CAC Cassette Evaporator

REMOTE THERMOSTAT OPERATION for CAC Ductless Split Air Handler

Choosing a Thermostat: EMI offers several remote thermostats that are com- patible with the Ductless split system air handlers. See the latest price list for a list of available thermostats. It is important to choose a thermostat that will match the equipment that you have selected. For single stage cooling or hearting choose a single stage Heat/Cool thermostat.

Selecting a Thermostat “By Oth- ers”: When selecting a thermostat other than those offered by EMI, it is important to choose a 24V thermostat that matches your application. EMI equipment is com- patible with most mercury bulb, digital or power stealing thermostats.

Cooling Only With Electric Heat or Hydronic Heat: Select a thermostat that is compatible with a cooling - electric heat system. The thermostat should have “R”, “Y”, “W” and “G” terminals. The thermo- stat may also have a “C” terminal.

Fan Operation: Some thermostats are equipped with an auto/on fan switch. When this switch is placed in the on po- sition the indoor fan will run continuous. When the switch is in the auto position the indoor fan will cycle with the call for heating or cooling.

Fan Purge: The indoor unit is equipped an electronic circuit board with a purge feature. After the room thermostat has been satisﬁed, the purge feature al- lows the indoor fan to remain on for an additional 60 seconds. This increases ef- ﬁciency by pulling the remaining energy from the unit.

Cooling Operation: The electronic circuit board of the indoor unit also has an anti-short cycle timer (ASCT) feature designed to protect the compressor from short cycling. The ASCT is activated im- mediately following the off cycle of the outdoor unit. Once the room temperature is satisﬁed and the outdoor unit switches off, the ASCT will prevent the outdoor from restarting unit after a three-minute time period has elapsed.

After connecting the thermostat to the unit place the system switch in cool mode. Ad- just the set-point temperature below the room temperature. The compressor and fan motors will start and cooling will begin. For chilled water systems, the coldwater valve will open allowing the ﬂow of water. Place the set-point temperature above the room temperature. The outdoor con- denser will stop (or CW valve will close) while the indoor fan will remain on for an additional sixty seconds.

Electric Heat Operation (Optional): Place the thermostat system switch in heat mode. Adjust the set-point tempera- ture above the room temperature. The electric heat will energize along with the indoor fan motor. Heating will continue so long as the set-point remains above room temperature. Next place the set-point temperature below room temperature. The Electric heater will switch off and the indoor fan will remain on for an additional sixty seconds.

CAC Cassette Evaporator

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CAC specifications

EMI CAC, or Electromagnetic Interference Common-mode Current, is a critical concern in electronic device design and operation. It refers to the unwanted electromagnetic energy that can disrupt the normal functioning of electronic circuits, particularly in complex systems. EMI can arise from various sources, including power lines, radio frequency transmitters, and even other components within the same device.

One of the main features of EMI CAC is its dual nature. It can be both a source of interference and a metric to assess the integrity of electronic systems. The impacts of EMI are far-reaching, affecting communication signals, power supply reliability, and overall device performance. As technology progresses and devices become more compact, the likelihood of EMI issues increases, making it essential for engineers to develop effective solutions.

Several technologies are employed to mitigate EMI CAC in electronic systems. Shielding is one of the most common methods, involving the use of conductive materials to block electromagnetic fields. This can take the form of metal enclosures or coatings that prevent the escape of emissions. Another strategy involves the use of filters, such as ferrite beads and capacitors, which can suppress common-mode currents before they enter the sensitive parts of a circuit.

The characteristics of EMI CAC vary depending on several factors, including frequency, amplitude, and the specific environment in which the electronic devices operate. High-frequency EMI is particularly challenging due to its ability to penetrate enclosures and disrupt signals. Additionally, common-mode noise can often appear in differential signals, exacerbating the situation and making detection more difficult.

Achieving EMC (Electromagnetic Compatibility) is a major goal for designers dealing with EMI CAC. This involves not only reducing emissions from devices but also improving their immunity to external sources of interference. Effective grounding techniques and careful layout planning are crucial in minimizing EMI effects.

In summary, EMI CAC represents a significant challenge in modern electronics, with a need for advanced solutions to ensure device performance and reliability. By understanding its features, employing effective technologies for mitigation, and addressing its characteristics, engineers can create robust designs that thrive in the increasingly complex electromagnetic landscape of today’s technological world.