Trane CVGF-SVU02B-E4 Operation And Maintenance Manual page 79

Controls checkout and
adjustments
Controls are checked and
calibrated during run-in of the
unit prior to shipment. Any
adjustments should be made
exclusively by authorized Trane
service technician.
It is strongly recommended to
have proper functioning and
setpoints of all controls checked
once per year.
Control settings
For control calibration and
check-out, contact an authorized
Trane service technician.
Trouble Analysis
See the Diagnostic List for
trouble shooting information.
The diagnostic must be
analyzed, corrections made by
qualified personnel and the
latching diagnostic reset before
the chiller can be returned to
operation.
Diagnostic Codes
A Latching diagnostic will shut
down the machine or a part of
the machine if so indicated. A
latching diagnostic will require a
manual reset to restore
operation. A Non-latching
diagnostic will shut down the
machine or a part of the machine
if so indicated. A non-latching
diagnostic will automatically
reset when the condition causing
the diagnostic goes away. If a
diagnostic is informative only,
no machine action is taken
except to load a diagnostic code
into the last diagnostic register.
Unless otherwise stated, all
active diagnostics will be lost on
loss of power.
CVGF-SVU02B-E4
Periodic
Maintenance
Leak Testing Procedure
To leak-test the CVGF, weigh a
one-pound charge of trace gas
and bring the pressure up to a
maximum of 75 psig (517 kPa)
using dry nitrogen. This pressure
has been found to be adequate
to find leaks in a CVGF when
using a sensitive electronic leak
detector. Set the scale to
"medium" which corresponds to
a 1/2-ounce (.015l) per year leak
rate and probe all joints
thoroughly. Be sure and relieve
the pressure in the unit before
evacuation or leak repair. Local
codes take precedence when
conducting evacuation.
WARNING
Hazard of Explosion!
Use only dry nitrogen with a
pressure regulator for pressurizing
unit. Do not use acetylene, oxygen
or compressed air or mixtures
containing them for pressure
testing. Do not use mixtures of a
hydrogen containing refrigerant
and air above atmospheric
pressure for pressure testing as
they may become flammable and
could result in an explosion.
Refrigerant, when used as a trace
gas should only be mixed with dry
nitrogen for pressurizing units.
Failure to follow these
recommendations could result in
death or serious injury or
equipment or property-only
damage.
Taking an Oil Sample
To obtain an accurate oil sample,
the chiller must be operating for
a minimum of 30 minutes. An
approved oil sample cylinder for
R134a should be used. Make
sure the upstream oil filter
isolation angle valve is
completely backseated in order
to close the 1/4 inch Schrader
valve port. Attach a low loss
hose or line with a Schrader
valve depressor to the oil
sampling 1/4 inch Schrader valve
located on the upstream oil filter
isolation valve.
Attach the other end of the hose
or the line to the oil-sampling
cylinder. Evacuate the cylinder
and hose or line to remove any
non-condensables or moisture.
Open the valve on the sample
cylinder. Turn the upstream oil
isolation angle valve stem
approximately one turn
clockwise to allow oil under
pressure to enter the sample
cylinder.
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