Bobrick AirCraft B-701, Troubleshooting And Information Manual, Page: 21 / 66

Page 15
Warning
Risk of electric
shock
Disconnect power
supply before
removing cover
Installation Of Base Plate Mounted Triac
Note: This procedure applies only to surface-mounted or recessed
dryers with triac mounted on the base plate. For touch button models
with triac mounted on the timer bracket, the complete timer assembly
must be replaced.
To Remove Existing Triac
1. Disconnect power supply and remove cover.
2. Remove white, yellow or pink, and black Push On connectors from triac.
3. Remove the two screws securing the triac to the base plate.
4. Remove the triac and place to one side for return to Service Department.
To Install New Triac
Note: On factory-installed triac, a white Heat sink Compound is interposed between the triac flange and the
dryer base plate to ensure rapid conductivity of heat away from the triac. For service purposes this compound
is replaced by a thin plastic gasket of heat conducting material, this must be sandwiched between the flange
and the base plate during assembly.
1. Position new triac and pad on base plate with the Terminals positioned as shown in illustration below.
Insert and tighten the two self-threading screws and shake proof washers provided.
2. Attach the white wire Push On
connector to the small spade
Terminal on the triac. The black
wire from the Terminal Block
should then be attached to the
next Terminal round in a
clockwise direction and the
yellow or pink wire to the
remaining Terminal.
3. Replace dryer cover. Switch on
electrical supply and test
operation, allow 10 seconds for
the controller to stabilize before
placing hands in front of lens
(automatic units).