c l i m a t e m a s t e r.c o m
65
TSM/TSL Vertical Stack
R e v. : J a n u a r y 1 8 , 2 0 2 1
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
Safety Features – CXM/DXM2 Controls, Cont’d.
a. The compressor is on in the cooling mode and the
LT1 sensor is colder than the LT2 sensor, or:
b. The compressor is on in the heating mode and the
LT2 sensor is colder than the LT1 sensor.
ESD (DXM2 only):
The ESD (Emergency Shut Down)
mode can be enabled from an external common signal to
terminal ESD to shut down the unit. The green status light
will flash code 3 when the unit is in ESD mode.
Diagnostic Features -
The LED on the CXM board
advises the technician of the current status of the CXM
control. The LED can display either the current CXM mode
or the last fault in memory if in test mode. If there is no
fault in memory, the LED will flash Code 1 (when in test
mode).
The green status LED and red fault LED on the DXM2
board advise the technician of the current status of the
DXM2 control. The status LED will indicate the current
mode that the DXM2 control is in. The fault LED will
ALWAYS flash a code representing the LAST fault in
memory. If there is no fault in memory, the fault LED will
flash Code 1. The yellow test LED will turn on when in
test mode.
CXM/DXM2 Control Start-up Operation -
The control
will not operate until all inputs and safety controls are
checked for normal conditions. The compressor will have
a 5 minute anti-short cycle delay at power-up. The first
time after power-up that there is a call for compressor,
the compressor will follow a 5 to 80 second random
start delay. After the random start delay and anti-short
cycle delay, the compressor relay will be energized. On all
subsequent compressor calls, the random start delay is
omitted.
DXM2 has 4 sensors that can be read with service tool
ACDU02C and harness 11B0100N27 or thermostat
ATC32U02C. Sensors are entering and leaving water
temperature, leaving air temperature, and discharge line
temperature. (See Figure 25)
⚠
CAUTION!
⚠
CAUTION!
Do not restart units without inspection and
remedy of faulting condition. Equipment damage may occur.
Figure 25: DXM2 Sensor Placement
17B0008N05
Leaving Air Temp Sensor
(White (2) Wires Connect
to DXM2-T4)
17B0030N06
Leaving Water Temp Sensor
(Yellow (2) Wires Connect
to DXM2-T2)
17B0031N04
Discharge Line Temp Sensor
(Black (2) Wires Connect
to DXM2-T6)
17B0030N05
Entering Water Temp Sensor
(Green (2) Wires Connect
to DXM2-T3)
LT1 Water Coil Protector
(Grey (2) Wires - Harness
to DXM2-LT1)
LT2 Air Coil Protector
(Violet (2) Wires - Harness
to DXM2-LT2)
Notes:
1. Sensors must be positioned on clean
section of copper tube approximately as
shown, clamped securely, and completely
wrapped (except Leaving Air Sensor - Do
Not wrap) with cork tape.
2. All sensors are NTC 10K OHM. To check
calibration use resistance table in DXM2
AOM.
