Trane CGAH Series User Manual

3.
After
unit
start-up,
leave
in operation for
at least
1S
minutes,
to
insure
pressure
is
stabilized.
Then check:
-
compressor
and
powered
fan
power
consumption
-
suction
pressure
-
discharge
pressure
-
the liquid
sightglass(es)
-
superheat
-
subcooling
-
pressure
drops
and temperatures
of evaporator.
All measurements
and readings from
pressure
gauges
must be
recorded.
according
to
the
procedures
set out
below:
Liquid line
sightglass
The refrigerant
should
be seen
to flow
through
the
sightglass
in
a regular
manner,
and
be
free
of
bubbles.
Bubbles
are a
sign that there
is not
enough refrigerant,
and of
a
possible
leak or
obstruction
on the
liquid
line.
Each
sightglass is fitted
with
a moisture
indicator.
As
the
refrigerant
flows
through,
the sightglass will
show
the
degree of rnoisture
in
the
refrigerant.
This reading
is
also
temperature
dependent. The indicator
should show
dry
refrigerant. lf
"moist
refrigerant"
id
displayed, keep
unit in
operation for
at least
twelve hours, and
check
again.
Superheat
Normal
superheat
is
7"-1OoK
on
the
standard unit.
Excess
power
supplied
to
the evaporator
produces
high
suction
pressure,
and
a
low
degree
of
superheat
can
draw
the
refrigerant
back
the
compressor. lnsufficient
superheat
is
corrected
by adjusting
the expansion
valve reduction
lever. lf
this
produces
no
result,
it
shows
that
either
the
expansion valve
bulb or
shutter valve
seat are no
longer
operating
satisfactorily.
The defective
component
must
to
be
replaced.
Sub-cooling
lf the system
is correctly
filled,
the
sub-cooling
value
of
the
refrigerant
valve
on the liquid line
should
be B"-1OoK
on a
standard
unit.
Condensor fan motors
All fans
are
secured
directly
to
the
motor
shaft.
The
operating
sequence
of fan
motors
is
controlled
by
the
SMM module.
Refer
to the
IOM
of
the Sil\4M
control
module.
Low
temperature operations
(air
intake
to
condenserl
lf the unit is
set to operate
at
a low
air
intake
temperature,
follow
procedures
below
to insure
the
chilled
water
circuit
is
properly
protectr:d.
Switch on
power
to
evaporator
and
water
pipe
heating
resistors.
lnsure
that
all
pipes
are
perfectly
protected
against freezing
Use
antif
reeze
solution
in
chilled
water
circuit. lf
for
any
reason,
the heating
resistors
in
the
chilled
water
circuit
cannot
be
supplied with
current,
the
solution must
be
able
to
withstand
any ice
formation
in
the circuit.
When
using
the antifreeze
solution,
manufacturers,s
instructions Íor filling
o1'
the
chilled
water
circuit,
the
degree
of
protection
and
test
procedures
must
be
strictly
followed.
Final
check
Bring unit
into
operation
on a
stage
by stage
basis,
to
meet changing
levels
in
tlre
degree
of cooling
required.
Once
the unit is operating
as it
should,
a
final
check
should be made
for
the following
points:
1.
Check that unit
is
clean,
and
clear
of any
debris,
tools,
etc.
,All valves
in
operating
position.
Close control
and
starter
panel
doors, and
check
panels
are
fixed.
2.
3.
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Trane CGAH Series Specifications

General

Brand	Trane
Model	CGAH Series
Category	Chiller
Language	English