11. EXPLANATION OF COMPONENTS 11.8.4 PRECAUTIONS FOR USING AIR CONDITIONER When cooling, change the air occasionally. l When smoking and using the cooler, the eyes may begin to hurt. If this happens, use cooling at “OUTSIDE” for a short time to clear out smoke in the cab. l When using the air conditioner for a long period, move the knob to RECIRC. + OUTSIDE once every hour to change the air. Be careful not to overcool the cab. l The cab should feel cool when entering there from outside (5°C or 6°C (9°F or 11°F) lower than the outside tempera- ture). It is not good for the health to have the temperature in the cab too low. Always give careful consideration to temperature regulation.
When using the cooler, make sure the hot water circuit is completely stopped. l If hot water is circulating in the heater, it is like having a hot water bottle in the cab. Always make sure the heater temperature knob is at the OFF position. l When not using the heater for a long period, fully close the hot water outlet and inlet valves at the engine water manifold and the engine oil cooler. 11.8.5 CHECK DURING OFF-SEASON When the air conditioner is not being used, run the com- pressor at low speed for a few minutes every week to avoid loss of oil.
(Run the engine at low speed with the cooler tem- perature control knob at LOW COOL.) REMARK In cold weather, do not run the compressor suddenly at high speed. This may cause failure in the compressor. When the temperature is below 2 to 6.5”C (36 to 44”F), the low pressure cut-off switch functions to stop the compressor from running even when the cooler temperature control switch is turned on. 2-32