PROJECT MANUAL Specifications Seafood Removal Walmart Store No 1186 Liberty TX

B. Do not endanger any work by cutting or digging, and shall not cut or alter work of any other contractor without
consent of Wal-Mart.
3.5 TESTING, EVACUATION, AND CHARGING (BY REFRIGERATION CONTRACTOR)
A. Notify Wal-Mart Mechanical Services Construction Manager 72 hours in advance of tests so that Owner's
representative may be present for test if desired. Failure to notify Wal-Mart Mechanical Services Construction
Manager will result in having to repeat test.
B. When refrigeration connections have been completed, test system at minimum of 150 psig, but not to exceed 200
psig, with compressor suction and discharge valves closed, and all other valves in system open, with exception of
transducers which must be kept closed during pressure testing and evacuation procedures. Comply with
requirements of local codes if higher test pressures are required. Refrigeration piping will not be acceptable unless
it is gas tight. If leaks are found, isolate leaks, discharge gas and repair leaks, and then repeat test. When testing
has been completed, release pressure using safe procedure.
C. Evacuate system with vacuum pump specifically manufactured for vacuum duty, having capability of pulling
vacuum of 50 microns or less. Do not evacuate system by use of refrigeration compressor. Connect pump to both
low and high side evacuation valves with copper tube. Compressor service valves shall remain open. Attach high
vacuum gage, capable of registering pressure in microns, to system for pressure readings. Do not operate hermetic
or semi-hermetic motor compressors during evacuation because of reduced electric strength of atmosphere within
motor chamber. To check system pressure, provide hand valve between pressure gage and vacuum pump which
can be closed to isolate system and check pressure.
D. Evacuate each rack to an absolute pressure not exceeding 1,500 microns. Break vacuum to 2 psig with dry
nitrogen. Repeat evacuation process, again breaking vacuum with dry nitrogen. Install drier of required size in
liquid line. Evacuate to absolute pressure not exceeding 500 microns. Leave vacuum running for not less than two
hours without interruption, valve off, and remove vacuum pump. System shall hold 500 microns for twenty-four
hours. Contact Wal-Mart Mechanical Services Construction Manager for verification of system performance.
Raise system pressure to 2 psig with refrigerant, and remove vacuum. NOTE: Do not pull high pressures and low
vacuums on transducers.
E. Refrigerants normally used shall be R-22, R-404a, or R-407a. Use only refrigerant in equipment for which that
equipment was designed by manufacturer. Use only one type of refrigerant in system.
F. Charge refrigerant directly from original drums. Charge system by means of charging fitting in liquid line.
G. Top off all oil charges.
3.6 CLEAN-UP
A. Promptly remove all rubbish or debris resulting from the Work.
B. During course of the Work, the area in which the Refrigeration Contractor is working shall be kept in an orderly,
reasonably clean condition. Keep gang boxes off sales floor. Tools, supplies, etc., shall remain only as long as
they are in use. Abide by site cleanliness policies of General Contractor for general construction.
C. Thoroughly clean Work furnished and installed under this Contract, ready for Owner's use.
15600-9
Walmart #1186 - Liberty, TX 04/20/11
CMA/10118.034