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NOTE: Waxed fuel can obstruct the fuel line 3.11.2 COMPONENT DESCRIPTION AND 3.11.2.1 DCHA ASSEMBLY The DCHA is a supplemental heater designed to pre-heat the engine’s coolant in order to supply the The DCHA assembly consists of a: • combustion air fan assembly • burner housing • burner insert • control unit/heat exchanger • combustion chamber • dosing pump 3.11.2.2 COMBUSTION AIR FAN The combustion air fan assembly includes the: • combustion air fan • combustion air fan inlet • fuel supply inlet The combustion air fan delivers the air required for combustion from the combustion air inlet to the 3.11.2.3 BURNER HOUSING The burner housing includes the: • coolant inlet • coolant outlet • exhaust outlet The burner housing accommodates the burner insert and is combined with the control unit/heat 3.11.2.4 BURNER INSERT The burner insert includes the: • combustion pipe fuel cross section • glow plug/flame sensor Inside the burner insert, fuel is distributed across the combustion-pipe fuel cross section. Combustion bustion pipe to heat the exchanger. The glow plug/ 3.11.2.5 CONTROL UNIT/HEAT The control unit/heat exchanger includes the: • control unit • temperature sensor • overheat protection • heat exchanger • connector terminal The control unit controls and monitors combus- tion operation. The control unit is ventilated by The temperature sensor senses the coolant tem- perature in the heat exchanger as an electrical The overheat protection, controlled by the tem- perature resistor, protects the heater against undue 3.11.2.6 DOSING PUMP The dosing pump is a combined delivery, dosing, and shut-off system for the fuel supply of the heater. 3.11.3 OPERATION 3.11.3.1 VENTING THE DCHA’S EXHAUST WARNING: DO NOT OPERATE THE DCHA IN DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS VENT 25 GENERAL INFORMATION |