MAXA i-32V5C MIDI 0121, Manual

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Controllo per i-32V5 MIDI
Air/water inverter chillers and heat pumps with axial fans
• The compressor shutdown is set by the parameter b05: the compressor shutdown when Tw,out < Tw,out,set - b05
• The compressor restart when
Tw,out > (Tw,out,set + ∆T,set + b25) EXCEPTION
: se
∆T,set > 8°C
, the compressors restart when the discharge
probe temperature is lower than the setpoint 10°C: Tw,out > (Tw,out,set + 10°C)
9.2 REGULATION IN HEAT MODE
• Tw,out,set = setting setpoint in heat mode
• ∆T,set = Tw,out,set – Tw,in,set
•
b05
= compressor regulation delta cut-off = 0,2°C (default)
• b25 = compressor regulation delta cut-on= 2°C
RPM
Tw,out (outlet water temp.)
Tw,out,set
HzMaxReg
OFF
HzMin
b05 ∆T,s et + 2°C
• The compressor shutdown is regulated by parameter b05: the compressor shutdown when Tw,out > Tw,out,set + b05
• The compressor restart when Tw,out < (Tw,out,set - ∆Tset – b25)
EXCEPTION : if ∆T,set > 8°C , the compressors restart when the discharge probe temperature is lower than the setpoint 10°C:
Tw,out < (Tw,out,set - 10°C)
10. FAN
The unit's fan is controlled depending on the operation of the compressor. Ventilation is controlled according to the condensing pressure in
cooling mode or according to the evaporating pressure in heating mode. Pre-ventilation takes place every time the compressor is switched on
and off.
10.1 SILENCED VENTILATION
Configuring a digital input DI9 with parameter H53=25 it is possible to manage the function of silent ventilation management.
Parameter VALUE Function
H53
0 (default) Function disabled
25
Open contact -> standard mode
Close contact -> silenced mode
With the function active, the noise, output and power of the unit are limited, for additional information see the installer user manual.
11. COMPRESSOR CRANKCASE RESISTENCE
The crankcase resistence is activated if the compressor has been off for at least 30 minutes and if the temperature measured by the discharge
probe is below 20 °C (with a hysteresis of 2.0 °C). When the compressor restarts, the crankcase resisitence is disabled.
12. ENABLING DOMESTIC HOT WATER PRODUCTION
To enable the production of domestic hot water it is necessary to connect a probe to the analogue input ST6 to be positioned inside the tank (the
relative terminals are indicated in chapter 5 or on the electrical diagram). Once the DHW temperature probe has been positioned and connected,
it must be enabled by setting parameter H17 = 6 .
The DHW valve must be connected to digital output DO6 (see Chapter 5), and the relative control must also be enabled with parameter H84 =
6 (default).
The domestic hot water (DHW) function is controlled through parameter H10 :
Parameter VALUE Function
H17
6 DHW temperature probe
H84
6 DHW valve control