Instructions For Switch, Terminal Strip
and Mounting Bar Replacement
For Linear, Rotary Valve or
Actuator Constructions
IMPORTANT: See separate instructions for Setting
Mechanically Operated or Non Contact Switches.
MAINTENANCE
WARNING: To prevent the possibility of
personal injury or property damage, turn off
electrical
power,
before
inspecting,
rebuilding or removing valve position
indicator. Also turn off electrical power and
pressure to related systems.
DISASSEMBLY AND REASSEMBLY
Replacement of SPDT Mechanical Switches,
Non Contact Switches or Terminal Strip with
Mounting Bar
1. Disassemble switches in an orderly fashion paying
careful attention to exploded views. Refer to Figure 1
for mechanical switches; Figure 2 for non contact
switches.
Note: For Series M position indicators (not shown on this
form), when disassembling disconnect switch wiring from
terminal strip first. When reassembling, install switch first.
2. Remove two switch mounting screws, switch and
mounting columns from Switch 1 and Switch 2, (if
present). Note columns are two different diameters.
3. Cut wire tie that secures switch wires to post in position
indicator housing (not present on Series M).
4. For ease of access and wiring, loosen terminal strip by
removing terminal strip mounting screws from center
of strip.
5. Disconnect switch wires from terminal strip.
6. If a new terminal strip with mounting bar is installed
disconnect supply wires and solenoid wires from
terminal strip.
7. Remove mounting bar mounting screws using a 1/16I
hex key wrench.
8. Reassemble mounting bar, terminal strip, switch
mounting columns and switch(s) following exploded
views and wiring diagram provided in position
indicator housing cover.
NOTE: Make electrical switch connections to terminal strip
before installation of switches or terminal strip in indicator
housing.
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ASCO Valves
MCMXCVII All Rights Reserved.
SERIES
C, L, M & S
Form No.V6976
9. Install new wire tie when reassembling (not supplied in
rebuild kit).
10. Refer to Torque Chart on page 2 of 4.
11. Test operate switches before returning the position
indicator to service.
12. After it has been determined that the switches and
indicator are operating correctly, return power supply
to valve position indicator.
Replacement of DPDT Switches or Terminal Strip
with Mounting Bar
1. Disassemble switches in an orderly fashion paying
careful attention to exploded view. Refer to Figure 3.
2. Remove two switch mounting screws (with
flatwashers), upper insulator, switch and lower
insulator. For dual switch constructions (as shown in
Figure 3), remove spacers, upper insulator, switch and
lower insulator.
3. Cut wire tie that secures switch wires to post in position
indicator housing.
4. For ease of access and wiring, loosen terminal strip by
removing terminal strip mounting screws from center
of strip.
5. Disconnect switch wires from terminal strip.
6. If a new terminal strip with mounting bar is installed
disconnect supply wires and solenoid wires from
terminal strip.
7. Remove mounting bar mounting screws using a 1/16I
hex key wrench.
8. Reassemble mounting bar, terminal strip, insulator
spacers and switch following exploded views and wiring
diagram provided in position indicator housing cover.
NOTE: Make electrical switch connections to terminal strip
before installation of switches or terminal strip in indicator
housing.
9. Install new wire tie when reassembling (not supplied in
rebuild kit).
10. Refer to Torque Chart on page 2 of 4.
11. Test operate switches before returning the valve
position indicator to service.
12. After it has been determined that the switches and
indicator are operating correctly, return power supply
to valve position indicator.
Printed in U.S.A.
Page 1 of 4
50-60 Hanover Road, Florham Park, New Jersey 07932
Torque Chart
Part Name
All mounting screws
Housing cover screws (not shown)
Torque Value Inch - Pounds
20 maximum
30 ± 3
Torque Value Newton-Meters
2,3 maximum
3,4 ± 0,3
IMPORTANT
Wiring diagram provided
in housing cover
terminal strip
mounting bar
long mounting screw (2)
short mounting screw (2)
mechanical
switch
1
2
terminal strip
mounting screw
(see note 2)
3
4
5
6
7
mounting
column
(see note 1)
terminal strip
8
mounting bar screw
(see note 2)
(1/16I hex key wrench)
wire tie
(used to retain
wire leads from
switch 2)
(see note 3)
Notes:
1. Columns are different diameters.
2. The number of screws will vary depending upon
terminal strip size.
3. Install new wire tie at reassembly
(not supplied in kit).
IMPORTANT
See
Torque Chart
Figure 1. Replacement of mechanical switch, terminal strip and mounting bar.
Page 2 of 4
ASCO Valves
Form No. V6976
50-60 Hanover Road, Florham Park, New Jersey 07932
IMPORTANT
Wiring diagram provided
in housing cover
long mounting screw (2)
terminal strip
mounting bar
1
2
non-contact
switch
(see note 3)
short mounting screw (2)
terminal strip
mounting screw
(see note 2)
3
4
5
6
7
mounting
column
(see note 1)
terminal strip
8
mounting bar screw
(see note 2)
(1/16I hex key wrench)
wire tie
(used to retain
wire leads from
switch 2)
(see note 4)
Notes:
1. Columns are different diameters.
2. The number of screws will vary depending upon
terminal strip size.
3. Switch wires should be loosely twisted to contain wires
in a bundle and avoid engagment with gears.
4. Install new wire tie at reassembly
(not supplied in kit).
IMPORTANT
See
Torque Chart
Figure 2. Replacement of non contact switch, terminal strip and mounting bar.
Form No.V6976
ASCO Valves
Page 3 of 4
50-60 Hanover Road, Florham Park, New Jersey 07932
Figure 3. Replacement of DPDT switches, terminal strips and mounting bar.
Page 4 of 4
ASCO Valves
Form No. V6976
50-60 Hanover Road, Florham Park, New Jersey 07932