A11
Donaldson Company, Inc.
Solid-State Timer Installation
The solid-state timer is an electronic timer used to control the filter cleaning system. Each power module is equipped with four or
six 115-Volt AC solenoid valves that energize the diaphragm valves to pulse-clean the filter cartridges. The timer is factory adjusted
at 100-millisecond ON time and 10-second OFF time between pulses.
1. Mount the fan starter with low voltage control in a convenient location.
2. Mount the control box as close to the blower motor starter as possible.
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.
Note: Access the solenoid valves and blower motor by removing the access covers at the rear of the power module. After
wiring is complete, replace the covers.
Route wiring through the conduit holes located at the rear of the power module. All conduit holes are sized for 3/4-in
fittings. Secure all conduit in the blower and solenoid plenums.
4. Diaphragm valves have an external solenoid enclosure mounted inside the clean air plenum on the pressure manifold.Wire
each solenoid in the enclosure mounted on the compressed air manifold per the wiring diagram provided. Pull the cover from
the solenoid enclosure. Wire solenoids through access points in rear of cabinet and enclosure by referencing wiring diagram.
5. Motor and fan should be wired for clockwise rotation when viewed from the back of the motor.
To reverse rotation, three-phase power supply:
Turn electrical power OFF at source and switch any two leads on the motor junction box.
Do not look into fan outlet to determine rotation. View the fan rotation through the back of the motor.
Check that the exhaust plenum is free of tools or debris before checking blower/fan rotation.
Stand clear of exhaust to avoid personal injury.
Do not interchange a power lead with the ground wire. Severe damage or personal injury may result.
6. Turn the blower motor ON then OFF. Check for clockwise rotation when viewed from the back of the motor.
7. Turn blower fan motor ON.
Solenoid Enclosure
