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13.4. Heat exchanger replacement
13.4.1.
Effectuate the works listed in pp. 13.3.1-13.3.6
13.4.2.
Screw out two self-threading screws fixing the plank 35 (Scheme 15) and remove it.
Screw out two captive nuts S24 from the heat exchanger's fittings 2 (schemes 15,16, 17).
13.4.3.
13.4.4
Remove the heat exchanger
13.3.4.
Install the new heat exchanger.
13.3.5.
Check the joints subject to disassembling for air-tightness on the operating appliance by means of soap solution bubble test for gas , see p.
7.4.6 and visual examination for water ,see p. 7.3.7
13.5
Battery section replacement
13.5.1 Remove the casing, see p. 13.1 (if necessary).
13.5.2 Disconnect the conductors from the battery section 21.
13.5.3 Unscrew two self-threading screws fixing the battery section 21.
13.5.4 Remove the battery section and install a new one.
13.6
Water and gas unit replacement
13.6.1 Remove the casing, see p. 13.1
13.6.2 Screw off the nut of the pipe of the flame igniter 13 from the valve block 14 of the water and gas unit.
13.6.3 Disconnect the cables from the micro switch 16 and the valve block 14.
13.6.4 Disconnect gas and water supply to the appliance.
13.6.5 Unscrew the nut connecting the burner 9 with the gas unit 15.
13.6.6 Unscrew the screw fixing the electronic control block 4 and remove the block, pushing up the lock on the left side of the block under the
carrier 36 .
13.6.7 Unscrew two screws fixing the carrier 36 (Scheme 15, Scheme 16) to the water and gas unit 3 and remove the carrier 36.
13.6.8 Unscrew four self-threading screws fixing the carrier of the water and gas 3 to the rear wall and remove the water and gas unit.
13.6.9 Install a new water and gas unit.
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