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 P U M P S
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C l i m a t e M a s t e r Wa t e r - S o u rc e H e a t P u m p s
Safety Features - CXM/DXM Controls
Safety Features – CXM/DXM Control -
The safety
features below are provided to protect the compressor,
heat exchangers, wiring and other components from
damage caused by operation outside of design
conditions.
Anti-short cycle protection: The control features a 5
minute anti-short cycle protection for the compressor.
Note: The 5 minute anti-short cycle also occurs at
power up.
Random start:
The control features a random start upon
power up of 5-80 seconds.
Fault Retry:
In Fault Retry mode, the Status LED begins
slowly fl ashing to signal that the control is trying to
recover from a fault input. The control will stage off the
outputs and then “try again” to satisfy the thermostat
input call. Once the thermostat input call is satisfi ed,
the control will continue on as if no fault occurred. If 3
consecutive faults occur without satisfying the thermostat
input call, the control will go into “lockout” mode. The
last fault causing the lockout will be stored in memory
and can be viewed at the “fault” LED (DXM board) or by
going into test mode (CXM board). Note: LT1/LT2 faults
are factory set at only one try.
Lockout:
In lockout mode, the status LED will begin fast
fl ashing. The compressor relay is turned off immediately.
Lockout mode can be “soft” reset by turning off the
thermostat (or satisfying the call). A “soft” reset keeps
the fault in memory but resets the control. A “hard”
reset (disconnecting power to the control) resets the
control and erases fault memory.
Lockout with emergency heat:
While in lockout mode,
if W becomes active (CXM), emergency heat mode will
occur. If DXM is confi gured for heat pump thermostat
type (DIP 1.3), emergency heat will become active if O/
W2 is energized.
High pressure switch:
When the high pressure switch
opens due to high refrigerant pressures, the compressor
relay is de-energized immediately since the high pressure
switch is in series with the compressor contactor coil. The
high pressure fault recognition is immediate (does not
delay for 30 continuous seconds before de-energizing
the compressor).
High pressure lockout code = 2
Example: 2 quick fl ashes, 10 sec pause, 2 quick fl ashes, 10
sec. pause, etc.
Low pressure switch:
The low pressure switch must be
open and remain open for 30 continuous seconds during
“on” cycle to be recognized as a low pressure fault. If
the low pressure switch is open for 30 seconds prior to
compressor power up it will be considered a low pressure
(loss of charge) fault. The low pressure switch input is
bypassed for the initial 120 seconds of a compressor
run cycle.
Low pressure lockout code = 3
Water coil low temperature (LT1):
The LT1 thermistor
temperature must be below the selected low
temperature limit setting for 30 continuous seconds
during a compressor run cycle to be recognized as a LT1
fault. The LT1 input is bypassed for the initial 120 seconds
of a compressor run cycle. LT1 is set at the factory for one
try. Therefore, the control will go into lockout mode once
the LT1 fault has occurred.
LT1 lockout code = 4
Air coil low temperature (LT2):
The LT2 thermistor
temperature must be below the selected low
temperature limit setting for 30 continuous seconds
during a compressor run cycle to be recognized as a LT2
fault. The LT2 input is bypassed for the initial 60 seconds
of a compressor run cycle. LT2 is set at the factory for one
try. Therefore, the control will go into lockout mode once
the LT2 fault has occurred.
LT2 lockout code = 5
Condensate overfl ow:
The condensate overfl ow sensor
must sense overfl ow level for 30 continuous seconds to
be recognized as a CO fault. Condensate overfl ow will be
monitored at all times.
CO lockout code = 6
Over/under voltage shutdown:
An over/under voltage
condition exists when the control voltage is outside the
range of 19VAC to 30VAC. Over/under voltage shut
down is a self-resetting safety. If the voltage comes back
within range for at least 0.5 seconds, normal operation
is restored. This is not considered a fault or lockout. If
the CXM/DXM is in over/under voltage shutdown for 15
minutes, the alarm relay will close.
Over/under voltage shut down code = 7
Unit Performance Sentinel-UPS (patent pending): The
UPS feature indicates when the heat pump is operating
ineffi ciently. 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.
