Pre-Installation
11
Bosch Condens 5000W – 6 720 646 195 (2018/10)
3 Pre-Installation
3.1 Cleaning primary systems
NOTE:
▶ All the following pre-installation sections must be read and
requirements met before starting boiler or flue installations.
CAUTION:
▶ Isolate the mains supplies before starting any work and observe all
relevant safety precautions.
System contamination and debris:
▶ Debris from the system can damage the boiler and reduce efficiency.
Failure to comply with the guidelines for the use of water treatment
with the boiler will invalidate the warranty.
Before cleaning the system:
▶ Ensure the system and pipe work are in good working order.
▶ Where possible keep the existing boiler/circulating pump in
place when flushing the system.
NOTICE:
▶ Artificially softened water must not be used to fill the CH system.
Flushing the system:
▶ Fill the system with cold water and check for leaks.
▶ Open all drain points and drain the system.
▶ Close drain points and add a suitable flushing agent compatible with
aluminium at the correct strength for the system conditions in
accordance with the manufacturer‘s instructions.
The pH value of the system water must be less than 8 or the boiler
guarantee will be invalidated.
▶ Circulate the flushing agent before the boiler is fired up.
▶ Run the boiler/system at normal operating temperature as directed
by the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris.
▶ It may be necessary to use a power flushing machine to aid the
cleansing procedure in some circumstances.
▶ Close the drain points and refill with fresh water and a suitable
inhibitor.
▶ Vent any air from the boiler and system.
Inhibitor
▶ Add a suitable inhibitor or combined inhibitor/antifreeze, if the
system is exposed to freezing conditions, to the heating system in
accordance with the manufacturer‘s guidelines.
WARNING:
Sealing agents:
▶ The addition of sealing agents to the system water is not permitted as
this may block the heat exchanger.
3.2 Mains supply
3.2.1 Electrical supply
• Supply: 240V - 50 Hz, 140 Watts.
• Cable: PVC insulated 0.75 mm2 (24 x 0.2 mm) temperature rated to
90 °C.
• External 3A fuse.
• The boiler must be earthed.
• This boiler must not be connected to a three phase supply.
• IPX4D.
• Wiring must comply with AS/NZS 3000 Electrical Installations.
3.2.2 Equipotential (earth) bonding
• Main equipotential bonding is carried at the origin of the electrical
installation.
• Supplementary bonding is carried out in an area of increased shock
risk e.g. bathrooms.
• Metal pipes can be used as bonding conductors if joints are metal to
metal and electrically continuous.
• Wiring regulations require that extraneous conductive parts must be
connected to the main electrical earth.
• The main bonding of incoming metallic services must be as close as
practical to their entry point, before any branch pipe work and a
maximum of 600mm from an internal meter.
• Earth bond conductors must be copper and the same size as other
earth bonding conductors and not be less than 10mm
2
.
• The earth bond conductors must be permanently fixed to the metal
pipes with clamps and labels in a visible position to allow for
inspection.
3.2.3 Gas supply
• Boilers using natural gas (NG) must be connected to a governed
meter.
• Liquefied petroleum gas (LPG) must be connected to a regulator or
governed meter.
• Installation and connection of the gas supply to the boiler must be in
accordance with AS/NZS 5601.
• Under no circumstance should the size of the gas supply pipe be less
than the inlet on the boiler.
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier. This is to ensure that the equipment is
in good working order and can meet the gas flow and pressure
requirements and demand from any other appliance being served.
3.3 Water system and pipe work
Plastic pipe work
• Any plastic pipe work must have a polymeric barrier with 600mm
(minimum) length of copper pipe connected to the boiler.
• Plastic pipe work used for underfloor heating must be correctly
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50 °C.
Primary system connections/valves
• All system connections, taps and mixing valves must be capable of
sustaining a pressure up to 3 bar.
• Bosch recommends that thermostatic radiator valves (TRV’s) be
used on all radiators within the sleeping accommodation but not the
radiator where the room thermostat is sited. This must be fitted with
lockshield valves and left open.
• A drain point is required at the lowest part of the system.
• An air vent is required at all the high points in the system.
The boiler is equipped with an automatic internal by-pass.
To Next Page
Loading...
