Bosch sequences of operation

14 sequences for Bosch equipment: what the unit does, step by step, with the timings. Pick the equipment type, then the mode.

Air handler (2)

Heating

• Blower control: anti-cold-air delay and heating fan delay
  IDS Premium, Plus-Premium

Cooling

• Dehumidification call
  IDS Premium, Plus-Premium

Boiler (6)

Startup

• First power-up purge and trap filling
  Greenstar 3A

Heating

• Heating call, anti-cycle and pump post purge
  Greenstar 3A

Domestic hot water

• Combi comfort and economy modes
  Greenstar 3A
• Tank priority (ZBR with DHW tank)
  Greenstar 3A

Freeze protection

• Frost protection setup
  Greenstar 3A

Other

• Thermal disinfection of DHW tank
  Greenstar 3A

Heat pump (5)

Startup

• Crankcase heater and reversing valve behaviour
  IDS Light, Premium Connected

Defrost

• Demand defrost
  IDS Light, Premium Connected, 2.0
• Manual (forced) defrost test
  IDS Light, Premium Connected, 2.0

Other

• Oil return and force (charge) mode
  IDS 2.0
• Operating limits and compressor protections
  IDS Light, Premium Connected

Tankless water heater (1)

Domestic hot water

• Flow-activated hot water call
  Greentherm T9800/T9900

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.