32 GE Zenith Controls ■
ZTSCT / ZBTSCT Operation and Maintenance Manual (71R-5000A)
Maintenance and Testing
A preventive maintenance program will insure high
reliability and long life for the transfer switch. The
preventive maintenance program for the transfer
switch should include the following items:

Inspection and Cleaning

The switch should be inspected for any accumulation
of dust, dirt, or moisture, and should be cleaned by
vacuuming or wiping with a dry cloth or soft brush.
do not use a blower since debris may become lodged
in the electrical and mechanical components and
cause damage.
Remove the transfer switch barriers and check the
condition of the contacts. Any surface deposits must
be removed with a clean cloth (do not use emery
cloth or a file). If the contacts are pitted or worn
excessively, they should be replaced. A general
inspection of mechanical integrity should be made
to include loose, broken or badly worn parts.

Servicing

All worn or inoperative parts must be replaced
using GE Zenith recommended replacement parts.
Please refer to the Replacement Parts manual for
specific part information and ordering procedures.
Please contact the GE Zenith Technical Services
Department for the Replacement Parts manual.
The operating mechanism of the transfer switch
is lubricated with Lubriplate 105. The lubricant
applied at the factory provides adequate lubrication for
the lifetime of the switch. Should debris contaminate
the mechanism, clean and apply additional Lubriplate.
GE Zenith can provide complete preventative main-
tenance services. Please contact the GE Zenith Technical
Services Department for additional information.
CDT battery replacement - lithium batteries may
last up to 10 years, however it is recommended
that battery replacement be included in a 3-5 year
service cycle. The battery maintains the exerceser
memory only and does not otherwise affect the
operation.

Testing

A manual operator handle is provided with the
transfer switch for maintenance purposes only.
Manual operation of the switch must be checked
before it is operated electrically. Both power sources
must be disconnected before manual operation
of the switch. Insert the handle and operate the
transfer switch between the Source 1 and Source 2
positions. The transfer switch should operate smoothly
without binding. Return the switch to Source 1
position, remove the handle, and return it to
the holder provided.
After completing the inspection, cleaning and servicing
of the transfer switch, reinstall the switch cover,
and close and lock the cabinet door. Reclose the
circuit breakers feeding the utility and generator
sources to the switch.
Initiate the electrical transfer test by activating the
TS test switch. P timer will time out and the micro-
controller will send an engine start signal. When
the W time has elapsed, the switch will complete
its transfer by closing into Source 2.
Deactivating the test switch will start retransfer to
Source 1. The switch will complete its retransfer
to Source 1 after the time delay of the T timer.
The U engine overrun timer allows the engine
generator to run unloaded for a preset cool
down period.
NOTE: A periodic test of the transfer switch
under load conditions is recommended
to insure proper operation. (See National
Electric Code articles 700 and 701).
CAUTION
Due to hazardous voltage and current, GE Zenith
recommends that a GE Zenith Certified technician
or a qualified electrician must perform the
installation and maintenance of the switch.
WARNING
Both power sources must be disconnected
before manual operation of the switch.
WARNING
When performing a hi-pot or dielectric test
on the power section, DISCONNECT the
control panel plugs from the microprocessor
to avoid potential damage.