If you have to attach brackets or fasteners to the
AHU panels or frame, use only those specially
approved for your AHU as otherwise there is a risk of
leakages.
Fig. 33: Heat exchangers in a counter flow arrangement
1
Airflow direction
Stickers on the connection side of the heat
exchangers indicate the flow (Fig. 33/IN) and return
connections (Fig. 33/OUT) for a counter flow
arrangement.
Connect slide-out heat exchangers and droplet elimina-
tors with bends and detachable connections as other-
wise you will not be able to withdraw them.
Personnel:
HVAC technician
Protective equipment:
Industrial safety helmet
Hearing protection
Protective clothing
Protective gloves
Safety shoes
NOTICE!
Risk of damage to property from incorrect pipe
connections!
Take care to connect the heat exchanger pipes cor-
rectly as otherwise the pipes may twist or become
subject to adverse effects. This may eventually
damage the heat exchanger beyond repair.
–
Connect pipes in such a way that the heat
exchanger is not affected by vibration and that
no loads are imposed on it.
–
If there is too much weight on a water pipe (by
others), support the water pipe.
–
Do not use the connection point of the heat
exchanger as a fixing point for other parts.
–
When you tighten thread connections, be sure to
use a suitable tool (e.g. water pump pliers) to
counter the tightening force as otherwise you
may inadvertently damage the parts.
–
If an AHU is installed outdoors, use suitable
pipes and protect them from frost.
–
Ensure that no air gets trapped in the pipes.
Fig. 34: Using water pump pliers to counter the tight-
ening force
1.
Hold the threaded pipe tail of the heat exchanger
with water pump pliers (Fig. 34/2).
2.
Hold the threaded pipe tail with the pliers while
you use a spanner (hexagonal profile, Fig. 34/1) to
connect the heat exchanger to the pipework (pipe-
work by others).
5.5 Connecting the run around coil
system
Connect heat exchangers in a counter flow arrangement
as only a counter flow arrangement ensures that the
calculated capacity is achieved. Use only suitable parts
and materials and use only the marked connection
points to connect the hydraulic unit.
Installation
Connecting the run around coil system
Air handling unit X-CUBE
43
