Rheem sequences of operation

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

Furnace (11)

Startup

• Initial startup and lighting (communicating furnace)
  96V, 96MDV

Ignition

• Gas heat call, direct spark ignition and retry
  UT control, direct spark (90RJ variant)
• Gas heat call, hot surface ignition and retry
  UT control, Invesys, hot surface ignition
• Gas heat call, ignition and retry (direct spark)
  UT control, direct spark (two-stage inducer)
• Heating ignition and blower sequence
  96V
• Retry sequence when burners do not light or flame is not sensed
  96V, 96MDV
• Two-stage gas heat call, ignition on high fire and retry
  R96V, 96V two-stage, Honeywell control
• Two-stage heat call, high-fire light-off and staging
  RGRM Nature Air two-stage

Heating

• Heating call sequence of operation (Honeywell integrated control, direct spark ignition)
  96V, 96MDV
• Two-stage heating cycle and staging
  RGPE two-stage (IFC with spark)

Standby/shutdown

• Shutdown procedure
  96V, 96MDV

Heat pump (2)

Startup

• Compressor start protection and status display
  PRL-JEC, ICC control

Defrost

• Demand defrost cycle
  PRL-JEC, ICC control

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.