YOKOI KIKAI KOSAKUSHO Hope Exa User manual

H G 5 3 0 4 1 E
ＨＯＰＥ ＥＸＡ
EXCESS AIR GAS BURNER
HANDLING MANUALS
YOKOI KIKAI KOSAKUSHO CO., LTD.
Head Office:
2720-1, Oboraguchi, Nakashidami, Moriyama-ku
Nagoya 463, Japan
Tel: [phone] Fax: [phone]

TABLE OF CONTENTS
P
1. Confirmation,Overview and Specifications of the Unit and Accessories １
2. Safety Precautions ２～３
3. Notes for Mounting the Burner Flow Sheets ４
4. Operation Manual(Preparation,Ignition,Adjustment and Extinction) ５
5. Inspection and Maintenance(Disassembly,Cleaning and Reassembly) ６
6. Warning Plate Troubleshooting ７
7. Structual Drawing ８

- 1 -
Thank you very much for choosing HOPE EXA type Excess air gas burner.
To get maximum performance out of your new gas burner and to properly maintain and inspect the unit,
please read through this manual carefully. Keep it handy for future reference. Please ensure that
both construction company and end user will get this manual.
Inspection after Purchase
Check the name plate and the following specification table to make sure that the product is
per your order. Also check if it is free from any transportation damage.
Overview
The EXA type excess air gas burner is a nozzle-mix type burner, which allows combustion
of high excess air by adopting multi-pod air nozzle. The stable combustion makes it
suitable for a variety of industrial furnaces such as heating furnace, drying furnace, heat
treatment furnace, and hot-air producing furnace.
SPECIFICATION
T Y P E C A P A C IT Y C O N N E C T I O N M A S S
k W G A S A I R k g
E X A - 1 9 7 R c １ R c 1 1/419
E X A - 2 1 6 6 R c １ R c 1 1/2 19
E X A - 3 2 5 5 R c １ R c 2 1 9
E X A - 4 4 5 3 R c ２ R c 3 3 9
E X A - 5 7 2 4 R c ２ R c 4 3 9
E X A - 6 1 0 6 0 R c ３ 1 2 5A 8 0
E X A - 7 1 5 3 0 R c ３ 1 5 0A 8 3
●Standerd Pressure：GAS 2 ～10 kPa
AIR 6 kPa

- 2 -
Matters to be attended for safety
Before installing, trial- operating, maintaining or inspecting this burner,please learn the inside of this burner,
information of safety and other matless to be attended by reading this instruction manual and all of attached
documents.
The rank of the matters .to be attended is classifie to "Top danger"
"Danger "and "Caution" in this instruction manual.
In case of wrong perating, it is predicted that
serious dangerous situation will happen and the
operator or other people.
May die or may be seriously injured.
In case of wrong operating,it is predicted that
dangerous situation will happen and operator or
other people may die or may be seriously injured.
In case of wrong operating, it is predicted that
dangerous situation will happen and the opertor
or other people will be injured or only material
described.
NOTE, Even the matters classified to CAUTION have a possibility of causing serious results.
Then,never fail to abide by matters discaribed.
Meaning of the mark Sample
This is to tell that there is indication to in-
strut comlpulsorily your action.
ontents of the instruction must be described
COMPULSON definitely nearly. never fuel to do
This is to tell the prohibitted action.
Specifically prohibitted action are discribed.
TOUCH
PROHIBITION PROHIBITED
This is to tell that three is a thing to be at attended.
The specifically attended thing is described nerrily.
described.
CAUTION
CAUTION HIGH TEMIPE
RATURE

- 3 -
Read without foil
Never foil to exhaust the air in the farnace (pr-purge) before igniting.
Repeated ignitions may cause explosion due to the gas stagnated in the
furnace. Please install safety devices like a flame supper visor.
Never fail to cut the electricity of transformer when you take off the
ignition plug in order to i check the spark of it.
ELECTRIC SHOCK
CAUTION
Never fail to take off the site hole when igniting or firinf the burner.
※flame in the furnace may blow out.
Never touch the mounting plate of the burner and fitting parts of the pilot
burner. These area are high temperature when the burner is burning.
TOUCHING
PROHIBITED
1. Do not use the attached gasket for sering this burner.
2. Put the replaced old gaskets pouch and thrae'away therm according to the waste disposal
regulation or the waste cleaning regulation.
Never burn up them.

- 4 -
Mounting
1) Support the exterior surface of the burner tile, particularly the bottom face with fire block,
castable refractories or other appropriate materials so that the burner tile will not fall down,
2) 'When mounting the burner to the furnace, secure it by filling the space between the mounting
hole and the burner tile with the fire-resisting mortar.
Piping
1) Clean the piping thoroughly so that any seal tape, bond, chip or other materials will not be left
inside. Failure to do so may result in the malfunction of solenoid valve, governor, other valves and
parts.
2) Attach piping support when connecting the pipes so that the burner will not be under unnecessary
load.
3) The air orifice is built in to the HGS. Perform piping in such a way so that the stralght pipe
before the burner entrance will be at least 3 times longer than the pipe diameter.
Attach pressure cocks to the air and gas pressure difference detection taps (4 areas).
4) When you choose the fan, pay attention to the non-combustion air capacity listed in the catalog.

- 5 -
OPERATION MANUAL
Preparation
1) Make sure that all the gas cocks are closed.
2) Use air, nitrogen or other appropriate gas to check the leak inside the gas piping
3) Check if all the equipment for air and gas lines work properly..
4) Make sure that the gas is supplied as per specified pressure and that the gas inside the piping
has been replaced.
5) Start the blower and check if the outlet pressure is per specifications.
6) Use the control damper to set the maximum combustion (6kPa) and the minimum
combustion (0.1 ～0.5kPa).
7) Fully open the control damper and purge inside the furnace with air (You need to purge area
that is approximately 3 times larger than the furnace capacity).
8) Set the control damper to the minimum combustion.
Ignition
1) Make sure that the cock before the burner, solenoid valve and limiting valve are fully closed.
2) Ignite the pilot burner by pressing the ignition button. (Always use the pilot burner. Use of
torch or igniter rod is dangerous. Also, check if the ignition was made securely.)
3) Fully open the cock before the burner and the solenoid valve. Slowly open the limiting valve
and check if the main burner was ignited securely.
Adjustment
1) Measure the pressure difference of air orifice and acquire the air capacity from the table.
2) Calculate the required gas capacity and acquire the pressure difference of orifice that suits the
flow. Use the limiting valve to set the pressure difference. At this time, make sure to
convert the specific gravity of the atmosphere.
3) When using the equalizing valve control, slowly open the control damper to the maximum
combustion as you check the combustion status. Check the flow rates.
4) Use the flame detector to check the current value.
5) When the air ratio setting is completed, set the control damper to the minimum combustion
again. Joint the control motor and the control damper so that the necessary turndown will be
obtained.
Notes
1) The pressure inside the burner tile becomes high during the combustion, and removing the
sight hole may expose you to the flame. Pay special attention to the looseness of the sight
hole or glass daniage.
2) There are 3 types of orifices available depending on the type of gas. A plate that indicates
the orifice size is attached to the flange bolt where the gas orifice is fitted. Use the following
table to confirni the orifice size.
3) An orifice built in to the burner is intended to serve as adjustment guide. If you need more
accurate value, we recommend to install MO type metering orifice at some midpoint in the piping.
Extinction
Fully close the cock before the burner and the solenoid valve, and check if the flame has been
extinguished.
To protect the nozzle, wait until the furnace temperature falls down below 500 ℃
before stopping the combustion blower.

- 6 -
Inspection (Inspection of Nozzle and Burner Tile)
* Inspection should be performed when the furnace has been cooled. Always wear protective
gloves and other safety devices.
1 Make sure that all the powers such as of the combustion blower have been turned off.
2 Cheek if all the cocks have been closed.
3 Loosen the union and other sections of the gas piping.
4 Loosen the hex bolt that secures the Burner Plate ②and the burner body ①.
(Make sure that the burner body has been cooled before following this step.)
5 Hold the burner body ①securely and remove the Burner Plate ②. At this
time, handle it with caution so that the Nozzle Plate ④will not fall down.
(The burner body ①and the Nozzle Plate ④are not secured to each other;
removing the burner body ①releases the Nozzle Plate ④at the same time. Also, the panel may be
very hot.)
Handle them with extra caution as hot air in the furnace may blow out from between the Burner Plate
②and the burnerbody ①.
6 When the burner body ①and the Nozzle Plate ④have been removed from the Burner Plate ②,
check for any deposits of foreign particles around the air nozzle ⑤
and the gas pipe ⑥. Check for any loose parts.
Then check the burner tile:
7 Clean it free of any foreign particles. Contact us if the burner tile is damaged. It may
adversely affect the combustion.
8 Reassemble the parts when you make sure that they are not defective (Do not forget to tighten any
parts or piping).
* Check the burner and accessories as adequate, depending on the conditions of use.

- 7 -
※WARNING PLATE
Please check whether the warning plate shown below is removed from the burner body after
installation looks finished. If the warning plate was lost , please let our sales department know it.
Troubleshooting
* For details on how to inspect the burner and peripheral devices, see the user s in annual of each unit.
* Contact our Sales Department for any questions:
Tel: [phone]
Fax: [phone]

- 8 -
Structual Drawing
№ P A R T I C U LA R S Q U A N .
１ B u r n e r B o d y 1
２ B u r n e r P l a t e 1
３ B u r n e r T i l e 1
４ N o z z l e P l a t e 1
５ A i r N o z z l e 8
６ G a s P i p e 1
７ S i g h t H o l e 1