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Micro Data Center Level A
The minimum break time is 3 min. The switching diffe-
rence is 2 K, but can be set in the range 2 – 10 K.
EN
To avoid short switching cycles and hence the danger
of inadequate or only partial cooling in some sections
of the Rittal Micro Data Center Level A, the switching
difference should be set to be only as low as neces-
sary. For economic reasons (energy saving), the no-
minal value of the internal enclosure temperature T
should also be set to be only as low as necessary.
6.2.3 Operation of the Comfort controller
(see Tab. 3, page 18 "Programming")
The display terminal H1 consists of a 3 position
7-segment display which indicates the internal enclo-
sure temperature in °C or °F (changeable) as well as
any fault codes. The actual Micro Data Center Level A
internal temperature is constantly displayed on H1.
When a system message is generated, this alternates
in the display with the current internal Micro Data
Center Level A temperature. When the unit is pro-
grammed, the programming level and the specified
value is also shown on the display.
Test mode
By simultaneously holding down keys H2 ( °C key)
and H4 ( /set key) for 5 seconds, the cooling unit will
commence cooling operation, irrespective of the set-
point. The door limit switch function is disregarded in
such cases. After approximately 5 minutes or upon
reaching 15°C, the device deactivates cooling opera-
tion once again.
6.2.4 Programming of the Comfort controller
In the EPROM of the Comfort controller various para-
meters are stored which can be changed by using the
buttons H2, H3 and H4. 24 changeable parameters
can be set via 24 programme levels in the stated ran-
ges (max. and min. values).
To this end, input code "22" is required (see also
page 20, fig. 16 "Programming").
The H2, H3 and H4 keys are multiple occupancy.
To access programming mode, "set" is to be pressed
and held down for 5 sec.
Primary occupancy (only diode displays):
H2: °C, H3: °F, H4: Alarm
Secondary occupancy (for programming):
H2: Arrow upwards, H3: Arrow downwards, H4: set
Programming via diagnostic software (Model
No. 3159.100) is also an option. The programming
cable interface is the connecting cable plug, located
on the rear of the Comfort controller. To do this, the
louvred grille must be removed.
6.2.5 System messaging equipment
All system messages at the cooling unit are recorded
and displayed as an error number by H1. System
messages alternate in the display with the current in-
ternal Micro Data Center Level A temperature (see
page 17, tab. 2 "Comfort control fault display and er-
ror analysis").
16
6.2.6 System message contacts
Both relays are normally closed. All system messa-
ges assigned to an individual relay result in it ope-
ning. If the control voltage fails, this also results in the
relay opening and can hence be captured and docu-
mented in the log file. According to individual weigh-
ting, all system messages can be assigned to both re-
i
lays or suppressed. Terminal strip X3 provides the
connection. See page 21, "Wiring diagram", for con-
tact data and occupancy.
K1/K2 fault signal relay (normally open contact):
Terminal 3: Fault signal relay 1
Terminal 4: Voltage supply connection for both fault
signal relays
Terminal 5: Fault signal relay 2
6.2.7 Door limit switch S1
Where a door limit switch is used and the enclosure
door is open (contact is closed when door is open),
the cooling unit (fans and condenser) will switch off af-
ter approx. 15 sec. This only applies to devices with a
comfort controller and devices with a threephase con-
nection to the basic controller.
For devices with a basic controller (115 V, 230 V and
400 V, 2~), the internal fan is not switched off when
using a door limit switch.
Thereby avoiding an increase in condensation while
the door is open. To avoid cyclic operation, switchon
of condenser and external fan is delayed by about
3 minutes after the cooling unit has been switched off.
The internal fan will start up after about 15 sec. on
closure of the door. Connection is made at the termi-
nals 1 and 2. The extra low voltage is supplied by the
internal power pack, current is approx. 30 mA DC.
Each door limit switch must only be assigned to one
cooling unit. Several door limit switches may be ope-
rated on one cooling unit (parallel connection). The
minimum cross-section of the connection cable is
0.3 mm
the door limit switch contact must not exceed a maxi-
mum of 50 Ω.
Connect the door limit switch free from potential only,
no external voltage!
Note!
The electrical signals at the interface are of an
extralow voltage (not extra-low safety voltages to
EN 60 335). Always heed the following notes!
• De-energise the cooling units to be connected.
• Ensure proper electrical insulation.
• Make sure the cables are not laid in parallel to
power lines.
• Make sure that the lines are short.
We reserve the right to further technical modifications of our products. Version 3.0 / 07.2013
(K1 and K2; potential free)
(supplied by customer)
2
for a cable length of 2 m. The resistance of
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