MAXA i-32V5C MIDI 0121 - Fan Control, DHW, and Remote Functions

15
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 : se , the compressors restart when the discharge
probe temperature is lower than the setpoint 10°C:
REGULATION IN HEAT MODE
• Tw,out,set = seng setpoint in heat mode
•  = Tw,out,set – Tw,in,set
• b05 = compressor regulaon delta cut-o = 0,2°C (default)
• b25 = compressor regulaon delta cut-on= 2°C
RPM
Tw,out (outlet water temp.)
Tw,out,set
HzMaxReg
OFF
HzMin
b05
∆T,set + 2°C
• The compressor shutdown is regulated by parameter b05: the compressor shutdown when 
• The compressor restart when 
EXCEPTION: if    , the compressors restart when the discharge probe temperature is lower than the setpoint 10°C:

10. FAN
The unit's fan is controlled depending on the operaon of the compressor. Venlaon is controlled according to the condensing pressure in
cooling mode or according to the evaporang pressure in heang mode. Pre-venlaon takes place every me the compressor is switched on
and o.
SILENCED VENTILATION
Conguring a digital input DI9 with parameter H53=25 it is possible to manage the funcon of silent venlaon management.
Parameter VALUE 
H53
0 (default) Funcon disabled
25
Open contact -> standard mode
Close contact -> silenced mode
With the funcon acve, the noise, output and power of the unit are limited, for addional informaon see the installer user manual.
11. COMPRESSOR CRANKCASE RESISTENCE
The crankcase resistence is acvated if the compressor has been o 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 producon of domesc hot water it is necessary to connect a probe to the analogue input ST6 to be posioned inside the tank (the
relave terminals are indicated in chapter 5 or on the electrical diagram). Once the DHW temperature probe has been posioned and connected,
it must be enabled by seng parameter H17 = 6.
The DHW valve must be connected to digital output DO6 (see Chapter 5), and the relave control must also be enabled with parameter H84 =
6 (default).
The domesc hot water (DHW) funcon is controlled through parameter H10:
Parameter VALUE 
H17 6 DHW temperature probe
H84 6 DHW valve control