30
18.01. 6755441_03
ANL-ANLH 020-202
EN
• SEASON CHANGE
controlled from the PR3
• ON/OFF CONTROL
from the PR3
Confirm the selection pressing key and exit the
menu with the key
Once the PR3 remote panel is enabled the change of
season selection can be made directly from the switch
(fig.1)
. The unit will automatically switch on and off
with the selected operating mode.
For further information refer to the USER manual.
(fig.1)
9.
OPERATING CHARACTERISTICS
9.1. COOLING SETPOINT
(Factory default) = 7°C, ∆t = 5 K.
9.2. HEATING SETPOINT
(Factory default) = 45°C, ∆t = 5 K.
In the event of a momentary power interruption the
selected operating mode will be retained in memory.
9.3. COMPRESSOR DELAY TIMERS
To avoid excessive compressor starts two functions are
provided:
- Minimum time from last stop 60 seconds in cooling
mode.
- Minimum time from last start 300 seconds in heat-
ing mode.
9.4. CIRCULATING PUMPS
The wiring schematic provides outputs to control
the circulating pumps. The system side pump starts
immediately and after 30 seconds of operation, when
the water flow is stabilised, the pressure differential/
flow switch control function is enabled. If no alarms
are present the unit will start.
9.5.
ANTI-FREEZE ALARM
The alarm
11
is always active even in standby mode.
To prevent damage to the plate heat exchanger by
freezing of the water within the unit is stopped and
an alarm raised if the water temperature drops below
the minimum anti-freeze setpoint of 3°C. The unit can
only re-start after a manual reset and if the anti-freeze
sensor reads a water temperature above 4°C
12
. With
the unit in off mode and with a water temperature
below 4°C the factory standard fitted electric heaters
on the heat exchanger are turned on, and turned off
when the water temperature exceeds 5°C. The water
pump always remains active.
9.6. WATER FLOW ALARM
The unit has a low water flow rate alarm using a fac
-
tory fitted differential pressure switch or flow switch.
This safety activates after the first 30 seconds of pump
operation if the water flow rate is not sufficient. The
operation of this alarm stops the compressors and the
pump.
WARNING
11
The anti-freeze setpoint
can only be adjusted by an
authorised service centre and
only after verifying that the
hydraulic circuit has the cor-
rect % of anti-freeze solution.
12
If this alarm occurs immediate-
ly call the authorised technical
service assistance.
WARNING
FOR 230V/1/50Hz UNITS:
The unit is provided with a compres-
sor soft starter. This device contains
capacitors that could overheat
through repeated quick starts. If
power supply is removed wait at
least 3 minutes before powering up.
Summary of Contents for ANL 020
Page 33: ......
