To Replace Door Switches (Micro-Switch) - Barnstead 47900 Operation Manual

M S
AINTENANCE AND
46
ERVICING
8. Replace both back covers.
9. Reconnect to the power supply.
10. Test the operation of the furnace.
To Replace Door Switches
(Micro-Switch)
1. Disconnect the furnace from the
power supply.
2. Remove the screws on the front dial
and the screws and lock washers on
the back cover.
3. Slide the control section forward.
(Note: do not pull excessively on the
internal wires.)
4. Disconnect the wires from the door
switch. (Note the connection place-
ment of the wires to the micro-
switch.)
5. Remove the screws and nuts from
the micro-switch.
6. Insert new micro-switches and
secure with the screws and nuts
removed in step 5.
7. Reconnect the wires to the new door
switch.
8. To realign the door switches, see the
following section, "To Realign Door
Switches."
9. Slide the control section back and
replace the screws and lock washers