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82
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Sequence of Operation
Sequence of Operation
Tables 5-4 thru 5-6 use the following defi nitions:
• SAT COMFORT ZONE – the temperature be-
tween the “COMFORT VENTILATION LOWER
SETPOINT” minus 1.0° F and the “COMFORT
VENTILATION UPPER SETPOINT” plus 1.0°
F.
• OAT COMFORT ZONE - the temperature be-
tween the “COMFORT VENTILATION LOWER
SETPOINT” and the “COMFORT VENTILA-
TION UPPER SETPOINT”.
• OAT – Outdoor Air Temperature.
• SAT – Supply Air Temperature.
• ECON OPERATION – Economizer damper will
open to BRING SAT into the SAT COMFORT
ZONE.
Conditions of Operation
• In order for compressor operation “COMFORT
VENTILATION FOR COOLING ENABLED”
must be enabled.
• In order for heat stages to operate “COMFORT
VENTILATION FOR HEATING ENABLED”
must be enabled.
• Economizer operation will occur with either, or
both, “COMFORT VENTILATION FOR COOL-
ING ENABLED” or “COMFORT VENTILA-
TION FOR HEATING ENABLED” enabled.
EXCESSIVE SAT (SUPPLY AIR TEMPERATURE)
CONTROL
This feature is only available on Constant Volume
units. On a Constant Volume unit, the compressors
and heat stages are control by the space temperature
only, either by thermostat or zone sensor. As long as
the room device is calling for cooling or heating the
compressors or heating section does not control the
actual temperature of the supply air leaving the unit.
The enabling of this feature adds a means to prevent low
or high supply air temperatures from being delivered to
the conditioned space.
Cooling
The following System Parameters must be
programmed:
“SUPPLY AIR TEMP LIMIT FOR COOLING
ENABLED”- must be enabled using Parameter 14 under
the PROGRAM key on the Simplicity control board or
under the COOLING SETUP tab in the Simplicity PC
software package.
“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 Simplicity PC software package.
If a single compressor is energized the control will
monitor the supply air temperature and respond as
follows:
TABLE 5-6 HEAT STAGE ON WHEN SPACE INPUT SATISFIED
OAT VS OAT COMFORT ZONE SAT VS SAT COMFORT ZONE ECON OPERATION HEAT STAGE COMP STAGE
BELOW ABOVE OPEN LEAVE ON* -
BELOW BELOW - LEAVE ON -
BELOW WITHIN - LEAVE ON -
ABOVE ABOVE - TURN OFF TURN ON
ABOVE BELOW OPEN TURN OFF -
ABOVE WITHIN - TURN OFF -
WITHIN ABOVE OPEN TURN OFF -
WITHIN BELOW OPEN TURN OFF -
WITHIN WITHIN - TURN OFF -