Electrical; Refrigerant Piping - Standex Master-Bilt B-SERIES Installation & Operation Manual

III. Electrical
Electric power supply must match the condensing unit power requirements indicated on the unit data
plate. A WIRING DIAGRAM IS LOCATED ON THE INSIDE OF THE ELECTRICAL BOX
COVER. All field wiring may enter the holes provided in left side, back and bottom of the electrical
box. All field wiring should be done in a professional manner, in accordance with all governing codes.
Double check all wiring connections, including factory terminals, before start-up of condensing unit.
DANGER
Installation of the refrigeration and electrical components must be performed only by a refrigeration
mechanic or licensed electrician.
Improper or faulty hook-up of electrical components can result in death.
IV. Refrigerant Piping
The condensing unit must remain sealed and pressurized from the manufacturer until piping is complete and final
connections are ready to be made.
Use only refrigeration grade copper tubing, (ACR), type "L", bright annealed, dehydrated, and properly
sealed against contamination. Soft temper tubing may not be used for field interconnection of
refrigeration components (condensing unit to evaporator assembly). Take extreme care to keep
refrigeration tubing clean and dry prior to installation. Use an appropriate size tube cutter (DO NOT
CUT TUBING WITH A SAW).
Note: The liquid line size is determined by conventional piping practices for air and electric defrost (use
chart on pages 15-16). For reverse cycle defrost, the liquid line must be selected by choosing the liquid
line one nominal step larger than the conventional approach. For example: for an evaporating
temperature = -20ºF, refrigerant R-404A, and a capacity of 20,000 Btuh, the conventional tables will
suggest a liquid line size of ½" OD. When utilizing the reverse cycle feature of the Master Controller,
the liquid line size should be 5/8" OD. When utilizing the electric or air defrost scheme, there is no need
to make the line larger.
Suction lines should slope down 1/2 inch for each 10 feet of horizontal run towards the compressor.
If any portion of the suction line rises above the exit elevation of the evaporator, P-type oil traps should be located
at the base of each suction riser for proper oil return to the compressor.
When brazing, dry nitrogen MUST be passed through the lines at low pressure to prevent scaling and oxidation
inside the tubing and fittings. All flux must be removed from the joints after brazing.
MINIMIZE the amount of flux used to prevent internal contamination of the refrigeration system.
Silver brazing wire is to be utilized (high temperature alloy of 15% silver content on all copper to copper
connections, and high temperature alloy of 45% silver content on all dissimilar metal connections).
5/16 Rev. B 57-02497 11