Danfoss MicroChannel Heat Exchanger User Manual Download

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ro-solutions.com

User manual

Installation, Operation and

Maintenance Manual

APP pumps (APP 21-43)

Service guide

MicroChannel Heat Exchangers

MCHE

Installation and Maintenance Guide

www.danfoss.com

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Summary of Contents for MicroChannel Heat Exchanger

Page 1: ...ro solutions com User manual Installation Operation and Maintenance Manual APP pumps APP 21 43 Service guide MicroChannel Heat Exchangers MCHE Installation and Maintenance Guide www danfoss com ...

Page 2: ...age and working environments 5 2 1 Storage 5 2 2 Handling 5 2 3 Bending procedure 5 3 Installation 6 3 1 Pass arrangement 6 3 2 Fan location and size 6 3 3 Coil mounting against thermal expansion 7 3 4 Elimination of gaps 8 3 5 Prevention of galvanic corrosion 8 3 6 Vibration 9 4 Leak repair 9 5 Coating 10 6 Maintenance 10 6 1 Filters 10 6 2 Shut down periods 10 6 3 Cleaning procedure 10 ...

Page 3: ...o comply with the instructions in this manual and or due to incorrect installation operation and mainte nance of MCHEs All personnel being responsible for operation and maintenance of theeat exchanger unit must read and fully understand these instruc tions before Transportation of the MCHE unit Lifting the unit Installing the MCHE unit Servicing the MCHE unit Maintaining the MVHe unit 1 2 General ...

Page 4: ...d that MCHEs be shipped flat and formed at the customer s location Bending Radius The minimum bend radius required to achieve acceptable manufacturing yields is a function of the microchannel tube fin and alloy the overall capabilities of the bending equipment including fixturing bending speed and bending length NOTE Conducting trial bending runs of the specific coil and configuration are recommen...

Page 5: ...upported bent legs As an example a coil with three 3 bends depending on fixturing may result in the load of the first 75 of the coil being transferred into the remaining coil leg possibly causing poor bend quality and or permanent deforma tion Bending challenges are greater with MCHE s than similar fin and tube coils requiring proper fixturing 3 Installation 3 1 Pass arrangement Carefully identify...

Page 6: ...f movement Mounting methods as indicated in Figures 5a and 5b are recommended Steel frame Sealing Sealing MCHE Fig 5a Mounting by bracket Fig 5b Mounting by end plate Inlet outlet connections are not designed to be used as handles support mating tubes resist thermal expansion or be forced into position with mating tubes during assembly etc In particular Inlet outlet connections must be assembled s...

Page 7: ...heat shield may be required to protect the MCHE s tubes and fins from the brazing torch The recommended pipe length L after the brazing joint should be greater than or equal to 70mm as shown in the picture below Fig 7 L 70 mm Fig 7 Recommended length of inlet outlet connections 3 4 Elimination of gaps To maximize heat transfer performance gaps should be eliminated on both sides of the face of the ...

Page 8: ...s in the case to prevent the MCHE from the influence of vibration is using rubber washers on the brackets or rubber supports on the manifolds fig 10a 10b Name Parameter Amplitude mm 0 15 peak to peak is 0 3 mm Acceleration m s 2 20 Table 2 The allowable vibration ranges Inlet Outlet 10 mm 10 mm Fig 9 Recommend test points of vibration Fig 10a Rubber washer Fig 10b Rubber support 4 Leak repair is n...

Page 9: ...ods During periods when the MCHE is not operated for longer than a week the MCHE must be completely cleaned following the cleaning procedure This practice must also be performed during short shut down periods where corrosive deposits accumulate on the MCHE 6 3 Cleaning procedure Relative to tube fin heat exchangers Micro Channel heat exchanger coils tend to accumu late more dirt on the surface of ...

Page 10: ... Danfoss DCS im 2019 01 AX292455807588en 000101 10 Danfoss MicroChannel Heat Exchangers Jia Xing Co Ltd No 8 Sangdelan Road Wuyuan Street Haiyan Zhejiang Province 314300 P R China www danfoss com ...

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