JRE-Series
R e v. : A u g u s t 1 9 , 2 0 2 0
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
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
19
Electrical – Thermostat Wiring
Thermostat Installation -
The thermostat should be
located on an interior wall in a larger room, away from
supply duct drafts. DO NOT locate the thermostat in areas
subject to sunlight, drafts or on external walls. The wire
access hole behind the thermostat may in certain cases
need to be sealed to prevent erroneous temperature
measurement. Position the thermostat back plate against
the wall so that it appears level and so the thermostat
wires protrude through the middle of the back plate. Mark
the position of the back plate mounting holes and drill
holes with a 3/16 inch (5 mm) bit. Install supplied anchors
and secure plate to the wall. Thermostat wire must be 18
AWG wire. Representative thermostat wiring is shown
in Figure 8 however, actual wiring connections should be
determined from the thermostat IOM and or unit wiring
diagram. Practically any heat pump thermostat will work
with Johnson Controls units, provided it has the correct
number of heating and cooling stages.
Figure 8: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2 Control
Thermostat
Compressor
Compressor Stage 2
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
DXM2
Board
Y1
Y2
W
H
O
G
R
C
AL1
Y1
Y2
W
DH
O
G
R
C
L
Dehumidification
Notes:
Auxiliary Heat
1) ECM automatic dehumidification mode operates with dehumidification airflows
in the cooling mode when the dehumidification output from thermostat is active.
Normal heating and cooling airflows are not affected.
2) DXM2 board DIP switch S2-7 must be in the auto dehumidification mode for
automatic dehumidification.
Comm +
A+
Comm -
B-
B-
OD
ID
GND
Outdoor
Sensor
(Optional)
Remote Indoor
Sensor
(Optional)
24Vac Common
Gnd
R
C
A+
