S-SERIES AIR CONDITIONING -- HEATER SYSTEM

Figure 18. - Control Cable Adjustment - Heater Only Models

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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S-SERIES AIR CONDITIONING -- HEATER SYSTEM When the VENT knob is turned counterclockwise, air enters the cab from the hoodscoop and flows through the instrument panel outlets and floor dump. Except for the ventilation mode, the knob should be rotated to its full clockwise position (vent door closed) for all other modes of operation. To Increase the quantity of air entering the cab in the ventilation mode, the fan may be used to power ventilate. The fan speed and air outlets can be adjusted for the desired air flow. HEATING For proper cold weather operation, the heat should be directed toward the floor. Therefore, close all instrument panel outlets and fully open the floor dump outlet. Heating is controlled with the HTR (heat) lever. The full right HOT position provides the maximum heat. Move the AIR OUTLETS control lever either to the full cab position or to any of the other three detented positions in order to obtain the desired air flow distribution between cab heat and defrost requirements. For the maximum air flow, set the fan switch on the H I position. The heater will also operate with the fan motor in the OFF position. Air flow is provided by ram air when the truck is being driven. DEFROSTING To obtain maximum defrosting, move the HTR lever to the HOT position and place the AIR OUTLETS lever on DEF. Adjust the fan speed to provide the desired air flow. To clear the system of humid air, operate blowers for 30 seconds at HI speed before moving the AIR OUTLETS lever to the DEF position. This will minimize rapid fogging of glass, which can occur if humid air is blown onto a cold windshield. To improve defroster efficiency, remove ice and/or snow from glass area. ADJUSTMENTS HEATER ONLY Control Cable Adjustment The heater cables on the Heater Only system are self- adjusting (Figure 18). After the cables have been installed, move the control levers through two complete cycles as follows: Defroster Cable Move Defrost lever from Defrost mode to Cab mode and back to Defrost mode. Heater Cable Move Heat lever from Heat Off mode to Heat On mode and back to Heat Off mode. Repeat each step twice, checking for complete sealing of the doors in each position. CTS-4066A Page 11

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