Middleby Marshall PS220, PS570 TABLE OF CONTENTS continued, Instructions for Service Kit, Blowers

TABLE OF CONTENTS (continued)

III.	High Limit Control Module			45
	A.	Part Number Reference - High Limit Control Modules		45
	B.	Location		45
	C.	Troubleshooting		45
	D.	Appendices		46
		•	Instructions for Service Kit 39733 -
			High Limit Conversion Kit for PS300, 310,
			350 & 360 Ovens, 5/99	46
IV.	Thermocouples			54
	A.	Part Number Reference - Thermocouples		54
	B.	Thermocouple Functions		54
	C.	Troubleshooting		54
	D.	Appendices		56

•Instructions for Service Kits 33984 and 33985 -

		Oven Thermocouple Kit, 11/01	56
V.	Blowers		68
	A.	PS200-series ovens	68
	B.	PS360-series ovens	74
	C.	PS555/570-series ovens	76
VI.	Blower Motor Centrifugal Safety Switch (PS360-series)		80
	A.	Part Number Reference - Blower Centrifugal Switch	80
	B.	Troubleshooting	80
VII.	Burner Blower Motor Centrifugal Safety Switch (PS200-
	series gas, PS310, PS314, PS360, PS360WB, PS570S)		80
VIII. Air Pressure Safety Switch (PS200-series, PS555/570-
	series, PS360EWB, PS360WB70)		81
	A.	Part Number Reference - Air Switches	81
	B.	Troubleshooting	82
	C.	Appendices	83

•Instructions for Service Kits 35624 and 35625 -

Air Pressure Switch Replacement Kits, 1/97 83

•Instructions to Replace an “Alternate” Air Switch

		P/N 36194 with Service Kit P/N 35624, 3/97	85
IX.	PS570/570S Flame Gate		87
	A.	Part Number Reference - Flame Gate	87
	B.	Flame Gate Orientation	87
X.	Gas Train and Burner System		88
	A.	Part Number Reference - Gas Train Components	88

B.Part Number Reference - Gas Orifices and Gas

	Conversion Kits	91
C.	Component Identification	92
D.	Pilot/Ignitor Assembly	93
E.	Burner Blower Motor	95
F.	Air Shutter	95
G.	Burner Transformer	96
H.	Burner Motor Relay	96
I.	High Flame Solenoid Valve	96
J.	Bypass (Low Flame) Orifice	96
K.	Modulating Gas Valve	97
L.	Amplifier Board	97
M.	Combination Gas Control Valve	98
N.	Ignition Module	99
O.	Gas Conversion Kits	100
P.	Burner and Gas Train Troubleshooting	100
Q.	Checking the Gas Pressures	102

R. Troubleshooting Flowcharts 103

•Intermittent Pilot System Troubleshooting Table 103

•	No Spark, System Does Not Work	104
•	Spark is Present, Pilot Will Not Light	105
•	Pilot Lights, Main Valve Will Not Come On	106
S. Appendices		107

•Instructions for Service Kit 42810-0117 -

Pilot/Ignitor Kit, 7/91 107

•Instructions for Service Kit 30185 - Pilot Tee, 3/94 . 108

•Instructions for Service Kit 42810-0121 -

Combination Gas Valve, 1/92 112

•Instructions for Service Kit 42810-0114 -

Ignition Module, 11/90 116

•Position of Combination Gas Valve Components

during Burner Operation, 4/02 118

•Instructions for All Gas Conversion Kits

for Ovens with Wayne Burner, Natural Gas to

Propane, 8/00 119

•Instructions for All Gas Conversion Kits for Ovens with Wayne Burner, Propane to

Natural Gas, 8/00 125

• Instructions for Service Kit 36856 - Gas
Conversion Kit for PS360EWB/WB70 with
Midco Burner, Natural Gas to Propane, 1/98	131

• Instructions for Service Kit 36863 - Gas
Conversion Kit for PS360EWB/WB70 with
Midco Burner, Propane to Natural Gas, 1/98	135

•Equivalent Orifice Sizes at High Altitudes, 4/02 . 139

XI.	Electric Oven Heating System		140
	A.	PS200-series ovens	140
	B.	PS310/360-series ovens	142
	C.	PS555 ovens	144
	D. Electric Oven Mercury Contactor Replacement		146
Section 4 - Electrical Wiring Diagrams			149
I.	Component Wiring		149
	A.	Temperature Controllers	149
	B.	Ignition Modules	150
II.	PS200-series Ovens		151
III.	PS310/360-series Ovens		160
IV.	PS555/570-series Ovens		166
Section 5 - Reference			172
•	25-point preventative maintenance checklist		172
•	Fractional inches to decimal and millimeter equivalents ...		173
•	Decimal equivalents of drill sizes		173
•	General conversion factors		174
•	Pressure conversions		174
•	Pressure conversion chart		175
•	Ohm’s Law equation wheel		175
•	Common electrical wiring diagram symbols		176

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