WaterFurnace Envisio Series Console - Manual (Page 33)

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ENVISION CONSOLE INSTALLATION MANUAL
mode. The delay should not be less than 1 second and not
longer than 120 seconds. If the control is in test mode the
random start delay will be shortened to 5 seconds.
Compressor Fixed On Delay Time
The Compressor Fixed On Delay Time will ensure that the
compressor output (B02) is not enabled for (90) seconds
after the control receives a call to start the compressor.
This delay is adjustable from 30 – 300 seconds over a BAS
or a MUI. If the control is in test mode the Compressor
Fixed On Delay Timer will be shortened to 5 seconds.
Compressor Minimum On Delay
The compressor minimum on delay will ensure that the
compressor output is enabled for a minimum of (2)
minute each time the compressor output is enabled. This
will apply in every instance except in the event the high
pressure switch is tripped or emergency shutdown then
the compressor output will be disable immediately.
Compressor Short Cycle Delay Time
The compressor short cycle time delay will ensure that
the compressor output will not be enabled for a minimum
of (5) minutes after it is disabled. This allows for the
system refrigerant pressures to equalize after the
compressor is disabled.
Heating Cycle
On a call for heating, the blower enable output and
accessory output 2 will turn on immediately after the
random start delay timer has been satisfied. If the
compressor short cycle time delay has been satisfied,
the compressor will turn on after the blower enable and
accessory output 2 are on and the fixed compressor start
delay timers have been satisfied.
Auxiliary heat output can be controlled over the BAS.
Set Point Control Mode
In set point control mode the reversing valve output
will be disabled. As the temperature drops below the
heating set point and begins to operate in the heating
proportional band, the low capacity compressor
output (BO-2) will be enabled. A PI loop in the
programming of the control will determine when
the full capacity compressor output (BO-4) is to be
enabled. The compressor must be operating in low
capacity for a minimum of 30 seconds before the full
capacity compressor output can be enabled.
Thermostat Control Mode
In thermostat mode the compressor will be cycled
based on Y1 calls from a room thermostat. When
the control receives a Y1 command (BI-7) from the
thermostat, the compressor output (BO2) will be
enabled. During the heating cycle the reversing valve
will be commanded into the off position.
Cooling Cycle
On a call for cooling, the blower enable output and
accessory output 2 will turn on immediately after the
random start delay timer has been satisfied. If the
compressor short cycle time delay has been satisfied,
the compressor will turn on after the blower enable and
accessory output 2 are on and the fixed compressor start
delay timers have been satisfied.
Set Point Control Mode
In set point control mode the reversing valve output
will be enabled. As the temperature falls below the
cooling set point and begins to operate in the cooling
proportional band, the low capacity compressor
output (BO-2) will be enabled. A PI loop in the
programming of the control will determine when
the full capacity compressor output (BO-4) is to be
enabled. The compressor must be operating in low
capacity for a minimum of 30 seconds before the full
capacity compressor output can be enabled.
Thermostat Control Mode
In thermostat mode the compressor will be cycled
based on Y1 calls from a room thermostat. When
the control receives a Y1 command (BI-7) from the
thermostat, the compressor output (BO2) will be
enabled. During the cooling cycle the reversing valve
will be commanded into the “ON” position.
Emergency Heat/Network Enabled Output (BO5)
This output is set from the factory to enable/disable
emergency heat. If a problem occurs with the unit resulting
in the compressor being locked out in heating mode,
the control will automatically enable this output to turn
on field installed electric heat. This output is interlocked
with the blower proving input BI-6 (Blower proving
sensors must be field supplied and installed). BI-6 must
be connected to PB2 position 3 (see unit schematic) in
the field if no blower proving sensor is desired. There is a
configurable parameter available through a BAS network
that must be enabled if this output is to be commanded
over the BAS network.
MUI Alarm History Reporting
If a fault occurs the fault will be recorded in history for
display on the medium user interface in the History Menu.
Each fault type will be displayed in the history menu with
a number between 0 and 3. A reading of 3+ will mean
that fault has occurred more than three times in the past.
The history menu can be cleared with a power cycle only.
Alarm date and time are not included in the history.
Envision Console Controls cont.