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TABLE II: GAS TECHNICAL DATA, PRESSURE, BURNER NOZZLES, PILOT AND IDLE SCREW
(FOR ALL GFT90 BURNERS)
Nation
Cat.
and
Nozzle
category
ENG, ICEL, DENIM,
FIN, SWED, PORT,
2H
GREECE, IRELAND
NETHERLANDS
2L
ICEL,
DENMARK,
3B/P
FINLAND,
SWEDEND
IRELAND
PORTUGAL
3+
ENGLAND
GREECE
NORWAY
3P
LUXEMBURG
3P
LUXEMBURG
3P
NETHERLAND
R.o.A. = Regulation of primary air
* Pressure regulator excluded
2.6
HOOK-UP WITH THE GAS SYSTEM
- The unit needs to be supplied with gas with the characteristics and pressure shown in Table II.
- The gas pressure is measured at the initial pressure test point with the burner on.
- The oven is tested and fitted for operating with natural gas H G20 - 20 mbar.
* N.B. Should the supply pressure vary more than +10% of the nominal pressure, it is advisable to install a pressure
regulator upstream from the unit to guarantee the nominal pressure.
- Hooking up to the gas mains must be done with a metal pipe of suitable cross-section and a shut-off valve must be installed
upstream to standards.
- After hooking up to the gas mains, check there is no leakage at the fitting points with the soap solution method.
2.6.1
DISCHARGING THE PRODUCTS OF COMBUSTION UNDER A SUCTION HOOD
UNIT TYPE: A
The gas oven should be positioned uder a suction hood whose system must have specifications in conformity with the
standards. This unit needs at least 2 m
Check the ventilation in the kitchen. It must be in accordance with current standards.
2.6.2
HOW TO OBTAIN THE NOMINAL THERMAL CAPACITY
Check whether the unit is fitted for the gas type, pressure and category corresponding to the main gas supply.
Information shown on the packing and/or unit label.
If the unit is fitted for another type of gas or pressure, you first need to transform it for working with the other kind of gas.
See Table II for the nozzle, idle screw (by-pass), primary air regulation, (X mm), pilot nozzle and nozzle pressure for the main
burner.
N.B.: The names of nozzles "2H" and "3+" are shown on the left side of Table II.
2H = G 20 - 20 mbar
3 + = G 30 - 29 mbar and/or G 31 - 37 mbar coupled gas and pressure.
In our sector we nearly always have to deal with G 31 - 37 mbar!
GB
T ype
Gas pressure
of
upstream
gas
mbar
Ø mm. Type
Nom. Min. Max.
MARKED
G20
20
17
25
G25
25
20
30
G30*
29
25
35
G31
G30*
29
20
35
G31
37
25
45
G31
30
20
35
145 / 250 K
G31
37
25
45
G31
50
42,5
57,5
130 / 250 K
(1) Including the pilot thermal capacity approx. 400W.
K = Short nozzle l = 15 mm
3
/h • kW T.C. (Thermal Capacity).
BURNER
BY-P ASS
(23 S)
R.d.A.
Ø mm.
"targhet"
X mm.
MARKED
MARKED
205 L
TA
120 R
215 L
23
120 R
145 L
TA
120
145 L
TA
120
23
120
145 L
TA
120
23
105
F = Fixed
- 14 -
PILOT
Gas pressure
Nominal
at nozzle
Thermal
with 24ST
kW (1)
Max.
Min.
100%
mbar
mbar
36
18,8
3,8
16
36
23,2
4,1
16
19
28,8
7,3
16
19
28,8
7,3
16
36,4
9,2
19
29,6
6,2
16
19
36,4
9,2
16
19
49,4
10,1
16
Nozzle marking Ø 1/100
A = Adjustable
Gas
consumption
15°C
P.T.
l/h
g/h
Min.
7,1
1694
-
6,6
1970
-
7,8
496
1262
574
1090
7,8
496
1262
654
1242
7,6
654
1242
7,8
654
1242
7,6
654
1242
TA = Open all
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