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2. Installation
2.1 Install the boiler
Before starting an installation, check that the correct flue
kit and correct capacity cylinder have been supplied.
Important: When soldering plumbing fittings, do not
allow flame from blowtorch to come into contact with
the insulating foam or other non-metallic parts.
Guidance on where to locate the boiler is given in
Sections 1.3 and 1.5. In some instances it will be
advantageous to pre-plumb pipework or to pre-fix
terminal, air/flue pipes and duct .
1. Remove top and front panels (see Fig. 1) and
carefully set aside.
2. Determine boiler final position. The cutaway in the
cylinder base allows pipework to be brought up from
below floor level. Use the dimensions below or the
template on the reverse of the Installation Guide to
pre-drill any holes. Pipes must not obstruct service
access to the immersion heater (if fitted) or to the
condensate trap.
3. Move boiler into position. The need to move as Top
and Bottom sections or as a complete assembly will
depend on the individual installation. The Top has 4
downward facing dowel pins which provide accurate
location on to the cylinder. Take care to avoid trapping
hands and fingers during assembly.
4. Apply sealant to cone faces of both 22mm Union
Nuts (see Fig. 10). Remove cardboard pipework
support. Attach the 15mm x 90° branch pipe joining
the two relief valves/tundish.
Outline of insulation
46
70
43
C/H Flow
Condensate
39
Alternate
C/H Flow or
Gas
Condensate
Dimensions are approximate
All pipes are 22mm
Fig. 9
20
Double arrows are from rear of boiler
550 Overall
119
122
C/H Return
Outline of front panels
5. Remove the DHW temperature sensor from the boiler
fitting kit and uncoil it.
6. Drop down the boiler facia panel. Identify the electrical
connection end of the DHW temperature sensor ("A% in
Fig.9b).
7. Connect sensor end "A% to the two-pin connector (green
wires) from the control box (Fig.9c).
8. Route the sensor cable behind the cylinder pipes and
insert end "B% fully (approx. 310mm) into the cylinder
pocket (Fig.9a).
9. Remove small knock-outs as required either side of
casing for plumbing access. The handholds in the side
panels can also be used. Further access holes allow the
condensate to be routed via the LH panel and the DHW
to be plumbed via the RH panel.
2.2
Connect the Flue System
1. Install the flue system as shown in accordance with these
installation instructions and the flue accessory guide,
observing additional instructions supplied with any flue
accessory.
2.3
Connect the Gas Supply (Fig. 9a)
1. Ensure that the gas supply is isolated.
2. The gas connection to the boiler is 22 mm.
Refer to Section 1.1 for information on the required gas
supply. Do not turn the gas supply on at this stage.
Fig. 9b
"A%
35
60
54
DHW
TPRV
Discharge
Cold
Feed
Outline of base plate
"B%
Fig. 9c
Gas
Cock
(0pen)
Cylinder Pocket
22mm Gas
Connection
Fig. 9a
© Baxi Heating UK Ltd 2015
"A%
-
+
H.W. TEMP
POWER
SEL
+
SEL
MAINS ON
BURNER
LOCK OUT
RESET
C.H. ADVANCE
PROG
-
PROG
RWC
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