Required system components
Valve assembly (accessory)
In 2-conductor systems, cold
or warm medium is fed through
the register in the unit and cold
or warm air can then be released.
Control is provide by the 3-way
valve assembly. It comprises
the electrically actuated valve
head and the valve body.
If the head is electrically activated,
it actuates the body, which routes
the medium into the register.
If the temperature is reached
then the head is switched off
and the medium is fed through
the bypass past the register.
The bypass serves to ensure
the minimum medium flow rate
for the chiller.
The time between being fully
open and fully closed can be
approx. three minutes.
NOTE
Valves for hydronic balancing
The calculated individual pressure
losses in the pipeline network
layout for each individual unit are
adjusted to the entire system
with pipe leg regulating valves
to be provided on-site.
The nominal flow rates
for the medium adjust
to the necessary values
as a consequence
of the pressure loss.
Anti-freeze protection (accessories)
A water glycol mix is generally
used as medium for a cold water
system. Depending on the use
to which the glycol type
and quantity is put, the viscosity
changes, the loss in pressure
Diaphragm expansion vessel (DEV)
To avoid pressure fluctuations
during standstill because
of temperature changes,
diaphragm expansion vessels filled
with nitrogen (moisture neutral)
must be integrated in the system.
No moisture can condense
in the nitrogen filler.
NOTE
Safety valve
Safety valves limit excess operating
pressure due to excess warming
or overfilling of the operating
medium. The valve outlet requires
unobstructed draining into a drain
line. Applicable local disposal
ordinances must be observed
if glycol is used.
Automatic bleed valves
The unit has one or two manual
bleed valves on the collector pipe
of the register. The unit can be
bled separately after the system
has been filled.
Automatic air vent valves must
also be installed at the highest
point in the collective lines.
When disposing, the product
requirements of the glycol
type which is used must be
observed.
CAUTION
Glycol tolerant air vent valves
are necessary when using
media that contain glycol.
CAUTION
Condensate tray
(standard equipment)
The delivery includes an additional
condensate tray for installation
on the side of the unit
in the suspended ceiling. This is
required to catch the condensate
that arises on a valve assembly
or on the valves provided
by the customer.
Subsequently check the incline
and that it is functioning correctly.
increases and the unit's cooling
or heating capacity reduces.
All system components must be
approved for use with glycol.
Connections to adjoining
room and fresh air intake
The unit has been designed
to enable cooling a second
room and taking in fresh air
independently of this.
Connections to adjoining room
and fresh air intake
KWD 25 EC-55 EC
Fresh air
connection
Adjoining room connection
Shut-off
valves
Additional
condensate tray
Valve body
Valve head
Manual bleeding
Manual bleeding
Manual drainage
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