9
MERCURY SWITCH TO MICROSWITCH RETROFIT KIT KA349WE INSTALLATION INSTRUCTIONS
MN280022EN October 2015
Install microswitches SW1, SW3
1. Attach the new SW1 and SW3 microswitch assembly
(Item 2) to frame using screws (Item 11), larger, round
spacers (Item 10), external tooth lockwashers (Item 13),
and stop nuts (Item 12), (Figure 24). Do not tighten at
this time.
Figure 23. Attach SW1/SW3 microswitches to frame.
2. Gently push switch assembly down until hearing a click
as switch SW3 contact meets cam and closes. Secure
switch in position at which click is heard (Figure 22).
Attach cable leads
Attach leads from cables switch SW1 and SW3 as described
in the steps outlined below. On both switches, connect one
lead to the end terminal marked common and one lead to
the middle terminal marked open (Figure 24).
1. Attach leads of the short microswitch cable originally
removed from old switch SW1 to new switch SW3.
2. Attach leads of shorter cable in kit (Item 9) to new
switch SW1.
3. Route SW1 and SW3 cables to terminal block (Figure
25).
4. Secure cables with plastic cable tie (not supplied) and
plastic cable retainer (Item 1) from kit. Use existing
hardware to attach new cable retainer in the same
position used by the old one.
5. At the terminal block, make the following connections
(refer to Figures 5 and 27 for terminal identification):
A. Switch SW1, connect leads to terminals C and D.
B. Switch SW2, connect leads to terminals F and N.
C. Switch SW3, connect leads to terminals A and N.
Figure 25. Terminal block connections.
6. Verify the following connections to terminal block are in
place:
A. Rotary solenoid leads connected to terminals E and
F.
B. Trip solenoid leads connected to terminals A and B.
Complete installation
1. Reconnect the large spring in lower portion of
mechanism (Figure 20).
2. Remove blocking mechanism (Figure 19).
3. Reconnect contact bar. Make sure to reinstall all
washers or spacers that may have been removed when
disconnecting it (Figure 23).
4. Check work and ensure all fasteners are tight. Inspect
mechanism for loose parts; if found, remove them.
5. Test switches as outlined in the Testing section.
6. Follow procedures in appropriate maintenance manual
to tank recloser and return it to service.
COMMON
CLOSED
CLOSED
OPEN
COMMON
OPEN
Slotted hole of
bracket
Switch SW3
Machine screw
Spacer
Frame
External tooth
lockwasher
Switch SW1
Stop Nut
Torque to
18-20 in-lbs
Cable
Switch SW2 Switch SW1
Switch SW3
Rotary
Solenoid
Trip
Solenoid
A
B
C
D
E
F
N
Figure 24. Microswitches SW1 and SW3 in place.
