Saunier Duval THEMA F 23 E Installation Instruction
17
SETTINGS
CHANGING GAS TYPE
Gas valve setting
All boilers are tested and factory set during manu-
facture. Should it be necessary to reset a gas valve,
for example after replacement, proceed as follows:
• Shut down boiler.
• Connect a suitable pressure gauge as described
in 'Commissioning'.
All boilers are tested and factory set during manu-
facture. Should it be necessary to reset a gas valve,
for example after replacement, proceed as follows:
• Shut down boiler.
• Connect a suitable pressure gauge as described
in 'Commissioning'.
Maximum setting
• Remove one electrical connector from the
modulating gas valve coil.
• Turn the domestic hot water
temperature adjuster to maxi-
mum setting.
• Remove the protective cover
from the gas valve adjuster.
Using a 2 mm Ø rod, press in the
spindle in the middle of screw M,
see diagram 25.
• Turn nut 'B' to obtain the de-
sired pressure, see technical
data.
• Remove one electrical connector from the
modulating gas valve coil.
• Turn the domestic hot water
temperature adjuster to maxi-
mum setting.
• Remove the protective cover
from the gas valve adjuster.
Using a 2 mm Ø rod, press in the
spindle in the middle of screw M,
see diagram 25.
• Turn nut 'B' to obtain the de-
sired pressure, see technical
data.
Minimum setting
This must be done AFTER the maximum setting.
• Hold not B to prevent from turning, turn nut 'A' to
obtain the desired pressure, see technical data.
This must be done AFTER the maximum setting.
• Hold not B to prevent from turning, turn nut 'A' to
obtain the desired pressure, see technical data.
After adjustment, refit the cover to the gas valve
adjuster and refit electrical connector.
adjuster and refit electrical connector.
Bypass
The THEMA F 23 E has a built-in bypass. This must be
adjusted according to the requirements of the sys-
tem, refer to the flow rate pressure curve (diagram
3). The boiler is supplied with the built-in bypass
open a half a turn. It is adjusted by turning the by-
pass screw (a), see diagram 26. Turn the screw
clockwise to close the bypass.
When using thermostatic radiator valves (TRV's), it
is recommended that an additional, adjustable
bypass of 15 mm minimum diameter is fitted be-
tween the flow and return of the heating circuit,
see diagram 6. Any bypass must be fitted before
system controls.
The THEMA F 23 E has a built-in bypass. This must be
adjusted according to the requirements of the sys-
tem, refer to the flow rate pressure curve (diagram
3). The boiler is supplied with the built-in bypass
open a half a turn. It is adjusted by turning the by-
pass screw (a), see diagram 26. Turn the screw
clockwise to close the bypass.
When using thermostatic radiator valves (TRV's), it
is recommended that an additional, adjustable
bypass of 15 mm minimum diameter is fitted be-
tween the flow and return of the heating circuit,
see diagram 6. Any bypass must be fitted before
system controls.
PCB Settings
The PCB on the Thema F 23 E can be set to operate
in different ways to suit individual installations. The
dip switch SW1, see diagram 27, should be set as
follows:
The PCB on the Thema F 23 E can be set to operate
in different ways to suit individual installations. The
dip switch SW1, see diagram 27, should be set as
follows:
1 - OFF
4 - OFF
2 - ON
5 - OFF
3 - OFF
6 - OFF
Should it become necessary to change the gas type, a modification kit will be required.
This modification must only be carried out by a suitably qualified engineer.
This modification must only be carried out by a suitably qualified engineer.
Conversion: Natural Gas (G20) to G30/G31
Part No. 86161
Reg 013
a
Diagram. 26
Diagram. 27
Reg 055
1
2 3 4 5 6
SW1
ON
DIP
Mec 121
A
B