Master Bilt MPM-72 manual Loading, Cleaning

LOADING

Do not place product in the case until 6 hours after it is started. Stock cases as quickly as possible, exposing only small quantities to store temperatures for short periods of time. It is important to keep stock rotated properly so that older stock does not accumulate. A “First-In, First-Out” rotation practice will keep the products in good salable condition. Avoid loading the case so that product sticks out beyond the shelves or blocking the return air grille at the bottom of the case. This will interfere with the air flow of the case and will result in diminished performance.

CLEANING

To avoid electrical shock, turn the power off before cleaning.

The QMVM series cabinets are designed so that spills will accumulate in a drain pan. The drain pan is located underneath the return air grill. Be sure to clean all areas with a mild detergent and water periodically.

SERVICE INSTRUCTIONS (Trouble Shooting Guide)

1.High head pressure and high back pressure:

A.Condenser coil clogged or restricted.

B.Condenser fan motor defective.

2.Low back pressure and low head pressure:

A.Restriction in system.

B.Refrigerant undercharged.

C.Leak in system.

3.Pressures normal – cabinet warm:

A.Coil blocked with frost or ice (see #4).

B.Control set too warm.

C.Air screen disturbance.

4.Coil blocked with frost or ice:

A.	Defective temperature control.	E.	P-trap in drain not installed.
B.	Time clock not operating properly.	F.	Evaporator fan motor defective.
C.	Improper time clock setting.	G.	Air screen disturbance.

D.Ambient conditions above 75 F/55

5.Compressor starts and runs – but cycles on overload:

A.Low voltage.

B.Dropped phase (3 phase).

C.Overload protector defective.

D.High head pressure (see#1).

E.Relay or Capacitor defective.

6.Compressor will not start – hums, but cycles on overload:

A.Low voltage.

B.Relay defective.

C.Overload protector defective.

D.Start capacitor defective.

E.High head preasure (see #1)