Operation manual
7
ERAP110~170MBYNN
Air-cooled condensing units
4PW22681-1
When a circuit is OFF, the following status information may
appear.
•
: one of the circuit safety devices is activated
(refer to
•
: the circuit is limited by a remote contact.
•
: the actual value of one of the software timers is
not zero (refer to
•
the circuit is ready to start up when extra cooling
load is needed.
The preceding OFF messages are written down in order of priority. If
one of the timers is busy and one of the safeties is active, the status
information says
.
The
is written down on the bottom of the screen.
The percentage is the actual cooling capacity of the unit.
3
Press the
h
key to enter the next screen of the readout menu.
The
screen of the readout menu provides
information concerning the pressures of circuit.
■
: high pressure of the refrigerant in circuit. The first
number stands for the pressure in bar, the second number
stands for the bubble point saturation temperature in degrees
Celsius.
■
: low pressure of the refrigerant in circuit. The first
number stands for the pressure in bar, the second number
stands for the dew point saturation temperature in degrees
Celsius.
4
Press the
h
key to enter the next screen of the readout menu.
This menu is available if voltage and current transmitters are
installed. This readout menu provides information concerning
the voltage and the compressor current.
5
Press the
h
key to enter the next screen of the readout menu.
To consult actual operational information about the ambient
temperature and the total running hours of the compressor.
6
Press the
g
key to return to the other readout menus.
Adjusting the temperature setpoint
The unit provides definition and selection of two independent
temperature setpoints.
■
: setpoint 1,
■
: setpoint 2.
The selection between setpoint 1 and 2 is done by a remote dual
setpoint switch (to be installed by the customer). The actual active
setpoint can be consulted in the readout menu.
If the manual control mode is selected (refer to
), none of the above-mentioned setpoints will be active.
To adjust a setpoint, proceed as follows:
1
Enter the setpoints menu. Refer to the chapter
If the user password is disabled for setpoint modifications (refer
to
immediately enter the setpoints menu.
If the user password is enabled for setpoint modifications, enter
the correct code using the
g
and
h
keys (refer to
). Press
q
to confirm the password
and to enter the setpoints menu.
2
Select the setpoint to be adjusted using the
q
key.
A setpoint is selected when the cursor is blinking behind the
setpoint's name.
The "
" sign indicates the actual active temperature setpoint.
3
Press the
g
and
h
keys to adjust the temperature setting.
The default, limit and step values for the cooling temperature
setpoints are:
4
Press
q
to save the adjusted temperature setpoint.
When the setting has been confirmed, the cursor switches to the
next setpoint.
5
To adjust other setpoints, repeat from
step 2
.
Resetting the unit
When a unit safety occurs, one compressor is shut down. The
safeties menu will indicate which safety is activated. The
screen of the readout menu will indicate
. The red LED inside the
p
key lights up and the buzzer
inside the controller is activated.
If the unit has been shut down due to a power failure, it will carry out
an autoreset and restart automatically when the electrical power is
restored.
To reset the unit, proceed as follows:
1
Press the
p
key to acknowledge the alarm.
The buzzer is de-activated.
The controller automatically switches to the corresponding
screen of the safeties menu: unit safety or circuit safety or
network safety.
2
Find the cause of shutdown and correct.
Refer to
"Listing activated safeties and checking the unit status"
When a safety can be reset, the LED under the
p
key starts
blinking.
3
Press the
p
key to reset the safeties that are no longer active.
If required, enter the
or the
. (Refer to the installation manual "Setting the
password for safety reset".)
Once all safety devices are de-activated and reset, the LED
under the
p
key goes out. If one of the safeties is still active, the
LED under the
p
key goes on again. In this case, return to
NOTE
The customer is also allowed to define a setpoint in
function of an analog input.
NOTE
Refer to "Customization in the service menu" chapter
"Setting of the changeable inputs and outputs" in the
installation manual
default value
limit values
(a)
(a) The lower limit of the cooling temperature setpoint can be
adapted by changing the minimum operating temperature in
the service menu (refer to the installation manual). The
following values apply:
: 2°C, 0°C, –5°C, –10°C
!
-->
"
step value
#$
NOTE
Also consult
"Defining the floating setpoint settings" on
If the user shuts down the power supply in order to repair a
safety, the safety will automatically be reset after power-up.
NOTE
The history information, i.e. the number of times a unit
safety or a circuit safety occurred and the unit status at
the moment of shutdown, can be checked by means of
the history menu.
