5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 161
© 2009 DH Instruments, a Fluke Company
5.11.2.1
HIGH PRESSURE VENT VALVE LEAK
To identify the high pressure vent valve in the PPCH schematic, see Section
3.2.1, Figure 9.
To localize a leak to the high pressure vent valve, proceed as follows:
If the PPCH
TEST
port is not already plugged, plug it with a DH500 gland and
plug.
If the PPCH has a Lo Q-RPT, use
[RANGE]
to make the Hi Q-RPT or utility
sensor active (see Section 3.3.1).
Vent the PPCH and disconnect electrical power and drive air supply.
Open the PPCH chassis to gain access to the mechanical module (see
Section 5.9).
Loosen the high pressure vent valve bracket retaining hardware (two button
head bolts).
Step 5
