Bosch 11 KW Instruction Manual download pdf (Page 21)

REGULATIONS

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12 REGULATIONS

The following regulations and requirements must be observed:

• The responsible power supply company's local regulations and

requirements, including any corresponding special rules

• National building regulations

• EN 60335 (Electrical appliances and similar utilities - Safety)

part 1 (General demands)

part 2-40 (Special demands on electrical heat pumps, air

conditioners and air dehumidifiers)

• EN 12828 (Heating systems in buildings - Design and installation of

water-based heating systems)

13 INSTALLATION

13.1 COLLECTOR HOSE

The task of the collector hose is to convey the heat transfer fluid through

the ground to gain a few degrees of heat. The hose is a thin-walled plastic

hose of type PE80/PE100 quality, diameter 40 mm.

INSTALLATION AND BACKFILLING AROUND THE COLLECTOR HOSE

Installation of the collector and backfilling the soil around the collector

hose should follow applicable material and working descriptions and

regulations. It is important that the filling material does not contain

stones or other sharp objects that can damage the collector hose. Use

hose pliers, not a saw, when cutting the collector hose. Deburr the end

of the pipe internally and externally. It is important that no dirt or debris

enters the system. Dirt and debris can cause a blockage in the heat

pump.

MINIMUM PERMITTED BENDING RADIUS

Minimum permitted bend radius is 1 metre. If sharper bends are

required an elbow connector must be used. If the collector hose is dam-

aged by too sharp a bend, it can be repaired by using a straight coupling.

MAXIMUM LENGTH OF THE COLLECTOR HOSE

The maximum length of the collector hose is based on the heat transfer

fluid pressure drop. A heat transfer fluid consisting of propylene glycol

and water is recommended.

OUTLINE DRAWINGS FOR THE COLLECTOR HOSE IN THE GROUND

AND THROUGH A WALL

The drawings below show how to run the collector hose in the ground

and through a wall. The soil filling around the hose must not contain

stones.

Fig. 15 Collector in the ground

[1] Filling of sand or stone free soil approximately 100 mm around

the collector hose

[2] Collector PE80/PE100 ø40 mm

Fig. 16 Example of the collector through the wall

[1] House wall

[2] Collector hose

[3] Insulation

INSULATION OF PIPEWORK

All collector pipework should be insulated a minimum of 2 metres from

the property. Pipework should also be insulated where the flow and

return are closer than 800 mm to each other. Use Class O insulation, 19

mm thick.

CONNECTING THE COLLECTOR HOSE TO THE HEAT PUMP

It is important that the collector hose has been leak tested before it is

connected to the heat pump. The hose should be tested to 3-4 bar for a

minimum of 1 hour to ensure there are no leaks. The leak test can be per-

formed using an air compressor. The collector is usually pressurised dur-

ing the laying process.

The collector hose can be connected to the heat pump with one or more

circuits. In a multi-circuit system, the collector pipes are connected in

parallel as illustrated below. The parallel pipes are connected to two

manifolds. Each coil must have a shut off valve and a flow control valve.

The flow control valve is adjusted so that the flow rate is the same in each

coil. The coils should have the same length. If the length of the coils are

different, the control valves should be adjested so that each coil gets the

same flow. When adjusting the control valves, use the same difference in

percentage as the difference in the length of the coils.

Only competent persons may carry out the installation.

The installer must follow applicable rules and regulations

and recommendations from the supplier.

The maximum collector hose lengths for heat pump

models are provided in the table. In situations where the

length of the collector hose needs to exceed the

permitted value, you can connect the hoses parallel.

Heat

pump

model

Maximum length of collector

hose with a single circuit

(m) PE80/PE100 ø40 mm

Collector hose with 2 circuits in

parallel: Maximum length per

circuit (m) PE80/PE100 ø40 mm

6kW 600 -

7kW 500 1000

9kW 400 800

11kW 400 800

Table 17

Non-combustable pipe material must be used when

routing the pipes indoors.

800-1000 mm

200 mm

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