Technical information
Technical Manual - Page 32
THEORY OF OPERATION
When keypad up/down button is pushed, contacts on the main PCB close between #12 and #13. Closing these
contacts activates the triac for the sleeve motor which is connected to terminals L3 and N3 on the main PCB.
The motor then raises the intake assembly until contact is made with the up stroke limit switch opening the
circuit and reversing the electronic switch on the main PCB. When pressed again, the cycle reverses itself and
stops in the retracted position.
VENT PCB DIAGNOSIS (ALL MODELS)
Warning – With the motor disconnected, and the vent in the down position, 120VAC will be present between
terminals L2 and N2 on the main PCB. When testing for a load, the motor must be connected to these terminals.
CIRCUIT BOARD DIAGNOSTICS
To test the main control board,(located in the right front corner of the vent) remove the access panel and unplug
the touch pad from the main control board. When the touch pad harness is pulled off it will reveal 14 pins
coming from the main control board. Use the button contact chart and circuit board wiring order chart. Use a
jumper wire to jump across the 14 pins for each function.
KEYPAD DIAGNOSIS
(All Models)
Of all the returned keypads the most common problem is poor electrical contact between the Touch Pad and the
Contact Board. In the majority of these cases the Keypad Assembly is replaced unnecessarily. Before replacing
the Keypad Assembly check for a foreign material between the Touch Pad and the Contact Board. Examples
of foreign material include grease, cooking residue, moisture, or residue from cleaning agents. Circuit board
cleaner or equivalent (available from electronic supply stores) should be used to clean the keypad assembly.
To diagnose the keypad:
1. Disconnect the Keypad Molex plug at the Main PCB and attach leads of an ohm meter to pins
#12 and #13.
2. Push the UP/DOWN button. This must show a closed circuit.
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