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6/21 57-02611 / 101628 ©2021, Refrigerated Solutions Group™. All rights reserved. 14
VII. Final Check List for All Models
A. Check high-low pressure control settings:
• Low Pressure Control settings: cut out at 3psig and cut in at 20psig
• High Pressure Control settings: cut out is 450 psig and cut in at 375 psig
B. Check setting of defrost timer:
• Medium temperature 2 to 4 defrosts/24 hours, with 35 minutes fail safe.
• Low temperature 3 to 4 defrosts/24 hours, with 44 minutes fail safe.
C. Check operating pressure:
• Freezer (-10°F) with R448/449 refrigerant at a 90° ambient suction pressure range should be
8-10psig and the head pressure range is 260-275psig.
• Cooler (35° F) application with R448/449 refrigerant at a 90° ambient, suction pressure range
should be 44-48psig and the head pressure range would be 260-275psig.
D. Check electrical requirements of unit to power supply voltage.
E. Set temperature control for desired temperature range.
F. Check setting of thermostatic expansion valve for proper operation. Both freezer and cooler
superheat range should be 8-10 degrees.
G. Check sight glass for proper refrigerant charge.
H. Check compressor oil level.
I. Check system for proper defrost settings and operation.
J. Check condensing unit for vibrating or rubbing tubing. Dampen or clamp as required.
K. Open all valves completely counterclockwise.
L. Check packing nuts on all service valves.
M. Replace all service valve caps and latch unit covers.
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