Series 8900SH Control Panel

Operation And Installation Manual

If the outside temperature continues to drop, then the calculated Reset Ratio (code 23) will be activated. More heat will be required to maintain the building temperature. To determine how much more, the control panel monitors (when in Automatic mode) the outdoor air temperature, the current Return Water Line temperature, the design return water temperature, and the design outdoor temperature. It then determines the Reset Ratio, which is simply a way of calculating how much heat to add to the system to make up for heat loss. If the Reset Ratio is set at 1:1.5 then for every 1°F the outdoor temperature drops, the Return Water Line temperature will be increased by 1.5°F. It is possible to override the automatic mode and enter your own Reset Ratio in code 23.

The next code that is monitored is the Rate of Change Factor (code 24) which sets the speed at which boilers are brought on line and off line. This rate of change factor has a range of .01 to 2.00. The rate of change factor is a timer that counts from 0.00 to 99.00. When 99.00 is reached, a boiler is brought on line or taken off line. The rate of change factor is important because it allows for a balancing of how much heat is increased against how much heat the building naturally loses. The rate of change factor also allows you to determine how long each boiler will run before firing the next boiler in line.

Assume it is now 7:00 pm, the building is empty and dark, and three of the boilers have been used to maintain the building heat. Because the control panel was set to lower the temperature in the Return Water Line at 7:00 pm, it directs one boiler to go off line, allowing the Return Water Line temperature to fall the required 5 degrees. At 6:00 am the panel will increase the Return Water Line temperature back to normal so the building will be warm when the employees arrive.

An important feature of the Series 8900SH control panel is its ability to handle setback recovery. The control panel starts monitoring the Return Water Line temperature and outdoor temperatures 2 hours prior to the 6:00 am set point so it can calculate the most efficient way to fire the boilers. Instead of all the boilers firing simultaneously, the panel may only fire one boiler, but allow it to run longer to save on fuel.

If heat was needed in the building after 7:00 pm a simple keypad entry (code 81) will override the setback. This set back override can be done in advance, or at the time the heat is needed.

Assume it is now early afternoon and the outdoor temperature continues to rise. Only two boilers are needed to maintain the building temperature. When the outdoor temperature rises above 60° F, the control panel shuts the system down until the next time it's needed.

Section 2

Sequence of Operations

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Panasonic 8900 SH installation manual Operation And Installation Manual
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8900 SH specifications

The Panasonic 8900 SH is a remarkable addition to the world of smartphones, exemplifying cutting-edge technology and user-centric design. This model stands out with its exceptional features, which cater to a diverse range of users from tech enthusiasts to everyday consumers.

One of the most notable aspects of the Panasonic 8900 SH is its sleek and sophisticated design. The device boasts a premium glass and metal finish, providing an elegant look and feel that is both modern and durable. Its ergonomic shape ensures comfortable handling, allowing users to navigate seamlessly through its vibrant display.

At the heart of the Panasonic 8900 SH lies a powerful processor, delivering impressive performance for multitasking and demanding applications. Whether you're gaming, streaming, or juggling multiple tasks, this smartphone handles it with ease, thanks to its robust CPU and ample RAM. The device is equipped with an advanced graphics processor, ensuring visually stunning experiences, whether you’re playing graphics-intensive games or viewing high-definition videos.

One of the standout features of the Panasonic 8900 SH is its camera system. The smartphone sports a high-resolution camera that takes stunning photos even in low-light environments. With advanced image stabilization and various shooting modes, photography enthusiasts can capture moments with clarity and detail. The front-facing camera is also equipped with features that enhance selfies, making it a hit among social media users.

In terms of connectivity, the Panasonic 8900 SH supports a wide range of options, including 5G capabilities, ensuring lightning-fast internet speeds and seamless video calls. The device comes with multiple sensors, including a fingerprint sensor for quick unlocking and security features, elevating user convenience.

Additionally, the Panasonic 8900 SH offers substantial internal storage space, accommodating users who download various apps, music, and media. The expandable storage option through microSD cards adds an extra layer of flexibility for storage needs.

The battery life of the Panasonic 8900 SH is another commendable feature, designed to last throughout the day with moderate to heavy use. Fast charging technology is included, allowing users to quickly recharge their devices and minimize downtime.

In conclusion, the Panasonic 8900 SH combines style, performance, and practicality, making it an excellent choice for anyone in the market for a reliable and feature-rich smartphone. Its blend of advanced technology and user-friendly characteristics makes it a noteworthy contender in the competitive smartphone space. Whether for business or personal use, this device is designed to meet the needs of today's smartphone users.
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