5
1.9
Minimum Heat Inputs
– Natural (I
2
H) and Propane (I
3
P)
Individual Burner Heat Inputs - Natural Gas
Individual Burner Heat Inputs - Propane Gas
Configuration
kW (nett)
Btu/hr (gross)
Configuration
kW (nett)
Btu/hr (gross)
Open Top
2
7,500
Open Top
2
7,500
Solid Top
4
15,000
Solid Top
4
15,000
Twin Bullseye
4
15,000
Twin Bullseye
5
18,700
Oven
1.65
6,200
Oven
1.65
6,200
1.10 Injector Sizes
– Natural (I
2
H) and Propane (I
3
P)
Configuration
Natural Gas
Propane Gas
Pilot Burners
Open Top
6 x Ø2.3mm
6 x No 140
Oven
SIT No. 36
SIT No. 19
Solid Top
Ø2.6mm
Amal 360
Twin Bullseye
G29.2
G24.1
Twin Bullseye
4 x Ø1.4mm,
2 x Amal 150
6 x Ø0.66mm
Oven Solid
N26
L11
Oven
Ø2.6mm
Amal 360
1.11 Gas Pressure
Mbar
Inches w.g
Natural
15
6
Propane
37
14.8
A test point is located on the manifold, behind control panel. Access is gained by removing the panel as
described in Section 3.2.4.
An adjustable governor is supplied for natural gas appliances. Propane appliance pressure is controlled
by the incoming supply regulator.
For multiple burner natural gas units, set pressure at 15mbar with approximately half the total heat input
of the appliance in operation.
1.12 Burner Aeration
Fixed injectors are fitted and no means of adjusting the
full gas rate is provided. After setting working pressure
as Section 1.11. Check burner aeration.
Oven
An aeration shroud is located close to the injector at
the end of the oven burner. Check that aperture
dimension areas shown in Figure 1. This will achieve
desired cone length. If the burner is over-aerated, the
flame may extinguish at low rates. The correct full rate
cone lengths for natural gas is 25mm. Slight yellow
flame tips are acceptable on propane appliances.
Open Top
Check aperture dimension for natural and propane
gas is as detailed in Figure 2. Check that flame is
stable and there is no evidence of flame lift.
