Kiturami KRP-20A User manual

KITURAMI
User’s Manual
- KRP-20A
Make sure to keep the user’s manual in the vicinity of the boiler, after reading it.
The user’s manual describes the features of the product and the
safety requirements. Please read and make sure you fully understand
the user’s manual before using the products to ensure an extended
lifecycle.
Pellet
KITURAMI Wood Pellet Boiler
Wood
PELLET BOILER

Thank you for purchasing a KITURAMI boiler. Please carefully
read and make sure you fully understand the user’s manual to ensure correct
operation and maintenance of the product, and keep the manual safe. If the
boiler operates abnormally or you have any questions about its functions, etc.,
please refer to the manual.
03 Structure and name
04 How to operate
12 Precautions for operation
14 How to clean/install
15 How to install
19 Specification for wood pellet boiler
20 Troubleshooting
24 Commissioning
Precautions for Safety
The user’s manual uses symbols to indicate that caution should be exercised to prevent accidents
caused by incorrect operation, or damage to the users and their properties. Please carefully read
and make sure you fully understand the symbols and their meanings to ensure correct operation of
the product.
The precautions are classified into three categories: “DANGER,” “WARNING” and “CAUTION.”
DANGER
WARNING
CAUTION
This symbol indicates hazardous situations where severe injury to or the death of the user may result.
This symbol indicates the possibility of severe injury to the user.
This symbol indicates the possibility of minor injury to the user or damage to the product
Structure and name
Cleaning port
Controller
Internal circulation pump
Hot water coil
Screw set
Burner
Ash tray drawer
Hopper lid
Fuel tank (hopper)
(200 kg)
Features
Accessories: Cleaning tools, user’s manual, cleaning brush, water draining tee, and room thermostat
Heat exchanger
High efficiency in Korea
-Certified for heating efficiency of 82% under the certification test of the Korea Environmental
Industry and Technology Institute (20K)
Application of multi-channel mode to prevent flame counter-flow
The apparatus incorporates the multi-channel mode to prevent flame counter-flow. The
burner fuel feed pipe is made of a special heat-resistant quarter pipe to allow easy
monitoring of flames in the burner.
Application of a control system and actual load apparatus
A blower of high DC voltage is used to reduce the quantity of sludge in the ash tray, thereby
extending the cleaning cycle. An actual load apparatus is used for the feed motor and the
heater, which triggers the safety shut-off device in the event of overload to prevent damage to
the machine.
Application of internal circulation pump exclusively for hot water supply
The internal circulation pump operates when supplying hot water in order to uniformly
distribute heat throughout the heat exchanger. This design enables the effective supply of hot
water

Initialization time
LED
How to operate
Names of components of controller
Lighting upon verifying and setting initial fuel
feed time andAutomatic recovery to water
temperature indication after 5 sec.
Warning
display
<8P connector>
1 Internal CP
power
2 CH CP
power
4 Fuel feed
6 Internal CP COM
7 CH CP COM
8 Fuel feed COM
Heater power
power
<12P connector>
1 Overheat
2 Infrared
3 ROOM(-)
4 ROOM(+)
5 VOD
6 Low level
7 Water temperature
8 GND (water
temperature, overheat)
9 GND (infrared)
10 Empty
11 Liquefied overheat
12 Low level ground
1 Heater monitoring, 2 GND
3 GND, 4 Fuel supply sending
Power distribution
switch
Display connector
External
start contact
Capacity
setting switch
Exhaust power
How to operate
Name
NO Function Remarks
Power
/restart
Setting
Fuel feed
ON/OFF
Blower
ON/OFF
UP/
DOWN
Fuel feed
LED
Blower LED
Fuel
feed Operation time
LED
LED
Shutdown time
Operation/warning
LED
LED display
Used for power
supply and restart
Fan off upon main power off
Fan off after 10 minutes
upon room power off
Used for initializing, starting,
shutdown, and fuel time setting
Keep pressing the button for 5 sec.
when setting.
Main
power
ON
Main
power
OFF
Main
power
ON
Main
power
OFF
Inoperable
Keeping pressing the button for 5 sec
– converted into manual mode
Keeping pressing the button for 5 sec.
– converted into manual mode
(FND OFF in manual mode)
Keeping pressing the button for 5 sec.
– converted into manual mode
(FND OFF in manual mode)
Allowed to turn on/off fuel feed`
manually in manual mode
Fuel supply kept ON for 3 min. only in
manual mode
Allowed to turn on/off exhaust fan
manually in manual mode
Release upon turning the power
button on/off
Used for verifying and setting
initialization, start, shutdown fuel time
Lighting upon fuel feed ON
Lighting upon blower ON
Lighting upon verifying and setting fuel feed and
operation time Automatic recovery to water
temperature indication after 5 sec.
Lighting upon verifying and setting fuel feed and
operation time Automatic recovery to water
temperature indication after 5 sec..
Lighting upon operation or
warning
Indicating water temp., initialization, operation,
shutdown time, safety triggering
Setting initialization, start and
shutdown time
Setting
Setting
Setting
17 sec
1 sec
13
Flashing upon warming (0.5 sec. ON,
0.5 sec. OFF)
Indicating in order of 1°C (0°~99°C)
45°C
(summer)
55°C (fall)
65°C
(spring)
75°C (early
winter)
85°C (winter)
Water temp.
setting
(CTR-5700)
Operating temperature of blower, exhaust fan, and circulation pump at individual
settings of water temperature (water temperature set at CRT5700PLUS)
Blower Circulation pump Remarks
38°C or lower
48°C or lower
50°C or higher
55°C or lower
65°C or lower
75°C or lower
39°C or lower
57°C or lower
67°C or lower
75°C or lower
49°C or lower
55°C or higher
65°C or higher
75°C or higher
85°C or higher
45°C or higher
55°C or higher
65°C or higher
30°C or higher
35°C or higher

Press the
season selector
button and then
set up the
season ,
How to operate How to operate
Names of components of room thermostat(CTR-5700PLUS)
Function display
Displays operation functions, current temp.
and desired temp. Displays reserved
operation/shutdown time, season selection
and number for failure diagnosis
Button for selecting functions of Room
Reservation and Outing
This button is for selecting the Room, Reserv-
ation and Outing functions.
Button for selecting bath function
This button is for selecting the bath functions.
Up/Down button
This button is for changing the settings for each
function
Season selection (heating water temperature)
button
This button is for setting the heating water temp-
erature in the boiler
Reservation button
This button is for changing reserved operation and
shutdown time
Power button
This button is for turning power on/off; it is used
when restarting the boiler after correcting a failure
of the boiler
(Restart allowed up to 3 times in sequence; restart
allowed after 5-minute’s standby)
How to use the function of room thermostat
Use the [ ] button to display on the screen.
Set the desired temperature with the Up
(▲)/Down (▼) button.
(The boiler starts operating when the desired
temperature is higher than the current temperature.)
Press the Season Selection button to set the
desired heating water temperature.
Hint for boiler operation
Season Selection function
Function for setting heating water temperature for heating of the boiler with Room or Reservation function
heating water
temperature
Season Summer Fall Spring Early winter Winter
Operation display
This is for lighting when the boiler is under
operation conditions for each function
1
4
5
6
7
8
2
3
(By each pressing of the function button,
lamps are turned on in the listed sequence.)
>>>
(At each pressing of the season selector button,
the season changes:
> > > > )

How to operate How to operate
How to use Reservation function
Press the [ ] button until ‘Reservation’ is
displayed on the display.
(The operation lamp lights at the predetermined
time, and reserved operation starts.)
▶Example: Operate the boiler for 20 minutes, shut
down operation of the boiler, and then operate
the boiler again for 20 minutes.
▶How to change time for reserved start
Press the Reserve Set button.
When the reserved shutdown (min.) time
flashes, press the Up (▲)/Down (▼) button
to set the desired time (min).
▶When you complete setting in this condition, the
reserved shutdown time operates first.
Hint for boiler operation
Hint for boiler operation
Press the Reservation Setting button.
When the reserved shutdown (min.) time
flashes, press the Up (▲)/Down (▼) button
to set the desired time (min.).
▶When you complete setting in this condition, the
reserved shutdown time operates first.
Utilizing Reservation function
The Reservation function enables savings on fuel costs by operating the boiler for a specified number
of hours by setting the operation time and the shutdown time of the boiler.
(The operation time and the shutdown time will appropriately be adjusted dependent upon the season
and the insulation conditions of the houses.)
Press the [ ] button to display ‘Outing’.
(The Outing function is capable of maintaining the
room temperature at the minimal level, and of
preventing a rupture of the boiler.)
Function of preventing frozen rupture
The function for preventing a rupture of the boiler during freezing weather conditions maintains the
proper temperature of the boiler body, the floor heater pipes, and the pipes connected to the heating
pipe, thus preventing them from rupturing in freezing conditions. When you leave your home in the
winter season, you should leave the power cable of the boiler plugged in.
※When you set the room temperature to 10 to 15℃during an absence from home, you can prevent
the boiler from rupturing due to extremely low temperatures.
▶The function of preventing a rupture in freezing weather does not operate in any of
the cases described below
-In the event of a power failure, or when the power cable of the boiler is not plugged in.
-In the event of poor insulation of the water feed pipes or exposed pipes.
How to use Outing function
If there is no specified time for arbitrary
operation, the boiler operates its function
independently of the settings.
▶When you complete setting in this condition, the
reserved shutdown time operates first.
Press
Reservation
Setting button
and then set the
reservation time

How to operate How to operate
Use of Bathing Function Common cautions
If you wish to use hot water of sufficient volume, press
the Bathing button to select the bathing function.
If you leave the bathing function on for two and a half
hours, the boiler returns to the function previously
selected.
The pressure of the water feed should be 78 - 147 kPa
(0.8 - 1.5 kgf/㎠). If the water pressure is higher than
the proper pressure, install a reduction valve.
Hint for boiler operation
Cautions for use of bathing function
• Pay special attention not to scald yourself when using hot water.
• When you open the tap after selecting the bathing function, hot water may be released.
•Take particular care to protect children and elderly people from scalding water.
• When you use hot water for an extended period in the room heating mode, lukewarm water
may be supplied.
• When you turn the power on and off while using the bathing function, the operation will be returned to
the previous mode of the bathing function.
WARNING
Use the power outlet exclusive for the boiler, and be cautious for leakage
Never disassemble, repair or modify without approval of the manufacturer
Never touch the flue while you operate boiler
Do not place combustible or inflammable materials in the vicinity of the boiler
Cautions when using the bathing function
The operating power is AC 230/50Hz. Operate the boiler only after checking
the voltage.
Do not touch the power cable or operate the boiler with wet hands to avoid electric
shock. Never clean the boiler with water as a leak, shock or failure of the boiler may
result.
Install a fire extinguisher in the boiler room.
Do not stack wooden materials or place inflammable or combustible materials in
the vicinity of the boiler, and keep the area surrounding the boiler clean.
Shock or fire may result.
Contact the after-sales service center when the boiler needs repairing.
You may get burnt.
Take care not to get burnt when using hot water.
Do not drink hot water.
Hot water may suddenly be released when you open the tap after setting the
bathing function.
Take particular care to protect children and elderly people from scalding water.`
Danger
WARNING
WARNING
WARNING
WARNING
MUST DO

12
Prevent frozen rupture during winter season.
The boiler shall be inspected once a year.
Precautions for operation
• If the product is connected to the pipes, and the pipes are fully filled with water,
connect the power cable to the outlet. If there is insufficient water in the pipes,
then supply water to the pipes in accordance with the water makeup method.
Operating the rupture prevention circuit when the pipes are filled with insufficient
water may cause the pump to run idle or cause overheating or failure of the
pump.
• Fully insulate the pipes.
•Take the appropriate actions to prevent a frozen rupture by, for example,
winding heating coils around the exposed pipes in the cold area.
(It is also desirable to install the pipes adjacent to the heating pipes for insulation.)
• Do not wrap the water drain valve with an insulator.
• When you do not use the boiler for an extended period, drain the water from the
boiler to prevent a frozen rupture, and disconnect the power cable from the
outlet.
•The exposed pipes should be wrapped with an insulator 25mm thick or more to
prevent the pipes from freezing.
(50 mm or more in cold areas)
• If you leave your home for a number of hours, open the hot water tap in the
kitchen slightly to allow a small volume of water to flow into the hot water pipe to
prevent a frozen rupture of the tap water pipe.
• Request your distributor to conduct periodic inspections of the boiler (i.e., once
or twice a year).
•You can operate the boiler safely only when the boiler has been properly
inspected.
• Request your distributor to conduct periodic inspections of the fire tube, and to
clean the burner once or twice every six months.
WARNING
CAUTION
13
8~6mm
≤32
640
≤0.7
600
≤1.5
51≤01≤
)9.61≥(040,4≥)0.81≥(003,4≥
550
≤3.0
500
≤6.0
6 ~ 25
mm
kg/㎥
%
%
kcal/kg
(MJ/kg)
Precautions for operation
Precautions for operation
Keep the pellet away from water or moisture
Use the fuel of class 1 only
Never let foreign materials to be introduced into the boiler when you feed the fuel
• Pellets exposed to water or moisture become sawdust powder and thereby lose
their fuel property.
•
• Use of quality wooden pellets guarantees failure-free operation of the boiler and
ensures the extended lifecycle of the boiler. It is recommended to use wooden
pellets of class 1 or 2 for boilers manufactured and distributed in Korea. It is
essential to use wooden pellets of the quality recommended by the boiler
manufacturers.
• Never allow foreign materials to enter the fuel storage bin when you are feeding
fuel into the bin, including gloves, bark, and any part of the gunny bag.
•The machine may fail or a safety shutdown (Error 03) may result.
• Remove any foreign material and then restart the machine.
WARNING
WARNING
WARNING
Characteristics
Apparent density
Class 1 pellet Class 2 pellet Class 3 pellet Class 4 pelletUnit
Diameter
Length
Ash content
Moisture
Calorie
※ Use pellet fuel of Φ6 only.
You pour the powder into the hopper and operate the boiler, the performance
of the machine may be seriously affected, including a power reduction and
the generation of excessive ash.

How to clean/install How to install
Cleaning combustion chamber
Push down by using steel
brush is OK!
Open the lid of the cleaning port
before cleaning.
Fig. 1
[How to clean]
Stop operation of the boiler,
make sure the flame is fully
extinguished, and remove the
buffle plate from the fire tube.
Clean the combustion cham
ber with a steel brush to save
on fuel costs.
[Interval of cleaning]
① Removal of sludge from the
burner and cleaning of the
ash tray: 2 – 3 times a week
②Cleaning of the dust
collector: Once a week
③Cleaning of the cleaning
port of the fire tube: Once
a month
※Caution: Be cautious for preventing burn when you open and close the lid of the cleaning port.
Installation
▶Conditions to be checked prior to installation
The product shall be installed by authorized engineer pursuant to the methods stipulated in the user’s
manual.
• Install a boiler suitable for the purpose of use and the CH area.
• Install the boiler in a location such that exhaust gas or noise from the boiler does not cause
inconvenience to the users or to residents in the vicinity of the boiler’s location.
• Do not install the boiler in a location adjacent to areas frequently accessed by people, such as a
staircase or emergency exit.
• Secure sufficient space for the operation, inspection and repair of the boiler (1 m or more at the front,
rear, and left- and right-hand sides of the boiler).
•The use of water (for CH) containing a large quantity of lime or salinity causes corrosion of the
product. Always use tap water if possible.
Use the outlet exclusive for the boiler
Prevent the flue from contact with combustible materials
Install the boiler in a boiler room, if any
Drainage of boiler
Keep the floor level by making use of incombustible materials such as cement blocks prior to installing
the boiler.
Make sure throughly for keeping pipe warmth of the Boiler.
Otherwise, fire may result.
Otherwise, fire may result.
Install the boiler in a boiler room if possible to prevent exhaust gas from being
introduced into the living room.
Do not install the boiler in a bathroom or a space without a vent. Lack of oxygen
causes incomplete combustion.
Finish the contact points with an incombustible insulation material when installing the
flue to prevent fire.
Never install the boiler in an outdoor environment so as to prevent a rupture due to
freezing.
If the capacity of the boiler is deficient for the heating area, the safety valve may open
often. Install a nitrogen tank suitable for the capacity. (Overflow)
WARNING
Connect hoses from the safety valve and the air vent to the sewage pipe on the floor to
drain water.
Install the boiler at a location 50 mm above the floor.
When installing the boiler directly on the floor, the support of the boiler may be
corroded, thereby reducing the lifecycle of the boiler.
The pipe may be exposed to the risk of a rupture due to freezing.
The exposed pipe should be wrapped with an insulator thicker than 25 mm to prevent
the pipe from freezing (50mm in a cold area).
Incombustible material
More than
50mm

16
3m
1m
T-pipe
Drainagedevice
1mor longer
Shorter
than 1 m
Drainagedevice
1mor longer
3mor longer
Wind pressurezone
< T h e d i s t a n c e l e n g t h
b e t w e e n r a f t e r s a n d ce i l i n g >
How to install
Installation of flue
Chimney
Drainage device
Install the device with
inclination of 5 degrees.
Install the flue at a position 3 meters
above the top of the boiler, and use a
T-pipe on the end of the flue to prevent
incomplete combustion caused by head
wind.
Cautions for installation
Warning: Installation of additional flue
Distance
Distance
Distance
Distance
If there is a tall building or an obstacle within 1 m of the flue,
install the flue 1 meter higher than the roof of the building.
• Install the flue at a location 3 meters or higher than the top of
the boiler
.
•The height of the installed flue should be greater than three
times the horizontal length.
If the flue is installed in a wind pressure zone, excessive soot
resulting from incomplete combustion may result, thus reducing
operational efficiency, oafety shutdown may be triggered, causing
abnormal operation of the boilerr To prevent this, the flue should
be installed in a position outside the wind pressure zone.
.
17
▶
How to install
Standard piping diagram
Closed heating circuit
※The use safety valve, be sure to set
its pressure at 2.5 kgf/㎠ and internal
pressure below 1 kgf/㎠.
If the safety valve operates frequently due to an increase of the pressure inside the pipe, check the nitrogen level
inside the nitrogen vessel, and fill the vessel with nitrogen if required.
- Install the safety valve, the nitrogen valve, the pressure gauge and the air vent in compliance with the specifications.
A supplying water valve with the function of a check valve or a check valve should be installed on the makeup pipe.
Fan coil
Tap water
inlet pipe
DHW(domestic hot
water) supply pipe
Bathtub
Central heating pipe
Nitrogen vessel
Air vent
Circulation Pump
Central
heating
return
Supplying central
heating
Manual water
supplying valve
Safety valve
(2.5kgf)
Supplying
water
1mor longer
1. Clearance greater than 30 cm should be ensured from the
flue to prevent contact with combustible materials, and
the flue should be finished with ncombustible materials.
2. Sudden heat may be emitted by the flue when supplying
sthe fuel. Do not store inflammable or combustible
materials in the vicinity of the stove pipe. Install the
flue, taking care to ensure sufficient clearance from
the flue.
※If the flue is longer than 4 m with two bends, increase the diameter of the flue
(Ø150 → Ø200 , Ø200 → Ø250).
Install the flue in such a way that the flue is free from the
wind pressure zone, rain or wind.

18
■
■
How to install
Caution for piping WARNING WARNING
Install the Nitrogen vessel at a location 1 m above
the top of the boiler.
(Install the vessel at a location 1 m above the pipe on
the floor when you install the vessel in a cellar.)
The supply line of hot water shall be connected to
the water tank on the rooftop, not directly to the tap
water line.
Do not use the check valve on the pipe of makeup
water and discharge.
The water pressure in the DHW(domestic hot water)
supply pipe shall be kept at 0.6 – 1 kg/cm . Install the
reduction valve when using the supply water pump,
or making direct connection to the tap water line.
Use the tees on the heating outlet of the heating pipe
and the discharge pipe to install the expansion pipe
on the separated pipe.
(Install the natural circulation preventing pipe when
installing at a cellar.)
Use the circulation pump with appropriate capacity,
and install the discharge valve.
Use the expansion
pipe larger than 20A.
When connecting
the expansion
pipe, no pipe
shall be bent.
Nitrogen vessel
Nitrogen vessel
Nitrogen vessel
Circulation pump
1M or higher
Outlet of hot
water
Direct connection to
tap water line
Circulation pump
Check valve Hot
water
tank
(If the water pressure is excessively high,
use the reduction valve.)
Circulation
preventing
pipe
Expansion pipe
20A or higher
Central Heating
Return
Discharge valve
Circulation tank
19
KRP-20A
10,000~20,000
10,000~20,000
1,256 x 828 x 1,400
25 A
15 A
Ø150
300 ㎏
5.43 ㎏/h
66 ~ 99 ㎡
AC 230V / 50Hz
·
kcal/h
kcal/h
Specification for wood pellet boiler
※The specifications are subject to
change for improving performance of
the product.
※The specifications may vary dependent
upon installation environment, ambient
conditions and climate.
※Never install the boiler for heating area
greater than 99㎡.
Model
Item
Max. CH
output
Hot water
output
Heat exchanger
structure
Air control mode
Operating power
Safety functions
Overheat shutdown function, low level function, flame
extinguishing function, counter-flow flame prevention function,
latent heat elevation prevention, duel frozen rupture prevention
Dimensions
(W x L x H)
Fuel size
(W x L x T)
Mode
Heating Inlet/Outlet
Ignition
Inlet and outlet of
heating(hot water)
Hopper capacity
Heating pressure
Hourly consumption
Hopper capacity
Ash generation
Heating area
STANDING TYPE 1 PASS
Forced fan (blower type)
Pellet (for Ø6)
Hot Water & Heating
Electric coil heater
3.5 bar or lower
Less than 1% (complete combustion)
The pipe shall be installed in such a way that
the boiler operates at pressure lower than 1
kg/m2 when installing the pipes in closed
type(1 bar)
(The boiler may be damaged due to abnormal
pressure resulted from solid fuel.)
Warning! The safety valve shall be
checked every six months without failure
2

01
▶
20
02
03
▶
Troubleshooting
Trouble: No normal ignition
Trouble: Disconnection of the feed motor and the electric heater
No Failure Troubleshooting Remarks
No Failure Troubleshooting Remarks
1. Fuel feed
screw failure
2. Fuel feed
motor failure
3. Insufficient
fuel
4. Foreign
material on screw
5. Photo sensor
failure
6. Defective fuel
1. Heater
disconnected
2. Fuel feed
motor
disconnected
①Check if the feed motor operates, though,
the fuel is not supplied.
②Remove and check the feed motor.
③Replace the screw.
①Check whether the controller is supplying
power (220 VAC) and the motor is operating.
②Replace the fuel feed motor.
①Check whether the fuel in the fuel storage
tank is insufficient.
②Fill the tank with fuel to the fuel feed line.
①Foreign materials are caught on the fuel feed screw,
so the screw does not operate.
②Remove any foreign materials (gloves, barks, and parts
of the gunny bag).
①Check the photo sensor for any defects (at a
voltage lower than 2.5 VDC).
①Remove fuel that has been exposed to
moisture and has congealed.
See photo 1
See photo 2
See photo 3
See photo 4
See photo 5
See photo 6
①Check the wire of the heater for damage.
②Replace the heater.
③The standard resistance on both ends of
the heater is 90~100Ω
①Check the wiring for damage.
②Replace the fuel feed motor.
③Check the limit sensor to see whether any
foreign materials have been caught in it
(e.g., gloves, parts of the gunny bag, and bark).
See photo 7
21
Troubleshooting
<Photo 1> <Photo 2>
<Photo 3> <Photo 4>
<Photo 5> <Photo 6> <Photo 7>

22
04
05
▶
08
06
07
▶
Troubleshooting
Trouble: Disconnection of temperature sensor and overheat sensor
No Failure Troubleshooting Remarks
No Failure Troubleshooting Remarks
Trouble: Defective transmission/reception
1. Water temp.
sensor
disconnected
2. Overheat
sensor
disconnected
1. Blower RPM
not detected
2. Low limit,
High limit
3. Defective
transmission/
reception
①Check the water temperature sensor for
correct connection.
②Check the wiring for damage.
③Replace the temperature sensor.
①Check the overheat sensor for correct
connection.
②Check the wiring for damage.
③Replace the temperature sensor.
①Check the wiring of the blower for
damage.
②Replace the blower.
①The RPM of the blower is too low or too high due to foreign
materials caught on the blower housing
②Too high RPM of the blower or the exhaust may be caused by
strong wind when the flue is installed in the wind pressure zone
Contact the installation shop about changing the location of the
flue.
③Remove condensate from the curved part of the flue, if any.
④Contact your distributor or the after-sales service center.
①Defective transmission/reception of the room controller and
the main controller: Ignition travel turned off
②If the problem persists for more than ten minutes, Error 08
has occurred, and the power LED blinks.
③Replace the room controller (automatic recovery).
Disassembled
part of burner
23
98
▶
96
▶
Troubleshooting
Trouble: Overheat error
Trouble: Triggering of the overheat sensor (bimetal) due to
counter-flow of flame
No Failure Troubleshooting Remarks
No Failure Troubleshooting Remarks
1) Symptom: Detecting water temperature higher than 93℃by the water temperature sensor/detecting
temperature higher than 92℃by the overheat sensor
2) Recovery: Automatic recovery upon water temperature lower than 88℃/overheat lower than 87℃
1) Step 1: Temperature at the water temperature sensor lower than 10℃- Released when the circulation
pump operates at temperature higher than 12℃
2) Step 2: Temperature at the water temperature sensor lower than 7℃- The circulation pump and the burner
start operation.
1. The circulation
pump
inoperable
2. The CH valve kept
lock to cause rapid
elevation of temp
erature
3. Controller
failure
Installing
detachable
pump
Installing the
boiler in the
boiler room
①Check the circulation pump circuit of the coil.
The measurement result for a resistance of ‘0’
indicates normal operation; ‘infinite’ indicates a
circuit of the coil. Replace the circulation pump.
①Check whether the distributor valve is locked;
if it is, open the locked valve.
①The feed motor continues operating even
when the fuel feed is in the halting mode.
②Replace the controller.
1. Fuel clogged
2. No Tee installed
on the flue causing
head wind
3. Fire tube
clogged
4. Poor air-tightness
of the fuel feed line
①Clean the flue.
①Install a Tee on the flue to prevent head wind.
①Clean the fire tube of the boiler.
①Poor air-tightness of the hoses and the pipes used
for feeding the fuel to the burner causes overheat
ing. Disassemble the band, check the air-tightness,
and reassemble the band.

24
Commissioning
①Fill the hopper with fuel.
②Turn the power of the auxiliary controller off with the main power kept on, and then press the
[ ON/OFF] button for 5 seconds.
③Check if the LED is lit, and if the fuel feed motor operates normally.
④After operating the boiler for one to two minutes, make sure that the pellets are fed through the
feeding hose.
⑤After making sure that the pellets are being fed into the burner, press the [Power] button to stop
manual fuel feeding.
⑥Press the [Power] button again to operate the boiler.
25
Commissioning
[NO.1] [NO.2]
[NO.3] [NO.4]
[No. 5 & 6]
HOT-4000N

26
Memo
27
Memo

30
Memo