Service manual

THE SMART SOLUTION FOR ENERGY EFFICIENCY
Vertical Stack
Rev.: 11/09/12
37
climatemaster.com
UPS warning code = 8
Swapped FP1/FP2 thermistors: During test mode, the
control monitors to see if the FP1 and FP2 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
FP1 sensor is colder than the FP2 sensor, or:
b. The compressor is on in the heating mode and the
FP2 sensor is colder than the FP1 sensor.
Swapped FP1/FP2 thermistor code = 9.
ESD (DXM 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 fl 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 fl ash Code 1 (when in
test mode).
The green status LED and red fault LED on the DXM
board advise the technician of the current status of the
DXM control. The status LED will indicate the current
mode that the DXM control is in. The fault LED will
ALWAYS fl ash a code representing the LAST fault in
memory. If there is no fault in memory, the fault LED will
fl ash Code 1. The yellow test LED will turn on when in
test mode.
CXM/DXM 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 fi 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.
 CAUTION! 
CAUTION! Do not restart units without inspection and
remedy of faulting condition. Equipment damage may occur.
Environment - This unit is designed for indoor
installation only. Do not install in an area subject to
freezing or where humidity levels can cause cabinet
condensation.
Power Supply - A voltage variation of +/- 10% of
nameplate utilization voltage is acceptable.
Operation and performance is primarily dependent
upon return air temperature, airfl ow, water temperature,
water fl ow rate and ambient air temperature. This water
to air heat pump is capable of operating over a wide
temperature range and with fl ow rates of between 1.5
GPM (.1 l/s) and 3 GPM (.19 l/s) per ton, however usually
no more than one of these factors may be at a minimum
or maximum level at a time.
The commissioning table indicates air and water
temperatures which are suitable for initial unit
commissioning in an environment where the fl ow rate
and water temperature is not yet stable and to avoid
nuisance shut down of the units freeze and refrigerant
pressure safeties.
The operating table indicates the maximum and
minimum ranges of the unit.
For more specifi c unit performance reference the product
catalog, the submittal data sheets or contact your
supplier for assistance.
UNIT COMMISSIONING AND OPERATING CONDITIONS