G-0400 REFRIGERANT FIELD
CONVERSION PROCEDURE
R-502 to R-402B
FOR MODELS
WARNING!
GR-0400A GR-0401W GR-0490N
GD-0402A GD-0403W GD-0492N
GY-0404A GD-0405W GY-0494N
Use only R-402B as
retrofit refrigerant. Other
replacement refrigerants
may cause poor performance
and/or component failure.
EQUIPMENT MODIFICATION REQUIREMENTS
Component
Change Required
Compressor
None (replacement compressor is precharged with POE oil)
Expansion Valve (TXV)
High Pressure Cut-out
Low Pressure Cut-out (Remotes)
Fan Cycling Control (Air-cooled)
All Solenoid Valves
Water Regulating Valve (Water-cooled)
Heat Exchanger
None
None
None
None
None
None
None
None
None
None
None
None
Electrical Wiring
Branch Circuit Fuse Size
Air-cooled Condenser
Water-cooled Condenser
Evaporator
SYSTEM PERFORMANCE AFTER CONVERSION
Daily Ice Production
G-0400 8% increase
Energy Efficiency
5% increase
Operating discharge (high) pressure: air-cooled models will run 20-30 psig (138-207 kPa gauge)
higher than R-502 pressures published in service manuals. Set water-cooled head pressure the same
as R-502 settings.
Operating suction (low) pressure: will run 1-3 psig (7-21 kPa gauge) higher than R-502 pressure
published in service manuals.
8010513
Sheet 1 of 2
08/96
Manitowoc Equipment Works
Division of The Manitowoc Company, Inc. • 2110 South 26 Street, P.O. Box 1720, Manitowoc , WI 54221-1720 USA
Telephone 414-682-0161 • Fax - Sales: 414-683-7589 • Service/Parts: 414-683-7585 • Other: 414-683-7879
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