Danfoss MCHE Installation And Maintenance Manual page 6

Sevice guide | Application, Installation and Maintenance Manual MCHE
© Danfoss | Climate Solutions | 2024.12
3.3 Coil mounting against thermal expansion
Thermal expansion of aluminum is higher than
most other metals. Frequent thermally induced
stress could shorten the life of the micro channel
heat exchanger (Fig.4)
50 K
Allow it to move
Do not fix it in all 4 corners before you have
considered the impact from thermal expansion
To avoid the risk of thermal expansion, a micro
channel heat exchanger must be mounted with
brackets that allow some flexibility of movement.
Mounting methods as indicated in Figures 5a
and 5b are recommended.
Fig. 5a Mounting by bracket
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 &
supported so that the brazed joints are not
exposed to stress/tension. (Fig.6)
tubes should be pre-bent to avoid damaging or
collapsing the MCHE's copper/aluminum inlet/
outlet tubes and/or aluminum transition cups.
Mating tubes should be configured so that no
bending or forcing is required during installation.
Mating
Fig.6 Inlet/Outlet connection attentions
Allow it to move
Fig. 4 Coil mounting for MCHE
Steel frame
Sealing
MCHE
Sealing
Fig. 5b Mounting by end plate
Allow some
movement
due to thermal
Expansion
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