EN/07.2013/58/61
4.9.1. Night mode
During night time it’s possible to reduce the total noise level by limiting the fan speed.
The parameters involved are:
• M123 NIGHT MODE START TIME: pre-set = 0
• M124 NIGHT MODE STOP TIME: pre-set = 0
• M125 MAX EVAP. FAN SPEED DURING NIGHT MODE: pre-set = 75%
• M126 MAX COND. FAN SPEED DURING NIGHT MODE: pre-set = 60%
The max condenser fan speed is limited to reduce the fan noise.
When (M123 ≠ M124), the max condenser fan speed will be under timing control.
If (M123 < clock time < M124), the max condenser fan speed will be limited by the parameter M124.
If the clock time isn’t included between M123 and M124, the max condenser fan speed will be limited by M111.
When (M123= M124), the max condenser fan speed won’t be under timing control and it’ll always be limited by M111.
In this mode, also evaporator fan speed is limited to M125 setup parameter.
4.9.2. Bypass of Condenser Fan Speed limitation
Bypass condenser fan speed limitation if: Returns to normal condition when:
If PC probe is present: PC > M117 PC < (M117 – 1.5)
If TC probe is present: TC > M114 PC < (M114 – 5)
4.9.3. Triac Control
The parameters involved are:
• M105 CONDENSER FAN TRIAC PULSE LENGTH: pre-set = 1msec
• M106 LOWER LIMIT TRIAC CONTROL: pre-set = 20%
• M107 UPPER LIMIT TRIAC CONTROL: pre-set = 75%
The condenser fan speed is under the control of an algorithm, called phase cut, of the microcontroller which sets the
TRIAC analog output. The parameters M106 and M107 correspond to the min/max threshold of analog output signal to
have the min/max fan condenser speed.
For example, if the desired min condenser fan speed is 20% and the real one is 30%, the parameter M106 will have to
decrease. If the desired max condenser fan speed is 100% (the M111 has to be 100% in this case) and the real one is
90%, the parameter M107 will have to increase.
The parameter M105 is used for the algorithm and it must be set only from expert users.
4.9.4. Maximum EER function
The parameters involved are:
• M158 ENABLE DANFOSS COMPRESSOR: pre-set = NO
• M174 ENABLE MAX EER FUNCTION: pre-set = NO
• M175 GAS TYPE: pre-set = R407C
• M176 SET POINT FOR MAX EER FUNCTION: pre-set = 8 °C
• M177 MINIMUM CONDENSER TEMPERATURE FOR MAX EER FUNCTION: pre-set = 30 °C
• M178 MAXIMUM CONDENSER TEMPERATURE FOR MAX EER FUNCTION: pre-set = 60 °C
When M158 and M174 are set to YES, than the condenser fans status control uses as regulation parameter the difference
between the parameter M176 and (TC - TAE).
The TC values are computed by a polynomial based on PC and gas type. The PC is read by the Danfoss compressor.
The gas type is set by parameter M175. The polynomial works correctly in the following pressure range:
– PC = 2 ÷ 45 bar when R410a gas is used (M175 set to R410A)
– PC = 0 ÷ 30 bar when others gas are used (M175 set to a value different from R410A)
The condenser temperature is limited by parameters M177 and M178.
The band is set by parameter M99, while the integral time is set by parameter M100.
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