Trane CGAH Series User Manual

Figure A
-
Evaporator
pressure
drops
with
R134a
Figure
B
-
Evaporator pressure
drops wÍth
R22
rO
80
€o
50
ao
30
9.
t0
t
f
6
5
to
00
5{t
,.(,
gt
Ê*
ê
ro
t
I
6
5
tr
Il
lll 1,
T,
'/,
/t
Á1r T-7r
J
R22
1t
/,
/,
/,
,//, /
/
t
]
System regulation
Regulation is
through
the
SMM control
module.
Refer
to the module
IOM
N" L80
lM
019
E
A
sensor is
placed
in the
bulbwell
on evaporator
water
leaving
side, where
it registers
water
leaving
temperature
from evaporator.
Unit operations
Switch on fused
mains
power
switch
to chilled water
circulation
pump,
and
start-up
pump.
Unit will start
up when
S1
switch
in control/command
box switches
to
position
1
(S2
switch to
position
1,
etc.).
The
unit will
operate
correctly
when there is
sufficient
water flow
at the
evaporator.
The compressor{s}
will start
up if
the evaporator
water
leaving
temperature
is
above
the SMM control
module
setpoint.
The
SMM
control
module
will react
based
on the increase
or
decrease in
the evaporator
water
outlet temperature.
Weekly
start-up
1.
Start up
chilled water
pump.
2. Switch
51 to
position
1, starting
up unit.
Weekend
shutdown
lf
the
unit needs
to be
shut down for
a short time,
switch
51 to 0.
lf
the
unit is
shut
down for
a
longer
period,
see
under
'Seasonal
shutdown',
below.
Seasonal shutdown
{Requi
res
qualified
technician}
1. The
evaporator
may be
drained
by opening
the
U4
connection
on the water
outlet
pipe.
2. Switch off mains
power
supply
switch.
Ensure
that
it
cannot be switched
on'while
the
unit is
at rest.
Seasonal start-up
(Requires
qualified
techniciian)
1. Ensure all
the
instructions
in
"Annual
maintenance.
instructions manual,
in
the
"maintenance'
chapter,
have been complied
with.
2. Fill up and
purge
chilled
water
circuits.
3. Insure liquid line
stop-valve
is
open.
4.
Check
for
possible
leak:;
in
system.
5. Switch on
51 switch
to 0
6. Switch on main
power
supplies
to
system.
7. Start up system.
8. Check all interconnecterj
devices
operate
properly.
9. Check oil level
and
service
pressures
after
the system
has been in operation
for
15
to 20 minutes,
under
full
load.
10. Check refrigerant
flow
is regular.
lf bubbles appear,
check for
possible
leaks;
in system.
11. Check
that
high
and
low
pressures
are
corrêct,
as
required for
the type
of unit
manufactured.
10
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Trane CGAH Series Specifications

General

Brand	Trane
Model	CGAH Series
Category	Chiller
Language	English