Siemens 125-1957 User Manuals

Table of Contents

• Product Overview

  1
• Introduction

  1
• Ordering Notes

  1
• Direct Digital Control

  1
• controller hardware

  1
• Unit Vent Controller

  1
• Hardware Inputs

  2
• hardware, inputs and outputs

  2
• hardware

  2
• Hardware Outputs

  3
• Floor Level Network (FLN)

  3
• Controller LED Indicators

  4
• Temperature Sensors

  4
• LED

  4
• temperature sensor

  4
• room

  4
• temperature sensors

  4
• room

  4
• Room Temperature Sensor

  4
• Actuators

  5
• actuators

  5
• discharge air

  5
• mixed air

  5
• mixed air

  5
• related equipment

  5
• valve actuator

  5
• Applications

  6
• Basic Operation

  6
• Control Temperature Setpoints

  6
• Day/Night Mode

  6
• control temperature setpoints

  6
• day/night mode

  6
• Valve Configuration

  7
• Heating and Cooling Switchover

  7
• Control Loops

  7
• control loops

  7
• heating and cooling switchover

  7
• night mode override switch

  7
• Morning Warm-up/Cool-down

  8
• ON/OFF Coil Valve Control

  8
• Electric Heat

  8
• Fan Operation

  8
• Fail-safe Operation

  8
• fail-safe operation

  8
• fan operation

  8
• Application 2281

  10
• ASHRE Cycles I and II

  10
• auxiliary radiation

  12
• Application 2283 – Heating and/or Chilled Water Cooling, ASHRAE Cycle III

  13
• Application 2283

  13
• ASHRE Cycle III

  13
• Application 2284 – Heating and DX Cooling, ASHRAE Cycles I and II

  16
• Application 2284

  16
• ASHRE Cycle I and II

  16
• auxiliary radiation

  17
• Application 2286 - Heating and DX Cooling, ASHRAE Cycle III

  18
• Application 2286

  18
• ASHRE Cycle III

  18
• Application 2287 – Heating and Cooling, Nesbitt Cycle W

  20
• Overview

  20
• Application 2287

  20
• Nesbitt Cycle W

  20
• Application 2299 – Slave Mode

  22
• Overview

  22
• Application 2299

  22
• Slave mode

  22
• Point Database

  23
• address descriptions

  23
• point database

  23
• point descriptors

  23
• point database

  30
• basic service information

  31
• service information, basic

  31
• static discharge

  31
• troubleshooting

  31
• basic service information

  31
• Basic Sanity Test (BST)

  32
• BST LED

  32
• Light Emitting Diodes (LEDs)

  32
• parts, replacement

  32
• TX LED

  32
• preventive maintenance

  32
• replacement parts

  32
• RX LED

  32
• safety features

  32
• Troubleshooting

  33
• Overview

  33
• Basic Service Information

  33
• algorithm

  33
• centralized control

  33
• control loop

  33
• Ordering Replacement Parts

  34
• Preventive Maintenance

  34
• Safety Features

  34
• Controller LEDs

  34
• English units

  34
• equipment controller

  34
• field panel

  34
• Floor Level Network

  34
• intercept

  34
• LAN

  34
• loopout

  34
• OFF text

  34
• Glossary

  35
• Overview

  35
• SI units

  35
• slave mode

  35
• stand-alone control

  35
• ON text

  35
• override switch

  35
• Terminal Equipment Controller

  35
• unbundle

  36