Entering Water Temperature Sampling Function

Terminal Unit Control (TUC)

Entering Water

Temperature

Sampling Function

The entering water temperature sampling function allows water to circulate in an attempt to sense water cold enough to provide cooling. The function uses a timer to permit the controller and the valve to fully open while the water circulates for 3 minutes. The fan continues to run at the selected speed. If the changeover sensor does not sense the correct water temperature within this 3 minute cycle, the valve closes and the entering water temperature sampling function will cease until 57 minutes elapse. After this time lapse, the water circulates again through the unit to determine if the entering water temperature indi- cates a call for cooling or heating.

Note: The entering water temperature sampling function is for units with 2-way valves. This function is not necessary for units with 3-way valves since water flows continuously through this piping configura- tion.

Table 38. Unit Mode as Related to Water Temperature

Unit Type	EWT Sensor Required?	Coil Water Temperature
2-pipe changeover	Yes	· Can cool if:
		space temp - EWT ³ 5 deg F
		· Can heat if:
		EWT - space temp ³ 5 deg F
4-pipe changeover	Yes	· Can cool if:
		space temp - EWT ³ 5 deg F
		· Can heat if:
		EWT - space temp ³ 5 deg F
2-pipe heating only	No	Hot water assumed
2-pipe cooling only	No	Cold water assumed
4-pipe heat/cool	No	· Cold water assumed in main coil
		· Hot water assumed in aux. coil

2-Pipe with Auxiliary Electric Heat (Fan-coils)

The auxiliary electric heat option allows heating when the occupied space requires heating but the unit still has chilled system water flowing through it. The electric heat is also sufficient for use as the sole source of heat for the unit.

The TUC utilizes a heating only output to energize electric heat if hydronic heat is insufficient to meet the heating requirements. This output responds to a demand for heat as long as the entering water temperature is lower than 95° F. However, if the water temperature reaches 95° F or higher, the electric heat lockout switch (on the supply water pipe) disengages the electric heat. Electric heat be- comes available again when the entering water temperature falls to 65° F or lower (± 5° F).

UNT-IOM-6

LO specifications

Trane LO is a cutting-edge solution in the HVAC sector, designed with advanced engineering and smart technologies to meet diverse climate control needs. Renowned for its reliability and efficiency, Trane LO offers a wide array of features that set it apart in the market.

One of the core characteristics of Trane LO is its energy efficiency. Equipped with variable speed compressors, the system can adjust its output according to the cooling or heating demand, ensuring optimal energy use. This feature not only reduces energy consumption but also lowers utility bills for users. Additionally, Trane LO units often come with a SEER (Seasonal Energy Efficiency Ratio) rating that ensures top performance during hotter months.

Incorporating state-of-the-art technology, Trane LO features Smart Technology integration. Through IoT (Internet of Things) capabilities, users can monitor and control their HVAC systems remotely via smartphones or smart home devices. This feature promotes convenience and ensures that energy use can be optimized from anywhere, giving users greater control over their indoor climate.

Another standout technology in Trane LO is its use of environmentally friendly refrigerants. The system is designed to utilize low-GWP (Global Warming Potential) refrigerants, making it compliant with modern environmental standards and contributing to a greener planet.

The Trane LO also emphasizes durability. Constructed with high-quality materials, including weather-resistant finishes, these units are built to withstand various environmental conditions, ensuring they maintain peak performance over the years.

Noise reduction is another critical aspect of the Trane LO line. With features such as sound blankets and vibration dampening technology, the units operate quietly, ensuring that the comfort of users is not compromised by disruptive noise levels.

Maintenance is simplified with the Trane LO, as several units are engineered for easy access to essential components, promoting hassle-free servicing. This is vital for prolonging the lifespan of the system and reducing maintenance costs.

In summary, Trane LO represents a fusion of energy efficiency, advanced technology, environmental responsibility, durability, and user-friendly features. Whether for residential or commercial applications, Trane LO systems stand as a reliable choice for effective climate control.

Trane LO manual Entering Water Temperature Sampling Function

Models: LO