Carrier sequences of operation

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

Furnace (4)

Ignition

• Single-stage 80% furnace: ignition sequence and retries
  58SB0A, 58SB1A

Heating

• Single-stage 80% furnace: heating cycle, blower delays and shutdown
  58SB0A, 58SB1A

Cooling

• Furnace blower with outdoor A/C: cooling and continuous fan
  58SB0A, 58SB1A

Other

• Furnace used with a heat pump (dual fuel timing)
  58SB0A, 58SB1A

Heat pump (10)

Startup

• Single-stage communicating heat pump: time delays and operating functions
  Infinity, single-stage communicating
• Variable-speed unit: power-up and compressor time delays
  Infinity 25VNA8, 24VNA9

Heating

• Non-communicating heat pump: heating cycle (HK32EA001/007 and 003/008)
  Performance

Cooling

• Non-communicating heat pump: cooling with 5-minute compressor delay (HK32EA003/008)
  Performance

Defrost

• Non-communicating heat pump: time/temperature defrost and Quiet Shift
  Performance
• Single-stage communicating heat pump: demand defrost, Auto interval and Quiet Shift-2
  Infinity, single-stage communicating
• Variable-speed heat pump: demand defrost with Auto interval
  Infinity 25VNA8, 24VNA9

Other

• Single-stage communicating heat pump: pressure switch protection and lockout
  Infinity, single-stage communicating
• Variable-speed unit: high pressure switch protection and lockout
  Infinity 25VNA8, 24VNA9
• Variable-speed unit: low pressure protection and lockout
  Infinity 25VNA8, 24VNA9

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.