2
MANUAL OPERATION
A means for manual operation is provided for mainte-
nance purposes only. The switch must be completely
de–energized. Open the supply source circuit breaker to
the ASCO 920. Label, tape, and disconnect the control
circuit wires from terminals
L
,
0
, and C.
Do manually operate the RC Switch until all
power sources (service & control) and all loads
are deenergized (open circuit breakers).
A slotted socket in the cover directly connects to the
solenoid operator mechanism. Use a medium blade
screwdriver to turn the socket 1/4 turn clockwise to
close or counterclockwise to open. See Figure 2 below.
insert screwdriver
turn clockwise to
close or counter-
clockwise to open
With all power OFF
Figure 2. Socket in nameplate for manual operation
ALL POWER MUST BE OFF BEFORE TURNING !
TROUBLESHOOTING
Note any Optional Accessories that may have been
furnished with the ASCO 920 and review their operation.
Deenergize all power sources to the Remote
Control Switch before working on it.
RC Switch opens and closes repeatedly
.
1.
Check Wiring.
Make sure control stations are not
calling on the ASCO 920 to open and to close at
the same time. See Wiring Diagram.
2.
Check Control Station.
Make sure control
stations do not have overlapping contacts.
RC Switch tries to open or close, but cannot
.
1.
Check Voltage.
Make sure control line voltage is
at least 90% of nameplate coil voltage.
2.
Check Line Run & Wire Size.
Make sure control
line size and distance is within the requirements of
Table A, page 1.
3.
Check VA Burden of Transformer.
If a transform-
er is used in the control line, make sure it can handle
the VA burden required. See Table B, page 1.
REPLACEMENT PARTS KITS
For convenience, replacement contacts and coils are
sold in kit form. Select kits by noting switch ampere
size, number of poles, and coil control voltage as
specified on the nameplate. The kits can be ordered
from any ASI, 1–800–800–ASCO. (2726).
For other parts, and service procedures, refer to Service
Bulletin 381339–015. This publication is supplied with the
kits. When converting to a control voltage different from
originally furnished, request a new nameplate.
Coil Kits
for these AC Control Voltages
110–120 V
208–240 V
265–277 V
440–480 V
605326–001
605326–008
605326–002
605326–003
ASCO 920
Contact Kits
Coil Control Contact Kit
Lubrication Kit
3
ASCO 920
amp. size
2 Pole
3 Pole
Coil Control Contact Kit
Lubrication Kit
3
30–100
331709
331703
331713
625549
150–225
331710
331704
331713
625549
3
Lubrication points: core and link inside the core tube, operator spring, and rotating weight pin.
