Navien KDB-203 STC User manual

Read the instructions fully before installing or using the appliance.
CONSUMER, retain this manual for future reference purposes.
illustrations, functional steps and technical data without prior notice.
All product images are provided by the manufacturer and are for reference purposes only.
KDB-203/253/353 STC

Contents
The structure and its description
How to install
Before operating the boiler
How to use
Safety device
Routine checks and maintenance
How to replace the parts
Electric wiring diagram
Trouble shooting
Specifications
4
12
14
16
19
20
23
24
26
27

The structure and its description
4
The Structure of the boiler
Operation and display panel
POWER : displays the status of power on /o
COMBUSTION : displays the status of the burner combustion.
PUMP : displays the operating status of the circulation pump.
HOT WATER : displays the operating status of heating water.
LOW LEVEL : displays the status of water shortage, supply water
and drain o air.
OVERHEAT : displays the status of the tube overheated, press the
reset button and set the thermostat low. Even then, the same
status happens again, and contact our sales agency, commercial
agency .
SENSOR : displays the connection status of malfunction of the
sensor which senses the temperature of the tube.
MISFIRE : press the reset button on the panel. Even then the
same status repeats again, and contact our sales agency.
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Model : KDB-203STC
Η 3&4&5#6550/
Θ 108&3#6550/
Ι 300.5)&3.045"5
Ρ "*3'-08$0/530-
Κ *(/*5*0/53"/4'03.&3
Λ '-".&%&5&$503DET
$*3$6-"5*0/16.1
Ο
"6507"-7& ΢
&-&$530/*$16.1 Ν
&9)"645*/(7"-7& Μ
&91"/4*0/5"/, Π
0*-'*-5&3 Ξ
KDC-104CE
KDC-104P(E)
* KDC-104P(E): DHW Priority Model

5
The Structure of the boiler
Operation and display panel
POWER : displays the status of power on /o
COMBUSTION : displays the status of the burner combustion.
PUMP : displays the operating status of the circulation pump.
HOT WATER : displays the operating status of heating water.
LOW LEVEL : displays the status of water shortage, supply water
and drain o air.
OVERHEAT : displays the status of the tube overheated, press the
reset button and set the thermostat low. Even then, the same
status happens again, and contact our sales agency, commercial
agency .
SENSOR : displays the connection status of malfunction of the
sensor which senses the temperature of the tube.
MISFIRE : press the reset button on the panel. Even then the
same status repeats again, and contact our sales agency.
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Ŗ
Model : KDB-253STC
Η 3&4&5#6550/
Θ 108&3#6550/
Ι 300.5)&3.045"5
Ρ "*3'-08$0/530-
Κ *(/*5*0/53"/4'03.&3
Λ '-".&%&5&$503DET
$*3$6-"5*0/16.1
Ο
"6507"-7& ΢
&-&$530/*$16.1 Ν
&9)"645*/(7"-7& Μ
&91"/4*0/5"/, Π
0*-'*-5&3 Ξ
KDC-104CE
KDC-104P(E)
* KDC-104P(E): DHW Priority Model

6
The Structure of the boiler
Operation and display panel
POWER : displays the status of power on /o
COMBUSTION : displays the status of the burner combustion.
PUMP : displays the operating status of the circulation pump.
HOT WATER : displays the operating status of heating water.
LOW LEVEL : displays the status of water shortage, supply water
and drain o air.
OVERHEAT : displays the status of the tube overheated, press the
reset button and set the thermostat low. Even then, the same
status happens again, and contact our sales agency, commercial
agency .
SENSOR : displays the connection status of malfunction of the
sensor which senses the temperature of the tube.
MISFIRE : press the reset button on the panel. Even then the
same status repeats again, and contact our sales agency.
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Ŗ
Ŗ
Ŗ
Ŗ
Ŗ
Ŗ
Ŗ
Model : KDB-353STC
Η 3&4&5#6550/
Θ 108&3#6550/
Ι 300.5)&3.045"5
Ρ "*3'-08$0/530-
Κ *(/*5*0/53"/4'03.&3
Λ '-".&%&5&$503DET
$*3$6-"5*0/16.1
Ο
"6507"-7& ΢
&-&$530/*$16.1 Ν
&9)"645*/(7"-7& Μ
&91"/4*0/5"/, Π
0*-'*-5&3 Ξ
KDC-104CE
KDC-104P(E)
* KDC-104P(E): DHW Priority Model

7
The Structure of the boiler
The descriptions of the name
RESET BUTTON : a switch for the restart when the “MISFIRE ”, “OVERHEAT” lamp is on
POWER BUTTON : a device for the boiler’s power on/o
ROOM THERMOSTAT : a device for controlling the temperature of the heating water.
IGNITION TRANSFORMER : a high voltage generator(to ignite the burner)
FLAME DETECTOR : a device for identifying whether or not there is a ame in the re box.
EXHAUSTING VALVE : a device for removing air in fuel.
ELECTRONIC PUMP : a device for spraying fuel.
OIL FILTER : a device for ltering impurities in fuel.
CIRCULATION PUMP : a heating apparatus which circulates warm water.
EXPANSION TANK : Absorbs pressure generated in the pipe by the expansion of heating water
due to increasing temperature of heating water.
Maintain the water volume in the boiler at a constant by low water level sensor.
AIR FLOW CONTROL : for the adjusting of airow in the blower.
AUTO VALVE : This spare valve is to supply water manually when the auto water lling valve is
disabled.
Model : KDB-203/253/353 STC
Η
Θ
Ι
Κ
Λ
Μ
Ν
Ξ
Ο
Π
Ρ
΢
Η 3&4&5#6550/
Θ 108&3#6550/
Ι 300.5)&3.045"5
Ρ "*3'-08$0/530-
Κ *(/*5*0/53"/4'03.&3
Λ '-".&%&5&$503DET
$*3$6-"5*0/16.1
Ο
"6507"-7& ΢
&-&$530/*$16.1 Ν
&9)"645*/(7"-7& Μ
&91"/4*0/5"/, Π
0*-'*-5&3 Ξ

8
User’s Manual for Room Thermostat(DR-2ND, DR-2NDP)
Before Usage
Thank you very much for purchase this room thermostat(tele-room controller)
You had better fully read this user's manual.
It can give you more convenient and warm life.
Contents
Check point for safety
Check point for xing.
Check point for usage.
Fixing & Wiring.
Description & Function.
Check point for safety
1. Check the electric voltage before you operate the boiler.
2. Tele-room controller can be adapted to voltage DC 24~31V from the main controller of boiler.
Do not adapt to another electric outlet AC 220V or other.
3. Make sure to connect the electric port properly. One is for room controller, the other is for telephone.
Check point for fixing
1. Fix the room controller on the wall of main room or living room. The height is about 1.5m.
2. Fix on the properly spot to sense the room temperature.
3. Avoid to x near the heater or under the sun light, this can cause the torsion of the case and do a harm to
the electric parts inside the case.
4. Avoid to x in the place there is dirty, fumy, humid, this can do a harm to the electric parts inside the
case.
Check point for usage
1. You had better take care to prevent the metallic parts (Needle, Coin) or in ammables (Paper, Match stick)
from entering into the air vent hole of the case. This can make a short-circuit or re.
2. Do not open the case, and treat yourself.
3. Be careful the power line not to exposed in the room.
4. Keep out form the volatiles. (Thinner, Benzine, Solvent, ...)
5. Before you clean the room controller, plug the power cord out and use a smooth cloth.

1. Connect rmly the room controller wire (2 Line) from the boiler, to the room controller port in the back
of the room controller.
2. Connect rmly the telephone wire to the telephone port in the back side of the room controller.
3. Fix the room controller rmly on the wall, using the room controller bracket or socket.
4. Wiring
9
Fixing & Wiring
To the socket on wallOn the wall
controller
telephone

10
1. Continuous : Press this button to heat the room quickly.
ōPress the continuous button(Ξ), lamp(Ι) will on.
2. Outgoing : Boiler will stop and the frozen-up preventer will operate.
ōPress the outgoing button(Ν), outgoing lamp(Κ) will on.
3. Hot water : You can use hot water without heating room.
ōPress the hot water button(Μ), hot water lamp(Λ) and run lamp(Η) will on.
(Run lamp will not on at the wall-hung type gas boiler)
4. Temperature control : You can set the room temperature with temperature controller(΢).
(10°C~40°C)
ōPress the temperature button(Τ), lamp(Σ) will on. When the setting temperature you chose is
higher than the present room temperature, the boiler will run.
5. Time control : You can run the boiler according to the interval you set with the timer.
ĶIf you set the time interval. Ĵ
“0” : The boiler will run continuously.
“1” : The boiler will run 15min., then stop for 60min.(60min. interval)
“2” : The boiler will run 15min., then stop for 120min.(120min. interval)
“3” : The boiler will run 15min., then stop for 180min.(180min. interval)
“4” : The boiler will run 15min., then stop for 240min.(240min. interval)
ōPress the timer button(Π), the lamp(Ο) will on. The boiler will run for 15min, with the interval you
chose(60min. ~ 240min.), again and again.
6. Run lamp : Lamp is on then the boiler will run.
7. Check lamp : Indicate the trouble of boiler.(Misre, Low water level, Overheat, ... )
Room Controller Model : KDB-203/253/353 STC
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Ι$POUJOVPVT-BNQ
Κ0VUHPJOHMBNQ
Λ)PUXBUFSMBNQ
Μ)PUXBUFSCVUUPO
Ν0VUHPJOHNPEFCVUUPO
Ξ$POUJOVPTCVUUPO
Ο5JNFSMBNQ
Π5JNFSCVUUPO
Ρ5JNFDPOUSPMMFS
5FNQFSBUVSFDPOUSPMMFS΢
5FNQFSBUVSFCVUUPOΤ
5FNQFSBUVSFMBNQΣ
3VOMBNQΗ
$IFDLMBNQΘ

11
8. Usage of telephone
If you run the boiler with telephone, the boiler will run for 30min. then remain in outgoing function and
out of run lamp automatically.
You can control the working & stopping of boiler and timing of bell when you use interphone(inside) and
telephone(telephone and cellular phone).
- If you use telephone (telephone and cellular phone), the bell ringing (controlled timing of bell) then
sound beep. After sound beep you can control as following below ;
- If you use interphone (inside), you just pick phone up then you can control as following below ;
1) Turn on [# button 3times]
Call to your home, press theÖ# button×3times after beep sound. After beep, beep(2 Times) sound,
hang up the phone.
2) Turn o [* button 3times]
Call to your home, press theÖ* button×3times after beep sound. After beep, beep, beep(3 times)
sound, hang up the phone.
3) To change the timing of ring [0 button 3times]
Call to your home, press theÖ0 button×3times after beep sound. After beep, beep, beep, beep
(4 times) sound, press the timing of ring (5, 6, 7, 8, 9) you want 5 times, after beep, beep, beep, beep,
beep(5times) sound, hang up the phone.
4) Check point
4-1) If you don't press any button for 15sec. after pressing # or *, the telephone is hung up automatically.
4-2) Make sure that hang up the phone after the beep sound.(Turn on : 2times , Turn o : 3times)
4-3) Use Portable-phone at the clean zone.
4-4) When the beep sound does not sound, try again slowly.

How to install
12
Choosing of the installation place
The diagram of the standard piping :
Expansion tank install type
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For the placeto install the boiler, choose the placepossibleto do the accompanying works, such
as water supplyworks or electric works.
For the placeto install,choose the placeconformed to the installation standards of the boiler
and the construction actor the code of eachcity or municipality.
Install the boiler in the placeas wide as possiblefor the maintenanceand the re prevention.
Install the boiler in the placeconvenient for controlling and manipulation of the temperature.
If there is no electric outlet in the proper position, do wiring by requesting to acompany
designated by the electric power company.
Around the installation place, there must be no placewhichstores and treats the combustibles
and the inammables.
There shouldbe equiped drainage in the installing spot.
Model :KDB-203/253/353 STC
N0te: Install suchthat the distancebetween the water level of the eapansion tank and the oor of the boiler may be within 35m.
Return Water Distributor
Heat Radiator
Hot Water Distirbutor
Air Vent
Pressuer Gauge
Circulation Pump
Auto Valve
Expansion Tank
Pressure Relief Valve
ColdWater
Water Suppy
Fiter

13
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When the length of the ue ductis less than 2m, use the ue ductof φ75mm in diameter.
When the length of the ue ductis between 2m and 5m, use the ue ductof φ100mm in diameter.
When the length of the ue ductis longer than 5m, use the ue ductof φ125mm in diameter.
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Checkout that the oor is robust and at inammables suchas concrete and the circumferenceis
also made of inammables.
Checkout whether rainwater inltrates into the perforation of the exhaust/inhalepipes.
Checkout whether the boiler is connected to the ground.
Checkout that the boiler and the pipes is in the good heat insulation in order to prevent freezing.
The example of astandard installation
When extending the aluminum flue duct
Checking points after installation
Front View
Wall Inflammable material side Inflammable material
Exhaust
inhale pipe
Exhaust /
inhale pipe
30cm or more
60cm or more
Ň
Ň
B
O
I
L
E
R
F
insulation
nonflammable
E
F
DC
A
B
Ground
Over 20cm
Ground View

Before operating the boiler
14
It is essential to use onlykerosen or light oil.
(Don’t use gasoline, alchohol)
Store in the placewhere there is no eectof
oil,re, rain, and keep out of the sun.
It is better to use kerosene when the
temperature goes down below –5˚C
In winter, don’t use the light-oil for summer.
Feed oil after turning the power o and
locking the tank valve.
Pay attention that water or dust may not get
in on time of feeding oil.(Water or dust may
cause the combustion failure or shorten the
boiler span.)
Wipe o the oil spilled.
Close the lid of the oil inlet without fail.
Fuel

15
Checkout if or not oil leaks in the connecting
part of the oil pipe.
Checkout whether the ignition and the
combustion is normal.
(Checking through the ame inspection
window)
When the boiler is going to be not in use for a
long time, cut o the power.
(Don’t pull out the power cord when there is a
danger of freezing)
If you pull out the power cord on time of
thunder and lightening, you can prevent the
damage on the boiler by the falling of the
thunderbolts.
Be careful not to get burned due to the high
temperature of the exhaust/inhale
pipe(exhaust pipe).
In case of emergencysuchas you may feel the
abnormality of the boiler. cut o the power.
Don’t use the hot water for food.
Checking points before starting up
Put the surroundings of the boiler in order
and don’t put the ammables near the boiler.
Checking points before starting up

How to use
16
How to exhaust
Be careful that the oil tank may not run out of
oil completely.
In that case, even though oil is supplied, air
may get in. As aresult, ignition failure or
operation failure may occurs.
If the oil tank is below the oil lter or the air
ows out enough like the above, lockthe
screw for exhaust and remove the air with the
exhaust valve.
In suchcase, open the exhaust valve turn the
power on to operate the boiler. After about
6-7seconds, the electronic pump exhaust the
air o with noise, and “MISFIRE” lamp on, the
boiler stops.
Untighten the screw for exhaust in the oil
lter by ascrewdriver, the air goes out. When
oil ows out, please tighten it
(This is possibleonlyin case that the oil tank is
above the oil lter)

17
Now press the reset button on the panel
repeatedly, and the oil ows out.
Lockthe valve and press the reset button
again, and the boiler gets ignited.
In case that after removing air completely, the
ignition has failed repeatedlyabout ve times,
contactthe sales agencyor the commercial
agency.
Plug the power cord in the outlet.(Checking if
the outlet power is 220V)
Press the power button, and checkout if
“COMBUSTION” lamp turns on alittlelater.
Checkout that the boiler is grounded to earth.
(Don’t ground to the gas pipe or alightening
conductor)
Preparation and checking before
starting operate

18
Now press the reset button on the panel
repeatedly, and the oil ows out.
Lockthe valve and press the reset button
again, and the boiler gets ignited.
In case that after removing air completely,
the ignition has failed repeatedlyabout ve
times, contactthe sales agencyor the
commercial agency.
If ignition failsand the operation stops,
“MISFIRE” lamp turns on. In this case, press the
reset button on the panel.
In case that the ignition failswith pressing the
reset button four or ve times, contactthe
sales agencyor the commercial agency.
Pressing the power button starts fan motor.
And the boiler gets started, or turning the
“COMBUSTION” lamp on.
How to use

Safety device
19
When it doesn'tignite even with the power
button “ON” or it gets extinguished due to
running out of oil,the FLAME Detector(Cds)
gets to work and stops the operation.
Combustion safety device
If water is insucient in the boiler, it
interrupts the operation of the boiler with the
power cut o.
When water rells, the boiler starts operating
again automatically.
Low water level blocking device
If the temperature of the boiler rises up too
high, it is dangerous. So, in suchcase, this
devicecut o the power automatically.
When the overheating preventer gets to
operated the combustion stops and “OVER-
HEATING, MISFIRE” lamp turns on.
If the overheated temperature is fall “OVER-
HEATING” lamp turns o and “MISFIRE” lamp
keep turning on.
If the overheating stops operating, restarts it
by pressing the “RESET”button, If the
operation stop is repeated again, contactthe
sales agencyor the commercial agency.
Overheating preventer
During the hard winter, the circulation pump
or the burner operates automaticallyto
prevent the heating circuit from freezing.
In winter, keep on plugging in the power cord
and turning the power button “ON”.(the
insulation state of the pipes must be normal)
Freezing preventer
If the power gets o, oil gets blocked
automaticallyand the combustion stops.
Safety device on power-failure

Routine checksand maintenance.
20
Checkout whether the ammables are near.
Checkout whether oil leaks from, is stacked
on, or soaks into the oil tank, oil pipes, the
body of the boiler, etc.
Checkout whether there is any water leakage
from the body of the boiler and the pipes.
Open the drain plug of the oil tank regularly
and remove water.
Points to be checked once or
more year
Keep cleaning all the time and don’t let the
dust accumulated.