Carrier 42LUVH025N - 8.5 Cooling Mode

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If the exhaust temp. of compressor is higher than 115ć and lasts for 5 seconds, the compressor stops
and does not resume until the exhaust temp. is lower than 90ć
8.3.5 Inverter module Protection, Inverter module Protection itself has a protection function against current,
voltage and temperature. If these protections happened, the corresponding code will display on indoor unit
LED.
8.3.6 Sensor protection at open circuit and breaking disconnection
8.3.7 Fan Speed is out of control. When Indoor Fan Speed is too low (lower than 300RPM for 60 seconds),
the unit stops and LED displays failure information and can’t return to normal operation automatically.
8.3.8 Cross Zero signal error warning. If there are 20 alternations of Cross Zero signals are incorrect, the
unit stops and LED displays failure information. After resuming, the motor rotates again. The spacing of Cross
Zero signal is 6-13ms.
8.3.9 Indoor fan delayed open function
For all modes, when the units are turned on, the indoor fan can operate 10 seconds after the action of louver.
8.3.10 Compressor preheating function.
1) Preheating permitting condition:
If T4(outdoor ambient temperature˘3ć and the machine connects to power supply newly or if T4˘3ć
and compressor has stopped for over 3 hours, the compressor heating cable will work.
2) Preheating mode:
A weak current flows through the coil of compressor from the wiring terminal of compressor, then the
compressor is heated without operation.
3) Preheating release condition:
If T4˚5ć or user turns on the machine and compressor runs, preheating function will stop.
8.3.11 Compressor heating cable (optional)
If outdoor temperature is lower than 5ć, the compressor heating cable begins to work. If outdoor temperature
is higher than 15ć, the compressor heating cable will stop working.
8.4 Fan-Only Mode
8.4.1 Temperature setting function is disabled, and no setting temperature display.
8.4.2 In this mode, the action of louver is the same as in cooling mode.
8.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24ć setting
temperature.
8.5 Cooling Mode
8.5.1 The After start the operation frequency of compressor submits to following rule.
T1 – 24
mediu
3.
3.
1.
1.
ć
high
low
ΔT=(room temp)–(setting temp)