Automatic Electric Defrost System.

The automatic electric 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 start of each automatic electric defrost cycle, the re- frigeration compressor will operate for a short time. No.1 freeze cylinder only will go into defrost cycle and de- frost for approximately 15-minutes, then the Unit will return to normal operation. This ends the automatic defrost cycle of No.1 freeze cylinder. No. 2 freeze cylinder will defrost 30-minutes after the start of No. 1 freeze cylinder. The next automatic electric defrost cycle will occur according to the time programmed into the Unit.

‘‘SLEEP’’ (SLEEP TIME)

UNITS EQUIPPED WITH HOT-GAS DEFROST SYSTEMS

NOTE: The following paragraph describes “SLEEP” (SLEEP TIME) operation for the Two-Flavor and the Four-Flavor FCB Dispensers No. 1 and No. 2 freeze cylinders. The “SLEEP” (SLEEP TIME) operation for the Four-Flavor FCB Dispenser No. 11 and No. 22 freeze cylinders is identical to the No. 1 and No. 2 freeze cylinders.

‘‘SLEEP’’ (SLEEP TIME) may be programmed into Unit to allow the Unit to go into sleep time (Unit shut down, freeze cylinders beaters and refrigeration systems not operating). At start of sleep time, the refrigeration com- pressor will operate for 30 seconds to pump freon out of the freeze cylinders evaporator coils, then No. 1 freeze cylinder will go into defrost and defrost for 60 seconds. After No. 1 freeze cylinder has defrosted, No. 2 freeze cylinder will go into defrost and defrost for 60 seconds. At end of the No. 2 freeze cylinder defrost, Unit will shut down and go into sleep time. The ‘‘SLEEP’’ (SLEEP TIME) operation for the Four-Flavor FCB Dispenser No. 11 and No. 22 freeze cylinders is identical to the No. 1 and No. 2 freeze cylinders.

UNITS EQUIPPED WITH ELECTRIC DEFROST SYSTEMS

‘‘SLEEP’’ (SLEEP TIME) may be programmed into Unit to allow the Unit to go into sleep time (Unit shut down, freeze cylinders beaters and refrigeration systems not operating). At start of sleep time, the refrigeration com- pressor will operate for 30 seconds to pump freon out of the freeze cylinders evaporator coils, then both freeze cylinders will simultaneously go into defrost and defrost for approximately 15-minutes. At end of the defrost cycle, the Unit will go into sleep time.

‘‘WAKE UP’’ (WAKE UP TIME)

‘‘WAKE UP’’ (WAKE UP TIME) may be programmed into the Unit to allow Unit to resume normal operation at a desired time. When programmed wake up time is reached, an alarm will sound for a short duration, then the Unit will resume normal operation.

NOTE: Automatic defrost, sleep time, and wake up time may be used in any combination together or separately.

FACEPLATE RELIEF VALVES

The faceplate relief valves, located in each freeze cylinder faceplate (see Figure 3), are spring-loaded valves that protect the freeze cylinders from accidental over-pressure. The relief valve is also used to manually bleed CO2 gas from the freeze cylinder to atmosphere during filling with product and if gas pockets form in the cylin- der during operation.

DISPENSING VALVES

Self-closing dispensing valves, located on the faceplates on front of the Unit (see Figure 3), are operated one at a time or simultaneously to deliver product to the customer.

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Cornelius R-404A manual ‘‘SLEEP’’ Sleep Time, ‘‘WAKE UP’’ Wake UP Time, Faceplate Relief Valves, Dispensing Valves
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R-404A specifications

Cornelius R-404A is a synthetic refrigerant blend widely used in various refrigeration and air conditioning applications. Composed primarily of three components—R-125 (44%), R-143a (52%), and R-134a (4%)—this blend is designed to provide effective cooling performance in both commercial and industrial environments. Its popularity can be attributed to its efficient thermodynamic properties, making it a suitable choice for low and medium temperature refrigeration systems.

One of the hallmark features of R-404A is its high energy efficiency. As a refrigerant, it offers excellent performance in heat transfer capabilities, which translates to lower energy consumption and operational costs. R-404A operates effectively within a wide range of evaporating temperatures, allowing it to serve various applications, from refrigerated display cases to cold storage facilities. The refrigerant's low glide temperature helps maintain consistent temperatures in these applications, enhancing food safety and product quality.

R-404A does not belong to the ozone-depleting substances category, making it an environmentally friendly choice. However, it is important to note that R-404A does have a significant global warming potential (GWP) of 3,922, raising concerns regarding its long-term environmental impact. As awareness of climate change increases, industries are shifting towards alternative refrigerants with lower GWPs, but R-404A remains prevalent in many existing systems.

In terms of compatibility, R-404A is non-toxic and non-flammable, making it a safe choice for use in commercial environments. Additionally, it is compatible with oils traditionally used in refrigeration systems, simplifying retrofitting processes when upgrading from other refrigerants. R-404A is also designed to work with standard refrigeration components, ensuring compatibility with existing equipment.

To maximize efficiency and performance when using R-404A, proper system design and maintenance are critical. Regular checks for leaks, appropriate charge levels, and routine maintenance can help extend the life of the system while ensuring optimal performance of R-404A as a refrigerant. As industries continue to adapt to evolving regulations and environmental concerns, the future of R-404A will likely involve the transition to lower-GWP refrigerants, but its robust features and performance continue to make it a staple in the refrigeration landscape.
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