Tranquility
®
D i g i t a l ( D X M 2 ) — Tr o u b l e s h o o t i n g G u i d e
R e v. : 1 0 M a r c h , 2 0 1 5
12
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
Verifying Pump Feedback Signal
A-B
Contactor Chart
A-A
Contactor Chart
Contactor
closed
Motor does
not hum
Burned
contacts
Open in low
voltage circuit
Incorrect
wiring
Open motor
wiring
Open overload
switch
Motor hums, cuts off
on overload circuit
breaker or blows
fuses
Compressor tight or
stuck
High discharge
pressure not
equalized
Low line
voltage
Burnt out or
open winding
Non-condensibles in
refrigerant circuit
Contactor open
Buzzing
Check
contactor
Normal voltage
to coil
Contactor defective,
jammed or hung up
Low voltage
to coil
Wrong gauge of
thermostat wire
Low voltage from
transformer
Not buzzing
Loose
wire
No voltage
to coil
No power
to control circuit
Voltage
to coil
Coil open
circuited
P1
Alarm Relay
Comp Relay
O
Y1
Y2
W
G
C
R
AL1
24Vdc
EH1 EH2
P6
R
C
Off On
JW3
A
OV
R
ESD
C
R
NSB
AL2
JW1
Acc1 Relay
Acc2 Relay
H
CO
M
NC1
NO
1
CO
M
NC2
NO
2
P3
CO
RV
RV
LT1 LT1 LT2 LT2
LP LP
HP
HP
P7
Status
Fault
R
R
CC
CCG
CO
S1
S2
1
12
1
4
Factory Use
(240V
ac)
Com
N.O.
Fan Enable
5
1/
2"
7"
6
1/
2"
5"
Use 4 mounting screws
#6 sheet metal screw 1” long
1.5
3/8” standof
f
Factory lo
w
voltage mole
x
connection for unit harness
Factory lo
w
voltage mole
x
connection for electric heat
harness
Micr
o
U1
Off On
P2
COH
COM
AO2
P11
Gnd
T1
P10
T2
T2
T3
T3
T4
T4
T5
P9
T5
T6
T6
A0-1
A0-2
Off On
S3
RV Relay
CCH Relay
Test
P5
B-
Gnd
P4
A+
24V
(240V
ac)
Fan Speed
N.O.
N.C.
12V
OUT Gnd
P8
IN
NC
P12
Note: There is only one T1 connection
1 2 3 4
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
AO1
Gnd
0-2 VDC with pump on
3-4 VDC with pump off
Ensure correct wiring on T1=Yellow,
A0-2=White. If not, voltage may look
good but pump may not operate.
