Carrier HS070-160 manual Keyboard and Display Module

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Each function has one or more subfunctions as shown in Table 2. These functions are defined in greater detail in t K Controls Operation section of this book.

Fig. 2 - Keyboard and Display Module

ELECTROWIC EXPANSION VALVE ~ The micro - processor controls the electronic expansion valve through the EXV driver module. Inside the expansion valve is a linear actuator stepper motor. To control the stepper motor’s position, the thermistor in the cooler and the thermistor in the lead compressor in each circuit are used to maintain a 20 F (1 I C) difference. Because the com- pressor sensor is after the compressor motor, which adds approximately 15 F (8.3 C) superheat, the 20 F (1 I C) control temperature results in U”F to 5 F (2.8 C) super- heat leaving the cooler. This improves the performance of the cooler.

At initial start-up the valve position is initialized to 0. After that, the microprocessor keeps accurate track of the valve position in order to use this information as input for the other control functions.

The control monitors the superheat and the rate of change of superheat to control the position of the valve. The valve stroke is very large; this results in very accurate control of the superheat.

The electronic expansion valve is also used to limit the maximum saturated suction temperature to 55 F (12.8 C) to keep from overloading the compressor during high cooler water temperatures. This allows the unit to start with very warm water temperatures.

THERMISTORS ~ The electronic control uses 7 ther- mistors to sense temperatures used to control the opera- tion of the chiller. Sensors are listed in Table 3.

CAPACITY CONTROL ~ The control cycles com- pressors and alternately loads and unloads cylinders to give capacity control steps as shown in Table 4. The unit controls leaving chilled water temperature. Entering water temperature is used by the microprocessor in deter- mining the optimum time to load and unload, but is not a control set point.

The chilled water temperature set point can be auto- matically reset by the return temperature reset or space and outside air temperature reset features.

Table 2 - Function and Subfunctions

FUNCTIONS

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Contents Controls Troubleshooting Guide Up Arrow Rtjturnipg to Keyboard and Display Module Control Sequence Controls Operation Keyboard Entry Display Description S E T El4 Keyboard Directory cant Operating Modes Alarms III Programming Functions Troubleshooting Compwssor is not running T21 Keyboard Display Comments Entry Response Compressor 24-V Control Circuit Wiring Simplified Thermistsr Temperature vs Resistance and Voltage English Thermistor Temperature vs Resistance and Voltage Sk Electronic Expansion Valves Thermistor Locations Electronic Expansion Valve Thermistor Compressor and Cooler Modules MoN Keyboard/Display Module I-ISIO Symptoms Page 1 1

HS070-160 specifications

The Carrier HS070-160 is a high-efficiency air conditioning unit renowned for its robust performance and advanced technological features, making it an optimal choice for both commercial and industrial applications. This model is a part of Carrier's commitment to providing reliable and energy-efficient climate control solutions tailored to meet diverse cooling needs.

One of the standout features of the HS070-160 is its impressive cooling capacity, which ranges from 70 to 160 tons. This range makes it suitable for various environments, from large office buildings to manufacturing facilities. The unit is designed with versatility in mind, offering the option for both air-cooled and water-cooled configurations, thereby allowing users to choose the most suitable setup for their specific installation needs.

The HS070-160 incorporates a state-of-the-art variable speed drive technology, which enables the compressor to adjust its speed according to the cooling demand. This not only results in enhanced energy efficiency but also improves overall comfort by providing more consistent temperature control. Additionally, the unit features high-efficiency scroll compressors that further improve its performance while minimizing energy consumption.

In terms of construction and durability, the HS070-160 is built to withstand harsh environmental conditions. The unit is equipped with corrosion-resistant coatings and sturdy components, ensuring longevity and reliable operation across a broad range of settings. The design also promotes ease of maintenance, with accessible service points that simplify routine checks and repairs.

Another noteworthy characteristic of the Carrier HS070-160 is its advanced control systems. The unit can be integrated with smart building management systems, allowing for precise monitoring and control of HVAC operations. This integration helps facility managers optimize energy usage and reduce operational costs while maintaining comfortable indoor climates.

Furthermore, the HS070-160 adheres to stringent environmental standards, making it an eco-friendly choice. It is compatible with low-GWP refrigerants, aligning with global efforts to reduce greenhouse gas emissions.

In conclusion, the Carrier HS070-160 combines efficiency, durability, and advanced technology, making it a top contender for businesses looking to invest in dependable air conditioning solutions. Its comprehensive features and characteristics not only enhance performance but also contribute to significant energy savings and environmental sustainability.
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