Repair
Repair
WARNING
Read warnings, pages
Hazardous Location Heaters: See FIG. 15 & 17
Primary Thermostat & Probe
1.Follow Pressure Relief Procedure, page 14.
2.Remove housing cover (18).
3.Hazardous Location Heater only: Loosen nut (27).
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).
9.Remove bracket from thermostat (24) and secure to new thermostat.
CAUTION
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 capillary tube to contact the block terminal (3A). Follow step 10, below.
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
11.Continue reassembling in reverse order of disas- sembly. See Reassembly Notes, below.
Backup Thermostat
1.Follow Pressure Relief Procedure, page 14.
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 FIG. 15 or 16 for wiring connections.
•
•Secure cover (18) with lockwashers (5) and screws (6 or 52); torque screws to 89
18 | 309524N |
