Sevice guide | Application, Installation and Maintenance Manual MCHE
6 |
AX292455807588en-000101 | 01.2019
3.3 Coil mounting against thermal expan-
sion
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)
Allow it to move
Do not fix it in all 4 corners before you have
considered the impact from thermal expansion
50 K
Allow it to move
Fig . 4 Coil mounting for MCHE
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 .
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
& supported so that the brazed joints are
not exposed to stress/tension . (Fig .6)
Mating 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 .
Fig .6 Inlet/Outlet connection attentions
Allow some
movement
due to thermal
Expansion