Demargo DM240NF User guide

Instructions for installation and operation
Compressed air refrigeration dryer
21.10. 20
DM240NF Refrigerated Compressed Air Dryer
MODELS:

REFRIGERATED COMPRESSED AIR DRYER
Contents Preface
We’d like to give our thanks hereof for your choosing
our Refrigerated Compressed Air Dryer as well as your
trust and support.
We sincerely hope it will make a great contribution to
your production.
Please read this instruction manual before operation.
In this way to ensure that you are able to control the
machine, which will run steadily and safety.
This manual is to introduce installation, operating,
running, maintenance, wiring chart and troubleshooting
etc. Please pay attention to the technical data and
comprehend the parts’function of the flow as well as
their operation condition to the whole system before
operating.
This purpose is to let the user master the general
knowledge during the dryer’s running and maintenance
to ensure its running smoothly.
Please feel free to contact us if there’s any question.
Safety warning signs
Danger!
Supply voltage!
Contact with non-insulated parts carrying supply voltage involves the
risk of an electric shock resulting in injuries and death.
Only qualified and skilled personnel are authorised to run
electrically-operated devices.
Prior to undertaking maintenance measures at the device, the following
requirements must be met:
Make sure that the power supply is switched off and that the device is off
and marked for maintenance measures. Please also ensure that the power
supply cannot be re-established during the works.
PREFACE..................................................................1
SAFETY WARNING SIGNS.......................................1
WARNING................................................................3
NOTICE OF INSTALLATION....................................3
AN INTRODUCTION TO THE CONTROLLER.........4
PARTS NAME ...........................................................5
METHODS OF OPERATION.....................................6
ABOUT PRESSURE GAUGE......................................6
ABOUT POWER SUPPLY..........................................6
MAIN TENANCE TO THE DRYER.............................7
MAIN TECHNICAL DATA OF THE DRYER..............7
NOTICE....................................................................10
TROUBLESHOOTING.............................................. .10
APPENDIX................................................................13
SUMMARY................................................................13
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REFRIGERATED COMPRESSED AIR DRYER
Caution!
Hot surfaces!
During operation, several components can reach surface temperatures
of more than 140°F. There is the risk of burns.
All components concerned are installed inside of the closed housing.
The housing must only be opened by certified skilled personnel 3 .
Beware of mechanical injury
Caution!
Avoid mechanical injury accidents!
Extrusion, collision, impact, shearing,
entanglement, twisting, throwing, cutting, cutting, puncturing, etc.
Caused by mechanical equipment movement (stationary), parts, tools,
and processed parts directly contacting the human body.
Warning
●It's prohibit to invert, shake, quiver and heavy break during
transportation, sling and installation.
●Please operate the dryer strictly according to the ambient
temperature and working conditions stipulated in this manual.
●Please maintain it timely. It will short the dryer's life due to the
exceeding of working conditions for a long time.
●Check and make maintenance timely will extend it's using life,
please appoint professional people to manage it.
Notice of installation
●Install on the balanced, fastness floor. It's prohibited to place on the
floor with heavy shock, slant, bumpiness and badness of drainage.
●Install in the breezy place, and the ambient temperature
0
can't extend 45 C.
●It's also prohibited to place in the open air, humid, dust and erode gas
existence.
●The radiators can't be opposite when there're many dryers placed together.
19.7 in
19.7 in
19.7 in
Air convection
The ambient temperature is below 113°F
Compressedairoutlet
Compressedairinlet
Bypassvalve
Intakevalve
Interface
Outletvalve
Controloperationpanel
Wheninuse,
thebypassvalveisusuallyclosed,
andtheinletandoutletvalvesof
theairdryerareopened.
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REFRIGERATED COMPRESSED AIR DRYER
●Please use the linker to connect AIR INLET and AIR OUTLET.
●Please make sure you've configured by-pass pipeline in order to maintain.
●The weight of pipeline shouldn't be too much, and caution that you can't
overexert when install the pipeline.
●Please whiff and clean the inner pipe thoroughly before installing it so as to
avoid dust.
●Please also be noticed that the shaking of compressor can't be passed to the dryer.
An introduction to the controller
POWER SUPPLY
---- The power indicator, , it's lighting during electrifyingRED
OPERATION
----The operation indicator, , it's lighting if the dryer run smoothly.GREEN
HIGH FAULT
----The high pressure fault indicator, , it's lighting when high ORANGE
pressure exceeds, the dryer will stop automatically when it lights, and
the light will extinguish when it comes to balance with the low pressure.
LOW FAULT
---- The low pressure fault indicator, , it's lighting when low ORANGE
pressure exceeds, the dryer will stop automatically when it lights,
and the light will extinguish when it comes to balance with the high pressure.
ELEC FAULT
---- The electrical fault indicator, , it's lighting when the ORANGE
electric system has a fault, the dryer will stop automatically when
it lights.
ON
---- Start button, , the start interval should at least last GREEN
for 3 minutes.
OFF
---- Stop button, .RED
Parts name
Compressedairoutlet
Compressedairinlet
Filter
Aftercooler
Highvoltagecircuitbreaker
Coolingfan
Operationcontrolpanel
Coldcoalevaporator
Waterseparator
Condenserfan
Coldcoalcompressor
Distributionbox
Automaticdrainage
Highandlowvoltage
controlswitch
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REFRIGERATED COMPRESSED AIR DRYER
Methods of operation
◆ Check and make sure the dryer is installed correctly, you can
go on preliminary operation, pressure the “ON” button to start.
◆ The “OPERATION” indicator will light and according to the
ambient temperature, the fan and motor inside will run and stop
reduplicative. If the evaporating pressure gauge exceeds 7kg
under the continuous running of the fan, it may be overload.
◆ Press the “OFF” button to stop.
◆ The auto-drain/electric drain will drain out after a period of time.
◆ When the button lights, there're some faults of the dryer, orange
it will stop automatically. Please restart after the clearance faults.
About pressure gauge
◆Evaporating pressure gauge, evaporating temperature shows the pressure
of low-pressure refrigerant. The index should between 4~6kg of normal
load. And it'll be a bit lower if non-loaded.
◆Air pressure gauge, shows the compressed air pressure of the surrounding
air outlet.
About power supply
◆ Please use 220V or 380V special interface.
◆Please be sure you've installed the leakage protector.
◆ You're required to make the earth wire before connecting the power supply.
Maintenance to the dryer
1. Unload the auto-drain to clean monthly, but it's not necessary if it's
electric drain.Open the by-pass valve; close the inlet & outlet valve
before unloading the drain to lessen the pressure inside auto-drain to zero.
Unscrew the lower shell with pipe pliers; infuse some neutral abluent to
clean it. It absolutely prohibited by using menstruum.
After that, please re-install to the home position, locking with the O-ring.
Close the by-pass valve than open the inlet valve.
2. Clean the radiator-grid weekly with aspirator, brush or air gun etc.
3. You can use the air gun only to clean the electric switch box and
circuit board.
Main technical data of the dryer
1. Air-cooling refrigerated air dryer 2. Water-cooling refrigerated air dryer
Inlet temperature: Inlet temperature:
Normal temp.:≤ High temp.:≤ Normal temp.:≤ High temp.:≤ 113°F 176°F 113°F 176°F
Cooling method: Air cooling Cooling method: water cooling
Ambient temperature: ≤ Dew point: 100°F 35.6-50℉
Dew point: Refrigerant: R2235.6-50℉
Refrigerant: R22 Inlet pressure: 0.6~1.0Mpa
Inlet pressure: 0.6~1.0Mpa Pressure drop: ≤0.02Mpa
Pressure drop: ≤0.02Mpa Cooling water inlet temperature: ≤ 89.6°F
Cooling water inlet pressure: 0.2~1.4Mpa
Dedicated line 220V-380V
Set up leakage terminal circuit breaker
Ground wire
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REFRIGERATED COMPRESSED AIR DRYER
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2
3
5
6
8
7
4
9
Pressure controller
Compressor
Dry filter
Capacitance
Controller
Cold coal low
pressure meter
Fan
President of
Heat Exchanger
Electronic drain
10 Ball valve
11 Condenser
123
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5
6
7
8
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DM240NF series refrigerated air dryer
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Product Information Technical Details
Brand：
Model：
Max air volume：
Pressure dew point：
Working pressure：
The largest Working pressure：
Inlet temperature:
Ambient temperature:
Working hours：
way to control：
Pressure loss：
Drain valve：
Cooling method：
Refrigerant model：
Power supply：
Air pipe connection：
Air inlet and outlet pipe size：
Dimensions (L × W × H) ：
Installation method：
Demargo
DM240NF
141CFM
35.6-50℉
87Psi
145Psi
< 113℉
≤100℉
Continuously working
Microcomputer control
≤2.9Psi
Electronic drain valve
Air-cooled
R134a
220V1ph 60HZ
0. KW66 / 0.88HP
0.18HP
NPT Threaded connection
1.5 （internalthread）DN40''
34.6''-18.7''-31.9''
Simple and convenient
Fan Power：
Compressor power：

REFRIGERATED COMPRESSED AIR DRYER
Notice
1. Note:
If the evaporating pressure gauge exceeds 7KG during working,
it may be over-loaded, please check the over-loaded conditions
as bellows.
2. Loading conditions:
It will go to over loaded under the following conditions and run
constrainedly. Then it will stop running when the protector “orange”
indicators light.
1). Compressed air temperature is excessive.
2). Compressed air capacity is exceeded.
3). Ambient temperature is higher than 13 .1℉
4). Voltage under 198V (220V rated) or under 340V (380V rated).
5). Badness of thermolysis.
3. Attention:
The auto-drain may not act as there's some impurity contained in the
compressed air, please check if there's condensate water coming out
from the draining hole everyday. According to the characteristic and
structure of drain, it may drain out from the draining hole provide the
2
pressure is under 1.5kg/cm . Therefore, the pressure may not be raised
if gas production of air compressor is too small. Please pay attention to it.
Troubleshooting
Familiar faults caused by the refrigerated air dryer itself and external
factors conditions as well as its trouble-shooting as follows:
Pressure drop is excessive
phenomena
Causation
Troubleshooting
The differential pressure is too
large of the whole air compression
station
The piping valves don’t be fully opened.
Open the valve fully.
The pipe(s) is too slim.
Enlarge the pipe(s).
Pipeline is too long, lots of elbow and
tie-in.
Re-configurate the piping system.
Much leakage of the piping
connections.
Check the elbows and connections.
Block of the piping filters.
Clean the filters or change new
one(s).
Shortage of the air using
Actual using capacity exceeds the
compressor rated capacity.
Change larger compressor, or
increase pressure.
Fall physically
Decrease air flowrate.
Ice over of the evaporator
Fault of temperature switch.
Renew temperature switch.
Invalidation of expansion valve.
Renew expansion valve.
Badness of draining
phenomena
Causation
Troubleshooting
Liquid water content
The air by-pass valve doesn’t be fully
closed.
Close the by-pass valve.
Compressed air doesn’t go through the
dryer.
Open the inlet and outlet valves of
dryer.
The flowrate is too much.
Re-design the compressor system.
Badness of the drain.
Clean or change.
The drainpipe is higher than the auto-
drain.
Re-setting the drainpipe.
Compressor is too large, while the dryer
is too small.
Re-setup the compressor and dryer.
Abnormity of the evaporating
gauge.
Evaporating temperature is too high.
Check the air load of compressor.
The ambient air pollution or badness of
ventilation.
Improve the ventilation and ambient
conditions.
Block of the expansion valve.
Change the expansion valve.
Leakage of refrigerant.
Check the leakage, and infuse
some refrigerant.
Spoiling of the gauge.
Change the gauge.
Out of operation
phenomena
Causation
Troubleshooting
Out of power supply.
The fuse blew out or trip of the fuse
disconnecting switch.
Check if the power lack of phase or
short circuit.
Check the fuse.
Power supply is in normal, but it
can’t start.
Power-off.
Check and maintain.
Abnormity of voltage or too slim of the
power cord. (voltage drop)
Please choose voltage according to
the rated on the name plate.
Badness of switch.
Change.
badness of contactor
Change.
Badness of overload relay.
Change.
Badness of electric capacity.
Change capacitor.
Badness of start relay.
Change.
Badness of pressure switches.
Change.
Badness of temperature switches.
Change.
Badness of refrigerated compressor.
Change.
All switches in normal, but it can’t
start.
Trips of high-low pressure and desn’t go
to restoration.
Check the reason of trips, press
“RESET”.
Electromagnetic switch doesn’t go to
restoration.
Check and pressure “RESET”.
High pressure switch doesn’t go to
restoration.
Check and pressure “RESET”.
Setting error of the temperature switches.
Reset or change.
Badness of refrigerated compressor.
Change.
Evaporating temperature
indicator too lower.
Evaporating temperature (badness of low
pressure gauge).
Change.
Block of the expansion valve.
Change.
Setting lower of the temperature and
pressure switches.
Please adjust the setting.
Leakage of refrigerant.
Check the leakage points, and
infuse some refrigerant.
Evaporating temperature
indicator too higher.
Ambient temperature is too high.
Improve the ambient temperature or
change place for ventilation.
Invalidity of the thermal by-pass valve.
Adjust or change.
Block of the condenser.
Clean.
The capacity is too much.
Reposition of the matching.
Abrasion of the valve flap of refrigerant
compressor.
Change.
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REFRIGERATED COMPRESSED AIR DRYER
Badness of drainage system
phenomena
Causation
Troubleshooting
Badness of drainage.
The using pressure is under1.5kg/cm 2.
Normal pressure should be 2~10
kg/cm2.
Spoiling of ball valve.
Change.
Slant or disrepair of the valve.
Improve, fasten or change.
Pressure is too high.
Please use according to the rated
pressure.
Block of the filtering of drain.
Clean.
Block of the waterspout.
Clean.
Badness after starting
phenomena
Causation
Troubleshooting
Abnormity of voltage.
After starting, it’s short circuit.
Reposition of the control circuitry
and switches.
Thought the high pressure
trip is restoration, it’s can’t
start.
Badness of pressure switch.
Change.
Badness of fan.
Change.
Trip of the overload protector.
Check the reasons.
Begrime of the condenser.
Clean it thoroughly.
Excessive of refrigerant.
Less some refrigerant.
The ambient temperature is too high.
Improve the ambient temperature
and ventilation.
Block or closed of expansion valve.
Change.
Trip of the carrying relay.
Block of refrigerant filter.
Change.
Badness of start relay.
Change.
Badness of capacitor.
Change capacitor.
Badness of pressure switch.
Change.
Refrigerated compressor is overloaded.
Decrease air capacity.
The ambient temperature is too high.
Improve the ambient temperature
and ventilation.
The relay rated electric current is too low.
Adjust the rate.
Badness of relay connection.
Clean or renew.
Lack phase of power supply.
Check the reasons.
Badness of connector.
Clean or renew.
Appendix:
Guarantee card
Thank you for choosing Demargo refrigerated compressed air dryer.
The dryer is manufactured by holding abundant experience and mature
technology, it's the advanced product. We ensure one year guarantee
from your buying date.
We will answer your questions timely and carefully.
File card （in duplicate）
Customer name:
Contact person:
Telephone No.:
Fax No.:
Address:
Buying date:
Model No.:
Serial No.:
Installation place:
Customer name:
Contact person:
Telephone No.:
Fax No.:
Address:
Buying date:
Model No.:
Serial No.:
Installation place:
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