Garland MCO-GD-10E manual

GARLAN D A WELBILT COMPANY BUILT TO LEAD... BUILT T O LAST SER VICE MANU AL THE “M ASTE R” GAS C ONV ECTION OVEN S Models covered in this manual are: MCO-GS-10M : M ASTER C ONVECTION O ven - G AS S TANDARD D EPTH -( 10 )S INGLE D ECK M anual C ONTROL MCO-GS-10E: M ASTER C ONVECTION O VEN - G AS S TANDARD D EPTH -( 10 )Single D ECK E LECTRONIC C[...]

2 This service manual is designed to answer questions related to model operational req uirements, troubleshoo ting and disassembly/assembly procedures. It contains electronic ignition o peration, t rouble- shooting and electronic co ntrol o perations that includ e diagnostic cod es, ladder diagrams, wire diagrams and troubleshoo ting. It also in cl[...]

3 SECTION 3 : COMPONE NT A CCESS OF FUNCTIONA L COMPONENTS ...... ......... ......... ........ .. 16 DOOR GASKET REPLA CEM ENT ....................................................................................................... ..................... 17 TO R EMO VE DOORS FROM T HE OVEN .............................................................[...]

4 GA S CONVE CTION OVEN "GA S SPECI FICA TIONS” TOTA L MA IN BURNER ORIFICE PILOT PILOT ORIFICE GA S PRES. W /C B.T.U.'S ORIFICE A MT. ORIFICE A MT. NA T PRO NA T PRO NA T PRO * ** MCO 40,000 5 / 64 ” (.0781”) #55 2 .020" .012" 1 4.5" 5.0” 10.0" MCO 60,000 5 / 64 ” (.0781”) #55 3 .020" .012" 1 4.5[...]

5 Understanding the sequenc e of operation is necessary in properly trouble-s hooting this appliance. In this s ection the sequence of operation w ill be covered first, as well as c alibration and op eration of com ponents, and bas ic trouble shooting techniques for that specific m odel. Follow each s equence carefully , and get to understand its o[...]

6 A therm oc ouple type test instrum ent is prefer red for m easuring oven temper atures ac curately. Mercury thermom eters are acceptable providing they can be proven accurate. Regardless of the ty pe instr ument used, it is m ost desirable to double-check it just bef ore m aking an oven temper ature check . This can be done sim ply and quickly by[...]

7 five tim es doubling the thicknes s with each fold. After the f ifth fold, place the therm ocouple tip in the center of the aluminum piece and fold once m ore. Finally , fold in the sides so that the f oil clings to the thermoc ouple tip. A mer cury therm om eter can be weighted in m uch the sam e way by wrapping several lay ers of alum inum foil[...]

8 ELECTRO NIC CONT ROLS - “ E” Sequence of Operation (W ith the Oven Doors Closed) 1. Line Voltage is supplied to the Mode Switch, Door Switch and the Momentary Light Switch. 2. Set Mode Switch to COO K and clos e the oven doors . Line Voltage is s ent f rom Mode Switch to power up the C ontroller and to the AUX r elay on the contr oller. W ith[...]

9 ELECTRONIC CONTROL FA ILURE CODES The G ARLAND digital control has a self -diagnostic program . If a problem occ urs within the digital c ontroller, you m ay see one of the "F" codes. Below is a li sting of the "F" codes with explanatio ns: -F1- Relay output is enabled when not cooking. If this f ailure code appears in the dis[...]

10 The contr oller needs voltage to operate and i s c apable of operating on three (3) differ ent line voltage s, 115 Vac, 208 Vac, 240 Vac. On the back of the Robertshaw COM6000 there are s everal ¼ ” male spade term inal or p in connections. T he below is a drawi ng of the rear of a Robertshaw COM6000 Controller along with a definition of each[...]

11 The Us er Pref erence Of fset is designed to enable the user to adjust the c ontrolling tem perature. T here are two different sty les of controllers used by G ARLAND at the pr esent time. T hey are the Robertshaw COM6000 and COM6700 Series. T o determ ine which of the controllers you are work ing on, look at the back of the controller and y ou [...]

12 Entry Exit UPO - User Preference Offset . Used by the user to adjust t he controlling temperature +/- 50º in 1º increments. 1. Set the time digits to 00:00. 2. Set the temperature digits to X 10º. 3. Depress & hold the Start button for f ive seconds. 4. “UPO” & Current UPO will be displayed. Turn TEMP or T IME dial to adjust. 1. D[...]

13 The saf ety lockout tim er circuit starts tim ing the m om ent the trial f or pilot ignition star ts. W hen the tim ing period runs out, the trial f or ignition ends, and the control m odule goes into lockout. Before another attem pt to start can be m ade, the S86 m ust be res et. Res et by adjusting the ther mos tat or controller or to its &quo[...]

14 and answering conditions in each box enc ountered, until a problem and/or the repair is ex plained. After any maintenance or r epair, the tr ouble s hooting s equence should be r epeated until the trouble shooting procedur e ends with a normal system operation. S86 CHECKOUT AND T ROUBLE SHOO TING STA RT NOT E: Before troubleshooting, fam iliariz[...]

15 CHECK GROUNDING A com m on ground is required f or the pilot burner, the ignitor-sensor, the GND term inal of the S86, and the m ain burner. T he m ain burner generally serves as the com m on ground. If the ground is poor or erratic, saf ety shutdowns may occur occ asionally even though operation is norm al at the tim e of the check out. T heref[...]

16 A PPEA RA NCE CA USE SMALL BLUE FLAME Check for lack of gas f rom : • Clogged orifice filter • Clogged pilot filter • Low gas supply pressure • Pilot adjustment at m inim um LAZY Y ELLOW FLAME Check for lack of air f rom : • Large orifice • Dirty lint screen, if us ed • Dirty prim ary air openi ng, if there is one • Pilot adjustm[...]

17 This se ction will give you the be st way to access compo nent for rep laceme nt. COMPONENT LOCATIONS: Top Front Center Door Chain Door Catch Right Front Control Pa nel 24v Tran sform er, Ignition modu le Redund ant gas valve Low er Front Door Micro-Switch Data Pla te, Bu rner Packa ge Inside O ven Oven Convection Motor Oven Inte rior Lights Doo[...]

18 2. Lo cate sta inless ste el door gas ket, m ounte d to o ven fron t fra me. 3. Rem ove the #10 Ph illips shee t meta l screw that a ttach t he reta iner to t he oven's f ront fram e. 4. Rem ove stainle ss steel d oor gasket. 5. Rep lace stain less stee l door gaske t and to reverse a bove proced ure to re-install. FILE NA ME JIT03418 1 2 3[...]

19 2. Remove d oor chain assem bly (NOTE: T he “A ” mode l does n ot com e equip ped with do or chain). 3. Remove f lat he ad m etal screw 1/4 ”-20x1/2”  f rom b earing retain er. 4. Push th e doo r toward hinge and lif t up. NOTE: Botto m be aring retaine r will stay in place. 5. Remove th e right doo r in the same mann er. 2 3 4 1 FILE[...]

20 1 2 3 4 7 5 7 8 6 NOTICE: DEPENDENT DOOR SHOWN 7 To d isassemb le lef t doo r: 1. Once th e doo r has b een rem oved f rom t he oven (ref er to instruction s on t he previous page), remove th e 12 t russ hea d 10 x ½ Phillips screws     . 2. Remove 2 allen h ead ca p screws fro m the door h andle     . 3. Carefu lly pry [...]

21 1 2 3 4 5 NOTIC E: DEP END ENT R IGHT HAND DOOR SHOWN . 1. Once th e doo r has b een rem oved f rom t he oven (ref er to instruction s on p age 19), remove 9 truss hea d s.m .s. 10 x ½     from the top, b ottom and left s ide (as sh own) from the d oor pa nel     . 2. Pry the do or liner     apart f rom the d[...]

22 To Replace or A djust Door Latch Mechanis m 1. Open oven doo rs. 2. Remove 2 pan h ead P hillips screws. 3. Lift door latc h mec hanism  up an d out of door assemb ly. 4. To a djust lat ch me chanism  , loosen lock nu t  & and adjust b y tightening or loo sening ad justme nt nu t. To Replace Convection Oven Motor A ssembl y (Draw in[...]

23 A ssembl y FILE NAME JIT00012 7 6 2 1 3 8 5 4 5 9 1. Assemb le  moto r moun t plate ,  * insulat ion,  moto r moun t plate inner t ogether b y fast ening f our f lat hea d m.s . 1/4-20 x2½ "  into th e f our hole s note d on t he ab ove drawings. 2. Secure e ach f lat h ead m .s. 1/4 -20x2½ "  with a fla t washer  a[...]

24 Main B urner, Pilo t Burne r Rem oval & Doo r Micr o Sw i tch Loc ation 1 2 3 4 To a ccess the Burne rs, Pilot or Do or Switch - rem ove the lo wer combust ion cha mber, (not sho w). This e xposes the se com pone nts, also you will note th at the rating or da ta plat e is on the insid e of the co mbust ion shrou d. For ovens th at are 80,00 [...]

25 SECTION 4: - C OMMO N W IRE D IA GRA MS[...]

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