Quincy Compressor QPNC1600 Instructions for use

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Cod. 2200780133 00 - Edition 10/2014 - 1
INSTRUCTION AND MAINTENANCE MANUAL
DRYERS
QPNC1600 - QPNC1800 - QPNC2500 - QPNC3000
Code
2200780133
01
Edit. 10/2014
READ THIS MANUAL CAREFULLY BEFORE CARRYING OUT ANY OPERATIONS ON THE
DRYER.

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2 - Edition 10/2014 Cod. 2200780133 00 -
CONTENTS
PART A: INFORMATION FOR THE USER
1.0 GENERAL CHARACTERISTICS
2.0 INTENDED USE
3.0 OPERATION
4.0 GENERAL SAFETY STANDARDS
5.0 DESCRIPTION OF DANGER SIGNALS
6.0 DANGER ZONES
7.0 SAFETY DEVICES
8.0 POSITION OF PLATES
9.0 DRYERS ROOM
10.0 TRANSPORT AND HANDLING
11.0 UNPACKING
12.0 INSTALLATION
13.0 DIMENSIONS AND TECHNICAL DATA
14.0 MACHINE ILLUSTRATION
15.0 PARTIAL ROUTINE MAINTENANCE
16.0 SCRAPPING THE DRYERS
17.0 TROUBLE-SHOOTING AND EMERGENCY REMEDIES
PART B: INFORMATION RESERVED FOR TECHNICALLY SKILLED PERSONNEL
18.0 STARTING UP
ATTENTION: THERE IS A COPY OF THE WIRING DIAGRAM INSIDE THE ELECTRIC PANEL
ADDRESSES OF ASSISTANCE CENTRES
In the event of breakdown or malfunction of the dryer, switch it off and do not tamper with it. If repairs are needed, apply
only to a technical assistance centre approved by the manufacturer and insist on the use of original spare parts. Failure
to comply with the above may endanger the safety of the machine.
INTRODUCTION
Keep this manual with care for future consultation; the use and maintenance manual is an integral part on the
dryer. Read this manual carefully before carrying out any operations on the dryer.
The installation of the dryer and all operations involving it must be performed in conformity with the regulations
in force concerning electric plants and personal safety.
CHARACTERISTICS AND SAFETY PRECAUTIONS
BEFORE REMOVING THE PROTECTIVE GUARDS TO CARRY OUT ANY MAINTENANCE ON THE MACHINE, SWITCH OFF THE ELECTRIC
POWER SUPPLY AND DISCHARGE THE RESIDUAL PRESSURE INSIDE THE UNIT.
ALL WORK ON THE ELECTRIC PLANT, HOWEVER SLIGHT, MUST BE CARRIED OUT BY PROFESSIONALLY SKILLED PERSONNEL.
The manufacturer does not accept responsibility for damage caused as a result of negligence of failure to abide by the
instructions given above.
THIS MACHINE IS NOT SUITABLE FOR EXTERNAL INSTALLATION
THIS MACHINE CORRESPOND TO THE ESSENTIAL SAFETY REQUIREMENTS FORESEEN FROM THE
EUROPEAN STANDARD (2006/42 CE).
THE LUBRICATING LIQUIDS AND OTHER EVENTUAL FLUIDS MUST NOT BE DISCHARGED IN THE
ENVIRONMENT. THESE POLLUTING AND HAZARDOUS PRODUCTS MUST COMPULSORY BE DISPOSED BY
CHARGING AUTHORISED AND SPECIALISED FIRMS ACCORDING TO THE DIFFERENT TYPOLOGY OF
PRODUCT.
DIFFERENTIATE THE COMPRESSOR COMPONENTS ACCORDING TO THE DIFFERENT CONSTRUCTION
MATERIALS (PLASTIC, COPPER, IRON, OIL FILTER, AIR FILTER ECC…)

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1.0 GENERAL CHARACTERISTICS
The dryer is a chilling machine with direct expansion and dry evaporator.
The air to be dried is sent to the heat exchanger in which the water vapour present is condensed: the condensate
gathers in the separator and is discharged outside through a steam trap.
2.0 INTENDED USE
The dryer has been built to dry the compressed air for industrial use. The dryer cannot be used in premises where there
is a risk of fire or explosion or where work is carried out which releases substances into the environment which are
dangerous with regard to safety (for example: solvents, inflammable vapours, alcohol, etc.).
In particular the appliance cannot be used to produce air to be breathed by humans or used on direct contact with
foodstuffs. These uses are allowed if the compressed air produced is filtered by means of a suitable filtering system
(Consult the manufacturer for these special uses.)
This appliance must be used only for the purpose for which it was specifically designed. All other uses are to be
considered incorrect and therefore unreasonable. The Manufacturer cannot be held responsible for any damage resulting
from improper, incorrect or unreasonable use.
3.0 OPERATION
The gaseous refrigerant coming from the evaporator (4) is sucked by the refrigeration compressor (1) and it is pumped
into the condenser (2). This one allows its condensation, eventually with the help of the fan (3); the condensed refrigerant
passes through the dewatering filter (8) and it expands through the capillary tube (7) and goes back to the evaporator
where it produces the refrigerating effect.Due to the heat exchange with the compressed air which passes through the
evaporator against the stream, the refrigerant evaporates and goes back to the compressor for a new cycle.
The circuit is equipped with a bypass system for the refrigerant; this intervenes to adjust the available refrigerating
capacity to the actual cooling load. This is achieved by injecting hot gas under the control of the valve (9): this valve
keeps constant the pressure of the refrigerant in the evaporator and therefore also the dew point never decreases below
(0 °C / 32 °F) in order to prevent the condensate from freezing inside the evaporator. The drier runs completely
automatically; it is calibrated in the factory for a dew point of 3 °C (37,4 °F) and therefore no further calibrations are
required.
DRYER FLOW DIAGRAM
1) REFRIGERANT COMPRESSOR
9) HOT GAS BYPASS VALVE
2) CONDENSER
10) AIR-TO-AIR EXCANGER
3) MOTOR FAN
11) DIGITAL CONTROLLER
4) EVAPORATOR
12) FAN CONTROL PRESSURE SWITCH
5) DEMISTER CONDENSATE SEPARATOR
13) MAX PRESSURE SWITCH
6) IMPURITY TRAP
14) LIQUID SEPARATOR
7) EXPANSION CAPILLARY TUBE
15) CONDENSATE DRAIN
8) REFRIGERANT FILTER
16) MIM. PRESSURE SWITCH
4.0 GENERAL SAFETY STANDARD
The appliance may be used only by specially trained and authorized personnel.
Any tampering with the machine or alterations not approved beforehand by the Manufacturer relieve the latter of
responsibility for any damage resulting from the above actions.
The removal of or tampering with the safety devices constitutes a violation of the European Standards on safety.
ALL WORK ON THE ELECTRIC PLANT, HOWEVER SLIGHT, MUST BE CARRIED OUT BY PROFESSIONALLY SKILLED PERSONNEL.
AIR INLET
AIR OUTLET
CONDENSATE
DRAIN

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5.0 DESCRIPTION OF DANGER SIGNALS
1) Dangerous
electricvoltage
2) Air not fit for
breathing
3) High pressure
4) Fan rotating
5) Hot parts
6.0 DANGER ZONES
6.1 DANGER ZONES
(1)
(2)
(3)
(4)
Risks present on the whole machine
FIG. 2
4
1
1
4
4
1
1
2
3
1
1
3
1
1
1
3
3
2
3
3
1
2
3
1
1

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7.0 SAFETY DEVICES
7.1 SAFETY DEVICES
1) Cooling fan shield
3) Earth
2) Shield
FIG. 3
1
3
1
1
3
2

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8.0 POSITION OF PLATES
8.1 POSITION OF THE DANGER PLATES (Fig. 4)
The plates fitted on the compressor unit are part of the machine; they have been applied for safety purposes and must
not be removed or spoiled for any reason.
Ref.1 - Spare plate Code 1079 9903 48
8.2 POSITION OF THE DATA PLATES (Fig. 4)
Ref. 2) “IN”
Ref. 4) Identification plate
Ref. 3) “OUT”
9.0 DRYERS ROOM
9.1 FLOOR
The floor must be even and of industrial type; the total weight of the machine is shown in Fig. 5
Remember the total weight of the machine when positioning it.
9.2 VENTILATION
The choice of an appropriate room will prolong the life of your dryer; the room must be spacious, dry, well ventilated and
free from dust.
The operating conditions to be complied with are the following:
Min. room temperature: + 5 °C (41 °F) (compulsory)
Min. inlet allowed temperature: +3 °C (37,4 °F)
Max. room temperature: + 45 °C (113 °F) (compulsory)
Max. inlet allowed temperature: 55 °C (131 °F)
Max. temperature of incoming air: 55 °C (131 °F)
Max. working pressure: 13 bar (188 °F)
10.0 TRANSPORT AND HANDLING
The machine must be transported as shown in the following figures.
11.0 UNPACKING
CUTTING THE METAL STRAPPING IS A DANGEROUS OPERATION, DO NOT ABANDON THE CUT PIECES IN THE ENVIRONMENT.
After removing the packing, ensure that the machine is unbroken and that there are no visibly damaged parts.
If you are in doubt, do not use the machine but apply to the manufacturer technical assistance service or to your dealer.
The packing material (plastic bags, polystyrene foam, nails, screws, wood, metal strapping, etc.) must not be left within
the reach of children or abandoned in the environment, as they are a potential source of danger and pollution.Dispose of
these materials in the approved collection centres.
FIG. 5
MODD.
NET
WEIGHT
Kg. (lb)
QPNC1600 380 (837)
QPNC1800 550 (1212)
QPNC2500 600 (1323)
QPNC3000 650 (1433)
FIG. 4
1
1079 9903 48
1
4
2
3
1
4
2
3

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12.0 INSTALLATION
12.1 POSITIONING
After unpacking the equipment and preparing the dryers room, put the machine into position, checking the following
items:
ensure that there is sufficient space around the machine to allow maintenance (see Fig. 6).
ENSURE THAT THE OPERATOR CAN SEE THE WHOLE MACHINE FROM THE CONTROL PANEL AND CHECK THE PRESENCE OF ANY
UNAUTHORIZED PERSONS IN THE VICINITY OF THE MACHINE.
12.2 ELECTRICAL CONNECTION
Check that the supply voltage is the same as the value indicated on the machine data plate.
Check the condition of the line leads and ensure that there is an efficient earth lead.
Ensure that there is an automatic cut-out device upstream for the machine against overcurrents, with a
differential device ( Ref. 1 Fig. 6 ), wiring diagram.
ONLY PROFESSIONALLY SKILLED PERSONNEL MAY HAVE ACCESS TO THE ELECTRIC PANEL. SWITCH OFF THE POWER BEFORE
OPENING THE DOOR OF THE ELECTRIC PANEL. COMPLIANCE WITH THE REGULATIONS IN FORCE CONCERNING ELECTRIC PLANTS
IS FUNDAMENTAL FOR OPERATOR SAFETY AND FOR THE PROTECTION OF THE MACHINE.
12.3 CONNECTION TO THE COMPRESSED AIR NETWORK
Fit a manual interception valve Ref. 1 between the machine and the compressed air network so that the dryer may be
isolated during maintenance operations (see figure 7 ).
Drainage of condensate Rif. 2 Fig. 7 (automatic) are led outside the machine with a flexible pipe that may be inspected.
Drainage must comply with the local regulations in force.
ALL DAMAGE DUE TO THE FAILURE TO COMPLY WITH THESE NDICATIONS CANNOT BE ATTRIBUTED TO THE MANUFACTURER AND
MAY CAUSE INVALIDITY OF THE GUARANTEE CONDITIONS.
12.4 STARTING UP
See part B of this manual, Chpter 18.0
1
FIG. 7
2
2
FIG. 6
1
ATTENTION:
THE DIFFERENTIAL AUTOMATIC SWITCH AGAINST
CURRENT OVERLOAD REF. 1 IS NOT CURRENT
SUPPLIED WITH THE MACHINE.
Minimum mt. 1,5 (in. 59)
PROTECT THE POWER CABLE WITH A SUITABLE
CHANNEL.

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13.0 DIMENSIONS AND TECHNICAL DATA (QPNC1600)
MODD.
WEIGHT
Kg. (lb)
Freon
R404A Kg. (lb)
Bar (psi)
MAX.
60 Hz
60 Hz
60 Hz
QPNC1600 380 (837) 6,600 (14,55) 9740 (13,06) 1250 (1,67) bar 13 (188)
Reference conditions:
Limit conditions:
V460-3-60
V460-3-60
Ambient temperature
38 °C (100 °F)
Max. ambient temperature
45 °C (113 °F)
Inlet air temperature
38 °C (100 °F)
Min. ambient temperature
5 °C (41 °F)
Working pressure
7 bar (101 psi)
Max. inlet air temperature
55 °C (131 °F)
Dew point in pressure
4 °C (39 °F)
Max. working pressure
13 bar (188 psi)
14.0 MACHINE ILLUSTRATION
14.1 GENERAL LAY-OUT (QPNC0750 - QPNC1000 - QPNC1250 - QPNC1600)
1
Refrigerant compressor
7
Freon filter
2
Condenser
8
Capillary
3
Motor fan
9
Pressure switch of motor fan
4
Evaporator
10
Pressure switch of the high pressure
5
Condensate drain
11
Liquid separator
6
Hot gas by pass valve
12
Pressure switch of the min. pressure
Nominal
Power
W (hp)
Nominal
Power
W (hp)
FIG. 8
8
4
6
7
5
1
11
9
10
3
12
2
(A) AIR INLET
(B) AIR OUTLET
ELECTRICAL CABLE
CONDENSATE
DRAINING
Refrigerant gas (1)
GWP 100 (2)
R-404A
3800
(1) According to ISO 817
(2) According to EN-378-1
MODD.
L
(mm / in)
W
(mm / in)
H
(mm / in)
QPNC1600 1020 (40,1) 1123 (44,2) 1551 (61)
MODD.
A
B
QPNC1600 FLANGED
" DN 125 "
FLANGED
" DN 125 "

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13.1 DIMENSIONS AND TECHNICAL DATA (QPNC1800 - QPNC2500 - QPNC3000)
MODD.
WEIGHT
Kg. (lb)
Freon
R404A Kg. (lb)
Bar (psi)
MAX.
60 Hz
60 Hz
60 Hz
QPNC1800
550 (1212)
10,500 (23,14)
9600 (11,28)
2500 (3,35)
13 (188)
QPNC2500
600 (1323)
11,000 (24,25)
12500 (16,7)
2500 (3,35)
13 (188)
QPNC3000
650 (1433)
15,0 (33,06)
17270 (23,1)
2400 (3,21)
13 (188)
Reference conditions:
Limit conditions:
V460-3-60
V460-3-60
Ambient temperature
38 °C (100 °F)
Max. ambient temperature
45 °C (113 °F)
Inlet air temperature
38 °C (100 °F)
Min. ambient temperature
5 °C (41 °F)
Working pressure
7 bar (101 psi)
Max. inlet air temperature
55 °C (131 °F)
Dew point in pressure
4 °C (39 °F)
Max. working pressure
13 bar (188 psi)
14.1 GENERAL LAY-OUT (QPNC1800 - QPNC2500 - QPNC3000)
Nominal
Power
W (hp)
Nominal
Power
W (hp)
1
Refrigerant compressor
7
Freon filter
2
Condenser
8
Capillary
3
Motor fan
9
Pressure switch of the high pressure
4
Evaporator
10
Pressure switch of the min. pressure
5
Condensate drain
11
Liquid separator
6
Hot gas by pass valve
12
Pressure switch of motor fan
1
9
10
12
11
5
7
8
4
FIG. 8a
3
2
6
MODD.
A
B
QPNC1800
FLANGED “DN 125”
FLANGED “DN 125”
QPNC2500
FLANGED “DN 125”
FLANGED “DN 125”
QPNC3000
FLANGED “DN 125”
FLANGED “DN 125”
(A) AIR INLET
INGRESSO
ARIA
(B) AIR OUTLET
ARIA
ELECTRICAL CABLE
CONDENSATE
DRAINING
Refrigerant gas (1)
GWP 100 (2)
R-404A
3800
(1) According to ISO 817
(2) According to EN-378-1
MODD.
L
(mm / in)
W
(mm / in)
H
(mm / in)
QPNC1800
1020 (40,1)
2099 (82,6)
1560 (61,4)
QPNC2500
1020 (40,1)
2099 (82,6)
1560 (61,4)
QPNC3000
1020 (40,1)
2099 (82,6)
1560 (61,4)

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14.2 COMMAND AND CONTROL PANEL
BEFORE CARRYING OUT THE OPERATION TEST, READ CAREFULLY AND ACQUIRE A GOOD KNOWLEDGE OF THE COMMAND
FUNCTIONS.
Ref. 1) Digital controller
Ref. 8) Stop - Running button - Door block
Ref. 9) Green indicator of voltage - Running
Ref. 10) Red indicator of alarm for:
- Condensate drain
Ref. 11) Red indicator of alarm for:
- High / Low pressure
- Fan motor protection
ICON
MODE
FUNCTIONS
ALARM
OFF
No active alarms
ON
Probe failure alarm
High/Low temperature alarm
COMPRESSOR
OFF
Dryer off
FLASH
Maintenance warning
ON
Dryer on
FAN
OFF
Fan off
FLASH
n/a
ON
Fan on
2
Alarms
3
Power ON
4
Fan ON
5
PDP temperature
6
Unit °C or °F
7
Alarms led
FIG. 9
1
8
9
10
11
1
5
6
4
3
2
7

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15.0 PARTIAL ROUTINE MAINTENANCE
BEFORE CARRYING OUT ANY MAINTENANCE JOBS IT IS OBLIGATORY TO STOP THE MACHINE AND DISCONNECT IT FROM THE
POWER MAINS AND FROM THE COMPRESSED AIR DISTRIBUTION NETWORK.
15.1 MAINTENANCE SCHEDULE
These maintenance intervals are recommended for work environments that are not dusty and are will ventilated. For
particularly dusty environments, double the frequency of controls.
Each Week
Condensate drain: Clean the filter of the steam trap
Each Monthly
Condenser: Clean the condenser fins to remove eventual dust.
15.2 CLEANING OF THE AUTOMATIC CONDENSWATER DISCARGER FILTER (Fig. 10)
Clean the filter of the steam trap.
Proceed as follows:
- Close the cock Ref. 1 Fig. 10
- Remove the panel Ref. 5 Fig. 10
-Release the pressure in the dryer by pressing the condensate drain “TEST” pushbutton locate on the steam trap
Ref. 2 Fig. 10.
- Switch off the machine. Turn the switch in position STOP Ref. 3 Fig. 10
- Turn on the supply automatic differential switch Ref. 4 Fig. 10
HOT PARTS INSIDE
- Remove the stopper Ref. 6
- Remove the filter Ref. 7
- Clean the filter Ref. 7 with a jet of air, working from inside to outside
- Install the filter, fix the plug Ref. 7 - 6
- Close the panel Ref. 5
15.3 CLEANING THE CONDENSER (Fig. 10)
The condenser must be cleaned every month.
Proceed as follows:
- Switch off the machine. Turn the switch in position STOP Ref. 3 Fig. 10
- Turn on the supply automatic differential switch Ref. 4 Fig. 10
- Remove the panel Ref. 8 Fig. 10
- Clean the condenser fins Ref. 1 with compressed air (Fig. 10) DO NOT USE WATER OR SOLVENTS
- Close the panel Ref. 8 Fig. 10
FIG. 10
2
6
7
3
8
4
5
1

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16.0 SCRAPPING THE UNIT
If the machine is to be scrapped, it must be dismantled into parts of the same material, to be disposed of according to the
local regulations in force.
ALWAYS RESPECT THE REGULATIONS IN FORCE FOR DISPOSING OF OLD OIL AND OTHER POLLUTING MATERIALS SUCH AS
INSULATING FOAM, ETC.
17.0 TROUBLE-SHOOTING AND EMERGENCY REMEDIES
ALL WORK MUST BE CARRIED OUT BY PROFESSIONALLY SKILLED PERSONNEL. BEFORE CARRYING OUT ANY MAINTENANCE
JOBS IT IS OBLIGATORY TO STOP THE MACHINE AND DISCONNECT IT FROM THE POWER MAINS.
N.B. OPERATIONS MARKED MUST BE CARRIED OUT BY PROFESSIONALLY SKILLED PERSONNEL APPROVED THE
MANUFACTURER
FAULT FOUND
POSSIBLE CAUSES
OBSERVATIONS
1) No compressed air passes through the dryer
outlet
1A) The pipes are frozen inside
 -The bypass valve of the hot gas is broken or
out-of-calibration
-The room temperature is too low and the
evaporators piping are obstructed with ice
2) Presence of condensate in the pipings.
2A) The condensate separator does not work
correctly
2B) The dryer is working outside its rating
2C) The dryer is working under bad conditions of
condensation
-Clean the filter from the condensate drain
-Check the condensate drain
-Check the flow rate of treated air
-Check the room temperature
-Check the air temperature at the drier inlet.
-Clean the condenser.
-Check the operation and the calibration of the
press. switch
-Check the good operation of the fan.
3) The compressor head is very hot
(> 55 °C –131 °F).
Make reference to 2B
Make reference to 2C
3A) The cooling circuit is not working with the right
gas charge
 -Check if there are leaks of refrigerating gas.
 - Charge it again.
4) Motor cuts out on overload
Make reference to 2B
Make reference to 2C
Make reference to 3A
5) The motor hums and does not start.
The line voltage is too low.
You switched the machine off and on again
without leaving enough time for the pressure
balancing.
The starting system of the motor is defective.
-Contact the electric power company
-Wait a few minutes before starting the machine
again.
 -Check the running and starting relays and
condensers (if any)
6) The machine has stopped and does not restart
even after a few minutes.
The termostatic protection with manual reset
has intervened: make reference to 2B-2C-3A.
The motor has burnt out.
7) The compressor is very noisy.
Troubles with the internal mechanical parts or
with the valves

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17.1 TROUBLE-SHOOTING AND EMERGENCY REMEDIES
N.B. OPERATIONS MARKED MUST BE CARRIED OUT BY PROFESSIONALLY SKILLED PERSONNEL APPROVED THE
MANUFACTURER
DISPLAY
FLASHING WARNING
NOTES
Possible root causes
Observations
Dryer is working OK
n/a
Warning icon NOT
fashing, label P1 flashing
Fan control probe failed
 replace probe
Warning icon NOT
fashing, label H1 flashing
High PDP call for service
 refrigerant leak
 flow rate / inlet
 temperature
exeeding the limit.
Warning icon NOT
fashing, label L1 flashing
Low PDP call for service
 hot gas by pass
valve out of order.
 ambient temperature
lower then limits
EE ALARM
EE alarm is shown when internal EPROM errors happens, if this warning will appear, the dryer will stop running. The error can be reset by pressing
one of the four buttons of the controller, anyway please replace the controller itself.
NOTE: In case of EE alarm please contact your tech support.

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SE ALARM
After 4000Hrs, the controller will issue a “SE” warning. This is the maintenance due warning.
How to reset the maintenance warning: follow steps 1 to 6
1
2
3
4
5
6

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PART “B”
THIS PART “B” OF THE INSTRUCTIONS MANUAL IS RESERVED FOR
PROFESSIONALLY SKILLED PERSONNEL APPROVED THE MANUFACTURER.
18.0 STARTING UP
BEFORE CARRYING OUT ANYOPERATION ON THE MACHINE, ENSURE THAT THE ELECTRIC POWER SUPPLY HAS
BEEN DISCONNECTED
WAIT AT LEAST TWO HOURS BEFORE STARTING UP, AFTER ANY MACHINE MOVEMENT (TRANSPORT OR
HANDLING).
18.1 PRELIMINARY CONTROLS
Before starting the dryer, check:
- The correct connection to the compressed air piping: remember to remove eventual caps on the drier inlet and outlet.
- The correct connection to the condensate drainage system.
- That the power supply is right.
18.2 STARTING AND STOP
Start the system before the air compressor starts running and stop it after the air compressor has been stopped. The
compressed air piping will be free of condensate only by doing so. The drier must be kept running during all the time the
air compressor is running. WARNING: if the drier is switched off, before starting it again, wait at least 5 minutes in order
to allow the pressure balancing.
BEFORE CARRYING OUT ANY MAINTENANCE JOBS IT IS OBLIGATORY TO STOP THE MACHINE AND DISCONNECT IT FROM THE
POWER MAINS AND FROM THE COMPRESSED AIR DISTRIBUTION NETWORK.
PRESSURE DISCHARGE PROCEDURE
Proceed as follows:
- Close the cock Ref. 1 Fig. 11
- Remove the panel Ref. 2 Fig. 11
-Release the pressure in the dryer by pressing the condensate drain “TEST” pushbutton locate on the steam trap
Ref. 3 Fig. 11
- Switch off the machine. Turn the switch in position STOP Ref. 4 Fig. 11
- Turn on the supply automatic differential switch Ref. 5 Fig. 11
- Close the panel Ref. 2 Fig. 11
FIG. 11
3
4
2
5
1

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CALIBRATIONS
BYPASS VALVE FOR HOT GAS
N.B.These valves have already been calibrated and they do not require any adjistment. A dew point different from the
rated one generally depends on causes which are not attributable to their operation.
Ref. 1) Closing cap
Ref. 2) Adiusting screw
WORKING PRESSURES AND TEMPERATURES OF R404A
SUCTION SIDE OF
REFRIGERATION COMPRESSOR
Evaporat.
Temperat.
°C (°F)
Evaporating
Pressure bar (psi)
RATED VALUES
(Temperat.
20°C –68°F)
2 ÷ 3
(35,6 ÷ 37,4)
R404A
5,4 ÷ 5,6
(78,3÷ 81,2)
1
2