JOHNSON CONTROLS
73
SECTION 5 – SEQUENCE OF OPERATION
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
5
or under the COOLING SETUP tab in the Sim-
plicity PC software package.
•
“VAV COOLING SUPPLY AIR TEMP LOWER
SETPOINT”
– using Parameter 24 under the
PROGRAM key on the Simplicity control board
or under the COOLING SETUP tab in the Sim-
plicity PC software package.
•
“VAV SUPPLY AIR TEMP RESET SETPOINT”
–
using Parameter 25 under the PROGRAM key on
the Simplicity control board or under the COOL-
ING SETUP tab in the Simplicity PC software
package.
The Simplicity Control will control the operation of
the compressors as follows:
•
If the space temperature is 2.0° F or more above the
“VAV SUPPLY AIR TEMP RESET SETPOINT”
the control will use the
“VAV COOLING SUPPLY
AIR TEMP LOWER SETPOINT”
.
•
If the space temperature is not 2.0° F or more
above the
“VAV SUPPLY AIR TEMP RESET
SETPOINT”
the control will use the
“VAV COOL-
ING SUPPLY AIR TEMP UPPER SETPOINT”.
•
If the control is using the
“VAV COOLING
SUPPLY AIR TEMP LOWER SETPOINT”
per
above the space temperature must be equal to or
less than the
“VAV SUPPLY AIR TEMP RESET
SETPOINT”
before the control would switch to
the
“VAV COOLING SUPPLY AIR TEMP UP-
PER SETPOINT”
.
•
The control uses a 5-degree dead band around the
cooling “
VAV COOLING SUPPLY AIR TEMP
UPPER SETPOINT”
or
“VAV COOLING SUP-
PLY AIR TEMP LOWERT SETPOINT”
.
•
When the supply air temperature is 5.0° F or more
above the cooling
“VAV UPPER COOLING SAT
SETPOINT”
or
“VAV LOWER COOLING SAT
SETPOINT”
the Simplicity Control will energize
the first compressor.
•
The control records the supply air temperature
right before the compressor is turned ON and
compares it to the supply air temperature after 5
minutes of operation.
•
A second compressor will be turned ON if both of
the following criteria are met:
-
The supply air temperature is still 5.0° F or
more, greater than the
“VAV UPPER COOLING
SAT SETPOINT”
or
“VAV LOWER COOLING
SAT SETPOINT”
.
-
The Simplicity Control uses the temperature
difference calculated when the first compressor
was turned ON to verify the supply air tempera-
ture will not drop 5.0° F or more below the cool-
ing
“VAV UPPER COOLING SAT SETPOINT”
or
“VAV LOWER COOLING SAT SETPOINT”
.
If turning ON a compressor would result in the
specified drop in supply air temperature, the sec-
ond compressor will not be turned ON.
•
The same logic will be used to stage ON compres-
sor 3 and 4.
The Simplicity Control turns off compressor operation
as follows:
•
The supply air temperature is 5.0° F or more be-
low the
“VAV COOLING SUPPLY TEMP UPPER
SAT SETPOINT”
or
“VAV COOLING SUPPLY
AIR TEMP LOWER SETPOINT”
.
•
It has been more than 5-minutes since the last
compressor was turned ON.
•
The compressors will be turned off in the reverse
order they were turned ON.
Cooling – Unoccupied with a Hard Wired or
Communicated Space Sensor
The Simplicity Control cannot operate unoccupied
cooling with this method of control.
Heating – Occupied with a Hard Wired or
Communicated Space Sensor
The following parameters must be programmed into
the Simplicity Control:
•
“VAV OCCUPIED HEATING ENABLED”
– This
must be turned ON using Parameter 26 under the
PROGRAM key on the Simplicity control board
or under the HEATING SETUP tab in the Sim-
plicity PC software package.
•
“MORNING WARM UP/ VAV RETURN AIR
TEMP SETPOINT”
– using Parameter 29 under
the PROGRAM key on the Simplicity control
board or under the HEATING SETUP tab in the
Simplicity PC software package.
•
“VAV OCCUPIED HEATING SETPOINT”
– us-
ing Parameter 27 under the PROGRAM key on
the Simplicity control board or under the HEAT-
ING SETUP tab in the Simplicity PC software
package.
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