MAXA i-MAX 0466, Manual

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i-MAX
Industrial inverter air/water heat pump with axial fans
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7.3.6 SAFE TIME PERIODS
The compressors respect the minimum waiting time for the turning on and off actions (regardless of their configurations and if
they are inverters or ON/OFF type).
C01 = Minimum Off time of a compressor # 240 sec (default).
C02 = Minimum time between two start-up of the same compressor # 360 sec (default).
C03 = Minimum delay time between the start-up of a compressor and the next one # 10 sec (default).
C04 = Minimum delay time between the shutdown of a compressor and the next one # 0 sec (default).
7.3.7 EMERGENCY CONDITIONS
If an alarm is warned by one of the inverters, the compressor corresponding to the faulty inverter cannot startup and the error
code will be displayed, note that, the alarm of any inverter will stop the operation of the whole compressors.
When the serviceman operates on the appliance and decides to make it operating by extruding the compressor related to the
faulty inverter, in order to do that, he must change the value of the parameter N06 from 0 to 1.
Such setting will affect immediately the operation and will be memorized; the serviceman/installer should restore the setting
values once the fault inverter has been repaired or replaced.
7.3.8 DEACTIVATION OF THE COMPRESSORS FOR OUTDOOR TEMPERATURE
If the outdoor temperature sensor is configured and is not in trouble, so the compressors cannot work because of low outdoor
temperature. The function is enabled if:
• Outdoor temperature sensor integrated and operating.
• Parameter Pa r07 = 1.
7.4 HEAT PUMP MODE OPERATION
This is the normal operation in which the auxiliary electric heaters turn on if the heat pump fails to meet the setpoint temperature
within a reasonable time (see the paragraph related to auxiliary electric heaters).
7.5 HEAT DISSIPATION FAN MOTOR CONTROL
The control of the dissipation is as a function of the condensing pressure in chiller mode operation, whereas, it depends on the
evaporation pressure in heat pump mode operation.
The adjustment of the fan speed occurs depending on the operation of the compressor.
The fan stop is bypassed for a duration equal F12 beginning from a compressor startup of the circuit. During this period, if the
controller requires the cut-off, the fan will run at minimum speed. Please see paragraph 12.5 for changing the parameters.
7.5.1 FAN SPEED CONTROL
The condensation control depends on the condensing pressure in chiller mode and on the evaporation pressure in case of heat
pump mode.
The fan speed can be independently controlled by the compressors or under the actuation of the fan motor.
•
F05 = fan output mode
F05 = 0
: if all the compressors of the circuit are switched off and the fan is switched off. The fan stop is bypassed for a period equal
to F12 beginning from a compressor start-up of the circuit. During this period, if the controller requires the cut-off, the fan will run
at minimum speed.
F05 = 1
: The fan control is independent from the compressor (the fan motor operates only according to the condensing pressure).
Please see paragraph 11.5 for changing the parameters.
7.5.2 FAN SPEED CONTROL IN COOLING MODE
The fan speed control in cooling mode occurs according to the diagram shown below, where:
F06
= Minimum fan speed in cooling mode;
F07 = Maximum silent fan speed in cooling mode
F08 = Set temperature/pressure to the minimum fan speed in cooling mode
F09
= Fan motor linear band in cooling mode
F10 = Delta cut-off of the fan
F11 = Cut-off hysteresis and silent/maximum fan speed
F13 = Maximum fan speed in cooling mode
F14 = Set temperature/pressure to the maximum fan speed in cooling mode
F6 - F10 = Set forced fan stop for low condensing pressure