between the master and the slave remains less than the Lead/ Lag Balance Delta, the chiller designated as the lead will remain the lead chiller. The Lead/Lag changeover between the master and the slave chiller due to hour balance will occur dur- ing chiller operating odd days, such as day 1, day 3, and day 5 of the month, at 12:00 a.m. If a lead chiller is not designated, the master chiller will always be designated the lead chiller.

The dual chiller control algorithm has the ability to delay the start of the lag chiller in two ways. The Lead Pulldown Time parameter (Lead Pulldown Type, LPUL) is a one-time time delay initiated after starting the lead chiller, before checking whether to start an additional chiller. This time delay gives the lead chiller a chance to remove the heat that the chilled water loop picked up while being inactive during an un- occupied period. The second time delay, Lead/Lag Delay (Lag Start Timer, LLDY) is a time delay imposed between the last stage of the lead chiller and the start of the lag chiller. This pre- vents enabling the lag chiller until the lead/lag delay timer has expired.

A quicker start of the lag chiller can be accomplished by configuring the Start if Error Higher parameter (Start if Error Higher, LL.ER). If the difference between the common leav- ing water temperature and the set point is greater than the con- figured value, then the lag chiller will start.

A minimum on time for the lag chiller can be programmed with the Lag Minimum Running Time configuration (Lag

Minimum Running Time, LAG.M). This parameter causes the control to run the lag chiller for the programmed minimum on time. The Lag Unit Pump Select (Lag Unit Pump Control, LAGP) can be configured such that the pump can be on or off while the chiller is off. This parameter is only active in Parallel Chiller Operation.

For units with a Touch Pilot display, two additional steps must be completed to start the machine. On the master chiller, the Master Control Type must be configured for the start con- trol defined in the Machine Control configuration. To start the machines, the master chiller must be started with the Start/Stop button and Master Mode selected. The slave chiller must be started with the CCN Mode selected.

Each application, Parallel and Series, are described sepa- rately below.

DUAL CHILLER CONTROL FOR PARALLEL APPLI- CATIONS — To configure the master chiller for parallel applications using the Touch Pilot display, see Table 24. To configure the master chiller for parallel applications using the Navigator display, see Table 25. A power cycle is required for the values to take effect.

To configure the slave chiller for parallel applications using the Touch Pilot display, see Table 26. To configure the slave chiller for parallel applications using the Navigator display, see Table 27.

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Carrier 30XW150-400 specifications
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30XW150-400 specifications

The Carrier 30XW150-400 series is a line of water-cooled chillers that exemplifies innovation, efficiency, and reliability in commercial cooling solutions. Designed for medium to large-scale applications, this series is ideal for a variety of settings, including commercial buildings, industrial processes, and chilled water systems.

One of the standout features of the Carrier 30XW series is its efficiency. The chillers utilize advanced variable-speed compressor technology, which allows the units to adapt to varying cooling loads while minimizing energy consumption. This technology not only reduces operational costs but also contributes to better environmental sustainability by lowering greenhouse gas emissions.

The 30XW series chillers are equipped with high-efficiency, scroll compressors that operate quietly and provide significant energy savings. By utilizing enhanced economizer controls, these units can achieve higher efficiency ratings, especially in part-load conditions. The result is an impressive Energy Efficiency Ratio (EER) and Seasonal Energy Efficiency Ratio (SEER), making these units a smart choice for energy-conscious businesses.

In terms of reliability, the Carrier 30XW150-400 series features robust construction and an array of safety and monitoring systems. The units come with advanced diagnostics that help in quickly identifying and addressing any operational issues. This proactive approach ensures reliability and minimizes downtime, which is crucial for maintaining optimal temperature controls in critical environments.

Additionally, the chillers incorporate environmentally friendly refrigerants that comply with the latest regulations, making them a sustainable choice for modern commercial applications. Their compact design allows for flexible installation options, and the integrated control systems provide the ability to optimize performance based on specific building management demands.

User-friendly interfaces and remote monitoring capabilities further enhance the ease of operation, allowing facility managers to have real-time insight into performance metrics and system health. This level of control contributes to better maintenance planning and maximizes the lifespan of the equipment.

In summary, the Carrier 30XW150-400 series of water-cooled chillers combines advanced technology, energy efficiency, and reliable performance, making it an ideal solution for various commercial and industrial cooling needs. With its commitment to innovation and sustainability, Carrier continues to set the standard in the HVAC industry.
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