VCES-DDC-IOM-1C
18
Table B1: DDC Points Reference Guide
Item # Description Limits
Factory
Set
BACnet
Variable
Function
145 Stp Burner minimum output 0–50% 0% AV152
Used to set the minimum modulated output to the burner to avoid cycling. If Tega burner
is used, it must be set to 12%.
146 Stp Site elevation 0–100 (x100) ft 10 (x100) ft AV153 Used for enthalpy calculations.
147 Stp Summer zone setpoint
60°F–80°F
[15°C–25°C]
70°F AV84 The summer zone setpoint is the room or return air setpoint for summer mode.
148 Stp Summer zone span
1°F–8°F
[0.5°C–5°C]
2°F AV85 The summer zone span is the differential above and below summer zone setpoint.
149 Stp Summer zone reset 0–100% 50% AV86 The summer zone reset is the shift in the span below the summer zone setpoint by X%.
150 Stp Winter zone setpoint
60°F–80°F
[15°C–25°C]
70°F AV87 The winter zone setpoint is the room or return air setpoint for winter mode.
151 Stp Winter zone span
1°F–8°F
[0.5°C–5°C]
2°F AV88 The winter zone span is the differential above and below winter zone setpoint.
152 Stp Winter zone reset 0–100% 50% AV89 The winter zone reset is the shift in the span below the winter zone setpoint by X%.
153 Stp Zone configuration NO – RET – RM NO MV11
The zone configuration allows the unit to be used for zone cooling/heating.
NO = No zone control
RET = Return air zone control (return air temperature sensor)
RM = Room air zone control (Bacstat II temperature sensor**)
154 Stp
Minimum supply tem-
perature
Min. 40°F [5°C] 50°F AV26
Used with RET or RM zone configuration. Protects the room from too low of a supply air
temperature.
155 Stp
Maximum supply tem-
perature
Max. 120°F
[49°C]
100°F AV27
Used with RET or RM zone configuration. Protects the room from too high of a supply air
temperature.
156 Stp Factory set, do not change
157 Stp Factory set, do not change
158 Stp Factory set, do not change
159 Stp Factory set, do not change
160 Stp Factory set, do not change
161 Stp Factory set, do not change
162 Stp Factory set, do not change
163 Stp Factory set, do not change
164 Stp Compressor delay 10–300 seconds 90 seconds AV19 Delays compressor to allow the water valve(s) to open.
165 Stp Economizer select On/off Off BV141 Enables or disables WSHP Economizer coil.
166 Stp Economizer setpoint
40°F–105°F
[−20°C–10°C]
65°F AV180 Economizer entering water temperature setpoint.
167 Stp
Unoccupied recirc supply
fan option
On/off Off BV145
If Off and in Ur mode, supply fan only turns on with contact override. If On, then supply
fan turns on when in Ur mode.
168 Stp
Water leaving tempera-
ture setpoint
−4°F–50°F
[−20°C–10°C]
35°F AV185 Setpoint that will trip unit on low water freeze protection (optional).
169 Stp Factory set, do not change
170 Stp Factory set, do not change
199 Stp Conversion F to C °F–°C °F BV99 This setting is used to change from Standard to SI units.
N/A N/A Remote unit control N/A MV12
The remote unit control multi-state variable is used to enable the unit through a Bacnet
inter. Set MV12 to (based on starting at a count of one):
– 2 for unoccupied mode – 4 for occupied recirculation mode (optional)
– 10 for ventilation mode – 6 for unoccupied recirculation mode (optional)
Note: This variable can only be modified through a BMS
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