climatemaster.com
61
Tranquility
®
Compact (TC) Series
Rev.: July 7, 2020
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Safety Features – CXM and DXM2 Controls, Cont’d.
Unit Performance Sentinel-UPS (patent pending): The
UPS feature indicates when the heat pump is operating
inefciently. A UPS condition exists when:
a. In heating mode with compressor energized, LT2 is
greater than 125°F [52°C] for 30 continuous seconds,
or:
b. In cooling mode with compressor energized, LT1 is
greater than 125°F [52°C] for 30 continuous seconds,
or:
c. In cooling mode with compressor energized, LT2 is less
than 40°F [4.5°C] for 30 continuous seconds.
If a UPS condition occurs, the control will immediately
go to UPS warning. The status LED will remain on as
if the control is in normal mode. Outputs of the control,
excluding LED and alarm relay, will NOT be affected
by UPS. The UPS condition cannot occur during a
compressor off cycle. During UPS warning, the alarm
relay will cycle on and off. The cycle rate will be “on” for 5
seconds, “off” for 25 seconds, “on” for 5 seconds, “off” for
25 seconds, etc.
UPS warning code = 8
Swapped LT1/LT2 thermistors: During test mode, the
control monitors to see if the LT1 and LT2 thermistors are
in the appropriate places. If the control is in test mode, the
control will lockout with code 9 after 30 seconds if:
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.
Swapped LT1/LT2 thermistor code = 9.
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 ash code 3 when the unit is in ESD mode.
ESD mode = code 3 (green “status” LED)
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
ash 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 ash a code representing the LAST fault in
memory. If there is no fault in memory, the fault LED
will ash Code 1. The yellow test LED will turn on when
in test mode. CAUTION: Do not restart units without
inspection and remedy of faulting condition. Damage
may occur.
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 rst 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.
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