Johnson Controls 100 Series Manual

JOHNSON CONTROLS
23
FORM 100.50-SU8
ISSUE DATE:1/28/2016
8
SAT HIGH SETPOINT
(Default = 65.0 °F)
Active SAT
Setpoint
SAT LOW SETPOINT
(Default = 55.0 °F)
0 Volts 5 VoltsSupply Air Temp Reset Voltage
(Volts DC)
A 2.5 VDC hardwired signal or
a 2.5 communicated signal will
reset SAT SP to 60 °F.
Supply Air Temperature Setpoint Reset is a function
that allows the Active Supply Air Temperature SP to
be reset to differing values according to certain param-
eters and programmed algorithms. Programmed SAT
reset will only work on Series 100 units set up for VAV
operation and is only utilized in the Occupied Cooling
mode. SAT reset for other set ups—Constant Volume,
Flexsys, and SZVAV—as well as other modes—Occ
Heating, Unocc Cooling, and Unocc Heating—will re-
quire the BAS to write to those specific points.
There are four different ways to reset the SAT SP for a
Series 100 unit.
1. Hardwired Signal: Either from a BAS or a hard-
wired input to CTB1
2. Return Air Temperature
3. Outside Air Temperature
4. Supply Fan VFD Speed
For reset by return air, outside air, or supply fan VFD
speed, SPs are programmed into the unit controller or
communicated from a BAS, and the active SAT SP will
be determined by the programmed values.
A Hardwired Reset signal is the one most commonly
used with a BAS. Before this can work, the “SAT RST
BAS” must be enabled thru the Service key at the Unit
Controller. Once this is done, the SAT High SP and
SAT Low SP can be set.
• SAT High SP: SAT_HIGH_LIM (AV26)
• SAT low SP: SAT_LOW_LIM (AV27)
Once these two values are entered, the BAS can send a
command of 0–5 to the following point:
• Supply Air Temp Reset BAS: SAT_RST_BST
(AV28)
SEQUENCE OF OPERATION
BAS Command of “0”: The unit controller will set the
Active Supply Air Temp SP, ACT_SAT_SP (AI04), to
the value programmed at SAT_HIGH_LIM (AV26)
BAS Command of “5”: The unit controller will set the
Active Supply Air Temp SP, ACT_SAT_SP (AI04), to
the value programmed at SAT_LOW_LIM (AV27)
BAS Command between “0–5”: The unit controller
will set the Active Supply Air Temp SP, ACT_SAT_SP
(AI04), to a value somewhere between the SAT High
(AV26) and SAT Low (AV27), according to the below
chart.
SECTION 8 - SUPPLY AIR TEMPERATURE (SAT) SP RESET

Johnson Controls 100 Series Specifications

General

Brand	Johnson Controls
Model	100 Series
Category	Air Conditioner
Language	English