TSS Calydra Comfort 100 Nat, Installation And Operating Instructions Manual

6

Before removing appliance case, isolate
the gas and electrical supplies. Isolate boil-
er from the system and drain before
removing any component in the water-
ways. Ensure that the appliance is cool.

1. Outer Case
Remove four screws in base of case and

lift free. When replacing, carefully locate on
lugs 

B on top edge of chassis.

2. Combustion Chamber
Unscrew four self tapping screws securing
the sealed chamber front panel and lift
over top corner locating lugs. Unscrew four
self tapping screws to release combustion
chamber front plate and lift clear.
Reassemble in reverse order.

3. Burner Manifold
Carry out steps 

1 and 2 as above. Remove

two screws securing the closure plate and
the remaining four screws to release the
manifold. Lift clear. Replace the manifold
gasket. Reassemble in reverse order.

4. Ionisation Electrode
Carry out steps 

1 and 2 as above. Loosen

screws securing the closure plate and
remove. Disconnect the lead from the main
wiring loom. Remove screw securing elec-
trode to burner. Thread wire through grom-
met and lift clear. Reassemble in reverse
order.

1

2

3

0

4

bar

A

A

Remove outer case and sealed chamber
front panel as in steps 

1 and 2.

Disconnect three pressure switch cables
noting their positions.
1 = white cable  connected to NC
2 = black cable connected to NO
P = orange cable connected to C
Remove screw securing the switch
bracket to the chassis. Disconnect the
sampling tubes again noting their posi-
tioning (+ and -).
Remove switch. Reassemble in reverse
order.

11. Pressure Switch Venturi
Carry out steps 

1, 2 and 8, as above.

Disconnect the sampling tubes and
remove the screw securing the venturi to
the flue outlet. Remove venturi by the
bottom of the 45° elbow. Reassemble in
reverse order.

12. Drain down
2 drain

points are located on the boiler. 

1 = DHW circuit drain point
2 = Heating circuit drain point

(Pressure releave valve)

13. Water filters ( Heating and DHW)
The C/H filter ensures a seal between
the return tail and the tap 

5 Fig. 2

unscrew the pipe nut and the tap nut.
Pull the tap toward you and remove the
C/H filter.
The DHW filter is located in the DHW
command 

37 Fig. 2 on the right hydraulic

assembly. Remove the clip and pull
toward you the DHW command remove
the plug and clean the filter. Reassemble
in reverse order.

14. DHW Flow switch
Disconnect the electrical connections
undo the securing clip and remove the
microswitch reassemble in reverse
order.

15. Pressure relief valve
Drain the boiler first, unscrew the safety
valve head with a 24 mm spanner.
Reassemble in reverse order.

5. Ignition Electrodes
Carry out steps 

1 and 2 as above. remove

the wiring cover undo the power lead plug
open the electrical box 2 clips. Dicconnect
leads from spark generator on PCB. Loosen
screws securing the closure plate and
remove. Remove grommet from base of
sealed chamber. Remove screw securing
electrode bracket and lift clear easing
spade connectors through the grommet.
Reassemble in reverse order, twisted
together electrodes cable at least 10 times
to avoid electrical interference.

6. Burner Assembly
Carry out steps 

1,2, disconnect electrodes

as mentionned in section 

4 and 5. Remove

two screws securing burner assembly to the
back panel of the boiler. Lift right hand back
corner first. Reassemble in reverse order.

7. Gas Solenoids
Disconnect colour coded leads. Remove six
screws. The solenoids are attached to their
base plate. Lift clear taking care not to lose
the three plungers and springs.
Reassemble in reverse order replacing the
cork gasket.

8. Fan Assembly
Remove outer case and sealed chamber
front panel (See Steps 

1 and 2). Disconnect

spade connectors noting positions. Remove
two screws securing the front of the fan
assembly and loosen screw on flue outlet.
Twist fan assembly anticlockwise to disen-
gage from flue outlet and lift clear.
Re-assemble in the reverse order ensuring
that the wiring is re-connected correctly and
the screw on the flue outlet tightened.

9. Flue Hood
Carry out steps 

1 and 2 as above. Remove

fan assembly as in step 

8. Remove the

three screws securing the angled top of the
hood to the chassis. Lift and remove taking
care not to snag the pressure switch cables.
Re-assemble in the reverse order ensuring
that the hood is located behind the combus-
tion chamber rear panel.

10. Pressure Switch

REMOVAL AND REPLACEMENT OF PARTS

1

2

3

B

B

A

A

1

2

P

(air separator)

1

2