Installation with a Chilled Water System

Installation and Service Manual

9.Inspect the liquid level in the expansion tank. The system must be full and under normal operating pressure to ensure proper water level in the expansion tank. Ensure that diaphragm type expansion tanks are properly charged and not water logged.

10.Start the boiler according to the operating instructions in this manual. Operate the system, including the pump, boiler and radiation units, for one hour.

11.Recheck the water level in the expansion tank. If it exceeds half the tank volume, open the tank to reduce the water level. Recheck pressure charge on diaphragm type tanks.

12.Shut down the entire system and vent all radiation units and high points in the system.

13.Close the water makeup valve and check the strainer and pressure reducing valve for sediment or debris. Reopen the water makeup valve.

14.Verify system pressure with the boiler pressure gauge before beginning regular operation.

15.Within three days of startup, recheck and bleed all air vents and the expansion tank using these instructions.

Pipe refrigeration systems in parallel. Install duct coil downstream at cooling coil. Where the hot water heating boiler is connected to a heating coil located in the air handling units which may be exposed to refrigeration air circulation, the boiler piping system must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle. The coil must be vented at the high point and hot water from the boiler must enter the coil at this point. Due to the fast heating capacity of the boiler, it is not necessary to provide a ductstat to delay circulator operation. Also, omit thermostat flow checks as the boiler is cold when heating thermostat is satisfied. This provides greater economy over maintaining standby heat (see FIG. 41).

FIG. 41 Installation with a Chilled Water System

Boiler Operating Temperature Control

This unit can have up to four sensors. The four sensors are for inlet temperature, outlet temperature, system/tank temperature, or outdoor air temperature.

If the unit is ordered as a boiler without any options and you need remote sensing, you can relocate either the inlet or outlet sensors. For best performance, do not relocate the inlet or outlet sensors. Install an optional system sensor.

If the unit is ordered as a water heater, the tank sensor is included with the unit. Do not relocate the inlet or outlet sensors from their bulbwells.

The digital electronic operating temperature control for these units is located on the front control panel. The sensing elements for the temperature control are placed in the inlet and outlet bulbwells. See Remote Mounting of Sensors (Outdoor Air Sensor), on page 48 of this manual. Carefully observe the discharge water temperature on the initial boiler “ON” cycles. The location of the temperature sensor will generally require a lower temperature set point on the operating control to achieve the desired discharge water temperature from the boiler. These sensing element locations allow a boiler operating with a low to moderate flow rate to sustain longer burner on cycles, preventing short boiler “ON” cycles based on high discharge water temperatures. For example, a boiler operating with a 180°F (82°C) discharge and a 20°F (11°C) temperature rise would require approximately a 160°F (71°C) to 165°F (74°C) set point with the temperature sensor installed on the inlet side of the heat exchanger. The exact temperature set point is based on your system’s requirements.

399, CF-CH(E)-i&s-08, 999 - 750 specifications

Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 is a cutting-edge boiler designed for commercial heating applications. With its robust construction and high efficiency, this model stands out in the crowded market of heating solutions.

One of the main features of the Lochinvar 999 - 750 is its exceptional thermal efficiency rating. The unit incorporates advanced condensing technology that allows it to recover heat from flue gases, which helps in achieving efficiency levels of up to 99%. This efficiency not only reduces energy consumption but also lowers operational costs, making it an excellent investment for businesses looking to minimize their carbon footprint.

The boiler is designed to provide a powerful output of 750 kW, ensuring it meets the heating demands of larger buildings or commercial spaces. Its capacity makes it suitable for a range of applications including schools, hospitals, and industrial facilities. Moreover, the unit features a built-in cascading system that enables multiple boilers to be connected, enhancing system reliability and flexibility.

In terms of technology, the Lochinvar 999 - 750 is equipped with a user-friendly touchscreen interface. This innovative control system allows operators to monitor and adjust settings with ease, providing real-time performance data and alerts for maintenance needs. The intelligent controls optimize operation to match the heating load, further enhancing energy efficiency.

Safety is a top priority with this model. It is built with multiple safety features such as automatic shut-off valves, pressure relief valves, and flame monitoring systems, ensuring safe operation under various conditions. The unit also adheres to stringent industry standards and regulations, making it a reliable choice for commercial applications.

Furthermore, the Lochinvar 999 - 750 is designed with serviceability in mind. Its compact footprint and accessible components simplify maintenance, reducing downtime and associated costs. The unit also supports a variety of fuel sources, including natural gas, propane, and biodiesel, providing flexibility to meet different facility requirements.

In summary, the Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 represents a blend of efficiency, reliability, and safety in commercial heating. Its advanced technologies and thoughtful design make it a powerful solution for various heating needs, making it an ideal choice for businesses aiming for excellence in energy management and operational efficiency.