33
Reversing Valve Operation
The reversing valve will enable if the
controller receives a 24VAC input on the “O”
terminal and the compressor has been
operational for a minimum of 5 seconds.
The default reversing valve position is for
heating operation, no 24VAC input on the
“O” terminal. Therefore, in compressor
cooling operation 24VAC must be applied to
the “O” terminal.
Random Start Delay
The controller will enter a random start delay
in these situations:
1) The unit powers up
2) Recovery from emergency shutdown
alarm
3) Recovery from high voltage alarm
4) Recovery from low voltage alarm
5) Night setback mode is disabled
The random start delay will be between 3 and
60 seconds. The fan and compressor will not
be operational during this time. The random
start delay will be ignored if the unit is in test
mode.
Building Occupancy Status
Occupied Mode
The controller will operate according to the
thermostat inputs.
Night Setback Mode
Night setback mode is enabled upon
receiving a 24VAC or a 24VAC common
input on the “NS” terminal. While in night
setback mode the controller will ignore the
normal thermostat signals. Instead the
controller will use the “NS_TH” input as the
fan and compressor enable signal operating at
full compressor capacity. When the unit is
taken out of night setback mode the controller
will execute a random start delay.
The night setback mode can be overridden
with a 24VAC input to the night setback
override terminal “NS_OV”. Once the
override signal is received, night setback will
be overridden for 2 hours even if the signal is
removed. While night setback is overridden
the controller will respond to the normal
thermostat signals.
Test Mode
Test mode is enabled by connecting the two
quick disconnect terminals “TEST” and
“TEST IN” together. The controller will
remain in “Test Mode” as long as the
terminals are connected to each other. The
controller will exit “Test Mode” immediately
upon removal of the jumper. While in “Test
Mode” there will be no random start delay,
and the compressor minimum on and
minimum off times are reduced to 5 seconds
each. The 5 second delay between
compressor and reversing valve operation is
still present as well as the 5 second delay
between the supply fan and compressor.
Alarms
LED Fault Codes
The controller provides a status LED (D5) in
the center of the board to indicate the unit
status. A green status light indicates that the
unit is powered up and that the controller is
not detecting any fault conditions. A flashing
red status light indicates that the controller
has detected a fault condition and is now in
alarm mode. The number of flashes indicates
what alarm is present. Table 8 describes the
meaning of the flash codes.
Summary of Contents for ProFit WV Series
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