101
YORK INTERNATIONAL
FORM 100.50-NOM1 (604)
7
Economizer 2
nd
Stage
This tells the control what Supply Air Temperature to
maintain for a call for second stage of cooling. This is
used only during Constant Volume cooling mode with
Economizer operation.
SAT Econo Load Heat
The SAT Economizer Loading for Heating Setpoint is
used as the setpoint for the Supply Air Temperature
when the unit is using the economizer dampers to
main tain the
SAT Econo Load Heat
setpoint when one
heat ing stage is ON.
Outside Air Enthalpy
This tells the control an outside air enthalpy limit.
Be low this limit, outside air is available for cooling.
A one BTU/LB hysteresis on each side of the limit is
to be used.
Comfort Vent High SAT
This is the SAT High Limit Setpoint for the Comfort
Ventilation mode (only used with Constant Volume
units).
Comfort Vent Low SAT
This is the SAT Low Limit Setpoint for the Comfort
Ventilation mode (only used with Constant Volume
units).
Warm-Up RAT
This is the Morning Warm Up Return Air Temperature
Setpoint.
Hydro Heat 1
st
Stage
CV Hydronic Heating:
When the Hydronic Heat or Modulating Gas Heat
option is enabled, the con trol will maintain this
SAT setpoint during a call for
Þ
rst stage Heating,
by modulating the Hot Water Valve or Gas Heat
Section.
VAV Heating:
This setpoint will also be the reset temperature when
operating a VAV unit in the Heating mode.
Hydro Heat 2
nd
Stage
When the Hydronic Heat or Modulating Gas Heat option
is enabled, the control will maintain this SAT setpoint
during a call for second stage Heating, by modulating
the Hot Water Valve or Gas Heat Section.
OA Damper Min Pos #1
This tells the control what the minimum Outdoor Air
Damper (Economizer) position is during the occupied
mode and when the Supply Fan is at full
ß
ow. This value
will be used for CV units and VAV units.
On VAV units, this value will be used for the minimum
damper position when the VFD output from the control
is 100% (10VDC).
Reason: full airfl ow with a VAV unit
will be equivalent as a CV unit which runs at its design
(maximum) fan speed.
FIG. 47 –
ODA DAMPER POSITION VS. VAV
SUPPLY FAN OUTPUT
#2: 30%
#1: 15%
50%
100%
VFD OUTPUT
ODA DAMPER
POSITION
(Default
Values)
ODA DAMPER POSITION VS.
VAV SUPPLY FAN OUTPUT
LD06585
OA Damper Min Pos #2
This tells the control what the minimum Outdoor Air
Damper position is during both the occupied mode and
when the Supply Fan is not at full
ß
ow. This value will
be used for VAV units only and will be ignored on CV
units.
Reason: when using a VAV and operating at less
then full fl ow, the OA damp ers need to open further to
supply the re quired min i mum airfl ow.
This value will indicate what the minimum position of
the OAD should be when the VFD output is at 50%. This
value will be used with the OAD Minimum Po si tion
#1 value to linearly reset the position of the OAD with
respect to the output to the VFD. See Fig. 47.
Demand Ventilation
This setpoint is the maximum IAQ (CO2) level that the
control will allow.
