ANL - ANLH 020-202
29
8. CHECKS AND FIRST START-UP / 9.. OPERATING CHARACTERISTICS
SAFETY AND CONTROL DEVICES
CHECK:
The manual high pressure pressostat,
which stops the compressor and genera-
tes and alarm when the discharge pres-
sure exceeds the preset value. The correct
operation is checked by closing the refri-
gerant isolating valve to the heat exchan-
ger (in cooling mode) and keeping a
check on the high pressure gauge, verify
the operation corresponds to the rated
value. Warning: in the event the pressos-
tat does not operate at the rated value
immediately stop the compressor and
investigate the cause. Reset is manual
but can only be done when the pressure
drops below the differential setting. (For
the values of the trip and differential set-
ting refer to the technical manual).
Anti-freeze protection
The electronic control of the anti-freeze
protection is from the water tempe-
rature sensor leaving the evaporator
prevents freezing of water when the
temperature is too low. The operation
of the antifreeze protection can be
checked by increasing the setpoint
value until it is above the temperature
of leaving water and checking the wa-
ter temperature with a high precision
sensor. Confi rm that the unit stops and
generates the responding alarm. After
this check reset the anti-freeze setpoint
to the original value.
8.4. CHANGE OF SEASON
8.5. CHANGE OF SEASON FROM
UNIT CIRCUIT BOARD
Access the
USER SET
menu with the
key and confi rm the password 000
pressing key . Using the arrow key
display the parameter
STA
index 0
of the menu and select pressing the
key .Using the arrow keys select
the value for either:
VALUE 0
cooling
mode operation, or,
VALUE 1
heating
mode operation. Confi rm the selec-
tion pressing key and exit the menu
with the key .
8.6. CHANGE OF SEASON FROM
PR3 REMOTE PANEL (ACCESSORY)
If the PR3 remote panel (accessory)
is installed it must be enabled after
making the electrical connections.
8.6.1. REMOTE PANEL ENABLING
Access the
INSTALLER SET
menu with
the key and insert the menu access
password:
password installer 030.
Using the arrow keys display the para-
meter
PAN
index 9 of the menu and se-
lect pressing the key . Using the arrow
keys select from the desired values of:
• VALUE 1:
SEASON CHANGE
from the unit
circuit board
ON/OFF CONTROL
from the PR3
• VALUE 2
:
SEASON CHANGE
controlled
from the PRO3
ON/OFF CONTROL
from the unit
• VALUE 3:
SEASON CHANGE controlled from
the PRO3
ON/OFF CONTROL from the PRO3
Confi rm the selection pressing key
and exit the menu with the key
Once the PRO3 remote panel is ena-
bled the change of season selection
can be made directly from the switch
(fi g.1). The unit will automatically
switch on and off with the selected
operating mode.
For further information refer to the
USER manual.
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 se-
conds in cooling mode.
- Minimum time from last start 300
seconds in heating 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 fl ow is stabilised, the
pressure differential/ fl ow switch con-
trol 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 tem-
perature 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 fi tted electric heaters
on the heat exchanger are turned on,
and turned off when the water tempe-
rature exceeds 5°C. The water pump
always remains active.
9.6. WATER FLOW ALARM
The unit has a low water fl ow rate
alarm using a factory fi tted differen-
tial pressure switch or fl ow switch.
This safety activates after the fi rst 30
seconds of pump operation if the
water fl ow rate is not suffi cient. The
operation of this alarm stops the com-
pressors and the
pump.
WARNING
11
The anti-freeze setpoint can
only be adjusted by an authori-
sed service centre and only after
verifying that the hydraulic circuit
has the correct % of anti-freeze
solution.
12
If this alarm occurs immedia-
tely call the authorised technical
service assistance.
WARNING
FOR 230V/1/50Hz UNITS:
The unit is provided with a com-
pressor soft starter. This device
contains capacitors that could
overheat through repeated quick
starts. If power supply is remo-
ved wait at least 3 minutes befo-
re powering up.
