Manual Stovax View High Output Boiler Stoves (page 27 of 44) (English)

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Installation Instructions

3. Hot Water Cylinder

3.1 The domestic hot water cylinder must be an indirect vented

double feed type to meet national standards** and should have

a minimum capacity of 117 litres. Houses with more than one

bathroom or a separate shower will need a bigger tank.

Fully insulate the tank.

The water draw off pipes to the taps should be in a dead leg

connection from the vent pipe.

4. Open Vent & Cold Feed System

4.1 This system must be fitted with a minimum of 22mm diameter

open vent discharging into a heat resisting feed and expansion

tank. There must be at least 25mm air gap between the end of

the pipe and the water level. The cistern tank should have an

overflow with a minimum diameter of 22mm.

The cold feed must be a minimum 22mm and enter the

system as the last connection on the common boiler return.

The open vent and cold feed must not be fitted with any

valves, manual or automatic.

Do not use plastic pipe in any part of the flow and return.

5. Heat Leak Radiator

5.1 A heat leak radiator must be fitted in the gravity circuit to

dissipate any excess heat produced from the boiler when

connected demand is low. The domestic hot water cylinder

may not be able to disperse heat at all times due to modern

insulation. This radiator is commonly fitted in the bathroom

and should be rated at 2kW (6500 btu) or 10% of the total

boiler output.

This radiator ensures that the appliance is not shut down

completely for long periods resulting in the fire going out.

Fit the heat leak radiator in the gravity circuit using 22mm pipe

reducing to 15mm for no more than 300mm before the radiator.

 Fittheradiatorwithtwo‘lock-shield’valvesthatareset

in the fully open position and cannot be shut down. Use

diagonal connections. Do not fit thermostatic valves or

manually adjustable valves to the heat leak radiator.

6. Pump

6.1 Where a pump is fitted into the circuit it should be adjustable

so that the flow can match the system requirements. Fit

isolation valves to enable removal for servicing. The pump

must have at least 1.5 meters of static head.

7. Electrical Supply

7.1 Electrical connections must meet the requirements of

national Building Regulations† and standards‡, along with

any European, local regulations and working practices that

may apply. Should conflict occur between these instructions

and these regulations then the regulations must be followed.

The connection to the mains supply should allow

complete electrical isolation and only serve the heating

circuit pump.

All water connections should be completed by a competent

person to meet the requirements of local water authority

by-laws.

CONVENTIONAL PIPEWORK SYSTEMS

All pipe work must be able to operate at above 100

degrees Celsius. Any pipe work installed in an exposed

position e.g. loft space must have provision to prevent

freezing.

Ensure the pipe work system has sufficient drain

points to enable the complete removal of water for the

purposes of servicing.

8. Gravity Pump Circuit

8.1 To prevent the risk of boiling it is essential to arrange the

pipe work and position the hot water cylinder and heat leak

radiator so that gravity circulation can take place when the

pump is not running. Position the cylinder and the radiator

vertically above the boiler with sufficient height to encourage

gravity flow.

8.2 Horizontal pipe work in a gravity system must have an

incline of at least 5mm in every 1000mm and a minimum

diameter of 28mm. Vertical pipe must have a minimum

diameter of 22mm.

8.3 Any motorised valves fitted in this circuit must return to the

fully open position when the power is interrupted.

9. Pump Assisted Central Heating

9.1 The most common arrangement is to have a pumped central

heating circuit combined with a gravity hot water circuit. This

arrangement requires careful balancing of the two in order

to avoid the gravity circuit being starved when the pump is

running.

To overcome this problem it is common practice to fit an

injector tee where the pumped central heating return re-joins

the gravity return from the hot water cylinder. This injector

tee induces a much stronger gravity flow when the pump

runs.

Only use proprietary injector tees, homemade ones are

difficult to get right.

9.2 When installing a system that has pumped central heating

and gravity hot water it is recommended to use all 4

boiler tappings. Each flow and return should be diagonally

opposite each other.

In the Uk:

† England and Wales - Document (/ Scotland - Part N/

Building Regulations

‡ BS7671

* See BS 5449:1

** See BS 1566 Part 1 grade 3 minimum

Registered body: HETAS (GB only)/ INFO (Eire)

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Stovax View High Output Boiler Stoves Manual

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