Justification: Test Profile: 88S-C-04 does not align test and required responses. Two random "5." Clarification needed on Fan Only Mode with (fan speed) if fan speed may be adjusted based on set points.

Friday, May 29, 2026 | 10:52am
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2 comments

Nick Irons Member for 4 days 4 hours

  • For the 88S-C-04 updates here are my notes:
    • Required Response 4 and 5 are missing "Same" at the beginning of the result to be "Same as Step 1..."
    • Test 5 adds nothing new outside of cooling the temperature sensor, but the Required Response to 5 will never generate a fail. The result states "may be allowed to decrease". If the fans must shut off when in automatic and at set point that should be the result of the test. If fans should stay active in fan only mode & automatic, then that should also be the intent. If neither are the case as there's no requirement for either side, then this test should be removed entirely.

       

Lucas Salviano Member for 1 month

Hi,

Some points about the changes:

  • ID 88S-C-04:
    • Test 3:
      • "3. Same as Step 2.".
      • Justification: If the temperature is higher than the set-point and the fan is at auto speed the fans must turn off.
    • Test 5:
      • Keep note about Thermostat command:
        • "Note that THERMOSTAT_STATUS_1 Fan Speed shall be 0 (Automatic)."
      • Justification: We understand that this test doesn't have a failure condition, but it can be used to test the algorithm implemented for Fan Speed Auto (if it exists).

Points not related to the modifications, but in section 6.16.14.8. (Let me know if it would be better to start a new thread).

  • Introduction:
    • "During the delay, AIR_CONDITIONER_STATUS should be sent with Max Output Level 0 (0%) and Output Level 0 (0%)."
    • Question: Why is the "Max Output Level" changed to 0 when the load is in protection delay? Is this related to the state of the compressor and not about the compressor output capacity? (usually 100% or different values in special conditions, e.g. Eco Mode).
  • ID 88S-C-05:
    • Test 1:
      • "1. THERMOSTAT_COMMAND_1 is sent with Operating Mode = 4 (Fan Only), Fan Mode 1 (On), Fan Speed 0 (Auto)."
    • Justification: The description about this field behavior is:
      "Note that this is different than the “Fan Only” above. This forces the fan to be on all the time, but allows the heat and cool turn on and off according to the Operating Mode".
      Off Mode not operate any cool or heat operation, it does not make sense to operate the fans if the intention is to turn off AC all loads.