12.0 Self Contained Refrigeration System(s)

12.1
Packaged refrigeration system(s) shall be manufactured and factory installed by the walk-in unit manufacturer.

12.2
System(s) shall be complete and ready to operate without field assembly, installation, or start-up required.

12.3
Refrigerants shall be non-flammable type R-22, or R-404a.

12.4
Electrical controls including system breakers shall be supplied, installed and ready to operate with single point electrical connection by others.

12.5
Refrigeration system(s) shall be complete with the following: roof mount type horizontal discharge air cooled condenser, Copeland hermetic and semi-hermetic compressor (or equal) with overload protection and contactors (as required), weather hood finished to match exterior wall finish, fan guards, receiver tank with liquid shut off valve, suction line accumulator (on 3 HP systems and higher only), liquid line filter / drier and sight glass, high / low pressure control, liquid line solenoid valve, crankcase heater, low ambient controls to -20° F, room thermostat and U.L. labeled electrical control panel wired in accordance with N.E.C. standards.

12.6
Evaporator coils shall be furnished with appropriate defrost for operating temperature range.

12.7
Electric defrost shall be included on all refrigeration systems operating at +32? F and below. Electric defrost shall be time initiated and temperature terminated with time override and fan delay to reduce room condensation. All condensate pans shall be piped to copper drain line complete with heat tape exiting the wall nearest to drain pan. Evaporators shall be located as shown on plans and drawings.

12.8
Refrigeration systems operating at +33? F and above shall be off-cycle air defrost. Defrost periods shall be time initiated and time terminated. All condensate pans shall be piped to PVC drain line exiting the wall nearest to drain pan. Evaporators shall be located as shown on plans and drawings.

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