Checking The Gas Rate; Gas Rating Test; Checking For Leaks During Operation; Domestic Hot Water - Worcester 27i System Compact Installation, Commissioning And Servicing Instructions

Regulator
L.P.G.
< 4.0mbar
difference
32 - 45 mbar
Boiler inlet
2.5 mbar
drop
29.5 - 42.5 mbar
Fig. 62 L.P.G. pressures
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.

5.5.2 CHECKING THE GAS RATE

▶ The gas rate should be measured at the gas meter after the boiler has
been operating for a minimum of 10 minutes at maximum output.
▶ See Technical data section on page 6 of this manual for gas rates and
CO/CO ratios.
2
▶ Where a gas meter is not available (e.g. L.P.G.) the CO/CO
checked.

5.5.3 GAS RATING TEST

▶ Ensure all other gas appliances are isolated.
1. Set the boiler to maximum output by pressing
buttons together for at least 5 seconds.
The chimney sweep symbol (1) will be displayed at the top of the
screen and the word "Max" will flash at the bottom of the screen. The
boiler will ramp up to maximum output in 30 to 35 seconds.
≈ ≈
5 s 5 s
eco
°C
reset ok
°F
Max
1.
e
min max
Fig. 63 Setting boiler to maximum
▶ Ensure that the boiler has stabilised at maximum output.
▶ Carry out Gas rating procedures as described in "Essential Gas
Safety" third edition.
▶ If pressure and gas rate are satisfactory press the
and the boiler will return to normal operation.
– If left in the service mode the control will return to normal operation
after 15 minutes.

5.5.4 CHECKING FOR LEAKS DURING OPERATION

▶ Use an approved leak detector to check all connections for possible
leaks. The product must be certified as a gas leak testing agent.
Greenstar i System Compact - 6 720 807 726 (2013/05)
Gas Control
valve
28 - 41 mbar
1.5 mbar
drop
6720644744-45.2Wo
must be
2
and the
eco
2
1 1 3
0 bar 4
1
min max
°C
°F
Max
button again
▶ Do not allow the product to come into contact with the electrical
wiring.
5.6

DOMESTIC HOT WATER

Controlling the hot water temperature:
NOTICE: Domestic Hot Water
▶ The hot water temperature can only be controlled
when the "Optional diverter valve" kit is fitted.
The hot water temperature can be set to between approximately 40°C
and 70°C using the DHW temperature control.
5.7

FINISHING COMMISSIONING

5.7.1 REPLACING THE BOILER CASE

1. Ensure that bottom edge of the case is engaged onto the rail of the
superstructure. Slide into place.
2. Ensure that the securing points on top of the case are properly
located.
3. Tighten the bottom two screws.
2.
1.
3.
4.
5.
7.
6.
Fig. 64 Fitting case
COMMISSIONING
8.
35