Repair
309524V
19
Repair
Hazardous Location Heaters:
See F
Non-hazardous Location Heaters:
See F
Primary Thermostat & Probe
1.
Follow
2.
Remove housing cover (18).
3.
Hazardous Location Heater only:
Loosen nut (27a).
Non-hazardous Location Heater only:
Loosen
screws (25).
4.
Loosen setscrew (26) in switch shaft (28).
5.
Remove screw (16) and bracket (19) holding probe
(EE).
6.
Remove wires from the primary thermostat termi-
nals (FF).
7.
Pull thermostat probe (EE) out of heater block (3).
Remove thermostat (24) from housing (1).
8.
Hazardous Location Heater only:
Remove screws
(25).
Non-hazardous Location Heater only:
Remove
screw standoff (35) with washer (27b).
9.
Remove bracket from thermostat (24) and secure to
new thermostat.
10. Liberally apply thermal lubricant (part no. 110009) to
probe (EE) of new thermostat (24). Loop capillary
tube (GG) several times and wrap the loops with tie
strap (42-not shown). Insert probe in the heater
block (3).
11. Continue reassembling in reverse order of disas-
sembly. See
, below.
Backup Thermostat
1.
Follow
2.
Remove housing cover (18).
3.
Remove screws (HH) on backup thermostat (10)
tabs, and remove the wires
–
one from heater block
(3a) and one from line in (9b).
4.
Remove the two screws (16), then remove the ther-
mostat (10).
5.
Liberally apply thermal lubricant (part no. 110009) to
the bottom of the thermostat (10) and reinstall it in
reverse order of disassembly.
Reassembly Notes
•
Refer to F
. 15 or 16 for wiring connections.
•
Non-hazardous Location Heater only:
Make sure
gasket (47) is installed and aligned with electrical
housing screw holes.
•
Secure cover (18) with lockwashers (5) and screws
(6 or 52); torque screws to 89 in-lb (10 N•m).
To avoid burns, electric shock, and skin injection,
make sure the main power is OFF, heater is cool, and
pressure is relieved before repairing.
NOTICE
To avoid damaging capillary tube (GG), which can
cause heater malfunction, do not kink or nick the
tube.
To avoid shorting out the heater, do not allow capil-
lary tube to contact the block terminal (3a). Follow
step 10, below.