DeLUX DPX12T, Installation & Operation Manual

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Gas Electro-mechanical Valves
w w w . m a x o n c o r p . c o m
combustion systems for industry
Maxon reserves the right to alter specifications and data without prior notice.
© 2009 Copyright Maxon Corporation. All rights reserved.
10 - 30.1 - 33
E - m - 10/09
Field installation of valve position switch
General
„
Shut off fuel supply upstream of valve, then de-energize valve electrically.
„
Remove terminal block and access cover to provide access, being careful not to damage gaskets.
„
Compare with illustrations below to identify your valve type.
Replacement switches
„
Note wand position and mounting hole location carefully, then remove 2 screws and lift existing switch.
„
Install replacement switch in same mounting holes on bracket and verify correct wand position.
„
Replace existing wiring one connection at a time, following original route and placement.
Add switches
NOTE: Instructions below are written for normally-closed valves. For normally-open valves, reverse switch nomenclature (VOS
becomes VCS and vice versa).
„
Check illustrations below. If your valve uses a switch mounting bracket as in Fig. 1 & 2, mount switches to bracket using the
mounting holes appropriate for valve type and size. For high capacity valves, mount switches on the support stand.
„
Position bracket so VCS wand just touches top of actuator, then move downward slightly, depressing wand until switch clicks,
then tighten mounting screws to hold this position.
„
Pin bracket by drilling 3 mm diameter holes 6 mm deep into bracket mounting pad through drive pin holes, then tap drive pin in
until flush (not required for high capacity valves).
„
Route wires to wiring compartment as shown, then complete wiring connections and clean out metal drilling chips from previ-
ous procedure.
„
Cycle valve, checking switch actuation points carefully. (VCS actuates at top of stem stroke, VOS at bottom.) Simultaneously
the valve body must be tested for switch continuity and seat leakage. Bend VOS switch wands slightly if necessary to insure
valve is opening fully.
„
Replace covers, then return valve to service.
Fig. 1
Manual reset actuator
3/4” - 3” standard flow
Fig. 2
Automatic reset actuator
2-1/2” CP - 4” CP and 6” standard flow
Fig. 3
Automatic reset actuator
4” & 6” high capacity
Reference mounting bracket A Reference mounting bracket B Switches mount on support stand
NC COM
#1 BLACK TO
#3 BLACK TO
BLACK TO MOTOR
TERMINAL #1
TERMINAL #3
NO
1
2
12 11 10 9 8 7 6 5 4 3 2 1
TO CLUTCH