S Series AO90TPAMF — DIP Switch Settings

Service manual extract focused on DIP switch settings only (no tables). Use the exact DIP switch numbers as printed on the printed circuit board.

Site practice note:

  • Where the manual states “setting forbidden” or “factory setting”, do not alter the DIP switch positions in the field.
  • For modes that require a timed ON state (for example pump down / forced defrost), follow the minimum “ON time” stated below, then return the switch to OFF when complete.

OUTDOOR UNIT OPERATION CONTROL

TEST RUN (Outdoor unit DIP switch SW1)
This section uses the outdoor unit printed circuit board DIP switch SW1.

SW1-1 and SW1-2 — Test run selector (Cooling / Heating)

  • SW1-1 OFF + SW1-2 OFF: Normal operation
  • SW1-1 OFF + SW1-2 ON: Cooling test run (switch ON state maintained continuously for more than 1 minute)
  • SW1-1 ON + SW1-2 OFF: Heating test run (same timing requirement as cooling test run)
  • SW1-1 ON + SW1-2 ON: Normal operation

SW1-3 — Pump down operation

  • SW1-3 OFF: Release
  • SW1-3 ON: Operate (toggle OFF→ON and keep ON continuously for more than 30 seconds)

SW1-4 — Forced defrost operation

  • SW1-4 OFF: Release
  • SW1-4 ON: Operate (toggle OFF→ON and keep ON continuously for more than 30 seconds)
FUNCTION AND SETTING OF EACH SWITCH (Outdoor unit DIP switch SW2)
This section uses the outdoor unit printed circuit board DIP switch SW2.

SW2-1 — Night operation fan mode (low-noise night mode)

  • SW2-1 OFF: Release
  • SW2-1 ON: Operate

SW2-2 — Snow falling protection fan mode

  • SW2-2 OFF: Release
  • SW2-2 ON: Operate (outdoor fan periodically runs to reduce snow coverage risk, even if the compressor is stopped)

SW2-3 — Expansion valve initialization (Electronic expansion valve pulse reset)

  • SW2-3 OFF: Release
  • SW2-3 ON: Operate (initializes the number of pulses when the outdoor unit is stopped)

SW2-4 — Forced oil recovery operation

  • SW2-4 OFF: Release
  • SW2-4 ON: Operate (manual start of oil recovery)
FUNCTION AND SETTING OF EACH SWITCH (Outdoor unit DIP switch SW5 / SW3 / SW4)
This section uses the outdoor unit printed circuit board DIP switches SW5, SW3, and SW4.

SW5-3 — Base heater validity / invalidity

  • SW5-3 OFF: Base heater invalid
  • SW5-3 ON: Base heater valid (output at CN5)

Operational note: the base heater output turns ON at an outside temperature of 2 °C or less and during heating operation (field-available base heater is 220–240V AC, 35W).

SW5-1, SW5-2, SW5-4 — Setting forbidden

Do not change: DIP switch SW5-1, SW5-2, and SW5-4 are specified as forbidden.

SW3 and SW4 — Setting forbidden

Do not change: DIP switch SW3-1, SW3-2, SW3-3, SW3-4 and DIP switch SW4-1, SW4-2, SW4-3, SW4-4 are specified as forbidden.

INDOOR UNIT OPERATION

FUNCTION AND SETTING OF EACH SWITCH (Indoor unit DIP switch SW1)
This section uses the indoor unit printed circuit board DIP switch SW1.

SW1-1 and SW1-2 — Ceiling height setting (cassette type only)

The manual specifies that this function is valid only for cassette type indoor units.

  • Standard (2.5–3.0 m): SW1-1 OFF + SW1-2 OFF
  • High ceiling 1 (3.0–3.5 m): SW1-1 ON + SW1-2 OFF
  • High ceiling 2 (more than 3.5 m): SW1-1 OFF + SW1-2 ON
  • Low ceiling (less than 2.5 m): SW1-1 ON + SW1-2 ON

SW1-3 and SW1-4 — Room temperature correction coefficient (heating)

Select the heating temperature correction coefficient value as printed in the manual.

  • 0 deg: SW1-3 OFF + SW1-4 ON
  • +4 deg: SW1-3 OFF + SW1-4 OFF
  • +8 deg: SW1-3 ON + SW1-4 OFF
  • +12 deg: SW1-3 ON + SW1-4 ON
FUNCTION AND SETTING OF EACH SWITCH (Indoor unit DIP switch SW2)
This section uses the indoor unit printed circuit board DIP switch SW2.

SW2-1 — Room temperature correction coefficient (cooling)

  • 0 deg: SW2-1 OFF
  • +2 deg: SW2-1 ON

SW2-2 — Zone control switch

  • Zone control valid: SW2-2 ON
  • Zone control invalid: SW2-2 OFF

SW2-3 — Filter check validity / invalidity (filter cleaning function)

  • Filter check valid: SW2-3 ON
  • Filter check invalid: SW2-3 OFF

SW2-4 — Auto restart validity / invalidity

  • Auto restart valid: SW2-4 ON
  • Auto restart invalid: SW2-4 OFF
FUNCTION AND SETTING OF EACH SWITCH (Indoor unit DIP switch SW3 and SW4)
This section uses the indoor unit printed circuit board DIP switches SW3 and SW4.

SW3-1, SW3-2, SW3-3 — Indoor unit fan speed switch

The fan speed selection has multiple “rotation tables” and is selected based on indoor unit model. Treat this as a factory-set item unless you are explicitly performing a model-code printed circuit board configuration procedure.

SW3-4 — Setting forbidden

Do not change: DIP switch SW3-4 is specified as forbidden.

SW4-1, SW4-2, SW4-3 (SW4-4 fixed OFF) — Indoor unit model code (capacity)

SW4 is used to change the indoor unit model code information on the indoor unit printed circuit board. The manual shows SW4-4 as OFF.

Model code (capacity) mappings

  • Model code 60: SW4-1 ON, SW4-2 OFF, SW4-3 ON, SW4-4 OFF
  • Model code 54: SW4-1 OFF, SW4-2 OFF, SW4-3 ON, SW4-4 OFF
  • Model code 45: SW4-1 ON, SW4-2 OFF, SW4-3 OFF, SW4-4 OFF
  • Model code 36: SW4-1 OFF, SW4-2 OFF, SW4-3 OFF, SW4-4 OFF
  • Model code 30: SW4-1 ON, SW4-2 ON, SW4-3 ON, SW4-4 OFF
  • Model code 25: SW4-1 OFF, SW4-2 ON, SW4-3 ON, SW4-4 OFF
  • Model code 20: SW4-1 ON, SW4-2 ON, SW4-3 OFF, SW4-4 OFF
  • Model code 18: SW4-1 OFF, SW4-2 ON, SW4-3 OFF, SW4-4 OFF
  • Model code 14: SW4-1 ON, SW4-2 OFF, SW4-3 ON, SW4-4 OFF
  • Model code 12: SW4-1 OFF, SW4-2 OFF, SW4-3 ON, SW4-4 OFF
  • Model code 9: SW4-1 ON, SW4-2 OFF, SW4-3 OFF, SW4-4 OFF
  • Model code 7: SW4-1 OFF, SW4-2 OFF, SW4-3 OFF, SW4-4 OFF

QUICK REFERENCE SUMMARY

Outdoor unit “service actions” via DIP switches

  • Cooling test run: SW1-1 OFF + SW1-2 ON (keep ON > 1 minute)
  • Heating test run: SW1-1 ON + SW1-2 OFF (keep ON > 1 minute)
  • Pump down: SW1-3 ON (keep ON > 30 seconds)
  • Forced defrost: SW1-4 ON (keep ON > 30 seconds)
  • Expansion valve initialization: SW2-3 ON (outdoor unit stopped)
  • Forced oil recovery: SW2-4 ON
  • Night operation fan mode: SW2-1 ON
  • Snow falling protection fan mode: SW2-2 ON
  • Base heater enabled: SW5-3 ON

End of DIP switch settings extract for AO90TPAMF.