Hobart G4SF77 Installation, Use And Maintenance Instructions page 25

TABLE II: GAS TECHNICAL DATA, PRESSURE, SOLID TOP BURNER NOZZLES, PILOT AND IDLE
SCREW (VALID FOR ALL GAS RANGE DOMINA 700 SERIES)
Nation Cat.
and Nozzle
category
ENG, ICEL, DENIM,
FIN, SWED, PORT,
2H
GREECE, IRELAND
NETHERLANDS
2L
NETHERLANDS
ICEL,
DENMARK,
3B/P
FINLAND,
SWEDEND
NORWAY
IRELAND
PORTUGAL
3+
ENGLAND
GREECE
LUXEMBURG
R.o.A. = Regulation of primary air
* Pressure regulator excluded
The gas unit should be installed under a draft hood whose system ought to have characteristics complying with Regulations.
(This unit requires a draft of at least 2cu.m/hr l kW T.C. (T.C.= Thermal Capacity).
Check kitchen aeration: it should be in compliance with law in force.
2.6.2 HOW TO ACHIEVE THE NOMINAL THERMAL CAPACITY
Check whether the unit is fitted for the gas type, pressure and category corresponding with the main gas supply.
Indication shown on packing and/or the label of the unit.
If the unit is fitted for another gas type or pressure, you need to first effect a change over to the other gas type.
See Table II for the nozzle, the idle screw (bypass), the primary air regulation, (X mm), the pilot nozzle and the 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= G20 - 20mbar
3+= G30 29mbar and/or G31 - 37mbar coupled gas and pressure.
Table II shows the types of gas and pressure for all burners and respective nozzles, the X mm distance for the adjustment of
primary air (see Fig. 3), the idle screw (bypass), the pilot nozzle, the maximum and minimum pressure at nozzle, the maximum
and minimum thermal capacity, and the gas consumption in l/hr (15°C) or in g/hr in the case of L.P.G.
Attention: If the incoming gas' "dynamic" pressure to the unit is lower than the minimum pressure on Table II, connection is
prohibited; furthermore, the fitter should notify the gas Company that the supply pressure is too low.
N.B.: Should the pressure vary more to than +10% of the nominal pressure, e.g. for G20- 22mbar, it is advisable to mount a
pressure regulator ahead of the unit in order to guarantee the nominal pressure.
Should the supply pressure exceed the maximum pressure on Table II, e.g. for G20- 25mbar, notify the gas Company.
Make sure the inlet and nozzle pressures agrees with the values shown on Table II.
2.7 PRESSURE CHECK
INCOMING PRESSURE CHECK (Pe) Fig. 1
Pressure is measured with a manometer 0 ÷ 80mbar (precision at least 0.1mbar).
The pressure socket Fig. 1 is located on the G 1/2" gas ramp behind the panel; undo the screw (A) of the pressure socket (B),
attach the silicone rubber to the manometer, ignite the burner (Fig. 3 position 4) and take the incoming "dynamic" pressure.
Fasten the screw (A) back with a gas washer (C), check gas sealing with bubble soap.
Type Gas pressure
of upstream
gas mbar
Ø mm. Type
Nom. Min. Max.
MARKED
G20 20 17 25
G25 25 20 30
175/250K
G30* 29 25 35
G31
G30* 29 20 35
G31 37 25 45
(1) Including the pilot thermal capacity approx. 400W.
K = Short nozzle
SOLID TOP BY-PASS PILOT
BURNER (22 S)
R.d.A. Ø mm. "targhet"
X mm. MARKED MARKED
170K 20 95
20 95
115K 20 65
115K 20 65
l = 15 mm F = Fixed
- 25 -
Gas Nominal
pressure at Thermal
nozzle kW (1)
with 25ST
Max. Min. 100%
mbar mbar
27 19,2 1,5 5,5
27 23,6 1,8 5,5
19 28,8 2,4 5,5
19 28,8 2,4 5,5
36,8 3,0
Nozzle marking Ø 1/100
A = Adjustable
Gas
consumption
15°C
T.C. l/h g/h
Min.
1,55 582 -
1,40 676 -
1,55 170 433
196 376
1,55 170 433
223 427
TA = Open all
GB