Reference resistance specs for sensors used in Spartan Comfort units. Resistance values are measured at the stated test temperature. Wrong-sensor consequences are noted where documented.

Specifications

Sensor Reference

DRAFT

External temperature

15 kΩ @ 25°C

Too-high resistance: Detected outdoor temperature reads lower than actual, causing incorrect temperature-based control decisions.

Too-low resistance: Detected outdoor temperature reads higher than actual, causing incorrect temperature-based control decisions.

DRAFT

Internal temperature

15 kΩ @ 25°C

Too-high resistance: Detected temperature reads lower than actual. May cause shutdown errors in heating mode or startup failures in cooling mode.

Too-low resistance: Detected temperature reads higher than actual. May cause startup errors in heating mode or shutdown failures in cooling mode.

DRAFT

External coil

20 kΩ @ 25°C

Too-high resistance: Detected temperature reads lower than actual. May cause frequent entry into defrost mode, illusory defrost cycles, or protection errors during cooling.

Too-low resistance: Detected temperature reads higher than actual. May cause defrost failures during heating or protection activation during cooling.

DRAFT

Internal coil

20 kΩ @ 25°C

Too-high resistance: Detected temperature reads lower than actual. May cause high-pressure cold-blast protection during heating or frequent anti-freezing protection during cooling.

Too-low resistance: Detected temperature reads higher than actual. May cause frequent overheat protection during heating or overload protection during cooling.

DRAFT

Recirculated

20 kΩ @ 25°C

Too-high resistance: Incorrect back temperature value affects electronic expansion valve adjustment and four-way valve position confirmation during heating.

Too-low resistance: Incorrect back temperature value affects electronic expansion valve adjustment and four-way valve position confirmation during heating.

DRAFT

Exhaust

50 kΩ @ 25°C

Too-high resistance: Detected exhaust temperature reads lower than actual. The system may fail to activate protection when exhaust temperature is genuinely dangerous.

Too-low resistance: Detected exhaust temperature reads higher than actual. The unit enters high exhaust temperature protection frequently, compressor frequency threshold rises, leading to unwanted shutdowns. Example: installing a 20KΩ coil sensor in place of the 50KΩ exhaust sensor produces this behavior.