NAYATI NGWT 3-55 Manual

INSTALLATIONS, OPERATION
and
MAINTENANCE INSTRUCTION
“DUAL“ China / Euro Gas-Rechaud
Types: NGWT 3 - 55
NGWT 7 - 55 Table ranges
NAYATI EUROPE
s.a. BDS n.v. - Exclusive distributor
39 Avenue de l'Ecuyer, B-1640 Rhode Saint Genèse
39 Schildknaaplaan, B-1640 Sint Genesius Rode
Belgium
Tél: [phone] Fax:[phone]
www.nayati.eu

page 2
1. INSTALLATION
Before installation and operation of the appliance, the following must be observed.
For EU und CH (Switzerland) applies:
The applience must be connected and operated according to national regulations. This applies for
installation, air circulation of the room and exhaustion of combustion products.
Only for CH (Switzerland) applies:
SVGW-norms for gas G1 (2002): Installations for gas
EKAS directories for liquid gas
Prescriptions from instances of the cantons (for ex. fire police)
For DE (Germany) applies:
The applience must be connected according existing installation regulations. It may only be operated in a
room with sufficient air circulation to avoid formation of unhealthy combustion products.
The following regulations, technical rules and regulations are compulsory for installation and operation of the
appliance:
Building regulations of the countries
Fire regulations of the countries
Regulations working premises
Building regulations fire technical requirements and air circulation
DVGW - Instruction G 600 (TRGI), „Technical rules for gas installations“
TRF „Technical rules liquid gas“
DVGW – Instruction G 634 „Installation commercial kitchens, gas operating installations“
Accident regulations VBG 21
Accident regulations VBG 77
Security rules kitchens ZH 1/37
Directions „Air technical installation kitchens“ VDI 2052
Regulations energy supply installations (GVU)
1.1 Directions
For the installation and adjustment of the appliances as well as for the changes of the gas types, an
authorized technician must be called. Sealed parts by the producer or authorized agent may not be touched
by the technician.
During operation the appliance must be supervised.
1.2 Place of Installation / Setting Appliance
The appliance must be placed on a stable solid platform. The platformmust be flat and horizontal. When
placed on a table, this must be of non-combustable material.
If the appliance on the wallside is connected with flexible tubes, then the appliance must be screwed to the
platform.
This fixation is a must for the Table Models.
If the appliance is placed near temperature sensitive parts (f.i. furniture, electric cables in the wall) there has
to be a distance of 100 mm to the rear wall and 200 mm to the side walls.
1.3 Gas connection
Before connecting the appliance, control if the gas type corresponds to the gas type od the place of
installation.
If this is not the case an adjustmanet must be made before starting up the appliance.
If flexible tubes are used, these tubes must be in DIN 3384. (Depending of the countries, those which are
allowed)
In the gas inlet there must be a gas stop cock, fixed in a suitable position.
Depending on national requirements, a thermo stop cock must be installed before the appliance.
After connection, all gas pipes must be checked with foam or leck sprays under pressure for indentifying gas
leaks.

page 3
2. Technical Data (valid only for DE / CH / AT)
The appliance is suitable for operation of earth- or liquid gas / Construction A1
Category II 2 ELL 3 B/P
call pressure allowed connection
pressure Ranges
Earthgas
20,0 mbar 18,0 - 25,0 mbar
Liquid gas 50,0 mbar 42,5 - 57,5 mbar
Outside this range the appliance may not be operated.
2.1 Technical Data (valid for EU)
The appliance is suitable for operation of earth- or liquid gas / Construction A1
Category II 2 ELL 3 B/P
Countries Category connection pressure
(mbar)
2. family 3. family
Earthgas Liquid gas
AT
II2H3B/P 20 50
BE II2E+3+ 20/25 28-30/37
CH II2H3B/P 20 50
DE II2ELL3B/P 20 50
DK II2H3B/P 20 28-30
ES II2H3+ 20 28-30/37
FI II2H3B/P 20 28-30
FR II2E+3+ 20/25 28-30/37
GB II2H3+ 20 28-30/37
GR II2H3+ 20 28-30/37
IE II2H3+ 20 28-30/37
IT II2H3+ 20 28-30/37
LU I2E 20
NL II2L3B/P 25 28-30
NO I3B/P 28-30
PT II2H3+ 20 28-30/37
SE II2H3B/P 20 28-30
Type Heat load Gas connection values Full fire Combustion
requirements
Exhaust
quantity
Earthgas Liquid gas Earthgas E
Earthgas H
(G 20)
HuB 0,42 m3/h
Earthgas L
Earthgas LL
(G 25)
HuB 0,49 m3/h
Liquid gas
(G 30)
HuB 0,31 kg/h
NGWT 3 - 55
15 kW 13 kW 1,59 m3/h 1,85 m3/h 1,02 kg/h 16 m3/h 18 m3/h
NGWT 7 - 55
30 kW 26 kW 3,17 m
3
/h 3,69 m
3
/h 2,05 kg/h 32 m
3
/h 36 m
3
/h

page 4
The small combustion load of the Combi Wok burner is 4,5 kW.
This results in the following flow values:
Earthgas H, E (G20) 0,48 m3/h
Earthgas L, LL (G25) 0,55 m3/h
Liquid gas (G30) 0,35 kg/h
The appliance is operated in full combustion with fixed nozzles without adjustment.
The Wok burner has no small combustion adjustment.
It operates gradual from off (out) to in (in).
For the Combi Wok burner and the pilot flame the small combustion quantity is regulated for liquid gas with
fixed nozzles. For earhgas the nozzles are adjusted.
3. Instruction of Users
The user must be instructed how to operate the appliance. The instruction for use must be kept to the user.
The user must be told that after construction changes in the room, which affects the combustion supply, the
operation control must be carried out.
4. Operation
4.1 Operation elements
A
A= Gas cock with handle
4.2 Start up Wok burner
Before operation the main gas cock on the appliance must be opened.
Then press the knob of the safety tap “A“ in and keep the knob pressed in.
With ignition pistol start up pilot flame. After pilot flame burns knob “A“ to remain pressed in for 15 - 20
seconds. If after releasing knob “A“ the pilot flame goes out, you have to repeat the ignition process.
Now turn gas valve handle “B“ anti clockwise to position “ON“, the Wok burner will ignite.
Attention! Do not lean over main burner during ignition process.
The high flame could lead to burns.

page 5
4.3 Closing of burner
If the burner is only temporary to be cut, the gas cock with handle must be placed clockwise into position,
sothat the appliance remains operable.
For longer periods of interruption, the gas cock with handle must be placed into position - O -. The main gas
armature is to be closed.
5. Important Notice
The appliance is for commercial use and should be operated by qualified staff.
During operation the appliance must be attended.
It is necessary to have the appliance checked at regular intervals.
The time of checking depends on the use.
The checking must take place at least once a year.
It is not alllowed to use pots with flat bottoms on the Wok burner ring.
During full combustion without Wok pots on it, the flame extends over the Wok ring. During full combustion
with Wok pots on it, the flame extends to the side. In both cases burns to the staff are possible when
careless.
In case of problems, the appliance must be cut off. The main gas cock must be closed and the service
engineer is to be called.
An eventual change of the gas type may only be carried out by the producer or ist service agent.
5.1 ATTENTION – EXPLOSION RISK !!!!
It is strictly forbitten to cover the burners or drawers below or the air holes on the side walls, with Alu or
silver foil or similar materials.
This causes a wrong air circulation and gas combustion and overheats extremly the entire appliance and the
function of the burners will happened.

page 6
6. Cleaning (see Photo below)
Bevor cleaning all armatures must be placed in position -O-. The main gas cock is to be closed. The
cleaning should be carried out after each use of the appliance. Food and Fat rests are to be removed.
Clean with warm water, if required some detergent, non agressive cleaner.
For cleaning do not use steel wool or scraper, since corrosion could occur also on stainless steel.
Pay attention that main burner and pilot flame are not dirty. If required burner must be cleaned with non
agressive detergents. The appliance may only be operated again when fully dry.
If the appliance is not used for longer periods, all steel parts should be treated with an oil drenched cloth,
leaving a protective film against corrosion.
➪Attention! Don’t clean the range with high pressure water.
The range will be have more long use life and smooth work, if you have regular clean every day.

page 7
7. Service
The appliance requires a regular service. We recommend a service contract.
Service and repairs may only be carried out by the producer or service agent with qualified staff.
For Service and repairs only original parts should be used.
During Service, security arrangements of the appliance, function of burners and operation of burning
operation is to be checked. It is to control that no lift off or back stroke of the burners in hot condition occurs.
All gas pipes and parts must be controlled for closeness. Slits of the burners and nozzles in the primary air
segment must be free of foreign debris.
The gas armatures must be checked for easy of operation. In case of heavy movements, requires the
exchange of these parts. Application of grease, in exceptional cases may only be done by the service
engineer. Sealed parts of the producer may not be touched by the service engineer. If apart from the listed
works other reparis should be required, same should be done.
Only proper handling of the appliance, regular service by service technicians, guarantees problemfree
function of the appliance with operation security.
This is also in view of legal regulations for technical equipment as well as accident regulations.
8. Behavior in disturbances
Disturbances can occur due to mistakes in the gas supply, dirtiness of functioning parts, wrong handling or
failing ignition, regulators, function of control parts.
If the gas supply is ok., all funtioning parts clean, wrong handling excluded, you have to call a service
engineer.
In case of disturbances the gas armature (main gas cock) must be closed.
Repairs may only be carried out by qualified service engineers under consideration of ruling regulations for
operation and installation.

page 8
Spareparts list for “DUAL“ China / Euro Gas burners
ds
No Description P/N° Quantity
1 Burner head NS 9001 GS.2025 1
2 Burner ventury NS 9001 GS.4237 1
3 Burnerset NS 9001 GS.8020 S 1
4 Chambre de mélange l`air GS.8000 S 1
5 Injector / nozzle for burner GS.282 .. 1
6 Safety gas cock GS.3875 1
7 ABS Knob for gas valve GS.3602 1
8 Thermocouple GS.3890 1
9 Pilot burner GS.3851 1

page 9
PROBLEM SOLUTIONS
ATTENTION – DANGER OF EXPLOSIONS !!!!
It is absolutly prohibited to use alu foil or similar to cover the burner, the pilot unit and the side walls over the
drawer.Advice it will be damaged the range!
The above cause a wrong combustion and bad gasfire, it over heat extremly the unit and a bad function of
the burners will happened.
N° PROBLEM CAUSE REMEDY
1
Pilot flame does not ignite - Gas pipe pilot flame not closed
- Pilot flame clogged
- Pilot flame head clogged
- Pilot flame nozzle clogged
- Has the main gas pipe any
gas?
- Dismantle and clean
(evt. exchange)
- clean with steel brush
(evt. dismantle and clean)
- Pilot flame nozzle (C) replace
2
Burner flame is yellow - Air regulation on nut required
- Burner is dirty
- Air regulation opening on nut
must be mininimum 15 mm
- Take out, take apart, clean
3 Burner does not burnt - Gas cock is damaged - control evt. exchange
4
Pilot flame burns, but after let
loose the security armature, the
flame does not stay
- Thermocouple dirty
- Thermocouple does not produce
voltage in millivolt
- Thermocouple is loose
- Thermocouple magnet on gas cock
defective
- clean with fine steel brush
- take apart and exchange
- again screw into position
- take apart and exchange

page 10
CONVERSION INSTRUCTION
“DUAL“ China / Euro Gas-Rechaud
Types: NGWT 3 - 55
NGWT 7 - 55 Table ranges
NAYATI EUROPE
s.a. BDS n.v. - Exclusive distributor
39 Avenue de l'Ecuyer, B-1640 Rhode Saint Genèse
39 Schildknaaplaan, B-1640 Sint Genesius Rode
Belgium
Tél: [phone] Fax:[phone]
www.nayati.eu

page 11
9. Gas conversion
The gas conversion may only be carried out by a qualified service engineer authorized by the
producer.
9.1 Technical data (valid only for DE / CH / AT)
The applience is for operation of earth- or liquid gas / Construction A1
Category II 2 ELL 3 B/P
Call pressure Allowed connection
pressure ranges
Earthgas
20,0 mbar 18,0 - 25,0 mbar
Liquid gas 50,0 mbar 42,5 - 57,5 mbar
Beyond these pressure ranges the appliance may not be operated!
9.2 Technical data (valid for EU)
The applience is for operation of earth- or liquid gas / Construction A1
Category II 2 ELL 3 B/P
Country of
destination
Category Pressure ranges (mbar)
2. family 3. family
Earthgas Liquid gas
AT
II2H3B/P 20 50
BE II2E+3+ 20/25 28-30/37
CH II2H3B/P 20 50
DE II2ELL3B/P 20 50
DK II2H3B/P 20 28-30
ES II2H3+ 20 28-30/37
FI II2H3B/P 20 28-30
FR II2E+3+ 20/25 28-30/37
GB II2H3+ 20 28-30/37
GR II2H3+ 20 28-30/37
IE II2H3+ 20 28-30/37
IT II2H3+ 20 28-30/37
LU I2E 20
NL II2L3B/P 25 28-30
NO I3B/P 28-30
PT II2H3+ 20 28-30/37
SE II2H3B/P 20 28-30
Type Heat load Gas connection values Full fire Combustion
requirements
Exhaust
quantity
Earthga
s Liquid gas Earthgas E Earthgas H
(G 20)
HuB 0,42 m3/h
Earthgas L
Earthgas LL
(G 25)
HuB 0,49 m3/h
Liquid gas
(G 30)
HuB 0,31 kg/h
NGWT 3 - 55
15 kW 13 kW 1,59 m3/h 1,85 m3/h 1,02 kg/h 16 m3/h 18 m3/h
NGWT 7 - 55 30 kW 26 kW 3,17 m
3
/h 3,69 m
3
/h 2,05 kg/h 32 m
3
/h 36 m
3
/h

page 12
The small combustion adjustment for the Combi Wok burner is 4,5 kW.
This result in the following flow values:
Earthgas H, E (G20) 0,42 m3/h
Earthgas L, LL (G25) 0,49 m3/h
Liquid gas (G30) 0,31 kg/h
9.3 Nozzle data table
Gas type Pressure
mbar
Combi-Wokburner
full comb. small comb.
Ø (mm) Ø (mm)
Pilot flame
Ø (mm)r
Countries
Earthgas H, E
Earthgas H, E
G20
G25
20
20/25
3,20
3,20
adjustable
adjustable
adjustable
adjustable
AT / CH / DE / DK / ES / FI / GB / GR
/ IE / IT / LU / PT / SE
BE / FR
Earthgas LL G25 20 3,50 adjustable adjustable DE
Earthgas L G25 25 3,20 adjustable adjustable NL
Liquid gas B/P G30 50 1,70 1,00 0,20 AT / CH / DE
Liquid gas B/P G30 28-30 1,95 1,15 0,20 DK / FI / NL / NO / SE
Liquid gas B/P G30 28-30/37 1,95 1,15 0,20 BE / ES / FR / GB / GR / IE / IT / PT
The appliance is operated in full combustion with fixed nozzles without prior adjustment.
For the main burner and pilot flame, small combustion for liquid gas is obtained with fixed nozzle, for earth
gas the nozzle has to be regulated.
9.4 Nozzle change Wok burner
Lift burner (1) abt. 10 mm and pull away from the
mixing chamber (3). Remove fixing screw (2) of the
mixing chamber (this screw can be reached from
below).
Remove then the complete mixing chamber (3) by
turning same anti-clockwise from the nozzle. Turn
the pressure ring (4) from the nozzle. Pay attention
that the built in pressure ring is not lost.
Remove then the screws (5) and take out the
complete nozzle unit.
Remove the nozzle from the nozzle carrier and
replace a new nozzle according the nozzle table for
use in the country of operation and gas type
required.
The nozzle must be fixed with a non-hardening
sealing tape. Then replace the burner by following
instructions in the opposite direction. Pay attention
also to “primary air adjustment“.
1
2
3
4
5

page 13
10.
For the Combi Wok burner (soup burner) the small combustion adjustment must be regulated to 4,5 kW for
earthgas.
The nozzle bore in the small combustion nozzle is 50 mbar and 30 mbar.
To regulate for earthgas proceed as follows:
Operate burner in small combustion.
Turn off handle of the security control knob.
With a small screw driver adjust small combustion nozzle (9) that 4 kW are obtained.
(Turn Clockwise reduces warmth load, turn anti clockwiseincreases warmth load).
The adjustment of the warmth load can be done according volume method, see flow chart.
The adjustment of the warmth load must be such that the burner in hot or cold,
ignites properly.
For changing to liquid gas the small combustion nozzle (9) turn slightly against the stroke.
11. Pilot flame adjustment
The Pilot flame must be regulated for earthgas. This is done as follows:
Pilot flame ignite covering screw (10) with washer (11). Remove with small
screw driver, nozzle (C) adjust that main burner ignites well. Turn
Uclockwise reduce gas flow, anti clockwise increases gas quantity.
When operated with liquid gas, nozzle (C) turn clockwise towards stroke.
After regulating washer (11) and covering screw (10) fix gas tight.

page 14
12. Primary air adjustment
The primary air is fixed and sealed by the producer according to the country of use
and the gas type required. The adjustment is mentioned on the packing and the
type shield.
If a gas change must be undertaken, the primary gas adjustment must follow the
table below:
Gas type Pressure
mbar
Primary air opening
in the nut
mother (B) on the injector (A)
Earthgas H, E G20 20 fully open closed
Earthgas L, LL G25 20/25 17 mm open closed
Liquid gas G30 50 15 mm open closed
Liquid gas G30 28 - 30/37 fully opened fully open
If required only miner adjustment may be undertaken.
After fixing the primary adjustment, the nut mother and the fixing screw on the injector must be sealed with
lacquer.
13. Tests
After a conversion the following requirements must be fulfilled:
Nozzle diameter and pressure must be identical to the indication of the producer
The tightness of all gas pipes and parts must be secure
Ignition, through ignition, over ignition must be guaranteed for full combustion and small
combustion operation
The flame may not lift off nor beat back to the nozzles
All burners, ignition and control arrangements must be checked for dirt, secureness and function
The closing time of the thermo electric ignition control may not exceed 60 seconds
14. Sticker
Ater a conversion of a gas type has been carried out a new sticker must be placed on the appliance which
shows clearly the new gas type and gas pressure.

page 15
PROBLEM SOLUTIONS
ATTENTION – DANGER OF EXPLOSIONS !!!!
It is absolutly prohibited to use alu foil or similar to cover the burner, the pilot unit and the side walls over the
drawer.Advice it will be damaged the range!
The above cause a wrong combustion and bad gasfire, it over heat extremly the unit and a bad function of
the burners will happened.
N° PROBLEM CAUSE REMEDY
1
Pilot flame does not ignite - Gas pipe pilot flame not closed
- Pilot flame clogged
- Pilot flame head clogged
- Pilot flame nozzle clogged
- Has the main gas pipe any
gas?
- Dismantle and clean
(evt. exchange)
- clean with steel brush
(evt. dismantle and clean)
- Pilot flame nozzle (C) replace
2
Burner flame is yellow - Air regulation on nut required
- Burner is dirty
- Air regulation opening on nut
must be mininimum 15 mm
- Take out, take apart, clean
3 Burner does not burnt - Gas cock is damaged - control evt. exchange
4
Pilot flame burns, but after let
loose the security armature, the
flame does not stay
- Thermocouple dirty
- Thermocouple does not produce
voltage in millivolt
- Thermocouple is loose
- Thermocouple magnet on gas cock
defective
- clean with fine steel brush
- take apart and exchange
- again screw into position
- take apart and exchange

page 16
INDONESIE : PT. NAYATI INDONESIA
NAYATI INDONESIA
Jl. Raya Terboyo 19
Kawasan Industri Terboyo Megah
Semarang ~ Indonesia
Téléphone : + 62 – 24 – 658 05 73
Fax : + 62 – 24 – 658 05 72
EUROPE : B.D.S. - NAYATI
EUROPE
s.a. BDS n.v.
39 Avenue de l'Ecuyer, B-1640 Rhode Saint Genèse
39 Schildknaaplaan, B-1640 Sint Genesius Rode
Belgium
Tél: [phone]
Fax:[phone]
www.nayati.eu
REPRESENTATION