Operation Operation, Sequence of Operation

Sequence of

Operation Operation

Sequence of Operation

The thermostat controls the unit operation. It has both manual and automatic switches so the thermostat maintains desired comfort levels.

The fan switch allows manual selection of the fan speed using the On or Auto setting. With the switch set in the On position, the evaporator fan runs continu- ously, independent from the thermostat temperature setting. The Auto position cycles the evaporator fan on and off with the demand for heating or cooling.

The system switch may have two or more positions. For example, using a cooling only thermostat, the system switch can be set in the Off or the Cool position. The Off position disconnects power from the thermostat contacts that control the condensing unit. This prevents

Table OS-O-1. Normal Operating Conditions

the condensing unit from running, regardless of the thermostat tempera- ture setting. The evaporator fan may circulate air if the fan switch is in the On position. With the switch in the Cool position the condensing unit and evapo- rator will operate on a signal from the thermostat calling for cooling.

With the fan switch set to Auto and the system switch set to Cool, the following sequence takes place. On a rise in room temperature, the thermostat contacts close to provide power to the evaporator fan contactor, the condensing unit fan contactor, and the condensing unit compressor contactors. As the room temperature reaches setpoint, the thermostat contacts open to de-energize all contactors, and the system cycles off. This system will remain off until additional cooling is required and the cycle repeats.

high pressure	200 to 340 psig
low pressure	54 to 80 psig
superheat	8 to 12oC
subcooling	5 to 10oC
liquid sightglass	refrigeration flow with no gas traces
current	must not surpass the rated current

Table O-OS-2. Controls Adjustment

Control	Disarming	Rearming
High pressure control	395 +/- 15 psig	280 +/- 20 psig
Low pressure control	25 +/- 8 psig	80 +/- 12 psig
Limit low pressure control	10 +/-3 psig	35 +/-5 psig
Motorwindingsthermostat	105oC	82oC

SXIH-SVX01B-EN

SCIH specifications

The Trane SCIH, or Smart Communicating Indoor Unit, is a smart HVAC solution designed to provide both efficiency and comfort in commercial and residential spaces. This innovative system represents a significant advancement in climate control technology, integrating state-of-the-art features that cater to modern demands for convenience, connectivity, and sustainability.

One of the standout features of the Trane SCIH is its advanced communication capability. The system utilizes Trane’s proprietary technology to facilitate seamless communication between various HVAC components, enabling real-time monitoring and adjustments. This integration ensures optimal performance by allowing end-users to manage their climate control settings efficiently from a central location or through a smartphone app.

The SCIH is also designed for high energy efficiency. It incorporates variable speed technology that adjusts the compressor and fan speeds according to the specific heating or cooling needs of the space. This not only reduces energy consumption but also minimizes fluctuations in temperature, creating a more comfortable indoor environment. Additionally, the unit's Energy Efficiency Ratio (EER) and Seasonal Energy Efficiency Ratio (SEER) ratings often exceed industry standards, making it an eco-friendly choice for sustainable building practices.

Another characteristic of the Trane SCIH is its compact and versatile design. The unit is engineered to fit in tight spaces, making it suitable for various building types, including retrofits in older structures. Its sleek design enhances aesthetic appeal without compromising performance, a key consideration for both commercial and residential applications.

Safety and ease of use are also priority features of the SCIH. The model includes built-in diagnostics that can identify issues early, enabling prompt maintenance and reducing the risk of system failures. User-friendly interfaces provide intuitive controls, making it accessible for users of all technical backgrounds.

Overall, the Trane SCIH embodies the convergence of technology, comfort, and efficiency. Its smart features, including advanced communication, variable speed technology, and compact design, position it as a leading solution in the HVAC market. This unit not only meets the needs of the present but is also prepared to adapt to future energy standards and user expectations, reinforcing Trane’s commitment to innovative climate solutions.

Sequence of