PROJECT MANUAL Specifications Seafood Removal Walmart Store No 1186 Liberty TX

C. Make joints with use of brazing alloy containing minimum of 15 percent silver. Clean joints thoroughly before
brazing and have dry nitrogen at 1/2 psi pressure flowing through tubing while joints are being brazed to avoid
internal scale. If brazing alloy of less than 15 percent silver is found on job, Wal-Mart Mechanical Services
Construction Manager will require all fittings be cut out and replaced with new fittings using 15 percent alloy.
D. Install replacement parts (i.e. expansion valves, heat exchangers, sight glasses) using Harris Stay Brite #8,
excluding parts in hot gas lines. Use heat dams in all instances.
PART 3 - EXECUTION
3.1 INSTALLATION (BY REFRIGERATION CONTRACTOR)
A. Support cooler and freezer evaporators with 3/8 inch galvanized all-thread, double nutted through flat washers with
galvanized Unistrut bridging three ceiling panels.
B. Suspend refrigeration piping by Unistrut hangers or equal, space to prevent sagging. Fasten securely. Install
exposed piping to provide easy access in case of leaks. Slope suction lines downward toward compressor end.
Insure no oil traps are formed in piping.
C. Under no condition shall copper pipes touch each other when necessary to cross pipes. Offset or insulate to insure
no copper-to-copper contact. Refrigerant piping shall not come in contact with electrical conduit or other
dissimilar grounded metals.
D. Install oil traps before vertical risers and as recommended by Refrigeration equipment manufacturer. On risers
above 16 feet, double oil traps equally spaced are required.
E. Where refrigerant pipes penetrate building or cooler walls, insulate pipes and seal opening with suitable material.
F. Seal penetrations into walk-ins (refrigerant pipe, condensate drains) with urethane foam and seal over with silicone
caulk.
G. For loop piping circuits with remote temperature control valves - mount electronic suction pressure regulator
valves, TXV valves, pump down solenoids, thermostats, and heat exchangers. Allow enough pipe at evaporator
outlet to mount TXV feeler bulb insuring 100% contact.
H. For non-loop piping circuits with rack mounted temperature control valves - mount TXV valves, pump down
solenoids, thermostats, and heat exchangers. Allow enough pipe at evaporator outlet to mount TXV feeler bulb
insuring 100% contact.
I. Trap evaporators at coil outlet and vertical suction line risers over 4 feet tall. Traps shall be one piece type at
bottom of risers. Size P traps to match horizontal pipe or coil outlet pipe. Do not reduce to riser size. Take
vertical risers as high as possible (just below structure). Due to the special nature of the loop piping system utilized
on some projects, coordinate between the Contractor, the Wal-Mart Mechanical Services Construction Manager
and the refrigeration equipment supplier, to ensure that piping system is installed as designed.
J. Pitch horizontal suction lines minimum of one inch per twenty feet of run in direction of refrigerant flow.
K. Install trapeze hangers no farther than two feet on each side of 90-degree turns.
L. Install unions on condensate drains in walk-ins close to drain pan, allow clearance for pans to hinge open. Provide
heat tape on condensate lines inside walk-ins with temperature 32 degrees or less and insulate. Install common
condensate line outside the walk-in. Paint non-insulated copper drain lines to match walk-in box.
M. Maintain slope of one inch per ten feet of horizontal run for condensate lines. Provide traps in condensate lines
outside of walk-ins just before entering common condensate line.
15600-7
Walmart #1186 - Liberty, TX 04/20/11
CMA/10118.034