Servicing The Wrap-Around Strap Type Heater

Servicing Thermostatically Controlled Cartridge Type Heater

Fig. 28 Exploded View of CR Brakemaster Heat Exchanger

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL the thermostat on the bottom cap. Discard entire heater/thermostat assembly. 5. Install new heater by inserting it into hole from which old heater was removed and retighten set screw. 6. Install new thermostat by inserting it into the hole from which old thermostat was removed and attach by means of the two screws provided. 7. Attach the lead from the thermostat to the electrical system. Even though the heater is thermostatically controlled, it is recommended that the heater be hooked up through a control switch. 8. Be sure the unit is grounded to the chassis. Servicing The Wrap-Around Strap Type Heater This heater is designed for use with the older style (prior to January 1, 1979) bottom caps which do not contain a standard cartridge type heater. The following are the instructions for installing or replacing this strap type heater. 1. Clean the semi-circular boss farthest from the unloader nut. 2. Position heater on boss with mounting flange against fin on bottom cap. 3. Mark hole location on fin. 4. Drill a 3/32 diameter hole at hole location. 5. Reinstall heater and install by means of the screw 6-32 supplied. 6. Connect heater lead wire to electrical system of vehicle. The wrap-around strap type heater is not thermostatically controlled, therefore it will be necessary to either be connected to the vehicle’s heater switch or to a toggle switch at the instrument panel to be controlled by the operator. CTS-4079 - CHAPTER XIV - Page 19

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