TSS Calydra Comfort 100 Nat, Installation And Operating Instructions Manual

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4
WIRING
DIAGRAM
When there is a need for hot water while
the heating is on, it is only necessary to
turn on a hot tap. The heating will be inter-
rupted momentarily while the hot water is
being delivered. The boiler will switch
back automatically to heating when the
tap is turned off.
Note: If the boiler has been turned off for
some time the first attempt to light it may
result in a lockout
If this happens
press the reset button 30 and the boiler
will light.
To Turn Boiler Off Completely
1) Turn the main switch
23 to the off posi-
tion O.
2) Turn the gas tap
36 (fig.2) OFF.
Domestic Hot Water Mode
In order to supply hot water, the main
switch
23 (fig. 4) must be in ON position I.
This will be confirmed by the green indica-
tor light
27 (fig. 4). Turn DHW temper-
ature adjustment knob
24 clock wise to
establish the green DHW indicator 32 (fig.
4).
The hot water temperature in the mini
cylinder can be adjusted between 40 and
60°C using control knob
24 (fig 4).
When a tap or shower is turned on, the
flow of mains water, above 2 litres per
min., will activate the 3 way valve
17
(fig. 4) to move to the DHW position. The
pump will now circulate primary water
heated by the main heat exchanger
through the secondary heat exchanger.
The first stage solenoid
a (fig. 6) and safe-
ty solenoid c (fig. 6) open together to allow
gas to the burner. The ignition sequence
begins and a continuous high speed spark
ignites the gas. As soon as a flame is
detected the orange indicator bulb
28
(fig.4) will light and the second stage sole-
noid
b (fig. 6) opens to allow the full gas
rate. If a flame is not detected, after 8 sec-
onds, the security solenoid closes and
shuts off the gas. The red lockout indica-
tor bulb
29 (fig.4) will show. Over 2
l/min, the domestic hot water temperature
is controlled by the hot water control ther-
mistor
9 (fig.6) and the heating control
thermistor 16 (fig.6), but dependant upon
to the position of the DHW temperature
adjustment knob
24 (fig.4). This system
anticipates the changes of temperature in
the secondary heat exchanger and
ensures accurate temperature regulation.
When the tap is closed the burner is extin-
guished and the pump stops. (unless the
mini cylinder thermistor is calling for heat,
in which case the burner will remain on at
a low rate and the pump will continue run-
ning until the mini cylinder thermistor is
satisfied). The boiler will now stay in the
hot water mode for 30 seconds to be
ready for a subsequent draw off
Priority is given to a demand for hot water.
This will interrupt the central heating for
the duration of hot water delivery or recov-
ery of the mini cylinder.
When the boiler has been in standby in
Hot Water Mode for some time or when
drawing DHW at flow rates of less than
2 l/min the temperature in the mini cylin-
der will eventually decrease and the
TSS® control thermistor
18 (fig.6) will call
for heat. Bringing the pump and burners to
operate, until the cylinder thermistoris sat-
isfied. this is quite normal.
Central Heating Mode
To be able to supply heating, the main
switch
23 (fig.4) must be in I position. This
will be confirmed by the green indicator
light
27 (fig.4.) Turn the temperature
control knob 25 clock wise to establish the
green heating indicator 33 (fig.4).
When there is a demand for heating
(either from the room thermostat or the
clock) and the boiler temperature control
is calling for heat. The pump starts allow-
ing the ignition sequence to begin. The
first stage solenoid
a (fig.6) and safety
solenoid
c (fig.6) open together to allow
gas to the burner. The ignition sequence
begins and a continuous high speed spark
ignites the gas. As soon as a flame is
detected the orange indicator bulb
28
(fig.4) will light. After 45 seconds the sec-
ond stage solenoid
b (fig.6) opens to allow
the full gas rate. If a flame is not detected,
after 8 seconds, the security solenoid
closes and shuts off the gas. The red lock-
out indicator bulb
29 (fig.4) will show.
The central heating flow temperature is
controlled by the central heating control
thermistor
16 (fig.6). The boiler has been
designed to minimise cycling and will not
attempt to relight for at least 3 minutes
after the boiler thermostat has been satis-
fied (it is possible to reduce the time to 30
s if necessary). When the room thermo-
stat is satisfied the burner will switch off
and the pump will remain running for a fur-
ther 4 minutes before it to stops.
NB : It is possible to override the 3 minute
delay by pressing the RESET button
30
(fig. 4)