Dxm2 Layout And Connection - ClimateMaster Tranquility 30 Digital TE Series Installation, Operation & Maintenance Instructions Manual

Tranquility 30 Digital ( TE) Series IOM - 60Hz HFC-410A
®
R e v . : O c t o b e r 5 , 2 0 2 1
DXM2 Layout and Connections
Low Water Temperature Cutout Selection
The DXM2 control allows the field selection of low water
(or water-antifreeze solution) temperature limit by clipping
jumper JW3, which changes the fault cutout temperature
associated with thermistor LT1. Note that the LT1 thermistor
is located on the refrigerant line between the coaxial heat
exchanger and expansion device (TXV). Therefore, LT1
is sensing refrigerant temperature, not water temperature,
which is a better indication of how water flow rate/
temperature is affecting the refrigeration circuit.
The factory setting for LT1 is for systems using water
(30°F [-1.1°C] refrigerant temperature cutout or fallout). In
low water temperature (extended range) applications with
antifreeze (most ground loops), jumper JW3 should be
clipped as shown in Figure 31 to change the setting to 10°F
[-12.2°C] refrigerant cutout or fallout temperature, a more
suitable temperature when using an antifreeze solution. All
residential units include water/refrigerant circuit insulation to
prevent internal condensation,
which is required when
operating with entering water
temperatures below 59°F
[15°C].
40
P1
Y1
Y2
W
O
G
R
C
AL1
P2
AL2
R
NSB
C
ESD
7"
OVR
H
A
P3
R
NO1
NC1
COM
NO2
NC2
COM
R
Figure 32: DXM2 Layout and Connections
Service tool
connection
P1
Y1
Y2
W
Conventional
O
stat connection
G
R
C
AL1
P2
AL2
R
Cabinet
NSB
temperature
Alarm
Relay
sensor
C
(with variable
ESD
speed pump)
7"
OVR
H
A
Communications
and HWG P3
Settings
R
NO1
NC1
Accessory
COM1
relays refer
NO2
to DXM2 AOM
NC2
for configuration
COM2
R
24V to compressor
second-stage solenoid
for Y2/full
load capacity
G e o t h e r m a l H e a t i n g a n d C o o l i n g
R P5
Com
Fan Enable
Micro
JW1 U1
Alarm
Relay
Figure 31: LT1 Limit Setting
Fault Status
Off On
Off
S3
Off On
S2
Acc1
Relay
A0-1 A0-2
S1
Acc2
Relay
P11
AO1 Gnd Gnd T1 T2 T2 T3 T3 T4 T4
AO2
5 1/2"
Note: There is only
one T1 connection
JW3-LT1 jumper should be clipped
for low temperature (antifreeze) operation
Communicating
5"
stat connection
P4
C
Gnd (240Vac)
B- A+ 24V
R P5
Com
Fan Enable
Test
Micro
JW1
U1
Fault Status
Off On
Off On
S3
Off On
S2
Acc1
Relay A0-1 A0-2
S1
Acc2
Relay
P11 P10
Gnd Gnd T1 T2 T2 T3 T3 T4 T4
AO1 AO2
5 1/2"
Note: There is only
one T1 connection
N.C.
N.O.
N.O.
Fan Speed
P8
Test 12V
P12
IN
1
OUT
Gnd
NC
1
HP
HP
LP
LP 6 1/2"
LT1
LT1
LT2
LT2
RV
On
RV
CO
JW3
12
CO
P7
RV
Relay
CCH
1
24Vdc
Relay
EH1
4
EH2
P6
Comp
Relay
CCG
CC
P10 P9
T5 T5 T6 T6
DXM2 PCB
Use 4 mounting screws
#6 sheet metal screw 1" long
(240Vac)
N.C.
N.O.
N.O.
Fan Speed
Test Button
to Speed up
Time Delays
P8
12V
P12
IN
1
ECM Motor
OUT
Connection
Gnd
NC
Water Coil
Low Temp
Limit Setting.
JW3-LT1 jumper
1
HP
should be clipped
HP
for low temp
LP
(antifreeze)
6 1/2"
LP
operation
LT1
LT1
Factory low
LT2
voltage Molex
LT2
connection for
RV
unit harness
RV
CO
JW3
12
CO
P7
RV
Relay
CCH
1 Electric heat
24Vdc
Relay
connection
EH1
4
EH2
P6
Comp
Relay
CCG
Configure
modulating valve
or variable
CC
P9
speed pump
T5 T5 T6 T6
Use 4 mounting screws
Use 4 mounting screws
#6 sheet metal screw
#6 sheet metal screw 1" long
1" long
Factory low
voltage Molex
connection for
unit harness
Factory low
voltage Molex
connection for
electric heat
harness
3/8"
1.5
Factory low
voltage mole
connection for
unit harness
Factory low
voltage molex
connection for
electric heat
harness