5
MAINTENANCE GUIDE
MAINTENANCE GUIDE: CLAS HE
3.17 MAIN HEAT EXCHANGER
MAIN HEAT EXCHANGER
Tools
Time
20 min
1
Drain boiler (see 3.3). Remove
the four clips and disconnect the
two
pipes
between
the
exchanger
and
pump
and
between the exchanger and left
hand hydraulic block
Isolate the gas supply. Remove
the four screws and disconnect
the gas pipe from the gas valve
Remove the four screws to free
the heat exchanger
2
Pull the heat exchanger towards
you
Remove the clip and lift the
manual air vent
Twist the thermal fuse to
remove
Page. 17 of 24
MAINTENANCE GUIDE: CLAS HE
3.15 TEMPERATURE SENSORS & OVERHEAT THERMOSTAT
TEMPERATURE SENSORS & OVERHEAT THERMOSTAT
Tools
Time
5 min
1
OT
: White wires
Remove the clip and the
temperature sensor or
overheat thermostat together
NTC1
: Black wires
NTC2
: Grey wires
Unplug the electrical
connectors
IMPORTANT!!!!
Do not use conducting paste for the contact sensors because it will alter the resistance value.
TEMPERATURE (°C)
RESISTANCE (kOmh)
0
27
10
17
20
12
25
10
30
8
40
5
50
4
60
3
70
2
80
1,5
3.16 MANUAL AIR VENT
MANUAL AIR VENT
Tools
5 min
Time
1
Drain boiler (see 3.3)
Remove the clip and lift the manual air vent from the exchanger
Page. 16 of 24
Summary of Contents for 47-116-51
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