JOHNSON CONTROLS
85
SECTION 5 – SEQUENCE OF OPERATION
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
5
•
“SUPPLY AIR TEMP LIMIT COOLING
SETPOINT”
– Using Parameter 15 under the
PROGRAM key on the Simplicity control board
or under the COOLING SETUP tab in the Sim-
plicity PC software package.
If a single compressor is energized the control will
monitor the supply air temperature and respond as fol-
lows:
•
The Simplicity Control will monitor the supply
air temperature and compare it to the
“SUPPLY
AIR TEMP LIMIT COOLING SETPOINT”
. If the
supply air temperature is 0.1° F or more below
this value and the compressor minimum run time
requirement has been met the Simplicity Control
will turn off the compressor.
•
The Simplicity Control then starts a 10-minute
timer.
•
If after 10 minutes the supply air temperature is
equal to or greater than the
“SUPPLY AIR TEMP
LIMIT COOLING SETPOINT”
plus 5.1° F the
Simplicity Control will turn the compressor back
ON provided there is still a demand for the staged
off compressor.
•
If after 10 minutes the supply air temperature is not
less than the
“SUPPLY AIR TEMP LIMIT COOL-
ING SETPOINT”
plus 5.1° F Simplicity Control
will keep the compressor off until the supply air
temperature is equal to or greater than the
“SUP-
PLY AIR TEMP LIMIT COOLING SETPOINT”
plus 5.1° F. The Simplicity Control will then turn
the compressor back ON provided there is still a
demand for the staged off compressor.
If multiple compressors are energized the control will
monitor the supply air temperature and respond as fol-
lows:
•
The Simplicity Control will monitor the supply
air temperature and compare it to the
“SUPPLY
AIR TEMP LIMIT COOLING SETPOINT”.
If the
supply air temperature is 0.1° F or more below
this value and the compressor minimum run time
requirement has been met the Simplicity Control
will turn off the compressor with the shortest run
time.
•
The Simplicity Control starts a 10 minute and 3
minute timing sequence.
•
If after 3 minutes, the supply air temperature is
still 0.1° F below the
“SUPPLY AIR TEMP LIMIT
COOLING SETPOINT”
the control will turn off
the next compressor with the shortest run time.
•
The Simplicity Control will continue to turn off
compressors every 3 minutes until the supply air
temperature is equal to or greater than the
“SUP-
PLY AIR TEMP LIMIT COOLING SETPOINT”.
•
If after 10 minutes the supply air temperature
is equal to or greater than the
“SUPPLY AIR
TEMP LIMIT COOLING SETPOINT”
plus 5.1°
F the Simplicity Control will turn the staged off
compressor(s) back ON provided there is still a
demand for the use of the staged off compressor.
•
If after 10 minutes the supply air temperature is
not less than the
“SUPPLY AIR TEMP LIMIT
COOLING SETPOINT”
plus 5.1° F the Simplic-
ity Control will keep the compressor(s) off until
the supply air temperature is equal to or greater
than the
“SUPPLY AIR TEMP LIMIT COOLING
SETPOINT”
plus 5.1° F. The Simplicity Control
will then turn the compressor(s) back ON provid-
ed there is still a demand for the staged off com-
pressor.
Heating
The following System Parameters must be pro-
grammed:
•
“SUPPLY AIR TEMP LIMIT FOR HEATING EN-
ABLED”
- must be enabled using Parameter 16
under the PROGRAM key on the Simplicity con-
trol board or under the HEATING SETUP tab in
the Simplicity PC software package.
•
“SUPPLY AIR TEMP LIMIT HEATING
SETPOINT”
– Using Parameter 17 under the
PROGRAM key on the Simplicity control board
or under the HEATING SETUP tab in the Sim-
plicity PC software package.
If a single heat stage is ON the control will monitor the
supply air temperature and respond as follows:
•
The Simplicity Control will monitor the supply air
temperature and compare it to the
“SUPPLY AIR
TEMP LIMIT HEATING SETPOINT”.
If the sup-
ply air temperature is 0.1° F or more above this
value and the heat stage minimum run time has
been met the Simplicity Control will turn off the
heat stage.