Compressed Air Advisors mikropor MH-US Series User manual

COMPRESSED AIR DRYERS
MH-US SERIES (MH-US-10 to MH-US-100)
INSTRUCTION
MANUAL
WARRANTY NOTICE
Failure to follow the instructions and
procedures in this manual or misuse of this
equipment will VOID its warranty !

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Page 3
TABLE OF CONTENTS
1. IMPORTANT SAFETY NOTES - Please read ........ 6
1.1. Transportation ............................................................. 6
1.2 Positioning ................................................................... 6
1.3 Installation .................................................................... 6
1.4 Before operating ........................................................ 6
1.5 Qualified service personnel .................................... 7
1.6 Maintenance by the user ......................................... 7
2. INTRODUCTION TO THE MHUS DRYER ............ 7
3. OPERATION .................................................................. 11
4. ELECTRICAL CONTROLLER ................................... 13
4.1 Digi-Pro ......................................................................... 13
5. TECHNICAL SPECIFICATIONS................................. 16
6. DIAGRAMS..................................................................... 17
6.1 Air Flow Diagrams....................................................... 18
6.2 Electrical Diagrams..................................................... 24
6.3 Electrical Diagrams..................................................... 26
7. GENERAL ARRANGEMENTS..................................... 34
8. EXPLODED DIAGRAMS ............................................. 34
9. COMPONENTS LOCATION ..................................... 48
10. TROUBLESHOOTING ................................................ 49
11. WARRANTY .................................................................. 51

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Manufacturer Mikropor Filters
I.OSB Büyük Selçuklu Caddesi, No:4 06935 Ankara/Tur-
key
Phone: [phone]
Fax: [phone]
Product Description
Serial No of Set (device)
Type of Product
Module
Air Dryer
MH-US-15, MH-US-25, MH-US-35, MH-US-50, MH-US-75
MH-US-100
0118MA00001 to 5218MA99999
CAT II Air Dryer
Module A2
Assesment Modele
Confirmed By
TÜV Austria Service GMBH
Kind of inspection certification supplied stan-
dards
Certificate No:
Modules for compatibility assesment of pres-
sure in-build elements;
Exchanger
Receiver
Separator
Compressor
Module A2 type compatibility
Notified Body No 0408
Addres; Deutschstreasse 10 1230 Wien/Österreich
PED (2014/68/EU) Certification EN378-2
ZSTS / SWZE / 1790
CAT II MODUL A2
CAT I MODUL A2
CAT I MODUL A2
CAT I MODUL A2
Product Responsibility Mikropor Filter is responsible for product in conditions it
was delivered. Any modifications are forbidden.
Product be operated according to its application. In case
of breaking above conditions realized manufacturer from
responsibility for the product CE mark of the product will
be not valid.
Signature
Local Quality Manager, Pressure Vessel Ahmet Emin ÇAMLIBEL
Date; 29.03.2017
Declaration of Conformity
PED 2014/68/EU
(NB No : 0408)

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EC DECLARATION OF CONFORMITY
MANUFACTURER
NAME :MİKROPOR MAK. SAN. VE TİC. A.Ş.
ADDRESS :Organize Sanayi Bölgesi Büyük Selçuklu Bulvarı No. 4, 06935, Ankara - Türkiye
TEL :[phone] FAX: [phone] WEB: www.mikropor.com.tr
Name and Address of the
Person authorised to compile the technical file : Ahmet Emin ÇAMLIBEL
Organize Sanayi Bölgesi Büyük Selçuklu
Bulvarı No. 4, 06935, Ankara -Türkiye
The undersigned declares that the described products meet the essential requirements of the below
mentioned standards as based on Machinery Directive 2006/42/EC, Low Voltage Directive 2014/35/
EU, Electromagnetic Compatibility Directive 2014/30/EU
The item of equipments which identified below has been subject to internal manufacturing checks
with monitoring of the final assesment by Mikropor
MACHINE DESCRIPTION MODELS : Air Dryer
MH-US-15, MH-US-25, MH-US-35, MH-US-50, MH-US-75, MH-US-100
Serial No of Set (device): 0118MA00001 to 5218MA99999
APPLICABLE DIRECTIVES :
2006/42/EC MACHINE SAFETY DIRECTIVE
2014/35/EU LOW VOLTAGE DIRECTIVE
2014/30/EU ELECTROMAGNETIC COMPATIBILITY DIRECTIVE
Certificate No: 16-PS-0279-TAT-16-MAD-1059
APPLICABLE REGULATIONS :
EN ISO 12100:2010; EN 60204-1:2006/AC:2010; EN 61000-6-2:2005; EN 61000-6-4:2007+A1:2011
EN 378-2
SIGNED ON BE HALF OF THE MANUFACTURER
NAME : Mustafa Uslu
POSITION : R&D Manager
PLACE/ DATE : ANKARA / 03.04.2017
SIGNATURE :

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I. IMPORTANT SAFETY NOTES Please READ
When operating the air dryer the operator must apply safe working methods and observe all local
safety instructions and relevant regulations.
A Prior to installation, the dryer and the compressed air system are to be depressurized and
disconnected from the electrical main supply.
B The user is responsible for safe operating conditions. Parts and accessories must be replaced if
inspection shows that safe operation cannot be assured.
C Installation, operation, maintenance and repair are only to be authorized, trained and skilled
engineers.
D The minimum and maximum values stated must be observed, as well as all of the safety precautions
described in this manual.
E If any statement in this manual does not comply with the local legislation, the strongest standard is to be
applied.
1.1. Transportation
A Use care and caution when transporting the dryer. Avoid dropping and other physical abuse.
B A forklift can be used to transport the dryers provided the forks are long enough to support its full width
or length and caution is used throughout the move.
1.2. Positioning
A The dryer must be installed horizontally. A minimum of 19.6 in. clearance around the dryer is necessary
to allow a good ventilation and easy access for servicing.
B The ambient temperature in the room should not exceed 113°F and should not be below 39.2°F, taking
the heat radiated by the dryer into account.
C (40 watt for each liter/sec under ISO 7183-A condition or 18 watts for each SCFM under ISO 7183-B
condition).
D There should be no chemicals in the atmosphere that will damage the copper source. (Ammonia gas
etc.)
1.3. Installation
In addition to the general mechanical construction procedures and local regulations, the following
instructions need to be emphasized:
1 Only authorized, trained and skilled engineers should install the compressed air dryer.
2 Safety devices, protecting covers or insulation in the dryers never to be dismantled or modified.
Each pressure vessel or accessory installed outside the dryer with air above atmospheric pressure must be
fitted with the required pressure relief safety valves.
1.4. Before Operating
The following points must be observed before operating the air dryer:
A Review all safety precautions.
B The dryer connection piping measurements must be selected correctly. (See Technical specifications)
C The dryer connection piping must be adapted to the operating pressure. (See Technical specifications)
D Never operate the dryer at pressure above the maximum specified on the dryer label (check the
technical specs too).
E The drains should be opened to atmosphere. If the drains are connected to a pipe / hose, the diameter
of the hose / pipe should be large enough to create no back pressure during drain. It is not recommended
to reduce the diameter of the hose / pipe less than port that is given at the drain outlet of the unit.
The hose / pipe should be at atmospheric pressure at all time. Back pressure in relevant pipe will result in
permanent damage on drain system and the aect function of the filters and / or dryers.

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1.5. Qualified service personnel
A Maintenance and repairs should only be performed when the air dryer is shut down and depressurized
and when the main power switch is turned o.
B Use only the appropriate tools for maintenance and repair.
C Before dismantling a part under pressure, disconnect the pressure sources and depressurize the
system.
D Proceed carefully during maintenance and repair. Prevent dirt from entering by covering parts and
orifices with a clean cloth, paper or tape. A receiver should never be welded or modified in any way.
E Never leave tools, loose parts or cleaning rags in or on the air dryer.
F Before returning the dryer into service, check the setting of the control and safety devices as well as the
pressure and the temperature of the compressed air circuit.
1.6. Maintenance by the user
A Keep the dryer clean.
B Regularly check the correct operation of the condensate drain trap.
C Every six months, check and clean the drain strainer by undoing the access screw and rinsing the filter
with tap water to remove the trapped dirt from the inside.
D For aircooled dryers, clean the air condenser as soon as it’s dirty or clogged.
E For optional water-cooled condensers, use only clean water andinstall a water filter if needed. Use
water counter flow to clean condenser if need.
F Check the trouble-shooting list in case of maintenance troubles.
G Check operating pressures, temperatures and time settings after maintenance. If operating and safety
devices function properly, the air dryer may be used.
2. INTRODUCTION TO THE DRYER
A) Manufacturer:
MiKROPOR / www.mikropor.com
B) Purpose of this dryer
1 This refrigerated compressed air dryer has been designed to remove water vapor from industrial
compressed air.
2 This dryer has been designed for indoor operation.
3 The minimum and maximum values stated must be observed, as well as the safety precautions
described in this manual.

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C) Dryer label
The following label is axed on the cabinet of the refrigerant compressed air dryer.
D) Working details
1) Refrigerant circuit:
The refrigerant circuit can be divided in 3parts:
A Low pressure section with an evaporator (heat exchanger)
B High-pressure section including: Condenser, liquid receiver, (if installed) and the filter dryer.
C Control circuit including: Compressor, Expansion valve, by-pass valve (if installed),
Fan pressure switch (if installed)
2) The Refrigerant circuit operates as follows:
A The compressor compresses gaseous refrigerant to a high temperature.
B The hot refrigerant condenses in the condenser. Being liquefied it is stored in the liquid receiver (if installed).
C The liquid is taken out the storage vessel and injected in the evaporator (heat exchanger) by an expansion valve.
This expansion valve is protected by a filter, which removes particles and humidity that could be in the circuit.
D The injected liquid fills in the refrigerant section of the air / refrigerant heat exchanger and evaporates by taking
out the calories from the compressed air. The gaseous refrigerant is sucked in the compressor and the cycle carries
on.
E In order to keep the evaporation pressure steady, and thus the refrigerant temperature in the heat
exchanger, a by-pass valve is injecting hot gaseous refrigerant in the circuit. On certain dryers, an
automatic expansion valve regulates this.
3) Compressed air circuit:
A The saturated hot compressed air flows into the Economiserwhere it is pre-cooled by the out flowing dry chilled
air. In the cold zone of the air refrigerant section it continues to cool down to dew point and enters the separator
where condensates are collected. The outgoing chilled air is then warmed up in the economizer by the hot
incoming air.
Dryer label describtions
Model No: Dryer model no
Serial No: Dryer serial no
Max Refrigerant Pressure: Dryer maximum working pressure
Max. Air Pressure: Maximum air pressure
Max. Air Inlet Temp: Maximum air inlet temperature
Min. Ambient Temp. : Minimum ambient temperature
Max. Ambient Temp. : Maximum ambient temperature
Min. Circuit Ampacity : Maximum allowed amount of current
Max Protective Device Rating : Maximum protective device rating
Voltage : Main supply voltage
IP Rating : Protection rating
Refrigerant 134a : Amount of refrigerant gas used
Weight : Dryer weight
Fan : Model of fan used
Compressor : Model of compressor used
Mikropor America Inc.
251 N.Roeske Avenue Michigan City, IN 46360
www.mikroporamerica.com MODEL NO: MH-US
SERIAL NO:
MH-US
Max. Refrigerant Pressure
Max. Air Pressure
Max. Air Inlet Temp.
Min. Ambient Temp.
Max. Ambient Temp.
Min. Circuit Ampacity
Max. Protective Device Rating
Voltage
P Rating
Refrigerant R134a
Weight
Fan
Compressor

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B The condensates are collected after centrifugal separation and drained out through the automatic trap.
C As long as the compressed air temperature does not drop below dew point, there will be no
condensation in the air circuit.
4) Refrigerant compressor
Increases the pressure and temperature of refrigerant. There is one type of compressor commonly used
according to refrigerant capacity on this application which is Piston Type.
5) Condenser
Dissipates the heat provided by evaporator and compressor.
There is one type of condenser used on the application:
- Air Cooled Type (standard)
These condensers are designed to dissipate the heat to the ambient air.
The fans are used to force the air flow through the fins to enhance the heat transfer.
6) Refrigerant circuit protection
A Klixon: The single phase compressors are equipped with a klixon which is a thermal sensitive switch
controlling the temperature of the compressor and possible overintensity.
In case of malfunction, the klixon trips but switches on again automatically as soon as the compressor has
cooled down.
B High Pressure Security Switch: Refrigerant line is considered as a pressure vessel. That is why it is
protected against bursts by the help of manually reset switch. It is set to 362 psi for dryers working with R134a
C Filter dryer: A refrigerant circuit is a closed circuit and total water removal in the refrigerant circuit is
paramount in order to obtain a correct functioning.
D To avoid problems, the refrigerant circuit must be vacuumed before loading the refrigerant.
It is equipped with a filter dryer, which also traps any solid particles, which may have migrated into the circuit during
assembly.
E Water-cooled dryers have a safety high-pressure switch.
In case of cooling water failure, the safety switch stops the dryer. When the safety switch has tripped out,
it has to be manually resettled before switching on the dryer.
Compressed
Dry Air Outlet
Compressed
Dry Air Inlet
A
C
B
D
E
F G
H
I
LA-COMPRESSOR
B-FAN MOTOR
C-CONDENSER
D-HIGH PRESSURE SWITCH
E-FAN SWITCH
F-FILTER DRIER
G-EXPANSION VALVE
H-CHECK VALVE
I-SOLENOID VALVE
J-HEAT EXCHANGER
K-AFTERCOOLER
L-WATER SEPARATOR
K
B
Refrigerant Gas Flow Line
Compressed Air Flow Line
Drain Flow Line
J
Compressed Air Dryer Working Principle

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7) Refrigerant circuit controls
A Liquid refrigerant injection: The liquid refrigerant is into the evaporator by a control valve. This valve is a
thermostatic or pressostatic one maintaining a constant overheats of the refrigerant in the evaporator(s).
B Constant evaporating pressure: In the dryers equipped with a by-pass valve, the evaporating pressure is
kept constant by a controlled injection of hot gas from the high-pressure side into the low-pressure
section of the circuit.
8) Condensate drain - trap assembly
Dismantling the drain is easy because it can be isolated from the air circuit under pressure with a ball valve.
The drain has to be depressurized before being dismantled.
9) Heat Exchanger Modular design
AThe dryers are equipped with a compact
Mono Bloc Heat Exchanger module.
This assembly has been specially designed to
dry compressed air and is made of:
1 An Economiser which pre-cools the
entering hot air with the out flowing cold air.
2 An air/refrigerant exchanger cooling down
the compressed air.
3 A centrifugal separator concentrating all
condensates and requiring no maintenance.
10) Accessories
Temperature switch: Temperature switch: Located inside the dryer, this temperature switch is adjustable
from 32°F up to 95 °F.
Digital Controller –DigiPro: This device helps dryer save energy when there is not any compressed air flow
in the dryer. Those information can be reached; Dewpoint value, periodic maintenance interval display,
status report, run time meter, temperature unit selection (°F or °C)

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3. OPERATION
Control panels for MH-US Series
The control panel of the dryer includes the following elements:
IMPORTANT NOTE
The Dryer has two Compressed Air Filter inside.
It is better to change filter element for the best eciency when the alarm status is active.
It is recommended to keep replacement filter elements in your stock in order to replace them when needed.
ATTENTION
MH-US range dryers have low pressure drop according its competitors.
Do not use MH-US range dryers together with other dryers which have higher pressure drop
without getting the confirmation from our technical team.
Monophase Digital Controller
MH-US-15 - MH-US-100 Digi-Pro

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3.1. During Operation
Regularly check the digital temperature controller ESD3 or Digi-Pro on dryer.
3.2 Start up and shut-down
Warning: Avoid leaving the dryer o when compressed air is still flowing through it.
3.3 Starting for the first time or after a long stop
1 Set the rotary switch to “I” This preheats the dryer and turns the drain system on.
It is recommended to leave the dryer power on permanently so the crankcase heater runs continuously.
IMPORTANT NOTE!
2 After a long stop of the dryer it is MANDATORY to allow a preheating period of minimum 4 hours
before starting again, to avoid any compressed air flow during preheating.
3 Follow the daily starting and shut down preocedure.
3.4 Daily starting and shut-down
1 Push on the ON button to start the dryer.
2 The start light or Dryer Active will indicate that the dryer is running.
3 To stop the dryer, first stop the airflow (either shut-down the air compressor or close the inlet/outlet or
by-pass valve) When the air flow is stopped, set the rotary switch on “ 0 “ Set it again on “ I “ in order to keep the
preheating on.
IMPORTANT NOTE !
4 Avoid leaving the dryer stopped when compressed air is still flowing through it.
5 To switch the already preheated dryer on again, simply push the green start button.

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4) ELECTRICAL CONTROLLER
4.1 DIGI-PRO
4.1.1 Description
With the Digi-Pro series controllers, air dryers have outstanding technology for both functionality and
dynamism, as well as appearance. The multi-functional display provides an accurate digital dew point
display as well as coded alarm monitoring of the refrigerant dryer.
DIGITAL CONTROLLER ADVANTAGES;
• Digital dew point monitoring
• Energy-saving mode display
• Periodic maintenance interval display
• Status report
• Run time meter
• Fahrenheit and Centigrade selection
4.1.2 Operation
Using the Digi Pro controller as shown in the picture below:
4.1.3 Menu Buttons
To modify the parameter, press and release button set. The menu
is used by service team. To disable the Key Lock: Press and hold
the SET for 4 sec.
PROGRAM
This button is used for starting and stopping the dryer. Press and
hold for 4 seconds to start or stop.
POWER
These buttons are used to navigate between screens and adjust
values.
MENU
This button is used for manual control of the drain output. Press
and hold for 4 seconds to drain manually.
MANUAL DRAİN

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4.1.4 ALARM DISPLAY
Alarms / warnings are displayed on the digital screen. That means the dryer is not working
under normal operating conditions, which are outside the range of set values.
Please contact to the service when an alarm/warning occurs.
4.1.5 MODE DISPLAY
This mark indicates that the dryer is performed in active state
and drying.
DRYER ACTIVE MODE
Shows if the drain system is activated.AUTOMATIC DRAIN MODE
Shows if the energy saving mode is activatedENERGY SAVİNG MODE
Indicates that Celsius temperature unit is selected.CELSİUS UNİT MODE
Indicates that Fahrenheit temperature unit is selected.FAHRENHEİT UNİT MODE
This mode shows that the dryer is ready for drying operation.COMPRESSOR STANDBY MODE
This mode shows that the dryer in the service time.SERVİCE MODE
Alarm Code Alarm Description Reason for Alarm
tAL Low Temperature Alarm Refrigerant line temperature is lower than specified set values
tAH High Temperature Alarm Refrigerant line temperature is higher than specified set values
FIL Filter Change Alarm Filter element needs to be replaced
SEr General Service Alarm General service time of the dryer
HPr High Pressure Alarm Refrigerant high line pressure is higher than specified set values
Pr1 Temperature Probe Alarm Temperature sensor is faulty.
hFI Working Hours Alarm The dryer working hours allowed has been reached.

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4.2 Operation Principles
In order to start the dryer, the following conditions must be satisfied.
1. All the temperatures except the exchanger temperature and condenser outlet temperature must
be between their low and high limits. The low pressure line temperature can be ‘HIGH’.
2. Digital Input 3 (Compressor Fault) is not activated.
3. Digital Input 4 (Compressor Overload) is not activated.
4. Digital Input 5 (Fan Fault) is not activated.
5. Digital Input 6 (Fan Overload) is not activated.
6. Digital Input 7 (Phase Sequence Error) is not activated.
7. Digital Input 8 (Remote Disable) is not activated.
8. Digital Input 11 (High Pressure) is not activated.
9. Digital Input 12 (Low Pressure) is not activated.
If all the above conditions are satisfied, the dryer can be started.

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5. TECHNICAL SPECIFICATIONS
Model Capacity
(scfm)
Connection
Size
Voltage Refrigerant
gas
Pressure
drop
(psig)
MH-US-15 15 1/2" NPT 115/1/60 R134a 1,6
MH-US-25 25 1/2" NPT 115/1/60 R134a 2,5
MH-US-35 35 1/2" NPT 115/1/60 R134a 2,8
MH-US-50 50 3/4" NPT 115/1/60 R134a 1,7
MH-US-75 75 3/4" NPT 115/1/60 R134a 2,0
MH-US-100 100 3/4" NPT 115/1/60 R134a 2,4
FOR ALL MODELS
Nominal Working Pressure 100 psig
Maximum Working Pressure 230 psig
Maximum Ambient Temperature 120°F
Maximum Inlet Temperature 240°F

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6.1
MHUS
AIR FLOW DIAGRAMS

Page 18
6.DIAGRAMS
6.1 AIR FLOW DIAGRAMS
MH-US-15 - MH-US-25
M
S
2
4
1
6
5
8
11
3
AIR OUTLET
AIR INLET
M
7
10
12
9
2
REFRIGERANT GAS FLOW LINE
DRAIN FLOW LINE PILOT FLOW LINE
COMPRESSED AIR FLOW LINE
S
13

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6.1 AIR FLOW DIAGRAMS
MH-US-15 - MH-US-25
DESCRIPTION
POS. QTY
1
2
3
4
5
6
7
8
9
10
11
COMPRESSOR 1
2
1
1
FAN MOTOR
FAN SWITCH
HIGH PRESSURE SWITCH
FILTER DRIER
1
1
1
1
1
1
1
1
EXPANSION VALVE
HEAT EXCHANGER
AFTERCOOLER
12
SOLENOID VALVE
CONDENSER
MANUEL VALVE
WATER SEPERATOR
1
13 CHECK VALVE

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6.1 AIR FLOW DIAGRAMS
MH-US-35
M
S
2
4
1
6
5
8
11
3
AIR OUTLET
AIR INLET
M
7
10
12
9
2
REFRIGERANT GAS FLOW LINE
DRAIN FLOW LINE PILOT FLOW LINE
COMPRESSED AIR FLOW LINE
S
13