• The Kayema thermosiphone system is unique as it uses only one Rand solar collector for each installation
• The R1 is specifically sized for 150 L of water and the R4 is sized for 200L
• The Kayema system is installed using a Duratherm standard indirect tank
• Brackets are supplied for installation on-roof or in-roof (see instructions)

WHAT IS A FLAT PLATE COLLECTOR AND HOW DOES IT WORK?

When the tank of a solar water heater is positioned above the source of the heat i.e. the collector, the water is heated and rises up to the tank where it is stored for later use. The Kayema system is an indirect system, this means that the water is heated by an internal heat exchanger which contains a propylene glycol. The reason for using glycol is for the prevention of freezing as well as the build-up of scale in hard water areas.

THE COLLECTOR

Kayema solar collectors are manufactured of noble materials, according to a proprietary design. Our collectors offer an unmatched level of efficiency and provide a significantly long life.
The copper piping is ultrasonically welded to the copper absorber plate, assuring more efficient and effective heat conductivity. Absorber plate coatings are available in sputter coating, black chrome selective coating or high efficiency solar paint.
The collector frame is made out of extruded Aluminium or Stainless steel. Our Aluminium frame is coated according to customer requirements with superdurable powder paint or P.V.D.F wet coating. The casing back plate is made out of P.V.C or Aluminium. Collector casing is insulated using either high density CFC & halogen free polyurethane casting protected by 100 microns Aluminium foil or by wool glass boards. The cover plate is made of tempered glass; standard glass is available.
Each Kayema collector undergoes 12 bars pressure testing.

Collector structure

1. Glass – tempered standard 2. Absorber plate coating – sputter, chrome, paint 3. Frame -aluminium / stainless steel 4. Copper risers – 3/8″ – 1/2″ diameter 5. cooper manifold – 7/8″ – 11/8″ diameter 6. Aluminium foil 7. Insulation – polyurethane / wool glass 8. Back plate – p.v.c/aluminium

ADVANTAGES OF THE KAYEMA SYSTEM

• Due to the climate in South Africa the flat plate collector is much more suited as, in summer the collector can reach very high stagnation temperatures and could damage the system as well as waste water for leaking T and P valves.
• The Kayema systems have proven to be a leading product in Israel and as the climate is very similar, South Africa will experience the same
• The aluminium casing also provides a tight seal on the collector and will achieve minimum heat loss in winter and no water penetration.
• Due to the use of one collector per system, installation is much simpler.

INSTALLATION OF KAYEMA SYSTEM

TOOLS & CONSUMABLES REQUIRED

SPANNER SIZE 10 & 13

SPIRIT LEVEL

EXTENTION LADDER

FALL ARREST SYSTEM (HARNESS)

RATCHET

PLUMBER’S PLIERS

PLUMBER’S TAPE

COPPER PIPE 22MM (3/4 INCH PIPE)

COPPER FITTINGS AS NECESSARY

PIPELINE CONNECTION – IMPORTANT POINTS

1. The thermosiphone system must be placed in a high position.  It must be positioned facing true North and be free of shadows. Allocate the position by facing the system towards the sun at 12 o’clock midday.
2. Make sure to allocate a position as close as possible to the nearest hot water outlet and away from any shadows.
3. The system is most efficient when positioned at an angle between 30? and 60?. Depending on the latitude of your area, e.g, Pretoria is situated 25? South, add 10? to the latitude and it will give you the optimum performance angle.
4. The standard bracket supplied with your system is ideal for pitched surface. You may need to adjust the length of the back support in order to get to your desired angle.
5. If the system is to be mounted onto a roof, make sure that it is adequate to support the system when it is filled with water.
6. Secure the frame first before mounting the tank.
7. Use PTFE thread seal tape when connecting the fittings.
8. Never fill the tank with water when it has been exposed to the sun while empty. Fill the tank 3 hours after sunset.
9. Do not leave the collector in the sun without water.

10.  It will take 6 hours of sun in order to reach the desired temperature

11.  If there is a possibility of dirt/sand/grit in the water it is imperative that an inline water filter be connected on the cold water line.