HEAD PRESSURE CONTROL [HEADMASTER]

receiver

receiver

discharge

discharge

condenser

condenser

 

above 70°F

below 70°F by-pass

normal

 

The Cornelius “I” series remote systems use an Alco Head Pressure Control, normally referred to as a head- master. This control is mounted in the remote condenser with a fan cycling control switch. Using both these controls gives the system positive operation under a wide range of condensing temperatures.

The cycling control starts the fan at 270 PSI and stops it at 205 PSI allowing a positive efficient operation at the high temperature operating ranges.

The headmaster controls the operation when the condensing temperature drops below 70°F. The “I” series re- frigerant charge is HP - 62 [R - 404A] and the headmaster dome charge setting is 200 PSI of nitrogen pressure making it stable under the low temperature operating range down to - 20°F.

The normal flow pattern through the headmaster is from the condenser port to the receiver port. When this flow pattern is unable to maintain a receiver outlet pressure equal to or above the dome pressure setting of the valve, the dome pressure will force the valve portage to change closing the condenser port and opening the by- pass port from the compressor discharge line. This allows the high pressure vapor from the discharge port to “buck” the receiver pressure back up. With the condenser port closed, the refrigerant is backed up in the con- denser, basically reducing the condenser size, assisting in maintaining the discharge portage flow and increas- ing the head pressure.

Remember, sense of touch to the lines of the headmaster will determine the flow path the headmaster is in, condenser to receive, or bypass to receiver.

High side gauge installed at the receiver outlet valve will determine if the headmaster is functioning to maintain the proper operating pressure.

In the event the control appears to be “stuck in bypass”, the pressure drop across the headmaster must be measured. With a gauge installed at the receiver outlet valve and the high side service valve, the pressure dif- ference at these two points must be less than the 15 PSI. The three most common causes of an excessive pressure drop are shortage of refrigerant, kinked remote lines, and excessive line length.

Eliminate refrigerant shortage first. Add refrigerant in two-pound increments (not to exceed six pounds) to determine if it corrects the pressure drop. If pressure drop is not corrected, inspect line set for sharp bends or kinks and correct as required. If adding refrigerant does not correct continued (bypass) condition and line set is not damaged, replace headmaster.

12/1/94

77

166240004

Rev 3/4/96

 

 

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Cornelius CR800, IAC 322, IAC227, CR1200, CR1400, IWC530, IWC330, IWC322, IAC330, IAC522, IWC522 Head Pressure Control Headmaster
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IAC530, IWCS227, IWC522, IAC522, IAC330 specifications

Cornelius has established itself as a leader in the field of beverage dispensing systems, and its range of machines, including the IAC 322, IAC 227, CR800, CR1200, and CR1400, showcases advanced technology and user-friendly designs tailored for various commercial environments.

The Cornelius IAC 322 is a compact and versatile air-cooled unit designed for high-volume beverage dispensing. It features an efficient refrigeration system that ensures optimal temperature control, providing beverages that are always served at the perfect temperature. Its user-friendly interface allows operators to manage settings easily, and its durable construction ensures longevity in busy environments.

The IAC 227 model is similar in design but is specifically optimized for lower volume settings. With a smaller footprint, it is ideal for cafes and small bars. This model also incorporates energy-efficient technology, minimizing power consumption without compromising performance. The IAC 227 maintains the same commitment to temperature control, ensuring each cup served enhances the customer experience.

Turning to the CR series, the CR800 stands out with its robust build and larger capacity. This unit is designed for establishments needing a reliable dispenser for a variety of carbonated beverages. The CR800's carbonation technology ensures each drink maintains the right level of fizz, contributing to a consistent taste. Its modular design facilitates easy maintenance and upgrades, making it a favorite among operators.

The CR1200 increases capacity, making it suitable for larger venues, including stadiums and large restaurants. This model incorporates advanced monitoring systems that track beverage levels and alert operators when supplies are low. The CR1200 also supports multiple beverage types, allowing for customization based on customer preference while maintaining ease of use.

Lastly, the CR1400 takes it a step further, combining high-capacity dispensing with cutting-edge technology. It features touchscreen controls for intuitive operation and automated cleaning systems that reduce downtime. The CR1400 is designed with a focus on sustainability, using recyclable materials and energy-efficient components to lessen its environmental impact while maintaining premium performance.

Together, the Cornelius IAC and CR series models represent the forefront of beverage dispensing technology, emphasizing efficiency, durability, and customer satisfaction. Whether for a small café or a large arena, these machines provide businesses with the tools they need to serve quality beverages consistently.
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