Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual page 35

Heat Controller, Inc.
Safety Features - CXM Controls
Safety Features:
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 flashing 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 satisfied, 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 by going into test
mode. Note: FP1/FP2 faults are factory
set at only one try.
Lockout: In Lockout Mode, the Status LED
will begin fast flashing. 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.
High Pressure Switch: When the high
pressure switch opens due to high refrigerant
pressures, the compressor relay is
SAFETY FEATURES - CXM CONTROLS
HTV/HTD/HTH SERIES
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 flashes, 10 sec pause, 2
quick flashes, 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 60 seconds of a
compressor run cycle.
Low pressure lockout code = 3
Water Coil Low Temperature (FP1): The
FP1 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 FP1 fault.
The FP1 input is bypassed for the initial 60
seconds of a compressor run cycle. FP1 is
set at the factory for one try. Therefore, the
control will go into lockout mode once the
FP1 fault has occurred.
FP1 lockout code = 4
Air Coil Low Temperature (FP2): The FP2
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 FP2 fault. The
FP2 input is bypassed for the initial 60
seconds of a compressor run cycle. FP2 is
set at the factory for one try. Therefore, the
control will go into lockout mode once the
FP2 fault has occurred.
FP2 lockout code = 5
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