Page
55
of
56
RG66006951
‐
Rev.01
Attention: do not modify the calibration of the maximum pressure switch. Should the latter fail
to work, rising pressure causes the high pressure safety valve to open.
The
high
pressure
switch
must
be
reset
manually
;
this
is
possible
only
when
the
pressure
drops
below
the
value
indicated
by
the
set
differential
(see
Table
II).
Calibration
of
the
minimum
pressure
switch
The
low
pressure
switch
stops
the
compressor
when
the
intake
pressure
falls
below
the
set
value
for
more
than
120
seconds.
It
is
reset
automatically
only
when
the
pressure
rises
above
the
value
indicated
by
the
set
differential
(see
Table
II).
Calibration
of
the
service
thermostat
function
This
function
starts
and
stops
the
compressors
according
to
the
water
temperature
reading
at
the
chiller
unit
inlet
[water
returning
from
the
system].
Refer
to
the
section
of
the
document
on
the
microprocessor
control
for
further
details.
Calibration
of
the
antifreeze
thermostat
function
The
antifreeze
probe
is
located
at
the
evaporator
outlet
and
stops
the
compressor
if
the
water
temperature
drops
below
the
preset
limit.
Together
with
the
flow
switch
and
low
pressure
switch,
this
device
protects
the
evaporator
from
the
risk
of
freezing
as
a
result
of
faults
in
the
water
circuit.
Refer
to
the
microprocessor
control
manual
for
further
details
Calibration
of
the
anti
‐
recycle
timer
function
The
timer
function
prevents
excessively
frequent
compressor
starts
and
stops.
It
imposes
a
minimum
time
lapse
of
480
seconds
between
two
successive
starts.
Refer
to
the
microprocessor
control
manual
for
further
details.
Never change the delay time set by the manufacturer: incorrect values could cause serious
damage to the unit.
Summary of Contents for LEW CD
Page 1: ...GB Technical manual LEW Reversible Chillers and Heat Pumps LEW SERIES 40 420 kW ...
Page 2: ...Page 2 of 56 RG66006951 Rev 01 ...
Page 17: ...Page 17 of 56 RG66006951 Rev 01 Reference table for numbering used in layouts ...
Page 31: ...Page 31 of 56 RG66006951 Rev 01 HF64000614 overall drawing ...
Page 32: ...Page 32 of 56 RG66006951 Rev 01 HF64000592 overall drawing ...
Page 33: ...Page 33 of 56 RG66006951 Rev 01 HF64000608 overall drawing ...
Page 34: ...Page 34 of 56 RG66006951 Rev 01 HF64000581 overall drawing ...
Page 35: ...Page 35 of 56 RG66006951 Rev 01 HF64000609 overall drawing ...
Page 36: ...Page 36 of 56 RG66006951 Rev 01 HF64001344 overall drawing ...
Page 37: ...Page 37 of 56 RG66006951 Rev 01 HF64000803 overall drawing ...
Page 38: ...Page 38 of 56 RG66006951 Rev 01 HF64000627 overall drawing ...
Page 47: ...Page 47 of 56 RG66006951 Rev 01 HF64000906 overall drawing ...
Page 48: ...Page 48 of 56 RG66006951 Rev 01 HF64000908 overall drawing for LEW C units ...
Page 49: ...Page 49 of 56 RG66006951 Rev 01 HF64000908 overall drawing for LEW D W H units ...
