pag. 2
creased.
In these cases, Vertiv recommends a plenum damper
sized 600 x 400 mm (Vertiv code 134992) to be wall
or window mounted.
3
---
Electrical
connections
3.1
---
Cautions
Before performing any operations on the electric parts, make
sure that:
all electrical components are undamaged;
all terminal screws are tight;
the supply voltage and frequency are as indicated on the
unit;
the automatic switch
QF1
is in open position (OFF), for
units in “no emergency cooling version”.
the automatic switches
QF1
and
QF3
are in open position
(OFF), for units in “emergency cooling version”.
there are no components under voltage.
3.2
---
Electrical
supply
Let the electrical power supply (not powered) pass through the
holes placed in the back panel of the air conditioner (see from
Fig. 1 to Fig. 4).
Caution:
use screened cables for high voltage power supply,
with suitable section, and route them to the electrical panel.
Use copper conductors only.
Connect the power supply cable to the main switch QF1 inside
the electrical panel. Connect the earth cable to the yellow---
-green clamp. The alarm contacts available in the different
ver-sions are located inside the electrical panel. For the
alarms de-scription see chapter 6.5 and manual of the
installation control.
3.3
---
User
interface
The control microprocessor board is inside the electric board
and is connected with the user interface (remote display) that
can be positioned inside the room as wished. The user
interface (remote display), on a painted metal box, connected
with the conditioner through a multi---pole screened cable,
standard supplied.
The user interface is graphic type (with graphic display and
keypad).
3.4
---
Emergency
cooling
version
(EFC 48 VDC and EFC 230 VAC)
When this option is available let pass the supply cable as
de-scribed in par. 3.2 and connect them to switch QF3
according to the diagram.
In the 48---VDC units respect the polarity “+” and “---”.
In the EFC 230 Vac units the emergency electrical line has to
be always present.
3.5
---
Electrical
protection
Caution
: For the electrical protection of the conditioner an
adequate switch with current protection must be installed in
the power supply line. For the selection of the disconnect
switch please refer to the Tab. 7.
4
---
Starting
and
stopping
4.1
---
First
start---up
(or after a long halt)
Before starting the air conditioner do check if the power supply
voltage and frequency comply with those indicated on the
identification plate of the unit. After this, it is possible to power
the unit operating on the main switches QF1 and QF3
(only QF1 for units in “no emergency cooling version”), that
can be reached removing the front middle panel. For
the units equipped with microprocessor control, and after
having operated on the switches to ensure a suitable power
supply, it is possible to start and stop the unit following the
instructions here below.
On
the
user
interface
:
-
check that the fans are working correctly;
-
make sure that the temperature is guaranteed
and the compressor and the heaters (optional) work
when re-quired;
-
make sure that the speed adjuster of the fan of the
con-densing section controls the fan operation (see chap.
7).
Note:
turn the main switches QF1 and QF3 OFF (only QF1 for
units in “no emergency cooling version”) only if the unit is
stopped for a long time.
4.2
---
Start---up
with
low
outside
temperature
In case of low outside temperature (<0_C), the unit start---up is
helped by the delay time of the low pressure alarm
activation, within which the pressures in the refrigerating
circuit reach the standard operation values.
5
---
Operation
The unit operation is completely automatic. The below se-
quence explains (with the assistance of Fig. 11 and Fig. 12--- -
Operation
diagram
) how the unit operates (see also Fig.
13
---
Refrigerating
diagram
):
1)
The temperature sensor, positioned inside the conditioned
room, informs the control about the condition of the air to
be conditioned.
2)
The control compares the information received with the set
values of
Set
Point
(= wished min. inner temperature)
and Proportional Band (and differential in the versions
with
Freecoolingoption),settingthe
conditioner
for
theair
treatment in the following modes:
Cooling
(Fig. 11 and Fig. 12)
After switching the unit on, the evaporating fan is
immediately started while the compressor is started when the
temperature of the room to be conditioned exceeds the set
value. The con-densing fan is automatically started when
the condensing pressure changes. The air taken in by the
centrifugal fan enters the unit through the suction inlet,
immediately passes through the filter and then the evaporator.
The cold refrigerant flows in-side the pipes of the evaporator,
thus cooling the air crossing it. The treated air is conveyed in
the conditioned room through the delivery inlet. The heat
taken from the room and the one generated by the
conditioner motor operation are disposed through the
condenser placed in the lower part of the unit and hit, thanks
to the fan, by the outside air. The fan operation is
managed
with Variex, see par. 5.1 as a function of the con-design
pressure. For the operation logics of the control see chapter 6
Pressing the On/Off Key ( ) the Unit ON/OFF window will
appear. The unit is switched ON or OFF pressing the
Increase ( ) or Decrease
( )
Key for 3 seconds.;
Important!
I
t
is extremely important to consider the status of
the digital input of the microprocessor control managing the
unit ON ---OFF (see relevant handbook and wiring diagram).
Indeed, for the unit to start the digital input must be bridged
(see wiring diagram).
Check that there are no active alarms; wait until
the system reaches the standard operation and then make
the following checks:
