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Type
Allowable Valve Seat Leak-
age up to 7 PSI inlet
Air
# of Bubbles in 10
s Natural Gas
LP
DMV D(LE) 701/622
239 cc/hr
5
6
4
DMV-D(LE) 702/622
464 cc/hr
9
11
7
DMV-D(LE) 703/622
464 cc/hr
9
11
7
IMPORTANT
If leakage values are exceeded, replace valve immediately.
7.
Repeat the same procedure for valve V2 (port 3). (Energize terminal 2 on the DIN connector to open
valve 1.)
8.
Verify that the downstream manual ball valve is closed and both automatic safety shutoff valves are de-
energized.
9.
Remove the flexible hose, and close all test nipples.
10. With the upstream manual ball valve open, energize both automatic safety shutoff valves.
11. Use soapy water to check all test nipples to ensure that there are no leaks.
12. If no leakage is detected, de-energize all automatic safety shutoff valves, and open the downstream
manual ball valve.
If applicable: Check the gas pressure switches
Check the low-pressure and high-pressure switches once a year for proper operation.
Low-pressure gas switch
Perform these tasks to check the resistance of the low-pressure switch both in normal operation and in a
fault state.
NOTE
A resistance of more than 1.0 ohm indicates that the switch contacts are starting to either corrode or
carbonize.
1.
Connect a meter capable of r/- 0.1 ohms to the NO and COM contacts.
Service and maintenance
Global Finishing Solutions
33
239-062 rev 5