Worcester Greenstar Ri User Manual page 40

Please note: The flue gas test point can be
accessed on the appliance flue elbow by
removing cap C
C
39
SETTING THE GAS / AIR RATIO
1.4
Inlet Test Nipple
1.5
+ –
A
1.6
MAX
MIN NORM
1.7
– +
B
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER BOSCH GREENSTAR Ri
SETTING THE GAS / AIR RATIO
THE SETTING OF THE GAS RATIO MUST BE
CARRIED OUT BY A COMPETENT PERSON.
SETTING OF THE GAS RATIO MUST NOT BE
AT T E M P T E D U N L E S S T H E
C A R R Y I N G O U T T H E C O N V E R S I O N I S
EQUIPPED WITH A COMBUSTION ANALYSER
C O N F O R M I N G TO B S 79 2 7
COMPETENT IN ITS USE.
1.4 Remove covers from the air/gas outlet
adjuster and gas valve adjuster. Connect
manometer to inlet pressure point on the
gas valve.
The boiler should be run for 10 minutes before
taking a CO measurement and compared
2
with the figure in the table below.
1.5 If required, use a flat blade screwdriver to
set the CO (A) to the figure in the table below.
2
CO settings for Greenstar Ri
2
Gas type CO setting
2
maximum
Natural gas 9.8%
+/– 0.2
LPG 11.0%
+/– 0.2
The CO must also be checked and be below
200ppm (0.002 ratio)
Measure the inlet pressure, it should be no
less than 18.5mb for natural gas and 37mb
for LPG.
1.6 Set the mode switch to minimum
1.7 Measure the CO , it should now be at the
2
figure for minimum output. If not adjust (B)
on the gas valve until correct.
Return to maximum and re-check the CO
correct set the mode switch to normal and
isolate mains supply.
Remove manometer and re-seal inlet pressure
point on gas valve.
Re-assemble and refit boiler case.
Re-connect mains electrical supply and
check boiler operation as stated in the
commissioning section of the Installation,
commissioning & Servicing Instructions.
8 716 109 699a (05/05)
P E R S O N
A N D I S
CO setting
2
minimum
9.2%
+/– 0.2
10.5%
+/– 0.2
. If
2