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| Dismantling and assembling heater unit → Chapter |
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| Pull combustion chamber -5- out of heat exchanger -2-. |
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| Use suitable screwdriver carefully to press heat exchanger -2- through rear water connection (water inlet) -arrow A- out of water jacket -1- in direction of -arrow B-. |
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| Before assembling, always replace O-ring -3- and seal -4-, and observe installation position of heat exchanger → Fig. |
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