Pre-charge Check List
Preparation for charging can begin while the sys-
tem is being evacuated. During any of the pull
downs, check:
Merchandisers
Electrical requirements and power supply
Electrical connections tight and clean
Proper fan operation
Thermostat setting.
Walk-in coolers and freezers
Electrical requirements and power supply
Electrical connections tight and clean
Proper fan operation
Thermostat setting.
Condensers
Electrical requirements and power supply
Electrical connections tight and clean
Proper fan operation
Thermostat or pressure settings
Damper operation, if equipped.
Heat Reclaim and other systems
Electrical requirements and power supply
Electrical connections tight and clean
Component operation.
Note: Remember to reinstate control to unit
components jumpered to make tests.
Set all mechanical pressure controls. Compressors
should still be isolated from the rest of the system.
Set all electronic compressor controls into switch-
back so the mechanical controls are in command
of all system functions.
During the last evacuation look up and make a list
of the required control settings for the system. A
copy of the equipment legend will be needed to
determine the system's design operating points.
High and low pressure, heat reclaim lockout,
winter control settings, and other controls on the
system should be noted.
Charging
Open
Compressors—Backseat Service Valves on
Suction and Discharge. Open oil supply line
immediately downstream of the Turba-shed.
Pressure Transducers—Open Angle Valves.
Leave Isolated
Autosurge Pilot Valve—Leave Angle Valves
closed on suction and discharge manifolds until
system stabilizes.
Connect
Defrost Time Clock—Connect power to the clock
and set to proper time.
Leave Open
Ball valves—to branches, condenser, heat
reclaim, receiver.
Main Liquid Line Solenoid Valve—Now under
control of defrost clock.
Branch Liquid Line Solenoid Valve—Back out
manual open screws.
Suction Stop EPR or CDA Valves—Suction Stop
EPR under control of defrost clock. CDA Valves
replace fuse in panel board to place under control
of defrost clock.
Split Condenser—Operating under pressure
controls.
Check
Oil levels for all compressors and Turba-shed.
September 1, 1997
P/N 401789
8 - 3
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
Never trap liquid refrigerant
between closed valves.
Hydraulic explosion
may result.
Warning
Return to Contents