April 2020


Tips For Shutting Off Master-Bilt Equipment For An Extended Period Of Time

If you are turning your Master-Bilt equipment off for an extended period, we suggest using the following steps to ensure a trouble-free start up.

Cabinets

  • Turn the power off and unplug the unit.
  • Thoroughly clean and sanitize the cabinet inside and out.
  • Block the door open so it won’t get accidently closed. This will keep condensation from forming on the inside causing mold and mildew buildup.
  • Before start up, clean the interior, close the door and turn the power back on.

Walk-Ins With PRS-2 Series Refrigeration Systems

  • Locate the system’s power switch or breaker and turn it off.
  • Remove all product from the inside the walk-in.
  • Thoroughly clean the entire walk-in interior.
  • Locate and turn off the power for the light circuit. This will also turn the power off for the doorframe heater. If this is not done, the door gasket and/or doorframe heater can be damaged.
  • Block the doors open so they cannot accidently swing closed. Otherwise, condensation will form on the inside of the box and mold or mildew can form inside.

Walk-Ins With Remote Refrigeration Systems

  • If you have remote systems with outdoor condensing units, each system will have two breakers for the refrigeration system and one for the walk-in.
  • For medium temperature applications, or where applicable, locate and turn the power off to the evaporator section breaker either on top of the walk-in or hanging inside it. Wait five minutes for the condensing unit outdoors to pump down and turn off. It should only take two to three minutes normally.
  • For low temperature applications, the evaporator power is frequently powered from the condensing unit. If so, place the system into a manual defrost. Once the system pumps down and stores the refrigerant in the condensing unit, then turn the power off.
  • For systems equipped with the Master Controller electronic controller option, access the control board and manually close the valve. This will allow the system to pump down and store the refrigerant in the condensing unit.
  • Locate and turn off the breaker to the condensing unit.
  • Remove all product from the walk-in interior.
  • Thoroughly clean the entire walk-in interior.
  • Locate and turn off the power for the light circuit. This will also turn the power off for the doorframe heater. If this is not done, the door gasket and/or doorframe heater can be damaged.
  • Block the doors open so they cannot accidently swing closed. Otherwise, condensation will form on the inside of the box and mold or mildew can form inside.

Start-Up

When turning the system back on, if the temperatures outside are below 60°F, turn on the condensing unit only for 24 hours.  After that, on medium temperature applications, or where applicable turn on the power to the evaporator section and the light circuit.

For low temperature applications in which the evaporator is powered from the condensing unit, disconnect terminal 4 on the time clock. This will keep the solenoid valve from opening and flooding the evaporator. Disconnect one side of the contactor coil to keep the compressor from starting and energize the crankcase heater as mentioned above. After 24 hours turn off all power, reconnect the previous items and then turn all power on.

If you are unsure about any of these procedures, consult a service technician or the factory customer care department.