Table of Contents
Advertisement
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 four self-threading screws fixing the carriers 33 and 34 (scheme 17) and remove them.
Screw out two captive nuts S24 from the heat exchanger's fittings 2 (schemes 15,16, 17).
13.4.3.
13.4.4. Loosen two pinching nuts fixing the heat exchanger 2 to the carriers of the rear wall.
13.4.5
Remove the heat exchanger
13.4.6.
Install the new heat exchanger.
13.4.7.
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 four self-threading screws fixing the carrier of the water and gas 3 to the rear wall and remove the water and gas unit.
13.6.7 Install a new water and gas unit.
13.6.8
After installing and connecting the water and gas unit check gas and water connections for air-tightness, see p. 7.4.6 and p. 7.3.7. Gas and water
leakages are unacceptable.
Check the appliance's operation with a new water and gas unit.
13.6.9
Replacement of the water and gas unit's valve block
13.7
13.7.1
Remove the casing, see p.13.1.
13.7.2
Disconnect the cables from the valve block 14 of the water and gas unit 3.
Advertisement
Table of Contents
