Installation and

Service Manual

TROUBLESHOOTING GUIDE

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

 

Does the power

Step 1

switch provide

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exchange ignition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check all safety limit

module.

 

 

 

Is there 24VAC at B2 on

 

NO

 

 

 

 

 

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

have 120VAC?

wires, pins #7 &

 

 

 

 

 

 

YES

#9?

 

 

 

 

 

 

 

 

 

 

 

 

Check 24VAC at TH

 

 

Check flow switch, all connectors

 

 

 

 

(orange wire) on ignition

 

 

 

 

 

 

NO

behind control panel and Tekmar

 

 

 

 

module(s).

YES

NO

 

 

 

 

output pins #16 and/or #20.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is there continuity from the fan

Replace fan

 

 

 

 

 

 

 

relay board to fan(s)?

 

NO

 

 

Check air pressure

 

 

 

 

relay board.

 

 

switch 24VAC on tan

 

 

 

 

 

 

 

 

wire (N.O.)

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

YES

NO

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

 

Is Air Switch

 

bouncing?

YES

 

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

 

 

 

 

 

24VAC?

 

Step 5

 

 

 

Is the flame sense

NO

YES

 

 

 

 

signal to the ignition

 

 

 

module 5uA dc or

 

Check inlet/manifold gas pressure

greater?

 

 

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.

63

Page 62 Page 64
Page 63
Image 63
Lochinvar 999 - 750, CF-CH(E)-i&s-08, 399 service manual 990,000 2,070,000 Btu/hr Models
Page 62 Page 64

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.
Top Page Image Contents