EN
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7.3.2 - CHECKS
With the pump running, perform the following checks:
•
Hydraulic circuit air bleed: operate the pump at 100% in manual mode) for as long as it takes to completely
purge the circuit air.
•
Hydraulic pressure between 1.5 and 2.0 bar
•
Hydraulic circuit water fl ow (see below)
•
Return water temperature of the system
NOTES
• PUMP
RELEASE
At the fi rst start-up or after long periods of inactivity of the unit, the pump could be mechanically blocked
for limestone or other reasons.
To unlock the pump, set the speed to 100% (in manual mode) and run the pump for at least 10 minutes; it
will unlock automatically.
After the pump has been released, let it run in any case again all the time necessary (always at 100%) to
purge well all the air of the system; then adjust the water fl ow as explained below.
• MINIMUM RETURN WATER TEMPERATURE (see section of user manual “RETURN WATER MINIMUM
TEMPERATURE PROTECTION”)
A water temperature safety (system return) prevents the heat pump from operating if the temperature is
lower than the heating authorization threshold with the heat pump (parameter 52). In this case, only the
electric backup heating is authorized to raise the water temperature and allow the heat pump to operate,
at any external temperature.
For this reason, the heat pump stops and the display will show the writing:
RWT
<
P52
•
STOP THRESHOLD OF OUTDOOR AIR TEMPERATURE (see section of user manual “OPERATING RANGE
OF HEAT PUMP/BACKUP HEATING”)
The operation of the heat pump is prevented if the outside temperature is below the stop threshold (param-
eter 40). Only the backup heating is authorized.
7.3.3 - WATER FLOW REGULATION PROCEDURE
The heat pump is equipped with a variable speed pump adjustable by a control system.
From the previous menu (pump speed setting) you can set pump speed during normal operation and re-read
the water fl ow at the set speed.
To change the pump speed, press
▲
or
▼
buttons until the desired fl ow rate is reached. After any change, wait
a few seconds for re-reading the fl ow to be stable.
•
Change the pump speed to obtain, depending on the application, the rated working capacity according to
the following table:
Application
Water
outlet t.
Indoor unit
AUAH AUBH
AUCH
AUDH
Outdoor unit
G50
G65
G80
G110
G140
Radiant surface
35°C
Flow m
3
/h
0.72
1.10
1.33
1.83
2.34
Fan coil
45°C
Flow m
3
/h
0.67
1.10
1.33
1.82
2.34
Low temperature radiators
55°C
Flow m
3
/h
-
0.55
0.64
0.88
1.12
S P E E D : 8 5 %
Q : 1.3 8 m 3 / h