Wood Stone MOUNTAIN HOME MH-4 Service Manual Download Page 1

Page: 1 / 56

Toll Free 800.988.8103
Tel 360.650.1111
Fax 360.650.1166

www.woodstone-corp.com

WOOD STONE CORPORATION

1801 W. Bakerview Rd.
Bellingham, WA 98226 USA

MOUNTAIN SERIES

Commercial & Residential Stone Hearth Oven

Gas-Fired, Wood-Fired and

Gas/Wood Combination Models

MOUNTAIN SERIES

WS-MS-(4, 5, 6, 7)

MOUNTAIN HOME

WS-MH-(4, 5)

TRADITIONAL SERIES

WS-TS-(5,6)

DOC NO

M0014.09

REVISED

APRIL 2019

Service Manual

Summary of Contents for MOUNTAIN HOME MH-4

Page 1: ...PORATION 1801 W Bakerview Rd Bellingham WA 98226 USA MOUNTAIN SERIES Commercial Residential Stone Hearth Oven Gas Fired Wood Fired and Gas Wood Combination Models MOUNTAIN SERIES WS MS 4 5 6 7 MOUNTAIN HOME WS MH 4 5 TRADITIONAL SERIES WS TS 5 6 DOC NO M0014 09 REVISED APRIL 2019 Service Manual ...

Page 2: ...ens 3 Before You Begin 4 Product Overview 5 Venting 6 Wood Fired Oven Overview 7 Wood Oven Troubleshooting 8 Electrical Diagram Wood 9 Gas Oven Overview 10 Operational Overview Gas 11 OPERATIONAL SEQUENCE W IR 12 RFG 13 RFG IR 14 Legacy 15 Gas Oven Components 16 Oven Controllers 17 Gas System Components 20 Gas Oven Troubleshooting 22 Burner Troubleshooting 30 IR Burner Troubleshooting 34 Common Re...

Page 3: ...OD STONE OVEN SERVICE MANUAL FOR GAS FIRED AND WOOD FIRED MOUNTAIN SERIES OVENS FOR WS MS 4 5 6 AND 7 MODELS TS 5 6 MODELS ADDITIONAL COPIES AVAILABLE UPON REQUEST This manual is for use only by qualified service personnel It is recommended that this oven be installed maintained and serviced by qualified professionals Warning Improper installation adjustment alteration service or maintenance can r...

Page 4: ...ting to install or perform any kind of service on this equipment BE SAFE SERVICE DEPARTMENT AND WARRANTY INFORMATION If you have any questions please call the Wood Stone Service Dept at 1 800 988 8103 Normal hours are 8 a m to 5p m Pacific Standard Time Monday through Friday After hours and on weekends call and follow the instructions to leave a message on the emergency service voice mail A Wood S...

Page 5: ...e Height Control Knob to raise and lower the flame to control the oven temperature RFG IR MODELS These models have a Radiant flame burner as well as a thermostatically controlled Underfloor Infrared IR burner The Radiant burner is the main heat source in this oven This burner is designed to give the appearance of a wood fire type flame The burner runs continuously when the oven is turned on The ov...

Page 6: ...w is a brief overview OVEN VENTING The Wood Stone Mountain Series ovens may be installed under a hood or direct connected All ductwork must be constructed and installed to the specifications of a grease duct If a hood is used it must be a Type 1 hood grease rated A power ventilator listed for restaurant exhaust applications must be provided If fire suppression is required by the local jurisdiction...

Page 7: ...rical components on the wood fired ovens are in the Temperature Readout Display at the front of the oven Be aware that these displays are often relocated to an area beside the oven to accomodate kitchen design requirements The assembly is made up of three components 1 A Thermocouple that is installed into the floor of the oven from below 2 A Temperature Readout Assembly with settings adjustable be...

Page 8: ...itive If the connections are good remove the Thermocouple wires from the display Jumper between TC and TC on the display the display should show the ambient temperature If it does not display the ambient temperature replace the readout If the readout displays the ambient temperature when jumpered replace the Thermocouple Note Some models may include a plug connection between the readout box and th...

Page 9: ...one corp com woodstone corp com ELECTRICAL DIAGRAM WOOD Solid Fuel Only DATE DIAG WD051 Rev 0 3 27 2014 Bellingham WA 1 360 650 1111 www woodstone corp com Thermocouple Readout 12 VAC Yellow Red GND XFMR 110 120 VAC 50 60Hz wired by others Type K Thermocouple Probe Solid Fuel Only EM 2V DATE DIAG WD052 Rev 0 3 27 2014 Bellingham WA 1 360 650 1111 www woodstone corp com Thermocouple Readout 12 VAC ...

Page 10: ...ifications without notice WOOD STONE CORPORATION 1801 W Bakerview Rd Bellingham WA 98226 USA TOLL FREE 800 988 8103 TEL 360 650 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com GAS OVEN OVERVIEW GAS OVENS OPERATIONAL OVERVIEW AND COMPONENTS RFG IR IR and Radiant burner Radiant burner only RFG IR burner only W IR ...

Page 11: ...burner is designed to assist in initial heat up and during periods of high production W IR MODELS These are wood fired models with a thermostatically controlled Underfloor Infrared IR burner The wood fire is the main heat source The IR burner is designed to assist in initial heat up and during periods of high production Gas fired ovens that include a W in the model number are configured to allow t...

Page 12: ...t fails to light The valve will remain powered and the Igniter will remain on indefinitely until the pilot lights or power is turned off BURNER OPERATION SEQUENCE W IR OVEN TYPE 2 CONTROLLER Floor temperature below Hearth Set Point Controller sends power to SV 1 valve SV 1 powers Igniter and opens Pilot valve Pilot does not light SV 1 times out Controller will flash chec Power on Floor temperature...

Page 13: ... a round ON OFF control knob instead of a slide switch the valve will not time out if the pilot fails to light The valve will remain powered and the Igniter will remain on indefinitely until the pilot lights or power is turned off BURNER OPERATION SEQUENCE RFG OVEN ALL CONTROLLERS Power on Pilot lights SV 2 senses Pilot Flame turns Igniter off SV 2 opens Burner lights Amber light comes on or on to...

Page 14: ...ghts or power is turned off Power on Pilot lights Pilot does not light SV 2 times out SV 2 valve powers Igniter and opens Pilot valve to Radiant rear burner SV 2 senses Pilot Flame Igniter off SV 2 opens Burner lights Dome Flame Indicator light comes on Floor reaches the Hearth Set Point temperature Controller turns off power to SV 1 to turn off Underfloor IR Burner Pilot does not light SV 1 times...

Page 15: ... Amber Dome Flame indicator light comes on Radiant burner remains on until oven is turned off Floor Temperature above Hearth Set Point No action Floor Temperature below Hearth Set Point Controller sends power to SV 1 SV 1 powers Igniter and opens Pilot Valve Pilot does not light SV 1 times out Pilot lights SV 1 senses Pilot Flame Igniter off Red Hearth Heat indicator light comes on SV 1 opens Burn...

Page 16: ...k stand It consists of one of the two types of Transformers and a Junction Box All wiring within this 4x4 Junction Box is low voltage It allows easy voltage testing to various oven components for troubleshooting All wiring harnesses and the Thermocouple are routed through terminal strips within this box Do not alter any wiring within this box or on the oven Under no circumstances is high voltage 1...

Page 17: ...ed Hearth Set Point using the UP OR DOWN ARROWS when the desired Hearth Set Point is reached press the PROG button again to lock in the new temperature There are actually two slightly different versions of this Temperature Control Module One will have NCC National Controls Corporation written on the front and the right most button reads TEMP ADV The second version reads Wood Stone Corp on the fron...

Page 18: ...is a touch pad overlay with a Hearth Temperature display and depending on the oven model a Hearth Set Point display and Dome flame and Hearth Heat indicator lights RFG CONTROLLER LEGACY This Controller is found on the RFG type ovens manufactured prior to March of 2000 and on previously installed ovens that have been converted from wood fired only W to RFG gas by Wood Stone Ovens built after March ...

Page 19: ... by 12 VAC coming from a tap on the ACME Transformer This display is lit whenever incoming power is supplied to the oven regardless of whether the oven is turned ON or not Just below this display is a red Over Temperature light This light indicates that the over temperature module located in the junction box on the Transformer Plate has tripped and shut off 24 VAC power to the relay and start swit...

Page 20: ...e pressure exceeds 14 W C RADIANT BURNER ASSEMBLY This is the burner typically located at the rear of the oven and produces the flames visible inside the dome but may also be located on one or both sides It consists of a stainless steel burner housing a cast iron burner manifold the burner jets and the Flame Retention Springs that are attached to each jet There is an opening in the burner housing ...

Page 21: ...ough the gap next to the pilot assembly and you should see a reddish glow over the ceramic burner elements This burner operates only when the hearth temperature is lower than the Controller s Hearth Set Point THERMOCOUPLE A Type K Thermocouple is used to sense the temperature of the oven floor hearth about 1 inch beneath the hearth surface It is located slightly to the rear of the center of the ov...

Page 22: ...dstone corp com GAS OVEN TROUBLESHOOTING GAS OVEN TROUBLESHOOTING CONTROLLERS The Type 1 Controller is most easily identified by a large red button and a large green button on the face of the stainless steel Controller housing In the center there will be a gray touch pad that says Temperature Controller You will also see either two or three indicator lights across the top Additional information ca...

Page 23: ...r If 120 VAC present Check for loose wires and replace Transformer if necessary 4 If voltage present between pink and white wires in Control Box verify that ice cube relay is seated in its socket If oven still does not come on check that the NO and NC start and stop switches are functioning correctly Verify that all wiring connections to the switches relay socket and terminal block are good If thi...

Page 24: ...er the oven that pulls the heat from the IR back onto the wiring This needs to be corrected 2 Operational Problem Call Wood Stone Product is cooking inconsistently under and or over The gray label on the Controller says NCC not Wood Stone Controller is calling for heat and IR is running and floor temperature is above the Hearth Set Point Floor temperature is more than two degrees below the Hearth ...

Page 25: ...ative airflow beneath the oven that pulls the heat from the IR back onto the Thermocouple wire This should be corrected call Wood Stone Oven does not turn on control is blank 1 Is the breaker and or wall switch supplying power to the oven ON 2 Is the circuit breaker on the 24 V Transformer tripped The Transformer is located in the rear most junction box located on the Transformer Plate beneath the...

Page 26: ...ght flashes Controller is fine It is indicating that the Controller called for IR heat but the IR burner did not fire within the time allowed by the Controller See Radiant and Infrared Burner Troubleshooting section of this manual Temperature display scrambles and or is erratic may precede the Transformer circuit breaker tripping Display is fine but the Transformer circuit breaker trips instantly ...

Page 27: ...ire in the control harness Product is overcooking or undercooking Oven does not turn on Controller is blank 1 Is the breaker and or wall switch supplying power to the oven on 2 Is the circuit breaker on the 24 V Transformer tripped The Transformer is located in the rear most junction box located on the Transformer Plate beneath the oven in the front on the right side If the breaker on the Transfor...

Page 28: ...pplied to the oven Temperature Readout is lit but no green power on light and oven is not turning on NOTE There is no power ON light on the 8 Foot RFG Controllers Verify that 24 V is being supplied to the Controller pink and white wires If 24 V is not present find bad wire connection If 24 V is present check that the rubber boot on the stop switch has not caused the switch to remain depressed Chec...

Page 29: ...rge and then 30 seconds with the glow coil again Pilot gas will flow for the entire 90 second trial The system will then lockout and retry after 5 minutes Flame rectification is sensed through the Flame Rod on the Pilot Igniter to ground via the Pilot Tube No burners are lighting none of the 3 indicator lights across the top of the Controller are lit The red light below the temperature readout is ...

Page 30: ... be traced to debris in the burner See the Common Repair Procedures section of this manual 1 Wire connections at the SV 2 Gas Valve are loose or unplugged Verify that the MOLEX connectors for the SV 2 wire harness and the Igniter wires are securely plugged into the Gas Valve Make sure that the pins are locked into the connector body 2 Moisture If the valve has gotten wet replace it Also the Pilot ...

Page 31: ...onds turn it off and back on again it may still be necessary to do this a few times DO NOT LEAVE THE OVEN UNATTENDED WHILE THE INLET PLUG IS REMOVED FROM THE Gas Valve 3 Verify that the switch on the Gas Valve is in the ON position The valve will power the Igniter even if the switch is in the OFF position 4 Check for loose wire connections at the SV 2 Gas Valve Verify that the MOLEX connectors for...

Page 32: ...ck the screw out to just beyond the point where the pilot relights 5 Excessive airflow from beneath the oven causing the Pilot Flame to lift away from the Flame Rod Correct the airflow problem and make sure the Igniter gasket is in place Ideally there should be no discernible draft below the oven Make sure Pilot Igniter gasket is in place 6 Defective Pilot Igniter replace If the burner is still go...

Page 33: ...d the Igniter wires are burned 1 Loose Pilot Tube tighten and replace Igniter 2 Inadequate venting or negative air see oven installation instructions Pilot Orifice is damaged or missing Remove Pilot Igniter Orifice fits between the brass compression fitting attaching the Pilot Tube and the Igniter body Replace with new Pilot Orifice Flame Height Control Knob throttle difficult to turn Radiant flam...

Page 34: ...yle Controller see Controllers section of this manual the IR burner will not light until the Controller has verification that the Radiant burner has lit If the Radiant burner is running and the Controller is calling for IR heat it will allow the IR burner 90 seconds to light If the burner has not lit after this time the Controller will flash check Turn the oven off and then back on to reset 1 If t...

Page 35: ...gniter If problem recurs replace Gas Valve Burner will not light or shuts off sometimes and the Igniter wires are burned 1 Loose Pilot Tube tighten and replace Igniter 2 Inadequate oven venting or negative air pressure See Installation and Operation Manual instructions Contact Wood Stone for further assistance W IR RFG IR W MODELS IR burner does not come on NOTE On Type 1 Controllers the red heat ...

Page 36: ...y supply piping issues Use of flex piping to supply gas to the oven is discouraged The specified pressure for each burner may be found on the Equipment Data Plate located beneath the oven REMOVAL AND CLEANING OF RADIANT BURNER This procedure may be performed while the oven is hot We strongly recommend that the technician wear heat protective gloves and safety glasses goggles when removing the burn...

Page 37: ... aware of the Pilot Orifice located between the brass compression fitting and the Igniter The Igniter is attached to the Burner Can with a right angle bracket Remove the screw holding the bracket to the Burner Can and remove the Igniter Remove the bracket from the old Igniter Attach the bracket to the new Igniter and reinstall Whenever you are removing or replacing the Radiant burner Igniter you s...

Page 38: ... nut to compress the fitting on to the Thermocouple Again make certain the Thermocouple is properly located before tightening the nut as it will be impossible to relocate once the nut is tightened NOTE On models equipped with the Underfloor IR burner the end of the Thermocouple will need to be bent slightly at the tip toward the Infrared Burner to fit into the floor casting 8 Attach the wire end o...

Page 39: ... 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com GAS COMPONENT DIAGRAMS PIPING AND RADIANT BURNER Control Rod w Cotter Key Control rod bracket Throttle Valve Flex Piping to SV 1 and IR Burner if equipped SV 2 Valve Thermocouple Radiant Burner Assembly Pilot Igniter 3 4 Gas Connection Pilot Tube Pressure Tap Conduit for SV 2 harness and Thermocouple Burner Jets w Flame Reten...

Page 40: ...USA TOLL FREE 800 988 8103 TEL 360 650 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com GAS COMPONENT DIAGRAMS To IR Burner SV 2 Gas Valve Throttle valve Flame Height Control Knob To Radiant burner Throttle Rod Extension Throttle Valve Cotter Key Clamp Bracket Flame Height Control Knob RFG MODELS PIPING LAYOUT Note Actual layouts may vary depending on the model and specific ...

Page 41: ...IL info woodstone corp com woodstone corp com GAS COMPONENT DIAGRAMS Pilot Igniter Radiant Burner Assembly Pilot Tube Pilot Tube Throttle Valve Burner jets w Flame Retention Springs 3 4 Gas Connection SV 1 Valve Control Rod SV 2 Valve Flexible Gas Pipe to Radiant Burner Flexible Gas Pipe to IR Burner Infrared IR Burner RFG IR MODELS PIPING LAYOUT Note Actual layouts may vary depending on the model...

Page 42: ...without notice WOOD STONE CORPORATION 1801 W Bakerview Rd Bellingham WA 98226 USA TOLL FREE 800 988 8103 TEL 360 650 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com GAS COMPONENT DIAGRAMS INFRARED BURNER Burner Tiles Pressure Tap Venturi Tubes Burner Jets SV 1 Gas Valve Connection to Flex Piping Pilot Igniter Pilot Tubing ...

Page 43: ...ECTRICAL DIAGRAMS IR Only W IR DATE DIAG WD061 Rev 0 3 28 2014 Bellingham WA 1 360 650 1111 www woodstone corp com TB3 2 6 4 4 5 TB4 R Y 8 8 P TB1 2 TB1 6 TB1 4 TB1 5 TB1 R TB1 Y TB1 8 XFMR XFMR Thermo Couple TB1 P Infrared SV1 Thermo Couple Temperature Controller TB1 Control Panel Type 2 Red Yellow 2 red 5 orange P pink 8 white 4 brown 6 yellow TB4 R TB4 Y TB3 2 TB3 5 TB4 P TB4 8 TB3 4 TB3 6 gree...

Page 44: ... 6 green GND TB A L N G CB 4A GND XFMR 110 120 VAC 50 60Hz wired by others TB4 8 TB4 P Radiant SV2 White Brown Orange Brown 100 120 VAC RFG IR OVENS TYPE 2 CONTROLLER IR w RFG DATE DIAG WD064 Rev 0 3 28 2014 Bellingham WA 1 360 650 1111 www woodstone corp com TB3 2 6 4 4 5 TB4 R Y 8 8 P TB1 2 TB1 6 TB1 4 TB1 5 TB1 R TB1 Y TB1 8 XFMR XFMR Thermo Couple TB1 P Infrared SV1 Thermo Couple Temperature C...

Page 45: ...PG 45 OF 56 M0014 09 APRIL 2019 Mountain Series Service Manual ELECTRICAL DIAGRAMS 220 240 VAC RFG OVENS TYPE 2 CONTROLLER EXPORT MODELS 220 240 VAC RFG IR OVENS TYPE 2 CONTROLLER EXPORT MODELS ...

Page 46: ...uct improvement may require us to change specifications without notice WOOD STONE CORPORATION 1801 W Bakerview Rd Bellingham WA 98226 USA TOLL FREE 800 988 8103 TEL 360 650 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com ELECTRICAL DIAGRAMS RFG OVEN TYPE 4 CONTROLLER ...

Page 47: ...change specifications without notice WOOD STONE CORPORATION 1801 W Bakerview Rd Bellingham WA 98226 USA TOLL FREE 800 988 8103 TEL 360 650 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com ELECTRICAL DIAGRAMS RFG CONTROLLER NON TOUCHPAD STYLE USED ON PRE MARCH 2000 RFG OVENS AND SOME FIELD CONVERSIONS ...

Page 48: ...ct improvement may require us to change specifications without notice WOOD STONE CORPORATION 1801 W Bakerview Rd Bellingham WA 98226 USA TOLL FREE 800 988 8103 TEL 360 650 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com ELECTRICAL DIAGRAMS W IR OVEN TYPE 1 CONTROLLER ...

Page 49: ...t improvement may require us to change specifications without notice WOOD STONE CORPORATION 1801 W Bakerview Rd Bellingham WA 98226 USA TOLL FREE 800 988 8103 TEL 360 650 1111 FAX 360 650 1166 E MAIL info woodstone corp com woodstone corp com ELECTRICAL DIAGRAMS RFG IR OVEN TYPE 1 CONTROLLER ...

Page 50: ...d Stone IR Burner Jet NG Call Wood Stone Radiant burner Jet LP Call Wood Stone Radiant burner Jet NG Call Wood Stone Flame Retention Spring RP 0017 Throttle Flame Height Control Valve NG 7000 0182 Throttle Flame Height Control Valve LP 7000 0183 LP Valve Conversion Kit 7000 0747 NG Valve Conversion Kit 7000 0747 NG PARTS LIST All information subject to change Please contact Wood Stone to confirm p...

Page 51: ...een Type 1 Controller RP 7000 0714 IR Lamp red Type 1 Controller RP 7000 0715 Radiant Lamp amber Type 1 Controller RP 7000 0740 Non Touchpad Control RFG Ovens RP 7000 0732 Description Part Number Control Circuit Board for Type 2 Controller 7000 0099 RFG IR Keypad Overlay for Type 2 Controller 7000 0900 W IR Keypad Overlay for Type 2 Controller 7000 0901 RFG Keypad Overlay for Type 2 Controller 700...

Page 52: ...ance service agencies Maximum inlet gas pressure must not exceed 14 W C 1 2 psi GAS INLET PRESSURE For ovens running on natural gas an inlet pressure of 7 to 10 W C is recommended to ensure optimum oven performance Incoming gas pressure below this range will affect oven performance the lower the pressure the greater the negative impact If the gas supply pressure is greater than 14 W C 1 2 psi an e...

Page 53: ...SARY PARTS TO CARRY OUT THIS PROCEDURE This procedure entails changing the Burner Jets Pilot Orifices and Gas Valve Regulator Springs and adjusting the Burner Manifold Pressures as specified for the new gas type Model SV 1 SV 2 RFG IR BTU hr Input Rate RFG BTU hr Input Rate W IR BTU hr Input Rate WS MS 4 NG 3 5 5 115 000 68 000 47 000 WS MS 5 NG 3 5 4 75 188 000 105 000 83 000 WS MS 6 NG 3 5 4 75 ...

Page 54: ...llowing Wire the installation in such a way that incoming 120 VAC power to the oven is supplied only when the exhaust fan is turned on The easiest way to do this is to have the same switch that turns on the exhaust fan also turn on the power supplying the oven A qualified electrician should do this Do not attempt to wire into the oven Control Box or low voltage junction box ADDING TO OR ALTERING A...

Page 55: ...one 10 Verify all Controller functions working correctly Done 11 Visually inspect Igniter Wires and Wiring Harnesses for damage Done 12 Check Pilot Igniter Mounting Screws are tight Verify tightness of Pilot Tubes and check for Leaks Done 13 Leak check all Gas Fittings including incoming gas connection Done 14 Check tightness of Burner Mounting Bolts and Screws Done 15 Verify all Leg Bolts Nuts X ...

Page 56: ...nd contraction stress relief in the ceramic firebox 8 In the event that pressed log products of any type have been burned in the equipment 9 Damage resulting from the use of chemical cleaning products in the oven as well as any damage from liquids or chemicals including water being poured or sprayed into the oven If any oral statements have been made regarding this appliance such statements do not...

Search results

Summary of Contents for MOUNTAIN HOME MH-4

Reviews:

Related manuals for MOUNTAIN HOME MH-4

Brands by name

Popular brands

Wood Stone MOUNTAIN HOME MH-4, Service Manual

Search results

Summary of Contents for MOUNTAIN HOME MH-4

Reviews:

Related manuals for MOUNTAIN HOME MH-4

Brands by name

Popular brands