User Manual

Siemens Industry, Inc.

Application Note, App 14901

140-1230

2020-02-11

Table of Contents

Overview ................................................................................................................................... 4

BACnet ................................................................................................................................. 4

Hardware Inputs ................................................................................................................... 5

Hardware Outputs................................................................................................................. 5

I/O Mix (Relay Assignment Matrix) ....................................................................................... 6

Connection Diagram ............................................................................................................. 7

Ordering Notes ..................................................................................................................... 8

Sequence of Operation ........................................................................................................... 9

Control Temperature Setpoints ............................................................................................ 9

Effective Room Temperature .............................................................................................. 10

Heating/Cooling Switchover ............................................................................................... 10

Staging Control ................................................................................................................... 11

Compressor Operation ....................................................................................................... 11

Electric Heat (Optional) ...................................................................................................... 12

Gas Furnace (Optional) ...................................................................................................... 13

Operation Diagram - Heat Pump with Electrical Auxiliary Heater ...................................... 14

Reversing Valve Operation ................................................................................................. 14

Ambient Heat Pump Lockouts ............................................................................................ 15

Fan Operation ..................................................................................................................... 17

Wiring Diagram ................................................................................................................... 17

Auxiliary Sequences ........................................................................................................... 19

Humidification ................................................................................................................ 19

Dehumidification ............................................................................................................ 20

Occupancy Notification ....................................................................................................... 21

Economizer Enable ....................................................................................................... 22

Pre-Purge ...................................................................................................................... 22

Semi-Continuous Fan .................................................................................................... 22

Air Quality Management ..................................................................................................... 23

Service and Fault Messages ................................................................................................. 24

Sensor Failure Handling ..................................................................................................... 24

I/O Test Mode ..................................................................................................................... 24

Overcurrent Protection ....................................................................................................... 25

BACnet Scheduler ................................................................................................................. 26

Application 14901 Point Database ....................................................................................... 27

Scheduling Examples ............................................................................................................ 44