The safety lockout timer circuit starts timing the moment the trial for pilot ignition starts. When the timing period runs out, the trial for ignition ends, and the control module goes into lockout. Before another attempt to start can be made, the S86 must be reset. Reset by adjusting the thermostat or controller or to its "OFF" position. An alternate method is to shut the system power "OFF". If normal ignition does not occur, use the trouble shooting table to determine the problem.

START

STAGE 1

TRIAL FOR

IGNITION

1THERMOSTAT (CONTROLLER) CALLS FOR HEAT

2SPARK GENERATOR POWERED First valve (pilot) operator opens

3PILOT BURNER OPERATION

Pilot burner lights.

OR Pilot burner does not light.

Module senses flame

After 90 seconda system

current.

locks out; must be manually

 

reset.

aShutoff/lockout timing is stamped on module.

STAGE 2

MAIN BURNER

OPERATION

4FLAME CURRENT SENSED

Spark generator off.

Second valve operation (main) opens.

5MAIN BURNER OPERATION Module monitors pilot flame current.

POWER INTERRUPTION System shuts off, restarts when power is restored.

PILOT FLAME FAILURE

Main valve closed.

Module starts trial for ignition.

END

SERVICE

PRELIMINARY CHECK

6THERMOSTAT (CONTROLLER) SATISFIED Valves close, pilot and main burners are off.

The following visual checks should be made before trouble shooting and after installation or maintenance.

1.Check power to appliance and S86.

2.Manual shutoff cocks in gas line to appliance must be open.

3.Make certain all wiring connections are clean and tight.

4.First de-energize the system and wait at least one (1) minute. This resets the module allowing a return to start condition. Then energize the system.

5.Review the S86 system normal sequence of operation.

SYSTEM TROUBLE SHOOTING

Start the system by setting the thermostat or controller above required temperature. Observe system response. Establish type of malfunction or deviation from normal operation. Use the S86 Intermittent Pilot System Trouble Shooting Table to check for normal system operation.

Use table by following instruction questions in box. If the condition is true or okay (answer yes), go down to next box underneath. If the condition is not true or not okay (answer no), go right to the next box alongside. Continue checking

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Garland MCO-GS-10M, MCO-GD-10M, MCO-GD-10E, MCO-GS-10E service manual Start Stage, End

MCO-GD-10M, MCO-GS-10E, MCO-GD-10E, MCO-GS-10M specifications

Garland has made a significant mark in the market with its range of high-efficiency heaters, particularly the MCO-GS-10M, MCO-GD-10E, MCO-GS-10E, and MCO-GD-10M models. These advanced heating solutions are designed for various applications where reliability, efficiency, and versatility are essential.

The MCO-GS-10M and MCO-GD-10M models are particularly notable for their robust construction and dual-fuel capability, allowing them to utilize natural gas or propane. This flexibility ensures that users can choose the most cost-effective fuel source, making them ideal for both residential and commercial use. These models are equipped with state-of-the-art ignition systems that guarantee a swift and trouble-free start every time, minimizing downtime.

On the other hand, the MCO-GS-10E and MCO-GD-10E models are electric heaters that offer an environmentally friendly alternative without compromising performance. These units are designed with high-efficiency heating elements that ensure rapid heating while consuming less energy. Furthermore, their sleek and modern design allows them to blend seamlessly into any indoor environment, making them suitable for use in homes, offices, and other professional settings.

All four models incorporate advanced safety features, including automatic shut-off mechanisms to prevent overheating. They are designed with user-friendly controls, allowing operators to easily set the desired temperature and adjust fan speeds based on their specific heating needs.

In terms of durability, Garland has ensured that the exterior of these heaters is constructed from high-grade materials capable of withstanding harsh conditions. This ensures longevity and reduces the need for frequent replacements, providing excellent value for money.

Moreover, the technology embedded within these models, such as multi-stage heating and precise temperature controls, offers an optimal heating experience. They are designed to be energy efficient, helping consumers save on utility bills while still maintaining comfortable ambient temperatures.

Overall, the Garland MCO-GS-10M, MCO-GD-10E, MCO-GS-10E, and MCO-GD-10M units exemplify the perfect blend of innovation, efficiency, and safety. These models cater to a diverse range of heating needs while being environmentally aware, making them an excellent choice for users seeking reliable and effective heating solutions. Whether it's for home use or in a commercial setting, Garland's heaters deliver excellent performance that stands the test of time.