Evaporative Cooling Humidifier
Installation Instructions and User Manual
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Stage 4 – Drain and Overflow Connections
Any installation work must be carried out by suitably qualified personnel.
Risk of flooding. Never connect drains to a closed pipe work. Always install a tundish to
provide a suitable air gap.
Recirculation Model
Direct Feed Model
CAUTION:
Do not combine the overflow and drain to a
common pipe if the
width
of the evaporation module is
below 30’’
(762mm)
or, if the
main drain
has to be
lifted
to the drain inlet of the building (if no slope can
be fitted).
CAUTION:
Do not combine the
overflow and drain to a common pipe.
Two independent traps should be
installed for drain and overflow and
sized according to the Table 5 below.
Illustration 8 - Drain and Overflow Connections
Table 4 - P Trap Installation
Drain Type
P Trap
Recirculation
Direct Feed
Main drain separated Required if there is no drain pump
x
Overflow separated Always
required
x
Main drain and
overflow combined
to a common pipe
Always required
if evaporation module over
30” (762mm) or if main drain
is not lifted to drain inlet
Table 5 - Water Drain and Overflow Specifications
SKV
Model
Tank
width
Drain outlet
size
Overflow
outlet size
Minimum slope
Trap size
Recirculation
≤
70’’ (1.8m) Ø ¾’’ (19mm)
Ø1.5’’ (38mm)
2
°
or 1.4’’for every 3ft
of horizontal run.
(35mm for 1m run)
1’’ for every 1’’ w.c of static
pressure (25mm / 250Pa)
>70’’(1.8m)
Ø ¾’’ (19mm)
Ø2’’ (51mm)
Direct feed
All
Ø2’’ (51mm) Ø1.5’’
(38mm)
2
°
or 1.4’’for every 3ft
of horizontal run.
(35mm for 1m run)
25mm for every 250Pa of air
static pressure
For AHU or duct with negative pressure, specific precautions should be taken to isolate the drain line in order to
avoid any back flow.
Overflow
Main drain
Combined drain outlet can be
directed to right or left hand side
P trap height
H = 1'’ for 1'’ w.c.
stat. press.
Slope of 2º is required for overflow (gravity) drain
If no slope can be fitted, separate the 2 drain lines
Open drain is required
Main drain
Ø 2'’ (51mm)
Slope 2º minimum
from horizontal
Open drain
P trap Height
H= 1'’ for 1'’w.c.
stat. Press.
Safety overflow drain
Ø
(38mm)
1-½’’
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