PT-Link II N2-3 Interface
PT-Link II N2-3
®
Technical Guide
29
Appendix C - VCM-X N2 Parameters
N2 Properties for the VCM-X Controller
Parameter
Name
Object
Description
Limits
Warm Up
Setpoint
WmupSt
AO: 91
In a VAV
application, upon
entering the
occupied mode, the
Warm-up Demand
will be activated
if the return air
temperature falls
one degree below
this setpoint.
50
90
Wet Bulb
Setpoint
WtblSt
AO: 92
The economizer is
enabled if the
outdoor tem-
perature or wetbulb
falls below this
setpoint.
0
80
Coil
Temperature
Setpoint
CoilTpSt
AO: 107
This is the coil
suction temperature
target during
dehumidifi cation
mode. Produces
dewpoint in the
supply air
approximately 10°F
above this setpoint.
35
70
Relief
Pressure
Setpoint
RfPrSt
AO: 118
This is the target
building pressure
to be maintained
by the VFD Relief
signal.
-0.2
0.2
Indoor
Humidity
Setpoint
InRhSt
AO: 120
If the indoor
humidity rises
above this setpoint,
the unit will
activate the
Dehumidifi cation
Demand.
0
100
Unoccupied
Cooling
Offset
UnClOst
AO: 124
During the
Unoccupied Mode
of Operation, this
Setpoint spreads
the Occupied Cool-
ing Setpoint out by
a user adjustable
amount. If you do
not want Cooling to
operate during the
Unoccupied Mode,
use the default
setting of 30°F for
these setpoints.
0
30
N2 Properties for the VCM-X Controller
Parameter
Name
Object
Description
Limits
Unoccupied
Heating
Offset
UnHtOst
AO: 125
During the
Unoccupied Mode
of Operation, this
Setpoint spreads
the Occupied
Heating Setpoint
out by a user
adjustable amount.
If you do not want
Heating to operate
during the Unoc-
cupied Mode, use
the default setting
of 30°F for these
setpoints.
0
30
CO
2
Setpoint
CO2St
AO: 149
When the CO
2
level rises above
the CO
2
Protection
Limit Max Level,
the Economizer’s
Minimum Position
will begin to reset
open proportionally
between the CO
2
Protection Limit
Max Level Setpoint
and the Reset
Range Setpoint.
0
3000
Minimum
Outside Air
Setpoint
MinEcoSt
AO: 151
This is the
minimum position
of the economizer
in the occupied
modes.
1
100
Static
Pressure
Setpoint
DuctPrSt
AO: 152
This is the target
duct pressure to be
maintained by the
VFD blower signal.
0.01
3
Preheater
Setpoint
PreHtSp
AO: 196
Low Outside Air
Ambient
Protection Setpoint
0
100
Outdoor
Air CFM
Setpoint
OACfmSt
AO: 203
Minimum desired
Outdoor Air CFM.
0.10
K
200 K
Outdoor Air
CFM Reset
Limit
OACfmRs
AO: 204
Maximum desired
Outdoor Air CFM
when CO
2
reaches
its reset limit.
0.10
K
200 K
