Dantherm WA 20 Manual de usuario

Service manual Page 1

Wartungsanleitung Seite 13

WA 20/20M

WA 30/30M

Service manual

No. 970009 • rev. 1.1• 28.03.2008

Der tages forbehold for trykfejl og ændringer

Dantherm can accept no responsibility for possible errors and changes

Irrtümer und Änderungen vorbehalten

Dantherm n’assume aucune responsabilité pour erreurs et modifications éventuelles

CONTENTS

1. Function ................................................................................................................ 2

2. Technical data....................................................................................................... 3

3. Positioning and mounting...................................................................................... 4

3.1 Mounting of WA 20M.................................................................................... 4

3.2 Mounting of WA 20 and WA 30.................................................................... 4

3.3 Air supply and flue outlet connection for WA 20 and WA 30........................ 5

3.4 Duct connection............................................................................................ 6

3.5 Burner door .................................................................................................. 7

3.6 Electrical connection .................................................................................... 7

3.7 Burner connection ........................................................................................ 7

4. Starting.................................................................................................................. 8

4.1 Winter operation........................................................................................... 9

4.2 Summer operation........................................................................................ 9

4.3 Operation with fan speed control.................................................................. 9

5. Service and cleaning........................................................................................... 10

5.1 Filter ........................................................................................................... 10

5.2 Burner chamber and heat exchanger......................................................... 10

5.3 Further components ................................................................................... 11

6. Fault finding......................................................................................................... 12

7. Wiring diagrams .................................................................................................... ?

970009_Varme_WA 20-30_1.1_EN-TY_20080328

1. FUNCTION

Dantherm warm air heaters are indirect fired units for oil or gas firing. The heat produced by the

burner is transferred to the air which is passed over the burner chamber and heat exchanger by a

fan.

On WA 20/30 heaters the cold air is taken in at the bottom of the heater and the hot air is blown out

in the top.

On WA 20M the air flow direction is opposite, so that the cold air is taken in at the top of the unit

and the heated air is blown out at the bottom.

The operation of the unit is controlled as follows:

¾When the room thermostat has signalled to the unit to start, the burner runs with pre-purge

of the burner chamber. Shortly after the burner will ignite.

¾When the burner has been working for a few minutes the air in the heater will have reached

a temperature sufficiently high for the fan to start automatically. The purpose of this delayed

starting of the fan is to avoid blowing cold air into the room when the heater starts. From the

factory the fan is set to start at a temperature of 50°C.

¾When the room thermostat gives a signal to the heater to stop, the burner will stop but the

fan will continue to run. A few minutes later, when the temperature has dropped to about

30°C, the fan will also stop. The purpose of letting the fan run for a few minutes longer than

the burner is to cool down the burner chamber and heat exchanger slowly to avoid possible

damage by rapid contraction of the metal. After the fan has stopped it may happen that the

burner chamber and the heat exchanger are still so hot that the fan will start again a few

minutes later.

¾If a fault occurs in the unit the built-in safety thermostats will stop it immediately. The Limit-

thermostat will switch off the burner when the air temperature has reached 80°C. When the

temperature has dropped the burner will start automatically again. The fan is still running.

When the temperature in the unit exceeds 100°C the safety temperature limiter (OT) will be

activated and switch off the unit as well as the fan. It will now only be possible to start the

unit after a manual resetting.

970009_Varme_WA 20-30_1.1_EN-TY_20080328

2. TECHNICAL DATA

WA 20 WA 20M WA 30

Power supply V/Hz 1x230/50 1x230/50 1x230/50

Max. energy consumption kW 22,3 22,3 33,6

Max. heat output kW 20,1 20,4 30,3

Efficiency 90,3 91,6 90,2

Max. oil consumption1) kg/h 1,9 1,9 2,9

Max. gas consumption2) m³/h 1,9 1,9 2,9

Temperature rise (1200m³/h) Δt°C 20 20 22

Weight without burner kg 75 75 96

Flue outlet – internal diameter mm ∅140 ∅140 ∅140

Flue outlet – outside diameter mm ∅143 ∅143 ∅143

Flue gas resistance in comb. chamber during operation Pa 18 17 22

Flue gas volume m³ 0,032 0,032 0,038

Hot surfaces m² 1,5 1,5 2,2

Burner tube, length mm 105 105 105

Burner tube mm ∅120 ∅120 ∅120

1) Fuel oil EL according to DIN 51603

2) Calculated at max. calorific value Hs= 43,2 MJ/m³

WA 20 Free-

blowing 50 Pa

resistance 100 Pa

resistance 150 Pa

resistance

Air volume m³/h 1200 1090 1010 820

Max. power consumption kW 0,4 0,4 0,4 0,4

Max. ampere consumption A 2,3 2,3 2,3 2,3

Noise level @ 1 m dB(A) 65

WA 20M Free-

blowing 50 Pa

resistance 100 Pa

resistance 150 Pa

resistance

Air volume m³/h 1200 960 790 710

Max. power consumption kW 0,4 0,4 0,4 0,4

Max. ampere consumption A 2,3 2,3 2,3 2,3

Noise level @ 1 m dB(A) 64

WA 30 Free-

blowing 50 Pa

resistance 100 Pa

resistance 150 Pa

resistance

Air volume m³/h 2000 1720 1420 1280

Max. power consumption kW 0,55 0,55 0,55 0,55

Max. ampere consumption A 3,0 3,0 3,0 3,0

Noise level @ 1 m dB(A) 65

970009_Varme_WA 20-30_1.1_EN-TY_20080328

3. POSITIONING AND MOUNTING

When positioning the unit all legal requirements such as gas,

electric and building regulation must be observed.

When positioning the heater, all legal requirements regarding

inspection and cleaning must be observed.

There must be free access to the unit from all sides, so that all components can be inspected.

The space in which the unit is placed, must be sufficiently ventilated. Negative pressure in the

space must not occur, for instance as a result of the operation of the burner or the exhaust, as this

could result in oxygen deficiency at the burner, which might result in bad combustion or faults at

the burner. In such cases a separate fresh air intake for the burner or the room (wall louvre) will

have to be installed.

The position of the unit must be chosen in such a way that the heated air is not blown directly

against pillars, shelves, partition walls etc.

3.1 Mounting of WA 20M

WA 20M is designed only for duct connection and will therefore have to be mounted directly on the

supply air duct. The air intake duct is fitted at the top of the heater. The flue can only be connected

at the back of the heater.

3.2 Mounting of WA 20 and WA 30

On delivery the heater is placed horizontally on a wooden pallet. After removing the packing the

WA 20/30 heater is placed on either the supplied stand or directly on an air intake duct. If the unit

is to work without air intake duct the stand MUST be used, as the air is taken in at the bottom of

the unit.

If a fresh air supply is required, the heater must be placed on a special module (extra accessory).

The fresh air duct is connected to one of the four sides of the module – please refer to drawing and

dimensions below.

970009_Varme_WA 20-30_1.1_EN-TY_20080328

a b

WA 20 300 300

WA 30 500 500

3.3 Air supply and flue outlet connection for WA 20 og WA 30

Supply of heated air and connection of flue outlet can be carried out in one of the following ways:

¾Air supply (free-blowing) through module (accessory) and flue outlet connection at the

back of the heater

If flue outlet connection on the back has been ordered, the heater will be fitted with a pre-

mounted flue outlet piece. The air supply module is not fitted on delivery.

¾Air supply (free-blowing) through module (accessory) and flue outlet connection at the

top of the heater

If flue outlet connection on top has been ordered, the heater will be fitted with a pre-mounted

flue outlet piece. The air supply module is not fitted on delivery.

¾Air supply through duct and flue outlet connection at the back of the heater

If flue outlet connection on the back has been ordered, the heater will be fitted with a pre-

mounted flue outlet piece. Duct connection in accordance with the drawing below.

WA 20 360

WA 30 560

970009_Varme_WA 20-30_1.1_EN-TY_20080328

¾Air supply through duct and flue outlet connection at the top of the heater

If flue outlet connection at the top has been ordered, the heater will be fitted with a pre-

mounted flue outlet piece. Duct connection in accordance with the drawing below.

WA 20 360

WA 30 560

3.4 Duct Connection

If ducts for air intake and exhaust are to be fitted, please take care that the total pressure loss of

the entire duct system is not too large – please refer to section 2 Technical data. With high

pressure losses in the ducts the quantity of air will be reduced, so that the unit will become

The chimney must not rest on the heater. If it is necessary to support the chimney,

the support must be fixed to something else than the heater.

The chimney must be connected in accordance with national legal requirements.

Consult the local chimney sweeper.

Chimney connection for gas-fired heaters is to be made only by authorized

specialists.

If flue outlet connection at the top of the heaters has been chosen, the chimney has

to be insulated by non-inflammable material (mineral wool).

970009_Varme_WA 20-30_1.1_EN-TY_20080328

overheated and as a result of this switch off (see also paragraph 6, Fault finding). A too high

pressure loss will also reduce the efficiency of the unit.

3.5 Burner door

WA 20/30 standard versions are fitted with right-hand door. The door is changed to left-hand by

dismounting the hinges at the right, turn them 180° and mounting them again in the door fittings at

the left.

3.6 Electrical connection

Inside the control panel is a terminal strip on which all the connections of the unit are located. 1 x

230 V/50 Hz supply voltage is connected through the terminals L and N (network) and through the

earth terminal.

The room thermostat is connected through the terminals 8/9 (room thermostat). Use terminal 7(N)

if a room thermostat with accelerator is mounted The existing bridges are removed, as the burner

will otherwise run continuously. A thermostat for 1 x 230V or a week panel 1 x 230V is used.

The cables for power supply and room thermostats can be passed into the heater through the

holes at the top or the bottom. The holes have a covering which can easily be pierced. The cables

are passed into the control box by means of PG screw-joints.

If a fan speed control is installed it is connected on the terminal strip at the same position as the

burner through the terminals A/B. The existing bridge between the two terminals is removed.

3.7 Burner connection

Oil or gas supply pipes can be passed into the heater through the pre-bored holes at the top or at

the bottom of the heater in the same way as the electrical connection.

The burner is connected to mains by means of a Wieland plug. This plug is already pre-mounted in

the burner compartment. If the burner has no corresponding plug/does not fit to this plug, the

Wieland plug in the WA 20/30 unit should be disconnected and electrical connection is instead

made as shown in the wiring diagram and according to the wiring diagram of the burner.

Burner manufactures and burner types utilised must be affixed with the

CE marking. Gas burners must be in accordance with EN 676. Oil

burners must be in accordance with EN 267. It must be ensured that the

working area is correct for the heater in question.

Oil and gas connection is to be made only by authorized

specialists.

Before starting and adjustment of the burner, please refer to the instructions from the burner

supplier. If the heater is delivered with pre-mounted burner the instruction manual for the burner is

delivered separately with the WA heater.

970009_Varme_WA 20-30_1.1_EN-TY_20080328

4. STARTING

Important!

The warm air heater may only be switched off by means of the

room thermostat or the burner switch. Switching off the unit by

means of an external breaker might cause overheating and thus

damage to the burner chamber and

the heat exchanger.

If the temperature for some reason rises above 80°C inside the heater, the Limit thermostat will

stop the burner till the temperature has fallen below 80°C. If the temperature inside the heater rises

above 100°C the safety temperature limiter (OT) will switch off all voltage to the heater, so that

burner and fan are inactivated. When the heater has been cooled down it will not start again

automatically. Re-starting will follow by pressing the reset-button (1) on the safety temperature

limiter (OT) (see figure below).

WA M 20 has two OT thermostats with each their reset push-button (1) and (2) - (see figure

below). If one of the safety thermostats has switched off the unit, see paragraph 6 “Fault Finding”.

Reset push-buttons for safety temperature limiter (OT)

970009_Varme_WA 20-30_1.1_EN-TY_20080328

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