Operating instructions

ManualsBrandsSaunier Duval ManualsBoilerEcosy 2 SB 28E

SETTINGS

Gas valve setting

All boilers are tested and factory set during ma-

nufacture. Should it be necessary to reset a gas

valve, for example after replacement, proceed

as follows :

● Shut down boiler.

● Connect a CO2 analyser to the combustion test

point on the products outlet from the heat

exchanger, see diagram 21.

Alternatively, connect a CO2 analyser to the com-

bustion test point on the flue elbow.

● Start the boiler.

● Press the «Mode» and «+» buttons simultaneously,

the letter H is displayed and the boiler is now running

at high gas flow rate.

● Allow the boiler to run for a few minutes to stabi-

lise and check the CO2 value, refer to table 4.

● At the 28E and SB28E the CO2 at high gas flow

rate is automatically controlled.

● At the 24E and SB24E the CO2 at high gas flow

rate can be adjusted. To adjust the CO2, turn the

gas valve adjuster until the correct CO2 value is

obtained according to table 4.

● Press the «Mode» and «-» buttons simultaneously,

the letter L is displayed and the boiler is now running

at low gas flow rate.

Allow the boiler to run for a few minutes to stabilise

and check the CO2 value, refer to table 4.

● To adjust the CO2, remove protective cap (b) from

the gas valve, see diagram 22. Turn the gas valve

adjuster until the correct CO2 value is obtained

according to table 4.

Note :This adjustment must only be carried out by a

suitably qualified engineer.

Bypass

The built-in bypass must be adjusted according to

the requirements of the system. 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 bypass screw (a), see

diagram 23. Turn the screw clockwise to close the

bypass.

When using thermostatic radiator valves (TRV’s), a

separate adjustable bypass of 15 mm minimum

diameter must be fitted between the flow and return

of the heating circuit. Any bypass must be fitted

before system controls.

Diagram 21

Ins 046

Diagram 22

Reg 026

Diagram 23

Reg 033

Table 4

ECOSY 24 E/ECOSY SB 24 E ECOSY 28 E/ECOSY SB 28 E

G20 G30 G31 G20

Output 6,8 kW 24,5 kW 9,9-20,4 kW 11,4-24,5 kW 8,3 kW 28,0 kW

Fan speed 1600 rpm 5300 rpm 2400-4800 rpm 2400-4800 rpm 1900 rpm 5700rpm

CO2 with sealed

casing removed 9,0 % 9,2 % 10,1-10,3 % 11,9-12,1 % 9,4 % 9,4 %

CO2 with sealed

casing fitted 9,2 % 9,4 % 10,4-10,6 % 12,3-12,5 % 9,6 % 9,6 %

Start (%) 80 % 80 % 90 % 90 % 80 % 80 %