Fig. 27: Sloped pipe of a drain trap for negative pres-
sure
3.
Adjust the height of the drain tap based on the
above calculation. Drain traps for negative pres-
sure: Instead of shortening the pipe, you can
install the drain trap so that it slopes.
4.
Connect a drain trap to each condensate drain
Do not connect the drain trap to the drainage pipe;
the water from the drain trap should flow to a gully.
For hygienic reasons, the floor clearance must be
maintained for drain traps for negative pressure.
Air handling units to be installed outdoors or in
areas at risk of frost require frost protection for the
drain trap.
5.4
Connecting the heating coil/
cooling coil
Electric current
WARNING!
Danger of death due to electric current!
If electrical components come into contact with water
or a water glycol mixture, e.g. from a leak, you could
be seriously or even fatally injured. Water can also
cause damage to the air handling unit.
–
Lay connecting cables in such a way that they
cannot be accidentally damaged by mechanical
impact or by heat.
–
Do not lay connecting cables across electrical
components or switch cabinets as people may
become entangled in them.
Connect heat exchangers in a counter flow arrangement
unless a parallel flow arrangement has been specified
by the manufacturer. Only a counter flow arrangement
ensures that the calculated capacity is achieved.
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. 28: Exemplary illustration of the heat exchanger
connections in a counter flow arrangement
1
Airflow direction
Stickers on the connection side of the heat
exchangers indicate the flow ( Fig. 28 /IN) and return
connections ( Fig. 28 /OUT) for a counter flow
arrangement.
In special constructions of the heat exchanger, these
stickers may not show the correct type of connection.
The heat exchangers must always be connected in a
counter flow arrangement. For questions on the con-
nections, please contact the unit manufacturer.
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.
Installation
Connecting the heating coil/cooling coil
Air handling unit X-CUBE Ex
37
