Terminal Unit
Control (TUC)
The low temperature detection option protects the unit from freezing conditions by using a capillary line in the coil fins to
detect freezing conditions. The TUC uses the low temperature
sensor with a normally open valve. When the sensor detects
temperatures below 36° F, a binary Figure 31. The low temperature input turns the fan off, closes the sensor is a capillary tube
fresh air damper, disables the inserted into the coil to detect electric heat, and opens the con- freezing conditions.
trol valve. This creates a shutdown
latching diagnostic that requires a reset to resume normal operation. However, normal operation cannot resume until the water temperature rises to 44° F. See Figure 31.Low temperature detection is active even when the unit is off, but the TUC must remain powered for it to be functional.
The factory configures the 24V dry contact input as normally closed to indicate alarm. However, it also can be normally open
if using the correct switch.
Note: While the low temperature detection sensor can help minimize the risk of coil freeze-up, it cannot prevent this from occurring in all circumstances. The user is responsible to adequately protect the unit from freeze conditions.
Note: The capillary line of the low temperature detection sensor is in the section of the hydronic coil above the fan, nearest the control panel box. Locate the outside air wall box or ductwork so fresh air has a direct path into the fan. This allows the sensor to detect an accurate fresh air temperature and proper operation of a dual fan unit. Failure to do this could cause the low temperature detection sensor to incorrectly detect a potential freezing coil.
The condensate overflow detection device protects the unit from condensate water overflow. The switch is a float-type device located in the fan-coil unit’s auxiliary drain pan. See the “Condensate Overflow Switch” section and Figures 12 and 13 on page 26.
When there is a danger of condensate water overflow from the auxil- iary pan, the float rises with the water level in the pan. When the float rises to over 50 percent of its travel, the control valve closes. Also, a binary input causes the fan to turn off, the fresh air damper to close,
97

BIP4: Low

Temperature

Detection Option

BIP3: Condensate

Overflow

Detection Device

UNT-IOM-6

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Trane LO manual UNT-IOM-6
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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.
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