Application

Sequence of Operation
Room Unit Operation
30
Siemens Industry, Inc.
BACnet LCM-OAVS, Application 6760
140-1326
2015-07-07
Room Temperature, Setpoint, RH and CO2
 When the digital room unit (Series 2200/2300) is used, SENSOR SEL selects the
source for temperature and setpoint and enables a loss of communications
indication:
– 1 = enables supervision (from the room unit) for fail communications for
temperature and setpoint.
– 2 = enables supervision (from the room unit) for fail communications for relative
humidity.
– 4 = enables supervision (from the room unit) for fail communications for CO2.
 When the analog room unit (Series 1000/2000) is used, SENSOR SEL values for
temperature/setpoint, relative humidity and CO2 should be left at their default
values (0).
Thermistor Inputs
 Default for input is 10K.
 To enable 100K Ω thermistor on input, see the following table for additive values.
SENSOR SEL
Value *
Description
0
Analog Room Unit, 10K
1
Select Digital Room Unit (for temperature sensing and setpoint dial), 10K
2
Relative Humidity (RH) sensing, 10K
3
Digital Room Unit, RH, 10K
4
CO
2
sensing, 10K
5
Digital Room Unit, CO2, 10K
7
Digital Room Unit, RH, CO2, 10K
8
Analog Room Unit, 100K
9
Digital Room Unit, 100K
11
Digital Room Unit, RH, 100K
13
Digital Room Unit, CO2, 100K
15
Digital Room Unit, RH, CO2, 100k
16
(Not used)
Example 1: Digital Room Unit with temperature, RH, CO2 and 10K thermistor.
1+2+4+0 = 7
Example 2: Analog Room unit with 100K thermistor. 0+0+0+8 = 8
Room CO2
RM CO2 displays the CO
2
value in units of parts-per-million (PPM). RM CO2 (from the
digital 2200/2300 room units) can be used with PPCL in the PTEC/ATEC controller or
unbundled for control or monitoring purposes.