990,000 2,070,000 Btu/hr Models | Lochinvar 999

Installation and

Service Manual

TROUBLESHOOTING GUIDE

990,000 - 2,070,000 Btu/hr Models

		Does the power
	Step 1	switch provide
	Step 1	power to the
		power to the
		control panel?
		YES
	Step 2
		Combustion air
		blowers come on.
		YES
	Step 3
		Status light(s) does
		not blink 1 flash
		continuous.

				Check the switch and/or
				the line voltage.
	NO			the line voltage.
	NO
								Exchange ignition
								Exchange ignition
							Check all safety limit	module.
		Is there 24VAC at B2 on				NO	Check all safety limit
		Is there 24VAC at B2 on					devices and voltage from
		the terminal strip.

							the transformer to B2.
NO								Check fan relay

							NO
								board. Is there
			YES				Does F2 on ignition module	120VAC on red
			YES					120VAC on red
						YES	have 120VAC?	wires, pins #7 &
						YES	YES	#9?
								#9?
		Check 24VAC at TH					Check flow switch, all connectors
		(orange wire) on ignition					Check flow switch, all connectors
		(orange wire) on ignition			NO		behind control panel and Tekmar
		module(s).			NO		behind control panel and Tekmar	YES	NO
		module(s).					output pins #16 and/or #20.	YES


							Is there continuity from the fan		Replace fan
							relay board to fan(s)?		Replace fan
NO				Check air pressure					relay board.
NO				switch 24VAC on tan
				wire (N.O.)				YES

YES

Replace fan.

Replace air pressure switch.

Step 4

Does igniter(s) proof?

YES

	24VAC at PS (tan wire) at ignition module
	and/or connector plug for proving relay secure.
	Check Amp draw for 3.1 amps or
NO	greater.
	YES
	NO

Check air pressure	YES
switch for correct
pressures.	NO
	NO
Is Air Switch
bouncing?	YES
bouncing?

Correct air settings may have to clean burners/heat exchanger.

Replace igniter if less than 2.75 amps.

		Do the gas valve(s)	NO
		open and getting	NO
		open and getting
		24VAC?
Step 5
Is the flame sense	NO	YES
Is the flame sense
signal to the ignition
module 5uA dc or		Check inlet/manifold gas pressure
greater?		Check inlet/manifold gas pressure
greater?		both static and dynamic. Check
		both static and dynamic. Check
		down draft.
YES
Step 6
Unit is running.
	NO
		Call our Technical
		Service Department
		1-800-722-2101

Is 24VAC present at the main unit connector
(3x5 amp plug) red and/or red - black wire,
block position #01 and #02?


YES		NO


Replace gas valve.

	Check voltage at fan relay
	board. No Voltage at pins #10
	(red) and/or #02 (red-orange)
	check ignition module pin #05
	(replace RLY2402 if no
	voltage).	No Voltage at pins
	#08 (red-black) and/or #03
	(red-white) check Tekmar
	controller pins #17-18 (red-
	black) and/or #21-22 (red-
	white) input/output voltage.

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.