Donaldson Company, Inc.
12
Electrical Connection
Caution!
Electrical installation must be
performed by a qualified
electrician and comply with all
applicable national and local codes.
Lock out electrical power sources
before performing service or
maintenance work.
Do not install in classified
hazardous atmospheres without an
enclosure rated for the application.
Caution!
Do not
look into fan outlet to
determine rotation.
Check that the exhaust plenum is
free of tools or debris before
checking blower/fan rotation.
Stand clear of exhaust to avoid
personal injury.
Note:
The solid-state timer requires a 105 to 135-
Volt, customer-supplied power supply.
1. Mount a customer-supplied motor starter with
a low-voltage control circuit in a convenient
location.
2. Mount the solid-state timer as close to the
blower as possible.
Note:
Do not mount the solid-state timer on the
unit. Mechanical vibration can damage
the control.
3. Using the wiring diagram supplied, wire the
blower motor, blower-motor starter, solid-state
timer, and solenoid valves. Use appropriate
wire gauge for rated amp load as specified by
local codes.
4. Turn the blower motor ON then OFF to check
for proper rotation by referencing the rotation
arrow located on the motor
s mounting plate.
To reverse rotation, three-phase power supply:
Turn electrical power OFF at source and switch
any two leads on the output-side of the fan-
motor starter.
5. With power supply ON, check the operation of
the solenoid valves. The valves should open and
close sequentially at factory set 10-second
intervals.
6. If a Photohelic gauge or similar device is used
to control the solid-state timer and the jumper
on the pressure switch portion of the timer is
removed, the solenoid valves pulse only when
the differential pressure reaches the high-
pressure setpoint. The valves continue to pulse
until the low-pressure setpoint is reached.
