Annex
10—1
Internal
controller
in
the
cooling
compressor
units
Annex
10.
10.1
DVU
–
section
(cooling
unit)
The
air
handling
unit
section
–
DVU
–
is
a
separate
section
in
the
air
handling
unit,
and
the
section
contains
a
complete
stand
‐
alone
cooling
compressor
system.
The
system
has
been
started,
adjusted
and
optimized
before
the
delivery.
The
refrigerant
is
evaporated
directly
in
the
cooling
coil
and
the
cooling
capacity
is
regulated
automatically
and
steplessly
between
10
and
100
%.
The
system
is
delivered
with
the
HFC
refrigerant
R
‐
407C
in
the
circuit.
Internally
in
the
section
a
DVU
‐
internal
controller
‐
LMC251
‐
and
complete
control
system
take
care
of
all
safety
functions
as
well
as
the
frequency
converter
regulated
compressor
that
creates
exactly
the
cooling
capacity
ordered
by
the
main
air
handling
unit
controller
via
the
very
common
0
‐
10V
DC
signal.
When
the
demand
for
cooling
occurs
in
the
room,
the
main
air
handling
unit
controller
sends
a
start
signal
and
a
signal
exceeding
0
volt
to
the
cooling
compressor
system.
When
the
signal
exceeds
1.5
volt
the
cooling
compressor
starts.
After
start
‐
up
the
capacity
is
regulated
between
10
and
35
%
by
the
hotgas
valve
(HGV
in
the
illustration
below)
in
on/off
in
sequences
with
the
cooling
compressor
at
the
lowest
number
of
revolutions.
When
more
than
35
%
of
the
cooling
capacity
is
demanded
(signal
exceeds
more
than
3,5
volt)
the
hotgas
valve
closes,
the
cooling
capacity
is
regulated
by
the
frequency
converter
(FC
in
the
illustration
below)
to
the
strictly
necessary
revolutions
of
the
compressor.
By
declining
demand
with
the
compressor
at
the
lowest
revolutions,
the
hotgas
valve
is
regulated
on/off
in
sequences,
when
the
demand
is
less
than
34
%.
The
cooling
compressor
stops
when
the
demand
is
less
than
10
%.
To
avoid
that
the
compressor
stops
because
the
high
pressure
switch
(Hp
in
the
illustration
below)
cuts
off,
an
automatic
capacity
reduction
system
is
installed.
The
capacity
reduction
system
consists
of
a
pressure
transducer
(P
in
the
illustration
below)
installed
in
the
high
pressure
pipe
between
the
compressor
and
the
condenser
and
software
in
the
DVU
‐
internal
controller
that
reduces
the
revolutions
of
the
compressor
to
avoid
that
the
pressure
after
the
compressor
develops
to
the
cut
‐
off
pressure
of
the
high
pressure
switch
–
the
system
does
not
stop;
it
will
always
remain
cooling
to
some
extent.Air
volume
capacities
for
supply
fan
and
for
exhaust
fan
are
not
regulated
by
the
built
‐
in
controller
–
LMC251
‐
for
the
cooling
system,
but
by
the
main
air
handling
unit
controller.
The
technician
from
a
certified
installer
of
cooling
units
must
agree
with
the
installer
of
the
ventilation
system
and
the
main
air
handling
unit
controller
that
the
air
volumes
for
the
system
are
not
going
to
exceed
the
maximum
or
to
be
lower
than
the
recommended
minimum
mentioned
below
in
section
3.2.5.18
in
this
manual
3*400
VAC
Analog
in
Digital
in
Alarm
out
RS485
COM
Extract
Relay
out
Digital
‐
in
Relay
‐
out
Analog
‐
in
Relay
out
CapReg
On/of
Alarm
Supply
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