digital 2 Heat, 2 Cool, MCO, or ACO
Will provide auto speed change (for CXM connect Y2 to
blower relay coil - see unit wire diagram).
Table 6: Recommended Thermostat Wire Sizes
WARNING!
Disconnect electrical power source to prevent
injury or death from electrical shock.
CAUTION!
Use copper conductors only to prevent
equipment
damage
Figure 14: Typical Field Connections for units
with Wall-Mounted 24V Thermostat
WARNING!
WARNING!
Zone integrity must be maintained to effi ciently
control units or groups of units. Unless zones of control are
considered and accounted for, adjacent units may operate in
heating and cooling modes simultaneously.
WIRE SIZE
MAX. WIRE LENGTH
22-Gauge
30 Feet
20-Gauge
50 Feet
18-Gauge
75 Feet
16-Gauge
125 Feet
14-Gauge
200 Feet
*Physical distance from thermostat to unit
Thermostat Installation
WARNING!
CAUTION!
Figure 9a: Communicating Thermostat to DXM2
iGate
®
Thermostat
ATC32U03
24Vac Hot
DXM2
24V
Comm +
A+
Comm -
B-
B-
OD
ID
GND
Outdoor
Sensor
(Optiona)
Remote Indoor
Sensor
(Optiona)
24Vac Common
Gnd
R
C
A+
Unit wiring diagrams available at www.climatemaster.com.
Select ‘Commercial Professional ‘, ‘ Literature ‘,
‘ Wiring Diagrams’
.
