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JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
5
• 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
COOLING SETPOINT” plus 5.1° F Simplic-
ity Control will keep the compressor 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 back on provided
there is still a demand for the staged off compres-
sor.
If multiple compressors are energized 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 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 sup-
ply air temperature is equal to or greater than
the “SUPPLY 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 compres-
sor.
• 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 provided
there is still a demand for the staged off compres-
sor.
Heating
The following System Parameters must be
programmed:
“SUPPLY AIR TEMP LIMIT FOR HEATING
ENABLED”- must be enabled using Parameter 16 under
the PROGRAM key on the Simplicity control 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 Simplicity 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
supply 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.