C L I M AT E M A S T E R W AT E R - S O U R C E H E AT P U M P S
C o n s o l e s
R e v. : 5 N o v. , 2 0 0 9 B
36
C l i m a t e M a s t e r W a t e r- S o u r c e H e a t i n g a n d C o o l i n g S y s t e m s
Safety Features - CXM/DXM Controls
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 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)
CXM/DXM Controls
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.
CAUTION:
Do not restart units without inspection and remedy of
faulting condition. Damage may occur.
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.
