Close the Ball Valve immediately downstream
of the Receiver and connect the proper
refrigerant to its Access Port. Slowly open the
liquid valve on the refrigerant tank and charge
the Receivers to 60% on the liquid gauge.
Disconnect refrigerant tank and open the ball
valve.
CAUTION: The remaining charge must be
added only as vapor t h rough the suction
header.
C h a rge the system to approximately 30% of
the receiver on the liquid gauge. Turn on
compressor number one to speed up charging.
Its suction pressure should remain below 20 psig
for low temperature and below 45 psig for
medium temperature units. If necessary, turn
on more compressors. Monitor the oil levels
c a r e f u l l y. At the first sign of trouble or
unusual compressor operation shut off the
system.
After 30% charge is achieved, check oil
levels. Bring on each compressor one at a
time.
Check:
Suction and discharge pressure
Oil Pressure
Voltage differential and balance
Ampere draw and balance.
Allow the full rack to operate until it stabi-
lizes. If the Receiver charge drops below 15%
add more vapor until a 15% level is obtained.
Watch oil levels, receiver liquid level and
possible flood back from evaporator.
Shut off all compressors and recheck oil
levels in each compressor and the Turba-shed.
Leak testing, evacuation and initial charg i n g
are now completed.
Final Checks
Once the system is up and running, it is the
responsibility of the installer to see that all
the fine adjustments are made so the Super
Plus™ Fibertronic™ delivers maximum tem-
perature performance and efficiency for the
customer. These include:
Defrost scheduling and timing
Condenser controls
Winter controls
Subcooling
Compound System operation
EPR, ORI and CDA settings
TEV superheat adjustment
CPR settings
High and low pressure controls
Main liquid line solenoid differential
Thermostat settings
Adjustments to electronic controls.
Thoroughly inspect all field piping while the
equipment is running and add supports where
line vibration occurs. Be sure additional
supports do not conflict with pipe expansion
and contraction.
When merchandisers are completely
s t o c k e d, check the operation of the system
again.
At 48 hours of operation replace the liquid
drier and suction filter cores.
At 90 days recheck the entire system,
including all field wiring. Change the oil filter
using a Sporlan SF-283-F. Future maintenance
costs may be reduced if an oil acidity test is
run at this time. Replace acid oil.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
START-UP and MAINTENANCE Revised August 1, 1996
9 - 4
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