142
JOHNSON CONTROLS
5276178-JIM-C-0118
Sequence of Operation
PLY AIR TEMP”
must be less than or equal
to the
“MX SUPPLY AIR TEMP SETPOINT”
MINUS 2.5°F for 5 minutes.
- For FlexSys with Bypass the
“RETURN AIR
BYPASS CURRENT”
must be more than or
equal to the
“MAXIMUM BYPASS”
minus
5%.
•
Economizer Output must be less than or equal to
5%.
•
Compressor operation must have been OFF for
10 minutes.
On modulating hot water and steam, the following
criteria must be met to terminate the Supply Air
Tempering:
•
Operating Conditions
- For VAV units the
“SUPPLY AIR TEMP”
must be more than or equal to the
“SUPPLY
AIR TEMP ACTIVE SP”
for 5 minutes.
- For FlexSys with or without Bypass the
“SUPPLY AIR TEMP”
must be more than or
equal to the
“MX SUPPLY AIR TEMP”
for 5
minutes.
•
The
“HEATING VALVE”
must be less than or
equal to 2%.
Staged Gas or Electric Heat
In order for the Supply Air Tempering to be enabled,
the following conditions must be met:
•
Operating Conditions
- For VAV units the
“SUPPLY AIR TEMP”
must be less than or equal to the
“SUPPLY
AIR TEMP ACTIVE SP”
minus 2.5°F for 5
minutes.
- For FlexSys without Bypass the
“MX AIR
TEMP”
must be less than or equal to the
“MX
SUPPLY AIR TEMP SETPOINT”
MINUS
2.5°F for 5 minutes.
- For FlexSys with Bypass the
“RETURN AIR
BYPASS CURRENT”
must be more than or
equal to the
“MAXIMUM BYPASS”
minus
5%.
•
Economizer Output must be less than or equal to
5%.
•
Compressor operation must have been OFF for
10 minutes.
•
The
“HEAT ENTERING TEMP”
must be less
than or equal to the
“SUPPLY AIR TEMP AC-
TIVE SP”
minus 5.0°F for 5 minutes.
The stage heat will stage up and down based on the
following criteria:
•
The heat section will stage up if the
“SUPPLY
AIR TEMP”
is less than or equal to the
“SUPPLY
AIR TEMP ACTIVE SP”
minus 5.0°F.
•
The heat section will stage down if the
“SUP-
PLY AIR TEMP”
is more than or equal to the
“SUPPLY AIR TEMP ACTIVE SP”
plus 2 x the
“HEATING CONTROL OFFSET”
minus 5.0°F.
(If 2 x the
“HEATING CONTROL OFFSET”
minus 5.0°F is less than 5.0°F the value will be
set to 5.0°F).
The
“HEAT ENTERING TEMP”
must be more than
or equal to the
“SUPPLY AIR TEMP ACTIVE SP”
for 5 minutes in order to terminate the Supply Air
Tempering.
COMFORT VENTILATION
In order for this mode of operation to function the
following parameters must be programmed into the Unit
Controller through the User Interface:
•
“UNIT TYPE”
must be set to
“CONSTANT VOL-
UME”
using the OPTIONS key, UNIT DATA
subsection of the User Interface.
•
“COMFORT VENTILATION”
must be USER
ENABLED using the PROGRAM key, VENTI-
LATION subsection of the User Interface.
•
“OCC ZONE COOLING SETPOINT”
must be
set using the SETPOINTS key, COOLING sub-
section of the User Interface.
•
“OCC ZONE HEATING SETPOINT”
must be set
using the SETPOINTS key, HEATING subsec-
tion of the User Interface.
When
“COMFORT VENTILATION”
is selected, the
Unit Controller monitors the
“SUPPLY AIR TEMP”
and uses it to energize mechanical cooling or heating
even though the thermostat or zone sensor satisfies the
normal heating or cooling demand. This prevents the
space temperature from getting out of bounds before
mechanical heating or cooling is energized. This is
usually used when there is a large demand for outdoor
air for ventilation.
If the
“SUPPLY AIR TEMP”
is equal to or greater than
Содержание 40 25 TON
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