5.3 Sizing and connecting the conden-
sate drain
Electric current
WARNING!
Danger of death due to electric current!
If electrical components come into contact with
water, e.g. from a leak, you could be seriously or
even fatally injured. Water can also cause damage to
the air handling unit.
–
Lay drainage pipes in such a way that they
cannot be accidentally damaged by mechanical
impact or by heat.
Height of drain trap
NOTICE!
Risk of leakages due to incorrect installation!
Do not connect the condensate drain to the sew-
erage system without a drain trap or with an unsuit-
able drain trap as this may result in air getting into
the AHU.
–
Use the AHU only with a suitable drain trap.
–
Do not connect the drain trap to the drainage
pipe; the water from the drain trap should flow to
a gully.
–
Use a different drain trap for each condensate
drain. Do not connect condensate drains with
each other.
Calculate the height of a drain trap as shown below.
Symbol:
P
- Pressure inside the air handling unit [Pa]; be sure
to use a positive value for calculations; take the
final differential pressure (filter etc.) into consider-
ation
1.5 - Safety factor to compensate for pressure fluctua-
tions in the system such as those resulting from
rapidly closing dampers (applies only to positive
pressure)
GR - Base frame height [mm]
R
- Distance R [mm]; minimum distance between
condensate drain (centre line) and floor
H
- Distance H [mm]; minimum distance between
base frame lower edge and floor
A
- Distance A [mm]; distance between base frame
lower edge and condensate drain (centre line);
depends on the base frame height (GR) and unit
width (B), see table
B
- Unit width (B)
C
- Distance C [mm]; distance between base frame
upper edge and condensate drain (centre line);
depends on the base frame height (GR) and unit
width (B), see table
Distances A and C
GR
Unit width
B
≤
2448 [mm]
B > 2448 [mm]
A
C
A
C
110
47
63
32
78
200
137
87
113
300
237
187
113
Installation
Sizing and connecting the condensate drain
Air handling unit X-CUBE
40
