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VCES-DDC-IOM-1C

Table B1: DDC Points Reference Guide

Item # Description Limits

Factory

Set

BACnet

Variable

Function

1 Ot1 Outside air temperature N/A N/A AI3 Temperature reading.

2 St1 Supply air temperature N/A N/A AI4 Temperature reading.

3 Rt1 Return air temperature N/A N/A AI5 Temperature reading.

4 Et1 Exhaust air temperature N/A N/A AI6 Temperature reading.

5 OH1

Outside air humidity

(optional)

N/A N/A AI7 Humidity reading.

6 RH1

Return air humidity

(optional)

N/A N/A AI8 Humidity reading.

7 On/off Supply blower operation On/off N/A BO1 Supply blower operation.

8 BAC BacStat room temperature N/A N/A AI101 Temperature reding.

9 Prg Program ID N/A N/A AV1000 Program ID.

10 Dpr Damper end switch N/A N/A M17

UC (1) – unconnected.

NO (2) – No damper end switch made.

ED (6) – Exhaust damper end switch made.

OD (10) – Outside damper end switch made.

OD/ED (14) – Outside and exhaust damper end switch made.

101 Stp High limit setpoint

100°F–160°F

[38°C–71°C]

160°F AV2 Unit shuts down when supply temperature rises above this setpoint.

102 Stp Low limit setpoint

35°F–50°F

[2°C–10°C]

35°F AV3

Unit shuts down when supply temperature drops below this setpoint for the low limit

delay.

103 Stp Low limit delay 0–15 minutes 5 minutes AV4

Used in conjunction with the low limit setpoint. A time delay before the unit will shut

down if the supply air drops below the low limit setpoint.

104 Stp Summer setpoint

5°F–80°F

[−15°C–27°C]

60°F AV5

The summer setpoint is the temperature for the unit to change over between summer

and winter modes of operation.

105 Stp Summer span

1°F–8°F

[0.5°C–5°C]

4°F AV6 The summer span is the differential above and below the summer setpoint.

106 Stp Summer reset 0–100% 50% AV7 The summer reset is the shift in the span below the summer setpoint by X%.

107 Stp Cooling setpoint

50°F–80°C

[10°C–27°C]

60°F AV10

The cooling setpoint is the temperature that the reheat will heat the supply air up to

(summer mode only).

108 Stp Cooling span

4°F–12°F

[2°C–7°C]

4°F AV11 The cooling span is the differential above and below the cooling setpoint.

109 Stp Cooling reset 0–75% 50% AV12 The cooling reset is the shift in the span below the cooling setpoint by X%.

110 Stp Cool off minimum 5–30 minutes 10 minutes AV13

After a low pressure condition persists and shuts the compressor down, this is the

amount of timebefore the DDC will try to restart the compressor.

111 Stp Heating setpoint

50°F–105°F

[10°C–40°C]

80°F AV20

The heating setpoint is the temperature that the post heat will heat the supply air up to

during discharge air temperature control (winter mode only).

112 Stp Heating span

4°F–20°F

[2°C–12°C]

4°F AV21 The heating span is the differential above and below the heating setpoint.

113 Stp Heating reset 0–75% 50% AV22 The heating reset is the shift in the span below the heating setpoint by X%.

114 Stp Heat off minimum 1–30 minutes 4 minutes AV23

After the heater has turned off, this is the minimum time that the DDC will wait before

turning it back on.

115 Stp Coil leaving setpoint

40–80°F

[4–27°C]

55°F AV143

The coil leaving setpoint is the temperature that the cooling coil will cool the coil leaving

air temperature down to during discharge air temperature control (summer mode only).

116 Stp Coil leaving span

4°F–12°F

[2°C–7°C]

4°F AV144 The coil leaving span is the differential above and below the coil leaving setpoint.

117 Stp Coil leaving reset 0–75% 50% AV145 The coil leaving reset is the shift in the span below the coil leaving setpoint by X%.

Appendix B: DDC Points Reference Guide

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