Setting - Saunier Duval Combitek F 23 E Installation And Servicing Instructions

INSTALLATION INSTRUCTIONS
SETTINGS
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'.
Maximum setting
• Remove one electrical connector from the
modulating gas valve coil.
• Turn the domestic hot water temperature ad-
juster to maximum setting.
• Remove the protective
cover from the gas valve ad-
juster.
Using a 2 mm Ø rod, press in
the spindle in the middle of
screw.
• Turn nut 'B' to obtain the de-
sired pressure, see technical
data.
Minimum setting
This must be done AFTER the
maximum setting.
• Hold nut 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.
Bypass
The COMBITEK F 23 E has a built-in bypass. This must
be adjusted according to the requirements of the
system, refer to the flow rate pressure curve (dia-
gram 3). The boiler is supplied with the built-in by-
pass open a half a turn. It is adjusted by turning the
bypass screw (A), see diagram 17. 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 combitek has a switch SW1 on the main PCB
which incorporates two dip switches. Both these dip
switches should normaly be set to the Off position.
Purpose of dip switch 1 :
In the Off position the pump will be on and off with
the room stat (this is the normal position).
In the On position, the pump will be on and off with
the burner.
Purpose of dip switch 2 :
Not used in UK. Leave in off position.
14
B
A
Diagram 17
Diagram 18
A