Defrost Systems; Manual Defrost System; Automatic Defrost System; Figure 1. Fcb Overcounter Post-Mix Dispenser - Cornelius R-404A REFRIGERANT Service Manual

Transparent faceplate, attached to the front of each freeze cylinder, includes a self-closing dispensing valve and a
spring-loaded relief valve that protects freeze cylinder from accidental over pressure. The relief valve is also used to
bleed CO gas pressure from the freeze cylinder to atmosphere when filling the cylinder with product. Electronic sens-
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ing on each freeze cylinder motor provides a means of adjusting viscosity (consistency) of the dispensed product to
suit customer preference.
FIGURE 1. FCB OVERCOUNTER POST-MIX
DISPENSER

DEFROST SYSTEMS

The Unit is equipped with both manual and automatic hot-gas defrost systems. The automatic defrost system may be
programmed into the Unit to occur up to nine different times a day with a minimum of two hours between defrost time
settings or the system may be completely turned off.

MANUAL DEFROST SYSTEM

The Manual hot-gas defrost system may be activated at any time by pressing the ''DEFROST'' switch on front of the
Unit. Refrigeration compressor will operate for a short time, then both freeze cylinders will go into defrost for approxi-
mately 60 seconds. At the end of the manual defrost cycle, the Unit will return to normal operation. Manual defrost
may be cancelled at any time by pressing the ''CANCEL DEFROST'' switch.

AUTOMATIC DEFROST SYSTEM

The automatic hot-gas defrost system may be programmed into the Unit to occur up to nine different times a day with
a minimum of two hours between defrost settings. At the start of each automatic defrost cycle, refrigeration compres-
sor will operate for 30 seconds to pump freon out of the freeze cylinders evaporator coils.
After freon has been pumped out of the freeze cylinders evaporator coils, No. 1 freeze cylinders only will go into de-
frost cycle for approximately 7 minutes, then will return to normal operation. This ends the automatic defrost cycle of
the No. 1 freeze cylinder. No. 2 freeze cylinder will defrost 30 minutes after the start of No. 1 freeze cylinder. The next
automatic defrost cycle will occur according to the time programmed into the Unit. Automatic defrost may be can-
celled at any time by pressing the ''CANCEL DEFROST'' switch.
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