Middleby Marshall PS740 Series Gas Ovens P/N 60250 - Manual (Page 23)

19 P/N 60250 September 28, 2012
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 a 5 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 com-
ponents function correctly.
NOTE: The installer MUST verify oven operation prior to put-
ting oven into service.
H. Maintenance
It is recommended to check yearly the minimum and the maxi-
mum setting and readjust them if necessary.
Figure 2-20. Burner Assembly
Figure 2-21. Gas Valve
Adjustment Screw (5 mm)
for minimum pressure
setting
Adjustment Screw
(8 mm) for maxi-
mum
pressure
setting