Middleby Marshall PS640 User Manual

Page 23

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19

F.

Adjusting the Minimum Pressure Setting

1.

Disconnect pressure feedback connection (if appcable).

2.

Connect a suitable pressure gauge to pipe line or to outlet
pressure tap of gas control concerned, to measure burner
pressure (measuring point must be as near to burner as
possible).

3.

Disconnect electrical connection of the Moduplus

®

.

4.

Energize operator, set control in operation and wait until
an outlet pressure is recorded on pressure gauge.

5.

If minimum rate pressure needs adjustment, use an 8 mm
wrench to turn adjustment screw for minimum pressure
setting (clockwise to increase or counter-clockwise to
decrease pressure), until the desired minimum outlet
pressure is obtained.

6.

Check if main burner lights easily and reliable at minimum
pressure.

7.

Reconnect pressure feedback connection (if appcable).

8.

Close pressure tap screw.

G.

Checkout

After any adjustment, set appliance in operation and observe
through a component cycle to ensure that burner system
components function correctly.

NOTE: The installer MUST verify oven operation prior to

putting oven into service.

H.

Maintenance

It is recommended to check yearly the minimum and the
maximum setting and readjust them if necessary.

Gas

Valve

Main•

Pressure•

Tap

Gas Burner

Assembly

Main•

Orifices

Figure 2-20. Burner Assembly

Figure 2-21. Gas Valve

Adjustment Screw (5 mm)

for minimum pressure

setting

Adjustment Screw

(8 mm) for

maximum

pressure

setting

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