Buderus 600 - 11R Installation And Servicing Instructions page 6

NOTE:
notes relating to domestic hot water.
The boiler must not be used for direct hot
water supply.
The hot water storage cylinder must be of
the indirect type.
Primatic cylinders are not recommended
and must not be used on sealed systems.
The hot water cylinder and ancillary
pipework, not forming part of the useful
heating surface, should be lagged to
prevent heat loss and any possible
freezing - particularly where pipes run
through roof spaces and ventilated under-
floor spaces.
The domestic hot water service must be in
accordance with BS 5546 and BS 6700.
Safe handling of substances
Care should be taken when handling the boiler's insula-
tion, which can cause irritation to the skin.
No asbestos, mercury or CFCs are included in any part
of the boiler and its manufacture.
Open vent system requirements
The system should be vented directly off the boiler flow
pipe, as close to the boiler as possible. The cold feed
entry should be inverted and MUST be positioned
between the pump and the vent, and not more than
150 mm away from the vent connection.
There should be a minimum height, 450 mm, of open
vent above the tank water level. The vertical distance
between the highest point of the system and the
feed/expansion cistern water level MUST not be less
than 1000 mm. The pump must be fitted on the flow side
of the boiler.
A suitable pump is a domestic circulator capable of
providing a maximum 11 °C temperature differential
across the boiler with the whole of the heating circuit
open. With the minimum flow circuit allowed by the
controls the differential must not exceed 25 °C
(see also the graph on page 5).
The vertical distance between the pump and
feed/expansion cistern MUST comply with the pump
manufacturer's minimum requirements, to avoid cavita-
tion. Should these conditions not apply either lower the
pump position or raise the tank above the minimum
requirements specified by Buderus. The isolation valves
should be fitted as close to the pump as possible.
The system will work more efficiently when the flow
temperature is as low as possible.
Buderus • http://www.buderus-domestic.co.uk
6 Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Feed / expansion
tank
Water
level
(cold)
22 mm
open vent
Connection
to boilers
fig. 1 Open vent system
Subject to modifications resulting from technical improvements!
450 mm
minimum
1000 mm
15 mm
minimum
cold
feed
150 mm
max.
System
flow to
pump
System
return
Inverted cold
feed entry