97

NOTES:

1.Contactors 2M and S are mechanically interlocked.

2.Transition resistor fault protector (TRFP) is preset to trip if transition contactor (1A) remains energized for longer than one second.

3.When optional phase loss reversal relay (PMR) or phase loss, phase reversal, overvoltage, undervoltage relay (PMRVR) is not provided, terminals 3-13A and 3-13B are jumpered together.

4.When optional ground fault is not provided, terminals 3-13B and 3-13C are jumpered together.

5.This oil pump circuit breaker and terminal board TB7 are provided only on start- ers for centrifugal machines.

6.POT to be adjusted to 24 v at rated line voltage.

7.CT4 and CT5 are provided only when the optional watt transducer is provided.

8.These 3 wires to the ammeter switch are connected together only when the optional 3-phase ammeter is not provided.

9.PMRTR is provided only if the optional phase loss phase reversal relay (PMR) is provided. The combination PMRVR has an internal time delay and does not require PMRTR.

10.Connections on the above schematic are numbered to match the markings on the control wires within the starter. Wires entering terminal boards are marked with the terminal number.

11.Oil pump AUX. contact not supplied on screw machines.

NOTE: Optional features are indicated by bold dotted boxes.

Yellow wires remain energized when main disconnect is off.

Fig. 51 Ð Typical Wye-Delta Unit Mounted Starter Wiring Schematic (cont)

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Carrier 19XL specifications Typical Wye-Delta Unit Mounted Starter Wiring Schematic
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19XL specifications

The Carrier 19XL is a highly regarded commercial heating and cooling solution, designed to provide optimum performance and energy efficiency in various applications. This rooftop unit is engineered to meet the diverse needs of businesses, making it an ideal choice for those requiring reliable climate control in their facilities.

One of the standout features of the Carrier 19XL is its advanced cooling and heating capabilities. The unit utilizes a high-efficiency scroll compressor that ensures a quieter operation and improved reliability. The system can operate across a wide range of temperatures, making it versatile for various climates. Additionally, it offers both cooling and heating options, allowing for year-round comfort.

Energy efficiency is a focal point of the 19XL design. With an impressive Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF), this unit not only helps reduce energy costs but also supports environmental sustainability initiatives. The unit is equipped with environmentally friendly refrigerants, further contributing to lower greenhouse gas emissions.

The Carrier 19XL features a user-friendly control system, allowing for easy monitoring and management of the unit's performance. This control system is designed to maximize energy savings, offering features such as demand control ventilation and integrated economizers that facilitate the use of outdoor air for cooling, reducing reliance on mechanical systems when conditions allow.

Construction-wise, the Carrier 19XL is built to withstand tough environmental conditions. Its robust cabinet is made from galvanized steel, providing durability and protection against the elements. The design also includes insulation to minimize noise levels, creating a more comfortable indoor environment.

Maintenance is a key consideration in the design of the 19XL. The unit features accessible service ports and a simplified access panel, allowing technicians to perform routine maintenance with ease. This proactive design helps ensure the longevity of the system and minimizes downtime, keeping operations running smoothly.

In summary, the Carrier 19XL is an exceptional choice for commercial heating and cooling needs. With its energy-efficient features, advanced technology, and durable construction, it stands out as a reliable solution for businesses looking for sustainable climate control options.
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