Installation & Servicing instructions
AT
AG XL
15
5.4 Connecting the boiler
A. Remove the remaining packaging part from the bottom of the boiler.
Note: this packaging part is provided with boiler parts which are needed for
mounting the boiler.
B. Cap the connections that are not used on the pipe work headers:
Flow and return:
ø35mm blind compression fitting
(2 items/boiler)
Gas:
1 ¼" blind cap with gasket
(1 item/boiler)
For connections, use the supplied gaskets. Check all connections for leak
-
age and gas-tightness.
C. Connecting the isolation valves to the boiler:
Flow: 1½" flat coupling x 35mm compression isolation valve with red handle
Return: 1½" flat coupling x 35mm compression fitting cross union with
fill/drain valve and isolation valve with blue handle
The boiler is supplied with a 3 and 4 bar safety valve.
ATAG UK recommend fitting the 4 bar safety valve due to the control settings shutting
the boiler off at 3.8 bar.
Gas: 1¼" x 28mm gas isolation valve
Polluted test water may be released when removing the plastic caps on the
boiler flow and return.
For connections, use the supplied gaskets. Check all connections for leak
-
age and gas-tightness.
D. Connect the valves to the pipe work headers:
Flow: 35mm pipe pieces with 35mm compression fittings (elbow and socket)
Return: 35mm pipe pieces with 35mm compression fittings (elbow and socket)
Gas: 28mm pipe piece with 1¼" flat and 28mm compression fitting
Back-to-back installation:
Flow: 35mm pipe pieces with 35mm compression fittings (bend and socket)
Return: 35mm pipe pieces with 35mm compression fittings (bend and socket)
Gas: 28mm pipe piece with 1¼" flat and 28mm compression fitting
For connections, use the supplied gaskets. Check all connections for leak
-
age and gas-tightness.
E. Fill the siphon with tap water and fit the siphon cup underneath the boiler.
The siphon cup is supplied separately and can be found behind the housing
.
Figure 5.4.b
Figure 5.4.c
Figure 5.4.d
Figure 5.4.a
