WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 16
4. Valve Position Indication Faults (Part Numbers C422425 and C422695 Only)
A. Disconnect the wires connected to terminals 3 and 4.
B. Using an ohmmeter, check for continuity between terminals 3 and 4. There must be an open
circuit path when the valve is de-energized.
C. If the position indication circuit path is complete (continuity), the position indicating switch has
failed. Return the faulty valve to Whittaker Controls for failure analysis, overhaul and proper
testing to certification.
5. Operation
A. If no faults are found in the preceding paragraphs, reconnect the field power input wiring to
terminals 1 and 2.
B. Apply 24 VDC electrical power between terminals 1 and 2. The valve should actuate open or
closed, depending on whether it as a normally open or normally closed valve (refer to Table 1
or Figure 2). If possible, verify that the valve position and flow status are correct.
C. If operation is not normal, return the faulty valve to Whittaker Controls for failure analysis, over-
haul and proper testing to certification. If operation is correct, proceed with the following steps.
D. Using an ohmmeter, check for continuity between terminals 3 and 4. There must be continuity
when the valve is energized.
E. If the position indication circuit path is open (no continuity), the position indicating switch has
failed. Return the faulty valve to Whittaker Controls for failure analysis, overhaul and proper
testing to certification.
F. Turn off and lock out the electrical power.
G. If no faults are found, the valve is operating correctly and may be returned to service.
H. If the valve is to be returned to service, re-install the terminal cover and secure it with the
screws and washers. Tighten the screws securely.
6. Equipment Returns
Prior to returning any equipment item to Whittaker Controls, please contact their Contracts Depart-
ment at 818-765-8160 for return shipment information and authorization.
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