REMKO WLT 25 - Manual (Page 17)

The control is implemented
through 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 increases and
the unit's cooling or heating
capacity reduces.
All system components must
be approved for use with glycol.
Diaphragm expansion vessel (MAG)
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 bleed
valves must also be installed
at the next highest point in
the collective lines.
During use and
disposal the product and safety
data sheets of the glycol type
which is used must be ob-
served.
CAUTION
Glycol tolerant air vent valves
are necessary when using
media that contain glycol.
CAUTION
Manual bleeding
Manual bleeding valve
Valve head
Valve body Outlet Inlet
Condensate drainage connection
If the temperature falls below
the dew point, condensation will
form on the cooling fins during
cooling mode.
Below the register is a collection
tray, which must be connected
to a drain.
■
The condensate drainage line
provided by the customer is to
be installed with a minimum
incline of 2 %. (Fig. 6).
If necessary, fit vapour diffusion
tight insulation.
■
Route the condensate drainage
line of the unit freely into
the drain line. If the condensate
runs directly into a sewer
pipe, fit a trap to prevent any
unpleasant odours.
■
When operating the unit at
outside temperatures below
0 °C, ensure the condensate
line is laid to protect it against
frost. If necessary, install a pipe
heater.
■
Following installation, check
that the condensate run off is
unobstructed and ensure that
the line is durably leak tight.
6 Incline of the condensate line
2 % incline
The condensate hose is designed
to be connected on the left-hand side
(as viewed from the front).
17