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Table B1: DDC Points Reference Guide
Item # Description Limits
Factory
Set
BACnet
Variable
Function
118 Stp
Coil override leaving
setpoint
40°F–65°F
[4°C–18°C]
50°F AV146
The coil override leaving setpoint is the temperature that the cooling coil will cool the coil
leaving airtemperature down to during room air temperature/humidity control (summer
mode only).
119 Stp Coil override leaving span 4–12°F [2–7°C] 4°F AV147
The coil override leaving span is the differentials above and below the coil override leav-
ing setpoint.
120 Stp Coil override leaving reset 0–75% 50% AV148
The coil override leaving reset is the shift in the span below the coil override leaving
setpoint by X%.
121 Stp Heating override setpoint
50°F–105°F
[10°C–40°C]
90°F AV140
The heating override setpoint is the temperature that the post heat will heat the supply
air up to during room air temperature control (winter mode only).
122 Stp Heating override span
4°F–20°F
[2°C–12°C]
4°F AV141 The heating override span is the differential above and below the heating override setpoint.
123 Stp Heating override reset 0–75% 50% AV142 The heating override reset is the shift in the span below the heating override setpoint by X%.
124 Stp
Enthalpy free cooling
setpoint
10–70 Btu/lbs
[23–163 Joules/
gram]
20 Btu/lbs AV45
The enthalpy free cooling setpoint is the measured enthalpy that the unit will go into free
cooling. Site elevation (AV153) may need to be updated
125 Stp
Enthalpy free cooling
span
5–20 Btu/lbs 5 Btu/lbs AV46 The enthalpy free cooling span is the differential above and below the enthalpy setpoint.
126 Stp
Enthalpy free cooling
reset
0–100% 50% AV47
The enthalpy free cooling reset is the shift in the span below the enthalpy free cooling
setpoint by X%.
127 Stp
Dy bulb free cooling
setpoint
40°F–80°F
[5°C–27°C]
65°F AV60
The dry bulb free cooling setpoint is the temperature that the unit will go into free cool-
ing. Used with VSD free cooling option
128 Stp
Dry bulb free cooling
span
4°F–20°F
[2°C–12°C]
4°F AV61
The dry bulb free cooling span is the differential above and below the free cooling set-
point. Used with VSD free cooling option.
129 Stp
Dry bulb free cooling
reset
0–100% 50% AV62
The enthalpy free cooling reset is the shift in the span below the dry bulb free cooling
setpoint by X%. Used with VSD free cooling option.
130 Stp Free cooling select On/off On BV61 This variable enables or disables free cooling.
131 Stp Defrost setpoint
−5°F–50°F
[−20°C–10°C]
5°F AV65
The defrost setpoint is the temperature where the unit will go into defrost mode.
(Defaults to 33°F for VFD defrost).
132 Stp Defrost span
2°F–10°F
[1°C–5°C]
2°F AV66 The defrost span is the differential above and below the defrost setpoint.
133 Stp Defrost reset 0–100% 50% AV67 The defrost reset is the shift in the span below the defrost setpoint by X%.
134 Stp Electric reheat switch On/off Off BV35
This variable enables or disables electric reheat. Enable this point only if you do not have
HRG and you wish to use your electric post heat.
135 Stp Factory set, do not change
136 Stp Factory set, do not change
137 Stp Factory set, do not change
138 Stp Factory set, do not change
139 Stp Factory set, do not change
140 Stp Factory set, do not change
141 Stp Factory set, do not change
142 Stp Factory set, do not change
143 Stp
Outside air damper
minimum
0–100% 100% AV150
The outside air damper minimum setpoint is set in conjunction with the exhaust air set-
point damper minimum setpoint to allow for the required recirculation air.
144 Stp
Exhaust air damper
minimum
0–100% 100% AV151
The exhaust air damper minimum setpoint is set in conjunction with the outside air set-
point damper minimum setpoint to allow for the required recirculation air.
- DDC Controls Package Manual 1
- Table of Contents 2
- Overview 3
- Features and Benefits 3
- Terminal Strip 3
- Control Details 4
- Stand Alone Operation 4
- Network Operation 4
- (MV11 = NO) 5
- (MV11 = RET) 5
- Setpoint Adjustment 6
- VHC Sequence of Operation 7
- IMPORTANT – COMPRESSOR SAFETY 9
- VCES-DDC-IOM-1C 10
- DDC Interface 11
- Item number 12
- Description 12
- Setpoint 12
- Power out 14
- Power/Net 1 15
- BacNet terminals 19
- DNT294 Rev 1.1 20
- Delta © 04/00 20
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