Liebert 272014 User Manual
Hiline Slim
Service Manual
Manuale di Assistenza
English
Italiano
cod. 272014 - rev. 12.01.2001
Issued by TDS
Caution
It is recommended that:
the manual is retained for the entire service life of the machine;
the user reads the manual carefully before carrying out any operations on the machine;
the machine is used exclusively for the purpose for which it is intended; incorrect use of the machine shall release
the manufacturer from any liability.
This manual has been prepared to enable the end-user to carry out only the operations that can made with the pan
els closed. Any operations that require the opening of doors or equipment panels must be carried out only by quali
fied personnel.
Each machine is equipped with an Electric Insulating device which allows the operator to work in conditions of
safety. This device must always be used to eliminate risks during maintenance (electric shocks, scalds, automatic
restarting, moving parts and remote control).
The panel key supplied with the unit must be kept by the person responsible for maintenance.
For identification of the unit (model and serial no.) in case of the necessity for assistance or spare parts, read the
identification label placed on the outside and inside of the unit.
IMPORTANT: this manual may be subject to modification; for complete and up-to-date information the user
should always consult the manual supplied with the machine.
Index
1 - Preliminary operations 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 - Foreword 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 - Operating limits 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 - Sound pressure levels 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 - Sealing the room 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 - Inspection 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 - Transport 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7 - Positioning of air conditioner 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.8 - Service area 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.9 - Wall holes 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 - Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 - Electrical and kit connections 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 - Electrical connections 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 - Emergency cooling kit (optional) 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 - Start-up 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 - First start-up (or after long halt) 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 - Start-up with low outside temperature 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 - Starting and stopping 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 - Operation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 - Adjustment of the condenser fan speed 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 - Emergency cooling (optional) 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 - Microprocessor controls 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 - Control logic 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 - Refrigerant R22 and oil charge 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 - Features of the refrigerating fluid R22 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 - Refrigerant charge 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 - Oil charge 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 - Calibrations 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 - Maintenance 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1 - Dismantling the unit 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 - Fault finding / alarms 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 - Spare parts 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 1
English
1 - Preliminary operations
1.1 - Foreword
The following manual describes the installation, opera
tion and maintenance of Air Conditioners, series Hiline
Slim (see Fig. 1).
IMPORTANT:
Also consult the manual for the Microface microproces
sor control supplied with the machine (if installed).
1.2 - Operating limits
The units are designed to operate within working ranges
(see Tab. 1).
These limits are referred to new machines or for those
that have been correctly installed and serviced.
The warranty clauses are no longer valid for any damage
or malfunction that may occur during or due to opera
tion outside the application values.
Tab. 1 - Operating limits
Power supply voltage
Outdoor conditions
Indoor conditions with
operating compressor
Storage conditions
External side protection
degree
230 V 10%/1/50 Hz
24/48 30% Vdc with INVERTER
da: -10C (-30C with VARIEX)
a: 43C
20C 30% R.H. e 20C 80%
da:
R.H.
a: 35C, 40% R.H.
da: -25C, 5% R.H.
a: 55C, 90% R.H.
IP 24
1.5 - Inspection
On receiving the equipment immediately inspect its
condition; report any damage to the transport company
at once.
1.6 - Transport
Always keep the unit vertically upright.
If possible transport the unit using a fork lift truck;
otherwise use a crane with belts or cables, avoiding
the exerting of pressure on the top edges of the pack
ing.
Unpack the unit as close as possible to its installation
position. Once unpacked, avoid stress being trans
mitted to its internal components.
1.7 - Positioning of air conditioner
The air conditioner can be installed in any indoor
location where it is not exposed to an aggressive
ambient.
Position the air conditioner so as to ensure optimum
air distribution within the area in which it is to oper
ate, preventing the creation of unconditioned zones.
For the correct positioning of the air conditioner see
Fig. 2 at the end of the manual.
1.8 - Service area
The unit must be provided with a suitable Service Area,
as follows (see Fig. 2):
All ordinary maintenance can be performed both
from the front side and from the rear side (external)
where a minimum area must be left free of obstruc
tions.
1.3 - Sound pressure levels
Tab. 2 shows, for the internal and the external side, the
maximum sound pressure levels of the units in standard
configuration, in continuous operation, at 2 m from the
front surface of the machine, at 1 m height in free field
conditions. The noise levels have the highest values at
the front of the unit, on the internal side.
1.4 - Sealing the room
To create stable indoor conditions make sure that the
room is airtight by sealing all gaps, cable entries, etc...
1.9 - Wall holes
Make the holes in the wall of the container next to the
unit's position (see Fig. 3).
English
page 2
272014 - 04.02.2000
Tab. 2 - Sound pressure levels
Model
p
PKS3
PKS4
Indoor, free field at 2 m
in front of the unit
Outdoor, free field at
2 m in front of the unit
Indoor, free field at 2 m
in front of the unit
Outdoor, free field at
2 m in front of the unit
2 - Installation
Octave band frequency (Hz)
Sound
pressure
31.5 63 125 250 500 1000 2000 4000 8000
[dB(A)]
49 56 62 58 55 54 53 53 51 61
50 51 49 54 51 51 47 44 37 55
49 56 62 58 55 54 53 53 51 61
50 51 49 54 51 51 47 44 37 55
level
For a correct installation proceed as follows (Fig. 4):
Provide the unit with cornice protection elements
(these can be supplied as optional), using the proper
holes and the self-tapping screws with 3.5 mm diam
eter.
In order to avoid that water filters inside the contain
er, provide it with an adhesive rubber gasket.
3 - Electrical and kit connections
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 switch QS1 is in open position (OFF);
the automatic switch QS2 on the outer clamps of the
inverter (if installed) are off;
there are no components under voltage.
3.1 - Electrical connections
(see the wiring diagram)
The electrical connections (power supply 230/1/50 and,
for emergency power supply (48 and 24 Vdc) will be car
ried out from the roof of the unit by means of some pro
per holes.
Let the electrical power supply cable (not supplied by
us), pass through the hole made on the unit roof.
Fix the cornice to the shelter wall by means of M4
screws with anchor.
Fix the lower cornice protection element by means of
two M4 screws with anchor.
Provide the unit roof with the fixing bracket to the
wall with two self-tapping screws with 3.5 mm diam
eter.
Note: For the power supply use a screened cable
(minimum section indicated in Tab. 4).
It is advisable to keep the mains power supply cable
as far as possible from the other cables coming out of
the inverter (optional).
Connect the 230V/1/50 Hz line to the main switch
QS1 placed inside the electrical panel.
Concerning the alarm contacts available in the differ
ent versions, these can be found on the terminal
board in the electrical panel.
For the alarm description see Chapter 6 and the
manual of the installed control.
To connect 2 or more units installed in the same con
tainer and provided with the MICROFACE control,
with HIROMATIC interface, use the HIROBUS
cable (supplied with the unit) by connecting it as
shown in the wiring diagram. See the Microface and
Hiromatic manual for the configuration of the
Stand-by units.
page 3
English
Tab. 3 - Standard electrical features
S4
20A
4
2
4
2
Evaporator fan Condenser fan Compressor
OA FLA LRA Nom. power
PKS3
PKS4
(*) In the following conditions (ARI 520-78):
1 - - 200 1.5 - - 340 5.9 10 34 1370 - 13 - 3000
1 - - 200 1.5 - - 340 7.1 12 36.5 1700 - 13 - 3000
Condensing temperature 54.4C,
Ambient temp. 35C,
Evaporation temp. 7.2C,
Sub-cooling temp.: 8.3C
Overheating temp.: 11C
[W]
OA FLA LRA Nom. power
Tab. 4 - Protection switch and cable sizing
Protection switch with differential current In = 0.3A
PKS3-PK
Heater
(2 x unit)
OA
[W]
V230/1/50Hz 230 Vac 24/48Vdc
FLA LRA Nom. power
(*)
[W] (*)
OA FLA LRA Nom. power
Cable sizing
2
mm
mm
[W]
2
3.2 - Emergency cooling kit
(optional)
The emergency cooling kit consists of an inverter and a
single-phase transformer installed inside the electric
board.
Operating as shown in par. 3.1, supply power up to 48
(24) Vdc inside the electrical panel, by means of a
screened cable with a minimum section as shown in
4 - Start-up
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 indi
cated on the identification plate of the unit.
After that, the conditioner can be started putting the
automatic switch QS1 to ON position. On the units pro
vided with this switch also press the ON-OFF push but
ton on the Hiromatic interface.
Check the electrical input of all components and
compare it with the data shown in the Tab. 3. Check that
there are no active alarms; wait until the system reaches
the standard operation and then make the following
checks:
check that the fans are working correctly;
make sure that the temperature is guaranteed and
the compressor and the heaters (optional) work
when required;
only on versions provided with the Variex option (speed
adjustment)make sure that the speed adjuster of the
fan of the condensing section is correctly calibrated
and controls the fan operation (see chapter 8).
Tab. 4. Connect the possible ground line to the positive
pole of the 48 Vdc power supply. Connect the cable
screening to the metal cable clamp and perform the con
nections following the wiring diagram carefully.
Attention: Connect the poles correctly.
As regards the units with emergency supply through
external Inverter, make the connections as specified in
the electrical diagram.
4.2 - Start-up with low outside temperature
In case of low outside temperature (<0C), the unit
start-up is helped by the delay time of the low pressure
alarm activation, within which the pressures in the refrig
erating circuit reach the standard operation values.
4.3 - Starting and stopping
For the units provided with HIROMATIC interface:
start the unit by pressing the ON-OFF push button
on the Hiromatic (confirmed by SYS.ON on the
display);
stop the unit by pressing the ON-OFF push button
on the Hiromatic (confirmed by SYS.OFF. on the
display).
Note: turn the main switch QS1 and the QS2 Inverter
switch off only if the unit is stopped for a long time.
For the units provided with the Microface control, you
can switch on/off using the main switch QS1, which is ac
cessible by opening the hinged higher panel acting on
quick lock system.
English
page 4
272014 - 04.02.2000
5 - Operation
The unit operation is completely automatic.The below
sequence explains (with the assistance of Fig. 5 - Opera
tion diagram) how the unit operates (see also Fig. 6
Refrigerating circuit):
1) The temperature sensor, positioned inside the shel
ter, informs the control about the condition of the air
to be conditioned.
2) The control compares the received information with
the Set Point values (= min. indoor temperature
required) and Differential programmed values, pre
setting the air conditioner for the air conditioning
with the following modes:
Cooling (Fig. 5)
The compressor (9) and the fans (6) and (10) are started
up when the temperature of the room to be conditioned
exceeds the preset value. The intake air from the centrif
ugal fan (6) enters the unit through the lower gap (A),
goes immediately through the filter (1) and then the
evaporator (5).
The cool refrigerant flows through the evaporator (5),
thus cooling the air passing through it. The conditioned
air is conveyed into the conditioned room through the
discharge opening (B).
The heat taken from the room and the one generated by
the conditioner motor operation are disposed through
the condenser (11) placed in the lower part of the unit
and hit, thanks to the fan (11), by the outside air. The fan
operation is managed in ON - OFF mode (or with
Variex, see par. 5.1) as a function of the condensing pres
sure.
For the operation logics of the control see chapter 6.
Heating (optional)
The air heating is achieved by means of electric heaters
(7), located in the air flow and activated according to the
logics set on the control (see chapter 6).
The manual reset of the safety thermostat (15), placed
on the electrical heaters is carried out throught the front
after removing the grill panel.
Cooling in Freecooling (optional) - (Fig. 5)
When the outside air temperature is lower than the
inside air temperature by some degrees, it is possible to
use this difference to refresh the shelter inside part by
direct intake of the outside air, i.e. without using the
compressor. Thus it is possible to achieve a considerable
energy saving.
When the expected conditions occur, the servo-control
(2), managed by the Microface control, opens the mov
ing damper (12) separating the flows of the inside air and
outside air. In this way the outside air sucked by the fans
(6) flows inside the container and is discharged through
the openings of the condensing section. The air flows
present in this operation mode are shown in Fig. 5).
The opening degree of the damper is determined as a
function of the set point value to be kept and of the
intake air temperature (see chapter 6).
5.1 - Adjustment of the condenser fan speed
(compulsory for outside temperatures
-10 / -30C)
A sensor is positioned so as to detect constantly the con
densing pressure of the refrigeration gas. On the basis of
this information, an electronic device (Variex) adjusts
the fan rotation speed in order to keep the condensing
pressure within the allowed values. In this way, besides
optimizing the compressor operation, you can have a
remarkable reduction of the sound pressure level
(mainly during the night), an easier start-up of the com
pressor at low temperatures and some energy saving.
For the calibration of the speed adjuster refer to chapter
8.
5.2 - Emergency cooling
(optional)
This option is available for all those applications where it
is mostly important to guarantee air flow inside the shel
ter, even in the event of mains current drop. In this case,
by an inverter and a transformer, the units can be sup
plied by the emergency coils at 24 or 48 V dc (see Fig. 7).
The intervention mode of the emergency system
depends on the switch QS1 condition:
QS1 = ON
If the main power supply is not cut out, the emer
gency system remains inactive;
if there is no voltage on the main power supply line,
the inverter is automatically activated and, being sup
plied by the emergency coils at 24/48 V dc, by the
24/48 V / 230 V transformer it supplies the fan of the
evaporating section and the electronic control. So all
functions of the unit are still managed, allowing the
inside air to recirculate (or the outside air to come in,
if the unit is provided with freecooling) if the temper
ature inside the shelter is not within the permitted
range. In this operation mode, a relay contact (KM6)
signals the activation of the inverter system.
If the voltage of the emergency coils goes below the
safety value, the inverter system is automatically deactivated.
QS1 = OFF
In this abnormal condition occurring, for instance,
after a short-circuit in the unit the inverter is auto
matically de-activated.
CAUTION:
For safety reasons do disconnect the automatic switch
QS2 when you want to stop the unit.
page 5
English
6 - Microprocessor controls
The machine is available in four different operating con
figurations:
1) chill unit only;
2) chill and hot unit;
3) unit with freecooling, chill only;
4) unit with freecooling, chill and hot.
All versions are equipped with the new Microface
microprocessor control.
6.1 - Control logic
These units are managed by the Microface microproces
sor control and may be combined with the Hiromatic
control for the complete monitoring of all unit operation
parameters (see enclosed manual).
The control algorithm is based on a single-stage adjust
ment for the heating and cooling with the compressor
and on an adjustment of the proportional-integrative
type for the cooling in the Freecooling mode, with setting
of the set point and proportional band (P) (Fig. d.)
The control manages all activation delays of the com
pressor, and minimum times, in order to guarantee the
proper operation and to extend its life as much as pos
sible.
The activation of the Freecooling mode occurs as a func
tion of the difference (that can be set) between the inside
temperature and the outside temperature. This means
that if the difference between the 2 temperatures
increases beyond a certain value, the unit automatically
passes to the Freecooling function: the compressor is
de-activated and the analog output controls the
3-point servomotor of the damper. The damper open
ing is varied in order to maintain the inside temperature
equal to setpoint and as a function of the intake air tem
perature, which cannot be lower than a preset safety
value.
Fig. a Compressor, heater and damper opening opera
tion
P Band
Freecooling
mode
ing mode remains de-activated for 1/2 hour. If the inside
temperature exceeds the proportional band by more
than 50%, the Freecooling mode is immediately deactivated and remains in this condition for 1/2 hour and
the cooling by refrigerating compressor intervenes.
6.1.1 - Start-Stop
Altogether there are three ways for starting or stopping
the unit:
a) the isolator switch inside the electrical panel;
b) the digital input of the Microface card;
c) the ON-OFF push button on the Hiromatic interface
(optional).
Priority: a) b) c) must be considered as 3 series contacts;
only if all contacts are on, the unit can operate.
6.1.2 - Alarm control
The terminal board of the elertical panel is provided with
2 clean exchange contacts, on standard configuration,
used as follows:
1) General alarm:
compressor low pressure
compressor high pressure (reset on the pressure
switch)
sensor fault
memory fault
fan fault (with optional sensors)
2) General warning - signalling of various failure
conditions, among which:
high temperature
low temperature
heater thermostat (reset on the thermostat)
Notes:
both the alarm and the warning must be reset manu
ally on the Microface.
An alarm causes the unit to stop and the unit in
stand-by (if available) to intervene. If the unit is in
stand-alone, the high and low pressure alarms don't
stop the machine to allow the operation in Freecool
ing mode in the proper conditions.
The warning doesn't cause the unit to stop.
When the heater safety thermostat intervenes, the
reset will be carried out on the thermostat (15) acces
sibble by removing the internal fan side panel.
Set CoolingHeating C
P Band
Compressor
cooling mode
Set CoolingHeating C
If the inside temperature exceeds the proportional band
by more than 20% for longer than 10 minutes, the unit
passes to the cooling with compressor and the Freecool
English
page 6
6.1.3 - Optional alarm card
Besides the components described for the standard con
figuration, on the alarm card - which can be supplied as
optional - there are relay contacts to obtain the follow
ing alarms separated:
1) compressor high and low pressure
2) Clogged filter alarm
3) Fan fault
4) High temperature
5) Low temperature
These alarms cause the unit to stop in the same ways as
described in the previous paragraph.
For the detailed description of the alarms, see the Micro
face manual enclosed.
272014 - 04.02.2000
6.1.4 - Unit in stand-by
The control of the unit in stand-by is completely auto
matic thanks to the possibility to connect the Microface
control.
A unit in stand-by starts in the event of an alarm which
stops the main unit; this occurs even if the main unit is
switched off or disappears from the system due to a fault
on the control connecting bus.
The rotation per hour of the units in stand-by occurs
automatically every 24 hours, so as to allow a homoge
neous wear of the system components.
If the system is connected to the Hiromatic interface, it is
possible to set a different rotation control.
If several units are simultaneously working with the same
set point, the temperature used for the control is the
average of the detected ones; further, in the operation
with compressor, the proportional band is divided in as
many parts as twice the number of units belonging to the
system, so as to shut the total available refrigerating
capacity.
The operation in Freecooling mode is homogeneous and
simultaneous on all units.
Fig. b, shown as an example, describes the operation of a
system consisting of 3 units.
7 - Refrigerant R22 and oil charge
Fig. b System with 2 units in stand-by -
Microface control
Freecooling mode
P Band
1
2
3
Set CCoolingHeating
Compressor cooling mode
P Band
3
1 = main unit
2 = unit in stand-by
3 = unit in stand-by
11
223
Set CCoolingHeating
THESE OPERATIONS MUST BE PERFORMED BY
AN EXPERIENCED REFRIGERATION TECHNI
CIAN.
7.1 - Features of the refrigerating fluid R22
At standard temperature and pressure it is a colourless gas
with low toxicity, non-flammable, and it has an allowed
exposure limit value (AEL/TLV) corresponding to 1000
ppm (average value measured on 8 hours/day). In the
event of leakage, air the room before use.
7.2 - Refrigerant charge
WHEN REPAIRING THE REFRIGERATION CIR
CUIT RECUPERATE ALL REFRIGERANT IN A CON
TAINER: DO NOT ALLOW IT TO ESCAPE.
1) Start the unit as described in par. 4.1.
2) Start the compressor manually.
3) Guarantee a constant condensation temperature
(preferably 42-45°C); if necessary, partially obstruct
the condenser coil surface or limit its ventilating
power to obtain these conditions.
4) Charge the unit with the quantity of refrigerant R22
as shown in Tab. 5 and wait until the operating condi
tions of the whole refrigeration circuit are normal.
5) Check that the overheating is 7-8°C.
Tab. 5 - Refrigerant charge
MODEL
PKS3 PKS4
Refrigerant charge (g)
1500 1700
7.3 - Oil charge
The oil to be used when topping up is SUNISO 3GS; if
SUNISO 3GS is unavailable use an oil with the same
characteristics (see Tab. 6).
NEVER MIX DIFFERENT OILS TOGETHER.
CLEAN THE PIPING COMPLETELY BEFORE
CHANGING THE TYPE OF OIL USED.
Tab. 6 - Suniso 3GS oil (standard)
approx. specific weight (at 15C)
flash point (C.O.C.)
pour point
ENGLER viscosity at 50 C
viscosity index
copper corrosion (100 C, 3 hours) ASTM D130
neutralization value
conradson carbon residue
dielectric strength
:
0.91 kg/l
:
170 C
:
-40 C
:
2.7 E
:
0
:
1
:
0.03 max.
:
0%
:
> 30 kV
page 7
English
8 - Calibrations
The air conditioner has already been factory-tested
and calibrated as described below.
For the MICROFACE calibrations refer to the rele
vant manual (to avoid wrong operations do not use
COMPONENT Setting (LP) NOTES
Low pressure
switch (LP)
High pressure
switch (HP)
Fan
pressure switch
(SP)
STOP : 1.2 bar
START : 2 bar
(fixed settings)
STOP : 26 bar
START : 20 bar
(fixed settings)
START : 18 bar
DIFF : 4 bar
(STOP : 14 bar)
(fixed settings)
temperature and rel. humidity set points/propor
tional bands which differ excessively from the stan
dard settings).
automatic
reset
manual reset
pressing the
push button
Fan speed
adjuster
SET. : 16 bar
BAND P : 3.5 bar
(For the adjustment refer
to the instructions supplied
with the machine)
English
page 8
272014 - 04.02.2000
9 - Maintenance
For safety reasons, clear the unit opening the switches
QS1 and QS2 before performing any maintenance
operations.
If installed:
AS THE HIROMATIC/MICROFACE FEATURES
AUTOMATIC RESTART (AFTER A SUPPLY
INTERRUPTION) IT IS ADVISED TO DISABLE
AUTORESTART AND OPEN THE SWITCH QS
WHEN PERFORMING ANY MAINTENANCE.
Maintenance program - Monthly check
Check that the fan motor rotates freely without any abnormal noise, and ensure
FANS
AIR FILTERS
HIROMATIC/MICROFACE
ELECTRICAL
CIRCUIT
REFRIGERATION
CIRCUIT
that the bearings are not running hot.
Also check the current absorption.
Check the filter conditions; if necessary clean or replace them.
How to replace:
remove the upper panel of the unit
extract the filter from its seat horizontally
introduce the spare part
close the panel
In very dusty environments perform this check more frequently.
Verify the operation of the HIROMATIC/MICROFACE's LEDs, display and
alarms.
Check the power supply on all phases.
Ensure that all electrical connections are tight.
Check the evaporating pressures (to be done by a refrigeration technician).
Check the compressor current absorption, its head temperature and the pres
ence of any unusual noise.
Ensure that there is no ice formation on the evaporator.
Every day check the Hiromatic/Microface readings for
temperature and, if shown, ambient relative humidity.
The Maintenance Programme described below
should be carried out by a skilled technician, prefer
ably working under a maintenance contract.
9.1 - Dismantling the unit
The machine has been designed and built to ensure con
tinuous operation.
The working life of some of the main components, such
as the fan and the compressor, depends on their mainte
nance.
If the unit has to be dismantled, this must be done by
skilled refrigerator technicians.
The refrigerating fluid and the lubricating oil in the cir
cuit must be disposed of in conformity with the laws in
force in your country.
page 9
English
Loading...