HARVIA WP500 50L Wood Burning Sauna Stove Instruction Manual

: June 13, 2024
: HARVIA

Table of Contents

HARVIA CAULDRON 50 L
INSTRUCTIONS FOR USE
INSTRUCTIONS FOR INSTALLATION
SPARE PARTS
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Cauldron-6ax
50 L
Instructions for Installation and Use

Congratulations on your choice! The Harvia cauldron works best and serves you longest when it is used and maintained according to these instructions.
Read the instructions carefully before installing or using the cauldron. Keep the instructions for future reference.

HARVIA CAULDRON 50 L

1.1 Technical Data

| Cauldron 50 I
---|---
Volume| 50 I
Required temperature class of chimney| T600
Weight| 36 kg
Width| 435 mm
Depth| 500 mm
Height +adjustable legs| 770 mm 0-30 mm
Diameter of connection opening| 115 mm
Maximum length of firewood| 39 cm

1. 2. Cauldron parts
A. Lid
B. Inner cauldron
C. Fire chamber
D. Door
E. Ash box
F. Connection opening

Figure 1. Cauldron parts

1.3. Burning
Thanks to the construction of the fire chamber, burning takes place slowly and the heat is directed under the inner cauldron, which results in quick heating of water. The replaceable fire chamber extends the cauldron’s life span.

INSTRUCTIONS FOR USE

Read the instructions carefully before using the cauldron.
2. 1. Warnings

Be careful with the cauldron when it is hot.
The surface of the cauldron may burn your skin.
Keep children away from the cauldron.
Watch out for the hot water. Hot water and hot steam will cause burns if they come in contact with your skin.
Avoid boiling water in the cauldron. Boiling water may splash from under the lid and cause burns to people near the cauldron.
Warn children about the dangers of hot water and tell them not to handle hot water.
Sea air and a humid climate may corrode the metal surfaces of the cauldron.
Do not use the cauldron without the fire chamber.

2.2. Preparing the Cauldron for Use Clean the inner cauldron carefully prior to use (2.7.).
2.3. Burning Material Dry wood is the best material for heating the cauldron. Dry chopped firewood clinks when it is knocked together with another piece. You can start the fire with birch bark or newspapers.
Do not burn the following materials in the cauldron:

Burning materials that have a high thermal value (such as chipboard, plastic, coal, brickets, pellets)
Painted or impregnated wood
Waste (such as PVC plastic, textiles, leather, rubber, disposable diapers)
Garden waste (such as grass, leaves)

2.6. Water
The water used in the cauldron should meet the quality requirements of clean household water. Make sure the water is of high enough quality, because water containing salt, lime, iron or humus may prematurely corrode the cauldron. You can also use lake water of good quality in the water container. It will not damage the cauldron materials as long as you clean the inner cauldron thoroughly

Water quality requirements:

humus content < 1 2 mg/litre
iron content < 0.2 mg/litre
calcium content < 100 mg/litre
manganese content < 0.05 mg/litre

2. 5. Heating the Cauldron
Before heating the cauldron make sure that LU there are no unnecessary items in the sauna or inside the cauldron’s safety distances.

When the cauldron is hot, keep the inner cauldron always as full of water as possible.
The inner cauldron will be damaged if it is empty or drained when the cauldron is hot.
Keep the inner cauldron clean. The inner cauldron is made of stainless steel, but foreign substances (iron, for example) may cause rust spots. (2.7.)
Cauldrons do not draw air as well as wood burning stoves due to the narrow and initially cold smoke duct between inner cauldron and outer casing.

Figure 3. Heating the cauldron

Empty the ash box.
Fill up the water container. The cauldron must never be heated when empty. Rather than fill the cauldron to the brim, leave it a few centimeters short of full to avoid overboiling.
Place the firewood into the fire chamber, leaving enough room for the combustion air to flow between the firewood. A few pieces of wood will be enough for heating the water -a full load will heat it boiling hot. (2.1.).
Place the kindling on the top of the firewood.
By starting the fire on the top of the firewood, fewer emissions are produced.
Fire the kindling and close the door. The amount of draught can be adjusted by opening the ash box. Burning should take place slowly.
The fire can be made very small.
If the chimney has a damper plate, it should be closed after the fire has finished burning. This helps to keep the water warm longer.

2.6. Maintenance

The ash box should be emptied regularly so that the combustion air that is lead through the box would cool off the fire grate and lengthen its life span. Get a metal container, preferably standing model, to put the ash in. As the removed ash may include hot embers, do not keep the ash container close to combustible material.
Empty the inner cauldron if the cauldron is not used for a long time or if the water may freeze. Expanding ice may break the inner cauldron.
The inner cauldron can be removed for cleaning and chimney sweeping. If the outer surface of the inner cauldron is covered with a thick layer of soot, water will heat up more slowly and the consumption of firewood will increase.
Wipe dust and dirt from the cauldron with a damp cloth. Remove lime stains using a 10 % citric acid solution and rinse. Do not use strong cleaning chemicals.
If for some reason rust spots appear on the inner cauldron, remove them with 400-grit or rougher water sandpaper. Clean the inner cauldron carefully after sanding. Do not use steel wool to remove rust spots.
The chimney should be swept at regular intervals to ensure sufficient draught.

2.7. Troubleshooting
There is no draught in the flue. Smoke comes into the sauna.

There are leaks in the flue connection. Seal the connection (3.2.2.).
The brick flue is cold.
There is low pressure caused by an extractor fan or another device in the room. Make sure there is enough air to compensate.
Several fireplaces are used at the same time.
Make sure there is enough air to compensate.
The ash box is full.
The flue connection pipe is too deep in the chimney (3.2.2.).
Water drips from under the cauldron.
When the inner cauldron is filled with cold water, some of the water may condense on the cauldron’s outer surface, which may arouse suspicion of a possible leak in the cauldron.
This is, however, a natural phenomenon and will disappear as the water warms up.
The heating efficiency of the cauldron has weakened.
Clean the outer surface of the inner cauldron (e2.6.).

INSTRUCTIONS FOR INSTALLATION

3. 1. Before Installation
Before installing the cauldron make sure that all safety distance requirements are fulfilled.
There shall be no electrical devices, wires or inflammable materials within the established safety distances around the cauldron.

The local fire authorities in charge of approving the installations can provide more detailed information about fire safety regulations.

3.1.1 Protecting the Floor
See figure 4. A tile floor or floor made of inflammable material must be protected with the Harvia protective bedding (WX018) or similar heat radiation protection.
On a floor made of inflammable material also a spark protection is needed (see figure 4 for dimensions).

Figure 4. Protecting the floor (all dimensions in millimeters)

3.1.2. Safety Distances
See figure 5.
A. Ceiling. For safe use, leave at least 1000 mm between the cauldron and the ceiling.
B. Masonry walls. Leave 50 mm between the cauldron and walls, provided that the air can circulate in front and to one side of the cauldron. If the cauldron is installed in a recessed wall, leave 100 mm between the cauldron and walls for the air circulation.

Figure 5. Safety distances (all dimensions in millimeters)

C. Walls and benches made of inflammable materials. 250 mm on either side and 1000 mm in the front.
D. Space required for use and maintenance. The cauldron user needs at least one square metre of space in front of the cauldron.
3.1.3. Cauldron and wood-burning stove side-by side
If a wood-burning stove is placed closer than 250 mm from the cauldron, the stove and cauldron must be separated by a non-flammable protective sheath. The purpose of the sheath is to protect the cauldron from direct heat radiation from the stove. When equipped with a sheath, the stove and cauldron can be located as close ad 60 mm from each another.

Figure 6. Cauldron and wood-burning stove side-by-side (all dimensions in millimeters)

3. 2. Installing the Cauldron
3. 2. 1 . Adjustable Legs
The adjustable legs enable the cauldron to be installed firmly on an inclined floor. The adjustable range is 0-30 mm. Unscrew the adjustable feet to an extent that allows them to be adjusted using a wrench ( 17 mm) when the cauldron is in position.
Note! The adjustable feet could scratch the floor surface if the cauldron is moved on the floor.
3.2.2. Connecting the Cauldron to a Masonry Flue

Make an opening in the fireproof wall for the flue connection. Notice that the opening has to be at the correct height, if you intend to use, for instance, a protective bedding. The hole should be slightly larger than the flue connecting pipe. A suitable gap around the connection pipe is ca. 10 mm.
It is advisable to round off the inner corners of the flue opening to ensure that the combustion gases can flow freely to the flue.
Do not push the flue connection pipe too far into the flue. If necessary, shorten the pipe.
Seal the flue connection pipe to the opening in the fireproof wall, for example, by using fireproof mineral wool. Make sure that the flue connection is tightly sealed. Add more fireproof mineral wool if necessary.
See figure 7.

Figure 7. Connecting the cauldron to a masonry flue (all dimensions in millimeters)

3.3. Changing the Opening Direction of the Door
The door to the firing chamber can be installed to open either to the right or to the left. See figure 8.

Figure 8 Changing the opening direction of the door