Garland MCO-GD-10E, MCO-GD-10M, MCO-GS-10M Start, YES Spark Across IGNITOR/SENSOR GAP, Yes

Page 14

and answering conditions in each box encountered, until a problem and/or the repair is explained. After any maintenance or repair, the trouble shooting sequence should be repeated until the trouble shooting procedure ends with a normal system operation.

START

TURN GAS SUPPLY OFF.

TURN THERMOSTAT

(CONTROLLER) TO CALL

FOR HEAT

POWER TO MODULE (24v

NOMINAL)

YES

SPARK ACROSS

IGNITOR/SENSOR GAP

NOTE: Before troubleshooting, familiarize yourself with the startup and checkout procedure.

NO

Check line voltage power, low voltage transformer, limit controller, thermostat

 

(controller) and wiring.

 

 

 

Pull ignition lead and

 

∙

On models with vent damper plug, make sure vent

 

check spark at module.

NO

 

damper had not been installed, then remove.

NO

Spark okay?

∙

Replace vent damper if necessary.

 

On other models, replace module.

 

 

 

 

 

 

 

YES

YES

TURN GAS SUPPLY ON

NO

PILOT BURNER LIGHTS?

∙Check ignition cable, ground wiring, ceramic insulator and gap, and correct.

∙Check boot of the ignition cable for signs of melting or buckling. Take protective action to shield cable and boot from excessive temperature.

∙Check that all manual gas valves are open, supply tubing and pressure are good, and pilot burner orifice is not blocked.

∙Check electrical connections between module and pilot operator on gas control.

∙Check for 24 Vac across PV-MV\PV terminals on module. If voltage is okay, replace gas control; if not, replace module.

YES

SPARK STOPS WHEN

PILOT IS LIT?

YES

NO

NOTE: If S8600B,H; S8610B, H goes into lockout, reset system. For S8600M, wait 6 minutes nominal for retry or reset system.

∙Check continuity of ignition cable to ground wire.

∙Clean flame rod.

∙Check electrical connection between flame rod and module.

∙Check for cracked ceramic flame rod insulator.

∙Check that pilot flame covers rod and is steady and blue.

∙Adjust pilot flame.

∙If problem persists, replace module.

 

 

 

MAIN BURNER

 

 

NO

 

 

 

LIGHTS?

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

SYSTEM RUNS UNTIL

NO

 

 

 

CALL FOR HEAT

 

 

 

LOSS?

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

CALL FOR HEAT ENDS

 

 

 

 

 

SYSTEM SHUTS OFF?

 

 

NO

YES

TROUBLESHOOTING

ENDS

S86 CHECKOUT AND

∙Check for 24 Vac

∙Check electrical gas control or gas

NOTE: If S8600B,H; wait 6 minutes nominal

∙Check continuity of NOTE: If ground is though operation is

∙Check that pilot flame

∙If checks are okay,

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Page 13 Page 15
Contents Direct ON-SITE Service 1-800-451-1165 General Information GarlandOverview of Operational Sequences Table of ContentsSpecification & Dimensions Component Access of Functional Components Common Wire DiagramsPilot Orifice PRES. W/C GAS Convection Oven GAS Specifications Main Pilot TotalDimensions & Specifications AMT Orifice NAT PROInstrumentation Manual Controls MCalibration of Thermostat Weighting Thermostat Operation Calibration NotesElectronic Controls E Robertshaw COM6000 Controller Electronic Control Failure CodesTemp Operation of the Pulse Function Operation of the Temperature FunctionOperation of the Timer Function User Preference Offset for the Electronic ControllersTo SET Oven Into Pulse Mode Timer Resolution ChangingTo SET Hold Temperature Change the HertzSecond Stage Main Burner Operation Safety Lockout TimeChain Programming Start Stage ENDStart YES Spark Stops When Pilot is LIT?Troubleshooting Ends S86 Checkout YES Spark Across IGNITOR/SENSOR GAPControl Module Flame Sensor Circuit Check GroundingCheck Spark Ignition Circuit Examples of Unsatisfactory Pilot FlamesAppearance Cause Right Front Component LocationsTop Front Center Lower FrontTo Remove Doors from the Oven File NameDisassembly of the Left Door To Reinstall Doors onto Convection OvenInstalling and Adjusting Door Chain Disassembly of the Right Door w/o window Page Convection Oven Motor To Replace or Adjust Door Latch MechanismTo Replace Convection Oven Motor Assembly Drawing Below Assembly Page Common Wire Diagrams Page

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.
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