47
Donaldson Company, Inc.
Electrical installation, service
or maintenance work during
installation must be performed
by a qualified electrician and comply with all
applicable national and local codes.
Turn power off and lock out electrical power
sources before performing installation, service, or
maintenance work.
Do not install in classified hazardous
atmospheres without an enclosure rated for the
application.
Solid-State Timer Installation
The solid-state timer is used to control the filter cleaning
system.
1. Choose a location convenient for accessibility and
maintenance.
2. Using the wiring diagram supplied, wire the blower motor,
blower-motor starter, solid-state timer, and solenoid
valve. Use appropriate wire gauge for rated amp load as
specified by the local codes.
Solenoid Connection
The collector is equipped with a solenoid valve (typically 120V)
that controls the pulse-cleaning valve, which cleans the filters.
Wire the solenoids to the solid-state timer following the wiring
diagram supplied with the collector. Filter life and cleaning
operation will be affected if not wired correctly.
The solid-state timer requires
a 105 to 135-Volt, customer-
supplied power supply.
Do not mount the solid-state timer directly to the
collector or the positive displacement blower as
mechanical vibration can damage the timer.
Timer and Solenoid Specifications
Power to the solid-state timer is supplied to Terminals L1 and
L2, which are intended to operate in parallel with the positive
displacement blower starter’s low-voltage coil. On fan start-
up, power is supplied to the timer and the preset OFF time is
initiated. At the end of the OFF time, the timer energizes the
solenoid valve to provide the ON time cleaning pulse for the
diaphragm valve and repeats this cycle until the system is shut
down. The timer can also be wired for on demand cleaning
with an external pressure switch. If this option is selected, the
high and low limit pressure switch relays will be connected to
the TB2 corresponding terminals. Otherwise, the common and
high limit terminals on TB2 are jumpered to provide continuous
operation.
Note: If the collector was supplied with an electrical
control panel, the wiring diagram supplied with
the control panel takes precedence over the
general diagrams shown in this manual.
