Connecting Diagrams; System Filling And Pressurising; Domestic Hot Water Circuit - Baxi EcoBlue Advance Combi 28 Installation And Service Manual

5 Before Installation
Stop
Valve
DHW
Mains
Fig. 18
Inlet
Filling Loop
Connections
Other Tap
Outlets
Expansion
Vessel*
Check
Valve*
Pressure
Reducer Valve*
Stop Tap
Fig. 19
Where Low Flow Taps or Fittings are
intended to be used in the DHW system connected to
a Baxi EcoBlue Advance Combi it is strongly
recommended that the DHW flow rate DOES NOT fall
below 2.5l/min. This will ensure reliable operation of
the DHW function.
36 EcoBlue Advance Combi
Double
Stop
Check
Valve
Valve
Temporary
Loop
CH
Return
Boiler
To Hot
Taps
*See 5.6.2. for instances
when these items may be
required
5.6

Connecting Diagrams

5.6.1

System Filling and Pressurising

1. A filling point connection on the central heating return pipework
must be provided to facilitate initial filling and pressurising and
also any subsequent water loss replacement/refilling.
2. A filling loop is supplied with the boiler. Follow the instructions
provided with it.
3. The filling method adopted must be in accordance with all
relevant water supply regulations and use approved equipment.
4. Your attention is drawn to:
for GB: Guidance G24.2 and recommendation R24.2 of the Water
Regulations Guide.
for IE: the current edition of I.S. 813 "Domestic Gas Installations".
5. The sealed primary circuits may be filled or replenished by
means of a temporary connection between the circuit and a
supply pipe, provided a 'Listed' double check valve or some other
no less effective backflow prevention device is permanently
connected at the inlet to the circuit and the temporary connection
is removed after use.
5.6.2

Domestic Hot Water Circuit

1. All DHW circuits, connections, fittings, etc. should be fully in
accordance with relevant standards and water supply regulations.
2. Your attention is drawn to:
for GB: Guidance G17 to G24 and recommendation R17 to R24
of the Water Regulations Guide.
for IE: the current edition of I.S. 813 "Domestic Gas Installations".
3. The Water Regulations recommendations for England and
Wales prohibits backflow from appliances into the wholesome
water supply due to thermal expansion. However this type of
instantaneous combination boiler, with less than 15 litres of stored
capacity, does not require any backflow prevention device as any
thermal expansion is accommodated within the appliance.
It is possible in certain circumstances that other cold water
demands (e.g. washing machines, flushing of W.C.s) may affect
the DHW function of the boiler. In these instances the fitting of a
backflow prevention device and expansion vessel is
recommended.
If a check valve, loose jumpered stop cock, water meter
or water treatment device is fitted (or may be in the
future) to the wholesome water supply connected to the
boiler domestic hot water (DHW) inlet supply then a
suitable expansion device may be required.
4. The boiler's maximum working mains pressure is 8 bar,
therefore all pipework, connections, fittings, etc. should be
suitable for pressures in excess of 8 bar. A pressure reducing
valve must be fitted for pressures in excess of 8 bar. The
manufacturer of any outlet fittings, such as a shower valve, may
require a lower maximum pressure. The pressure reduction must
take account of all fittings connected to the DHW system.
Comp No. 7212138 - 02 (06/14)