JOHNSON CONTROLS
87
SECTION 5 – SEQUENCE OF OPERATION
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
5
Sequence of Operation
When the unit is configured as a Constant Volume unit
with space sensor the Simplicity Control will use the
same logic for controlling compressors, economizer,
and heating that it would use with a space sensor but
uses the return air temperature input instead of the
space sensor.
When unit is configured for VAV with space sensor,
the Simplicity Elite control will use the return air
temperature in place of the space sensor to reset be-
tween the “
VAV COOLING SUPPLY AIR TEMP UP-
PER SETPOINT”
and the “
VAV COOLING SUPPLY
AIR TEMP LOWER SETPOINT”
based on the return
air temperature in relation to the
“VAV SUPPLY AIR
TEMP RESET SETPOINT”.
REMOTE CONTROL
This feature can be used on a VAV unit to send a hard-
wired 0 to 10 volts signal to the unit to vary the supply
air temperature setpoint between the
“VAV COOLING
SUPPLY AIR TEMP LOWER SETPOINT”
and
“VAV
COOLING SUPPLY AIR TEMP UPPER SETPOINT”
.
This feature will only work on a VAV unit with space
sensor control.
“REMOTE CONTROL INPUT ENABLE FOR THIRD
PARTY BAS”
must be enabled in order to use this fea-
ture by using Parameter 22 under the PROGRAM key
of the Simplicity Elite control board or under the SYS-
TEMS OPTIONS tab of the Simplicity PC software
package.
Sequence of Operation
The Simplicity Elite control will vary the active cool-
ing setpoint per the following:
•
Reset voltage less than 1.5VDC – No compressor
operation.
•
Reset voltage 1.5 to 2.0VDC -
“VAV COOLING
SUPPLY AIR TEMP LOWER SETPOINT”.
•
Reset voltage 10.0VDC - “
VAV COOLING SUP-
PLY AIR TEMP UPPER SETPOINT”.
•
Reset voltage between 2.0 and 10.0VDC – lin-
early between the
“VAV COOLING SUPPLY AIR
TEMP LOWER SETPOINT”
and
“VAV COOL-
ING SUPPLY AIR TEMP UPPER SETPOINT”.
•
The hard wired input is connected to the Simplici-
ty Elite control board at the
“REM+” and “REM-
“ terminals of the P19 connector
.
REDLINE
The feature can be used to temporally reduce the elec-
trical consumption of the unit by reducing the number
of compressor that are turned ON. This feature is only
available as a communicated input to the Simplicity
Elite control. The BACnet name is SET_REDLINE
and the BACnet instance number is BV12. For Mod-
bus use address (HEX) 41L, address (DEC) 65L Bit 0.
Sequence of Operation
If three or more compressors are energized when the
Simplicity Elite control receives this command the
Simplicity Control will turn off compressor number 3
and 4 if energized even if the minimum run time re-
quirement has not been met.
The Simplicity Elite control will keep the compressors
off line for 5 minutes. After 5 minutes, the Simplicity
Elite control will turn the compressor back ON with
a 30 second delay between compressors and resume
normal operation.
After 5 minutes Simplicity Elite control will reset this
communicated input back to “OFF” regardless of the
communicated status. To initiate another cycle the
communicated value would have to switch to the low
state “OFF” and then back to the high state “ON”.
LOADSHED
This feature can be used to temporally reduce the elec-
trical consumption of the unit by turning off all the
active compressors. The feature is only available as
a communicated input to the Simplicity Elite control.
The BACnet name is SET_LOADSHED and the BAC-
net instance number is BV13. For Modbus use address
(HEX) 41L, address (DEC) 65L Bit 1.
Sequence of Operation
If compressors are energized when the Simplicity Elite
control receives this command the Simplicity Elite
control will turn off all compressor immediately, even
if the minimum run time requirement has not been met
for the compressor.
The Simplicity Elite control will keep the compressors
off line for 5 minutes. After 5 minutes, the Simplicity
Elite control will turn the compressor back ON and re-
sume normal information. The same compressors that
were running before the Loadshed input was received
will be turned back ON with a 30 second delay be-
tween compressors.
Содержание 050
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