Technical data

CIRCUIT BOARD REPLACEMENT (See Fig 15 and 16) .::.:i~:‘;~::,,,,ir~18 I : :‘.): iII
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1.
Remove the pressure control cover and screws.
2.
Turn the pressure control knob all the way counter-
clockwise to the minimum setting to release spring
tension on the circuit board (23). Also check to be
sure only three or four threads of the pressure con-
trol knob shaft are exposed below the pressure ad-
justment nut (S). Back down the nut, if necessary.
See Fig 13.
ICAuT’oN7
Step 2 is essential to reduce the nsk of damaging
the circuit board while removing or installing it.
3.
Disconnect ALL wires from the board, including the
two heavy black wires. Refer to Fig 16. Pay close
attention to where connections are made.
4. To remove the board from the box, pull out the
black plastic-tipped pin (330). Push the bottom of
the circuit board toward the wall of the box and
carefully slide the board out.
5.
Install the board in the box at the same angle as it
was removed. Reconnect the wires as indicated in
Fig 16. Ease the pin 030) into the retainer.
CIRCUIT BOARD 620-356
Fig 15
NOTE: These leads have inter-
changeable connectione:
78 and TPlO
.--- . --__
I ._.... --
--Fin
I
I
L3 ana TPll
23
CAUTION
To reduce the risk of malfunction, be sure the flat
blade of the insulated male connector are
centered exactly in the wrap-around blade of the
female connector when connections are made.
Route all wires carefully to avoid interference with
the circuit board, bourdon tube and pressure con-
trol cover.
6.
I ~IIVI,,, .IIY “.I.. . .“““I.” -....-.-w.-.. -..
27.
TPIO
TP9
paw
THERMAL SWITCH
Fig 16
620-047 26