Service Stem Valves, Moisture Contamination

SERVICE STEM VALVES

When closing the service stem valves to remove your gauge and manifold set always close the high side stem valve first. Following this procedure will allow the system to “PULL” the refrigerant vapor from your manifold set to reduce refrigerant loss. When the pressure has been reduced, close the low side stem valve.

MOISTURE CONTAMINATION

With the major changes in refrigerants in today’s marketplace and the use of hydroscopic oils the control of moisture and contaminates have become more critical to safeguard against than ever before in the history of mechanical refrigeration.

Contaminates are also the most difficult of all problems to determine. A Meg-Ohm meter “Megger” can be a valuable tool to aid in the analysis of this problem. A Meg-Ohm reading log may be started any time after 90 days of operation of the product. To perform the test, proceed as listed.

Disconnect all three (3) compressor leads, take a Meg-Ohm meter reading from each compressor terminal to a good chassis ground. Compare reading to chart below:

Meter Reading	Compressor Condition	Maintenance Required
Meg8Ohm

100 8 ∞	Okay	None needed.
50 to 100	Moisture present	Replace drier.
20 to 50	Severe moisture & possible contaminated oil	Replace drier with acid hold type. Run 24
	with acid present	hours, change to regular drier.
.5 to 20	System has severe contamination	Remove compressor oil and refrigerant charge.
		Evacuate, install liquid and suction line driers

(acid hold type). Recharge with new oil and re8 frigerant. Run 24 hours. Discharge system, dis8 card suction line drier, replace the liquid line drier. Evacuate and recharge.

Readings in the range listed below 100 Meg-Ohm would be an indicator that the system being tested may have a contamination problem. Where does the problem come from? As an example, the filter drier may become sat- urated and hold large percentages of moisture and the system function without a problem until such time as the product operating conditions change. Should the room temperature increase, or the condenser plug-up etc., the higher operating pressures and temperatures may cause the drier filter to release a portion of it’s held moisture. It is also imperative to avoid opening the sealed refrigeration system whenever possible and when it is done to be certain the true problem is correctly diagnosed and repaired. Remember, service gauge sets should only be installed after all external checks have been performed.

CAUTION: Megger checks should NEVER be performed on any compressor that is under a vacuum.

COMPRESSOR CONTACTOR

The contactor serves as the voltage supply switch for the compressor circuit. Voltage to the coil of the contactor is supplied by the circuit board.

Check Out:

The two (2)* line supply screws of the contactor should always have supply voltage present when voltage is on to the product.

The other two (2)* screws (load) should have line voltage when the contactor is energized. The contactor coil receives its supply voltage from the circuit board. Should the contactor fail to energize:

12/1/94	27	166240004
Rev 3/4/96

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.