157
JOHNSON CONTROLS
5276178-JIM-C-0118
5
level “C02 LVL INSIDE BAS” must be changed from
USER DISABLED to USER ENABLE. “C02 LVL
INSIDE BAS” can be found under the SERVICE key.
Fixed Minimum
Required Program Values
“VENTILATION CONTROL”
must be set to
“FIXED
MINIMUM”
. This is set through the OPTIONS key,
VENTILATION subsection of the User Interface.
“DAMPER HARDWARE”
must be set to
“STANDARD”.
This is set through the OPTIONS key, VENTILATION
subsection of the User Interface.
“VENTILATION SYSTEM”
must be set to USER
ENABLED. This is set through the PROGRAM key,
VENTILATION subsection of the User Interface.
On units configured as
“STANDARD DAMPERS”
the
“OA DAMPER MINIMUM POSITION”
and
“OA
DAMPER MAXIMUM POSITION”
must be set through
the SETPOINTS key, VENTILATION subsection of
the User Interface.
Sequence of Operation
On units configured for
“STANDARD DAMPERS”
and the Unit Type is set to CONSTANT VOLUME the
damper minimum position is the programmed
“OA
DAMPER MINIMUM POSITION”
.
On units configured for
“STANDARD DAMPERS”
and the Unit Type is set to Variable AIR VOLUME or
FLEXSYS the minimum position will vary between
the
“OA DAMPER MINIMUM POSITION”
and
“OA
DAMPER MAXIMUM POSITION”
based on the speed
of the VFD Supply Fan. As the fan speed decreases the
damper position will increase.
The following formula is used to calculate the damper
position:
MP =
MP
1
- MP
2
50
VFD + 2 (MP
2
- MP
1
) = MP
1
[
]
Where:
•
MP = Active Minimum Air Flow.
•
MP
1
=
“OA DAMPER MINIMUM POSITION”.
•
MP
2
=
“OA DAMPER MAXIMUM POSITION”.
•
VFD = Output to supply Fan VFD.
Air Measuring Stations
This feature is not available on this product.
SMOKE PURGE
The following parameters must be programmed into
the Unit Controller:
•
“SMOKE PURGE SEQ 1”
can be set to
“PURGE”
,
“PRESSURIZATION”
, or
“EVACU-
ATION”
through the OPTIONS key, UNIT DATA
subsection of the User Interface.
Whenever a Smoke Purge sequence is started, all normal
heating and cooling functions are stopped, regardless of
control inputs. This will occur within 2 seconds after
the Smoke Purge signal is received.
On VAV units duct static pressure control is maintained
during smoke purge operation.
“SMOKE PURGE SEQ 1”is
initiated through a digital
input to the Unit Controller. The input for
“SMOKE
PURGE SEQ 1”
is at the CTB3 Terminal Block 19
(SMK). To place the unit in
“SMOKE PURGE SEQ
1”
close a circuit between 24VAC (R) terminals 2 or
16 and terminal 19 (SMK).
“PURGE” –
purge shall be used to displace the air
inside the space with fresh outside air. When this
sequence is started the following will occur:
•
Start the Supply Fan, if not already ON.
•
Start the Return Fan, if not already ON.
•
Start the Exhaust Fan, if not already ON.
•
Set all Outside Air Damper Output(s) to 100%.
•
Set the Return Air Damper to 0%.
•
Set the Exhaust Damper Output to 100%.
“PRESSURIZATION” –
purge shall be used to
pressurize the building or space in order to force the air
inside the space through the walls to adjacent spaces or
outside the building envelope. When this sequence is
started the following will occur:
•
Start the Supply Fan, if not already ON.
•
Start the Return Fan, if not already ON.
•
Stop the Exhaust Fan if ON.
•
Set all Outside Air Damper Output(s) to 100%.
•
Set the Return Air Damper to 0%.
“EVACUATION” –
purge shall be used to evacuate
(negatively pressurize) the building or space in order
to draw air through the walls from adjacent spaces or
outside the building envelope. When this sequence is
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