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MECHANICAL
Remove grille and check refrigeration lines to see that they are free (not touching each other or
compressor). Spin condenser fan blade to see that it is free.
Check that all service valves are open.The picture below is Master-Bilt's standard DD-Unit. The compressor is
hermetic, it is internally spring mounted and ready to run.
Hermetic Compressors
Remove cabinet from crate base and slide into location. Cabinet must be level from side to side and front to back.
To comply with Sanitation requirements the cabinet must be mounted on legs (6" high min.) or casters or the base
must be sealed to the floor with an N.S.F. listed silicone sealant.
STARTUP
Uncoil the lead cord and pass it through the hole provided in the grill. While the cabinet is in operation, check the
voltage draw and the amperage draw versus this rating on the nameplate. Voltage should be checked at the
compressor terminals while the compressor is initially starting. The unit is designed to operate at +/- 10% of 115
volts, 60 cycle, single phase. This means that the voltage should be between 103 and 126.5 volts.
After the cabinet has pulled down in temperature to approximately 0°F at load line, check the thermostatic control by
turning it to its warmest position. This should shut the compressor off. Also check that the double pole single throw
switch turns the compressor off only. A separate 20 amp. fuse circuit for each cabinet is recommended to avoid the
possibility of other appliances on a circuit from overloading and causing a malfunction. Make sure that the electrical
service is grounded upon installation.
TEMPERATURE CONTROL
Punch Mark
The DD cabinet has a temperature control that is adjustable from #1
(warmest setting) to # 9 (coldest setting). Turn the control knob in line with
the punch mark to the desired setting. The temperature control is located
near the condensing unit at the bottom of the cabinet.
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