JOHNSON CONTROLS
96
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 5 – SEQUENCE OF OPERATION
Criteria for Operation
The following criteria applies to Pre-Occupancy Purge:
•
The feature will only work when the internal
scheduling feature is being used to determine oc-
cupied and unoccupied periods.
•
The feature will only work on a day that has a oc-
cupied period scheduled.
Sequence of Operation
On Pre-Occupancy Purge the following applies:
•
The programmed
“PRE-OCCUPANCY PURGE
TIME”
is length of the pre-purge prior to the start
of the occupancy period. For example if the
“PRE-
OCCUPANCY PURGE TIME (hours of day)”
is
set for 1, the
“PRE-OCCUPANCY PURGE TIME
(minutes of day)”
is set to 30 and the occupancy
start time is 8:00 AM pre-purge would start at
6:30 AM and operate until 8:00 AM.
•
While in the pre-purge mode the Simplicity Elite
control will turn on the fan and modulate the out-
door air damper to 100% as long as the supply air
temperature is between 45.0° F and 90.0° F.
•
If the supply air temperature drops below 45.0° F
the control will modulate the outdoor air damper
closed until the supply air temperature rises above
50.0° F.
•
If the supply air temperature rises above 90.0° F
the control will modulate the outdoor air damper
closed unit the supply air temperature falls below
85.0° F.
ENERGY RECOVERY VENTILATOR
If the unit has an Energy Recovery Ventilator installed
the exhaust fan needs to operate any time the supply
fan is energized. This feature can be programmed to
only occur in the occupied mode or in both the occu-
pied and unoccupied mode.
The following parameters must be programmed to use
this feature:
•
“ERV ENABLED”
– must be enabled using the
ECONOMIZER/EXHAUST tab of the Simplicity
PC software package.
•
If you want this feature to operate in the unoc-
cupied mode the following parameter must be en-
abled.
•
“ERV UNOCCUPIED FAN ENABLED”
- must
be enabled using the ECONOMIZER/EXHAUST
tab of the Simplicity PC software package.
Sequence of Operation
In the occupied mode, anytime the supply fan is ener-
gized the exhaust fan will also be turned ON.
If
“ERV UNOCCUPIED FAN ENABLED”
is enabled
the exhaust fan will operate in either the occupied or
unoccupied mode when the supply fan is energized.
If the unit has a Exhaust Fan VFD, the output voltage
to the Exhaust Fan VFD will be the same as the voltage
output to the supply fan VFD.
LOW VOLTAGE PROTECTION
The Simplicity Elite control monitors the 24VAC low
voltage level. Before the Simplicity Elite control en-
ergizes a binary output to a contactor, it checks this
voltage level. If the voltage is equal to or less than 19.2
volts the control will not energize the output and will
flash an Alarm Code 35. If the voltage rises above 19.2
volts the control will close the output and resume nor-
mal operation.
If the voltage drops below 16 volts with binary outputs
already energized, the control will open all the binary
outputs to the contactors and flash an Alarm Code 35.
If the voltage rises above 19.2 volts the Simplicity Elite
control will resume normal operation.
OUTDOOR AIR HEATING LOCKOUT
This feature prevents the Simplicity Elite control from
operating in the heating mode when the outdoor tem-
perature is above this setpoint.
The setpoint for this feature is programmed through
“OUTDOOR AIR TEMP HEATING LOCKOUT” us-
ing the HEATING SETUP tab in the Simplicity PC
software package.
HOT GAS BYPASS
Hot gas by pass is used to inject discharge gas into the
expansion valve distributor to artificially place a load
on the evaporator coil under a light load condition.
This is done to raise the suction pressure to keep the
saturation temperature of the refrigerant high enough
to prevent icing of the coil. An auxiliary contact on the
condenser fan, 7M - contactor, energizes the hot gas
bypass valve whenever the contactor is energized. The
hot gas valve monitors the suction pressure and will
modulate to keep the suction pressure above 55 PSIG.
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