Operation manual
11
ERAP110~170MBYNN
Air-cooled condensing units
4PW22681-1
Defining BMS control
allows the user to control the unit from a supervisory system.
The
screen and
screen of the
service menu have to be used to set BMS parameters. Refer to
"Customization in the service menu" chapter "Defining the BMS
settings" in the installation manual.
Tasks of the timers menu
Checking the actual value of the software timers
As a protective measure and to ensure correct operation, the
controller's software features several countdown timers:
■
LOADUP (
– refer to the thermostat parameters): starts
counting when a thermostat step change has occurred. During the
countdown, the unit is not able to enter a higher thermostat step.
■
LOADDOWN (
– refer to the thermostat parameters): starts
counting when a thermostat step change has occurred. During
the countdown, the unit will not be able to go to a lower
thermostat step.
■
FLOWSTART (
– 15 sec): counts down when the
airflow/waterflow interlock contact is closed. During the
countdown, the unit cannot start up.
■
FLOWLEAD (
– refer to the flow control settings):
starts counting whenever the unit is switched on. During the
countdown, the unit cannot start up.
■
FLOWLAG (
– refer to the flow control settings): starts
counting whenever the unit is switched off. During the
countdown, the fan motor or pump motor keeps running.
■
STARTTIMER (
$
– 10 sec): starts counting
whenever a compressor starts up. During the countdown, no
other compressor can start up.
■
GUARDTIMER (
– 60 sec): starts counting when the
compressor has been shut down. During the countdown, the
compressor cannot be restarted.
■
ANTIRECYCLING (
– 600 sec): starts counting when the
compressor has started. During the countdown, the compressor
cannot be restarted.
■
STARTUPTIMER (
– 180 sec): starts counting
when the compressor has started. During the countdown, the
compressor is limited to a maximum capacitystep of 30%.
To check the actual value of the software timers, proceed as follows:
1
Enter the
. (Refer to the chapter
The controller displays the actual value of the
the loadup timer, the loaddown timer, the flowstart timer, the flow-
stop timer (when the unit is on and the flowstart timer has reached
zero), the pumplead timer and the pumplag timer.
2
Press the
h
key to check the compressor timers.
The controller shows the actual value of the
: the guard timers (one per circuit) and the antirecycling
timers (one per circuit).
3
Press the
h
key to check the remaining timers.
The controller shows the actual value of the
.
Tasks of the safeties menu
Listing activated safeties and checking the unit status
If the alarm buzzer is activated and the user presses the
p
key, the
controller automatically enters the safeties menu.
■
The controller will enter the
screen of the safeties
menu when a unit safety was the cause of shutdown.
■
The controller will enter the
screen of the
safeties menu when a safety of the circuit was activated.
1
Press the
p
key when the alarm buzzer is activated.
The appropriate safety screen with the basic information
appears. Press the
q
key to see the detailed information.
2
If more than one kind of safety is active (indicated by means of
W
,
X
or
C
), use the
g
and
h
keys to consult them.
Tasks of the history menu
Checking the safety info and the unit status after a reset
The information available in the safeties menu is also stored in the
history menu, where it is stored after resetting the unit or the circuit.
In this way, the history menu provides a means of checking the unit
status at the moment of the latest shutdown.
To check the safety info and the unit status, proceed as follows:
1
Enter the
. (Refer to the chapter
The controller enters the
screen which contains
the following information: the number of shutdowns, the unit
safety which caused the most recent shutdown and the basic
information at the moment of this shutdown.
2
Press the
g
and
h
keys to consult the
,
or
2
screens.
3
Press the
q
key to see the detailed information.
Tasks of the info menu
Consulting additional unit information
1
Enter the
through the main menu. (Refer to the
chapter
"How to enter a menu" on page 6
The controller enters the
screen which
contains the following information: the time and date.
2
Press
h
to consult the first
screen.
This screen contains information about the unit name and the
refrigerant used.
3
Press
h
to consult the next
screen.
This screen contains information about the controller's software
version.
4
Press
h
to consult the
screen.
This screen contains information about the PCB.
