Trane Picco R3206A Manual page 16

The circulator is at maximum speed in DHW production.
Note: If the parameter r33 > 0, then the circulator can be running on call even to activate the system and/or sanitary heater, see par.10.8.
7.6 SYSTEM VENTING
Function used to vent the system, with the circulator at maximum speed.
To enable the function:
• Controller OFF
• Access the parameters PRG ->PSS ->PRG -> (enter Service password)
• Press the UP and DOWN keys simultaneously for 3 seconds
The circulator switches on at maximum speed, and then switches off after 5 minutes.
The system venting cycle can be exited manually by pressing the MODE/ESC key, or by pressing the UP and DOWN keys simultaneously for 3
seconds.
During this function, the flow switch alarm is disabled, the maintenance technician must guarantee that there is water inside the system.
8. COMPRESSOR OR ACTIVATION LOGIC
The restart of compressors is in operation of a set point refered to the inlet water temperature. It is based on calculation of Si basa sul calcolo
di ∆T,set which is the difference between outlet water temperatures and inlet water temperatures, detected while the compressor for thermo-
regulation is turning off.
8.1 REGULATION IN COOLING MODE
• Tw,out,set = adjusted setpoint in cooling
• ∆T,set = Tw,out,set – Tw,in,set
• b05 = compressor delta cut-off set= 0,2°C (default)
• b25 = delta cut-on compressor set= 2°C
RPM
HzMaxReg
HzMin
OFF
• The compressor shutdown is set by the parameter b05: the compressor shutdown when Tw,out < Tw,out,set - b05
• The compressor restart starts when Tw,out > (Tw,out,set + ∆T,set + 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).
8.2 REGULATION IN HEAT MODE
• Tw,out,set = setting setpoint in heat mode
• ∆T,set = Tw,out,set – Tw,in,set
16
Speed
[%]
P06/P09
P07
P08
Tw,out,set
∆T,set + b25
b05
Picco R32
P10
Tw,out (outlet water temp.)
Heat pumps inverter air/water with axial fans
ΔT
[°C]