START-UP
Note: Regardless of which refrigerant will be used
for the operating charge, R22 may be used for leak
checking and pressure testing at startup.
Leak Testing
Visually inspect all lines and joints for proper
piping practices.
Isolate
• Compressors
—
Front-seat Service Valves on
Suction and Discharge. Close oil supply line
immediately downstream of the Turba-shed.
• Pressure Transducers
—
Close Angle Valves.
• Autosurge Pilot Valve—Close Angle Valves
on suction and discharge manifolds.
Open
• Ball valves
—
to branches, condenser, heat
reclaim, receiver.
• Main Liquid Line Solenoid Valve
—
Solenoid
should be energized.
• Branch Liquid Line Solenoid Va l v e
—
solenoid should be energized or manual
open used.
• Split Condenser
—
Both sides open. Energize
valve solenoid.
Disconnect
• Defrost Time Clock
—
Disconnect power to
the clock. Be sure all branches are in refriger-
ation mode and ensure that the defrost clock
cannot initiate a defrost during start-up
procedure.
Verify
• Refrigerant requirements for System,
Compressors, and TEV's in merchandisers and
coolers.
• Electrical supply and component require-
ments.
Test Charge
Use properly regulated dry nitrogen and R22
to pressurize the system with vapor only.
C h a rge about 25 pounds of R22 through a
d e h y d r a t o r. Through another line add dry
nitrogen to bring the system pressure up to
150 psig. Use an electronic leak detector to
inspect all connections. If a leak is found,
isolate, repair, and retest. Be sure system is at
150 psig, and all valves closed to isolate the
leak are opened. After the last leak is repaired
and tested, the system must stand unaltered
for 12 hours with no pressure drop from
150 psig.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
9 - 1
START-UPAND MAINTENANCE
Know whether a circuit is open at the power supply or not. Remove all power b e f o re
opening control panels. Note: Some equipment has more than one power supply.
Always use a pressure regulator with a nitrogen tank. Do not exceed 2 pounds of pressure
and vent lines when brazing. Do not exceed 350 pounds of pressure for leak testing high side.
Do not exceed 150 pounds of pressure for leak testing low side.
Always follow current EPA regulations and guidelines.
Warning
Always recapture test charge using
approved recovery methods.
Warning
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