38
M
AINTENANCE AND
S
ERVICING
Note
Center the rod from front to back of
hole in control case before tightening
screws.
9)
Install the new door switch while sliding it over the
wire rod and secure with the screws and nuts
removed in step 6.
10) Slide the control section back and replace the
screws and lock washers described in step 2.
11) Connect wire marked T1 to terminal T1 and wire
marked T2 to terminal T2 with nuts removed in step
4.
12) Replace the back terminal cover with screws and
lock washers removed in step 3.
13) Test operation of door switch. (See next sect
ion “To
Realign Door
Switches” step 5.)
14) Reconnect to power supply.
To Realign Door Switches
1) Disconnect the furnace from power supply.
2)
Loosen the setscrew on the cam. Open the door
approximately
1” and rotate the cam
counterclockwise until you hear a click then rotate
the cam clock- wise until you hear a click, tighten the
set screw on adjusting cam.
3)
Open and close the door; the switch should click
when the door is opened approximately
2” and 1” to
2” before the door is closed.
4) Reconnect to power supply.
5)
To test the operation of the door switch: turn the
power switch on, set the control to a setting high
enough to keep the control from cycling, open and
close the door; the cycle light should turn OFF when
the door is opened approximately
2” and turn back
ON
1” to 2” before the door is closed.
To Replace the Controller
The controller plugs into a panel mounting sleeve, which
should be left permanently installed in the furnace
housing. To remove the controller, release the side clips
and slide the controller out. Do not attempt to dismantle
this unit further; replace it with a Thermolyne loaner or a
new unit.