Middleby Marshall Welding Consumables PS360EWB User Manual

Middleby  
®
Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • (847)741-3300 • FAX (847)741-4406  
Marshall  
Oven Gas Conversion Kit p/n 36856  
PS360EWB and PS360WB70  
Natural Gas to Propane Installation Instructions  
WARNING  
This conversion kit is to be installed by a Middleby Marshall Authorized Service Organization in accordance with  
the manufacturer’s instructions and all codes and requirements of the authority having jurisdiction. Failure to  
follow instructions could result in serious injury or property damage. The authorized service organization  
performing this work assumes responsibility for this conversion.  
This kit consists of the following parts:  
Qty.  
Units p/n  
Description  
1
ea.  
36857  
Instructions for Conversion of Natural Gas Operation to Propane Operation, PS360EWB and  
PS360WB70  
1
1
1
1
1
ea.  
ea.  
ea.  
ea.  
ea.  
31819  
Orifice, Pilot Assembly - Propane, 0.025” (0.64mm)  
Orifice, Main - Propane, 0.185” (4.70mm)  
31822  
22174-0009  
22500-0065  
22500-0123  
Orifice, Low Flame - Propane, 0.034” (0.86mm, #62 drill) - used for converting PS360WB70 only  
Label, LPG, Red  
Label, Conversion - Gas  
IMPORTANT  
When converting any oven that is installed at an altitude above 5000 ft. (1524m), consult Middleby before installing  
this Kit.  
1. PREPARATION  
1.1 Turn off the electric power supply to the oven.  
1.2 Turn off the gas supply at the service valve behind the oven.  
WARNING  
Before performing any service or conversion work, the electrical power supply AND the gas supply MUST be  
turned off.  
1.3 Open the machinery compartment access door.  
2. PILOT ORIFICE REPLACEMENT  
2.1 Unscrew the brass fittings at both ends of the aluminum pilot tubing that connects the pilot orifice to the combination gas control  
valve. This allows the tubing to be removed. See Figure 1.  
Figure 1  
Conversion component locations  
Solenoid valve  
(PS360WB70 only)  
Main  
orifice  
holder  
Low flame bypass  
(PS360WB70 only)  
Combination gas  
control valve  
Pilot  
orifice  
Aluminum  
pilot tubing  
p/n 36857  
P. Jan 98 Rev. B  
Page 1 of 4  
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6. INLET PRESSURE CHECK  
6.1 Check the gas control inlet pressure at the inlet pressure tap. See Figure 6. An inlet pressure of 6-14” (14.9-34.9mbar) is  
recommended for propane operation.  
6.2 If the inlet pressure is:  
HIGHER THAN 14” W. C. (34.9mbar) - This pressure may damage the combination gas control valve. Decrease the supplied  
gas pressure.  
LOWER THAN 3” W. C. (7.46mbar) - It may be necessary to increase the supplied gas pressure.  
If it is necessary to adjust the gas line pressure, have the customer contact the gas utility supplier.  
7. PILOT PRESSURE ADJUSTMENT  
7.1 Ensure that the air supply is properly adjusted for propane operation.  
Units with a burner blower air shutter (see Figure 5) should have the shutter opening (at its outside edge) set to 5/16”  
(7.94mm). A drill bit can be used to check the adjustment of this opening.  
Units without the air shutter (see Figure 5) should have the burner air supply adjustment screw turned 11-17 full revolutions  
clockwise from the fully closed (counterclockwise) position. The screw is located on the front wall of the burner plenum, and  
is surrounded by a “MORE AIR” label.  
Figure 5  
Burner blower configurations  
Insert a 5/16”  
(7.94mm) drill  
bit to measure  
opening  
Blowers without  
external air shutter  
(remove before  
operation)  
External  
air  
OR  
shutter  
7.2 Before proceeding:  
For a PS360EWB oven, the set point should be reduced  
below the room temperature.  
Figure 6  
For a PS360WB70 oven, set the oven to low flame.  
Gas pressure measurement/adjustment locations  
7.3 Measure the pilot pressure at the pilot pressure tap, as shown  
in Figure 6. The gas pressure should be 5-6” W. C. (12.5-  
14.9mbar) for proper operation.  
Pressure  
regulator cap  
screw  
Pilot tube  
connects  
here  
7.4 If necessary, adjust the pilot pressure as follows:  
Remove the pilot adjustment cap screw.  
Using a screwdriver, turn the inner adjustment screw  
counterclockwise to increase, or clockwise to decrease,  
the pilot gas pressure.  
Pilot  
adjustment  
cap screw  
Replace the cap screw and tighten it firmly.  
Inlet pressure  
tap  
7.5 Measure the current across the pilot flame sensor. The  
current must measure at least 2.0 µA. If the current reading  
is too low, recheck the pilot pressure as per Step 7.3. If the  
pressure reading is correct, consult the factory; otherwise,  
repeat Steps 7.4 and 7.5.  
Main orifice  
pressure tap  
8. MAIN MANIFOLD PRESSURE ADJUSTMENT  
8.1 With the oven set to high flame, measure the regulated gas  
pressure to the burner. The outlet pressure should be  
checked at the main orifice pressure tap. See Figure 6.  
The gas pressure should be 3” W. C. (7.46mbar) for proper  
operation.  
Pilot pressure  
tap  
8.2 If necessary, adjust the pressure regulator as follows:  
Remove the pressure regulator cap screw.  
Using a screwdriver, turn the inner adjustment screw clockwise to increase, or counterclockwise to decrease, the main  
burner gas pressure.  
Replace the cap screw and tighten it firmly.  
8.3 Record the final measured regulated gas pressure on the silver conversion information label (included in the kit).  
p/n 36857  
P. Jan 98 Rev. B  
Page 3 of 4  
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9. CONVERSION LABELING  
Figure 7  
Red “LPG.” label placement  
9.1 Remove and discard the round, green “NAT.” label from the  
(on burner housing)  
front face of the burner plenum.  
9.2 Apply the round, red “LPG.” label (p/n 22500-0065) to the front  
face of the burner housing as shown in Figure 7.  
9.3 Close the machinery compartment access door.  
9.4 Record the information requested on the silver conversion  
information label. Figure 8 shows a representation of this label.  
9.5 Apply the conversion information label to the front of the  
machinery compartment access door, next to the control panel.  
See Figure 9.  
Upper oven  
label location  
Lower oven  
label location  
Figure 8  
Conversion information label  
Signature of technician  
performing conversion  
Date of conversion  
PROPANE  
THIS APPLIANCE HAS BEEN CONVERTED ON _______________ TO ______________ GAS WITH KIT  
36856  
NO. ________________ BY _______________ , WHO ACCEPTS THE RESPONSIBILITY FOR  
THE CORRECTNESS OF THIS CONVERSION.  
.185”/ 4.70mm  
MODEL NO.  
MAIN BURNER ORIFICE SIZE  
175,000 BTU  
MANIFOLD PRESSURE  
14” W.C./ 34.9mbar  
INPUT RATING  
MAXIMUM INLET PRESSURES  
Measured value  
recorded in Step 8.3  
Stated on the  
oven’s data plate  
Figure 9  
Conversion information label placement  
THIS APPLIANCE HAS BEEN CONVERTED ON _______________ TO ______________ GAS WITH KIT  
NO. ________________ BY _______________  
,
WHO ACCEPTS THE RESPONSIBILITY FOR  
THE CORRECTNESS OF THIS CONVERSION.  
MODEL NO.  
MAIN BURNER ORIFICE SIZE  
MANIFOLD PRESSURE  
INPUT RATING  
MAXIMUM INLET PRESSURES  
PS360EWB placement  
THIS APPLIANCE HAS BEEN CONVERTED ON _______________ TO ______________ GAS WITH KIT  
NO. ________________ BY _______________ WHO ACCEPTS THE RESPONSIBILITY FOR  
,
THE CORRECTNESS OF THIS CONVERSION.  
MODEL NO.  
MAIN BURNER ORIFICE SIZE  
MANIFOLD PRESSURE  
INPUT RATING  
MAXIMUM INLET PRESSURES  
PS360WB70 placement  
Page 4 of 4  
P. Jan 98 Rev. B  
Download from Www.Somanuals.com. All Manuals Search And Download.  
p/n 36857  

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