Connecting The Boiler To The Heating System; B-Kit Installation - Buderus LOGANO PLUS GB312 Installation Instructions Manual

6.9.2 Connecting the boiler to the heating system

CAUTION: Risk of system damage due to leaking
connections.
▶ Connect up the connecting pipes to the boiler in such
a way that they are not under stress.
Boiler Boiler supply (VK)
Boiler return (RK)
90-4 to 280-8 NPT 2½ "
Table 10 Water connection sizes
VK
RK
Fig. 23 Water connection
[RK] Boiler return
[VK] Boiler flow

6.9.3 B-kit Installation

The pressure relief valve, the temperture/pressure gauge and the non-
return check valve are connected to the boiler supply VK using the
supply manifold (included in B-kit).
CAUTION: Risk of system damage due to incorrectly
fitted B-kit or failure to fit non-return valve.
▶ Make sure that the non-return check valve is fitted
correctly (observe arrow). The arrow indicates the
direction of flow. The non-return check valve prevents
water flow in the opposite direction to the arrow.
▶ Fit the B-kit including non-return check valve with the direction of flow
away from the boiler (observe arrow on non-return valve).
▶ Align the B-kit so that the temperature/pressure gauge faces
horizontally outwards to the side of the boiler and the pressure relief
valve points upwards ( Fig. 24).
▶ Insert seal in flange joint and tighten evenly.
Fitting an automatic air vent to the B-kit on the flow pipe
is recommended.
▶ Fit and seal the safety valve in the connection provided using the NPT
double union supplied ( Figs. 23 and 24).
Logano plus GB312 – 6 720 647 367 (2012/11)
▶ Fit and seal the temperature/pressure gauge in the connection
provided ( Fig. 24).
Any additional safety devices required can be fitted and sealed in the
remaining connections. Follow the manufacturers' instructions.
VK 10
8 11
Fig. 24 B-kit Installation
[1] Nut and washer 4x
[2] Check valve 1x
[3] Supply pipe (external)
[4] Screw 4x
[5] Washer 4x
[6] NPT thread (on external supply pipe)
[7] Gasket 2x
[8] Gasket 1x
[9] Threaded flange, 2½ " x 2½ ", NPT
[10] Pressure relief valve (safety valve)
[11] Pressure/temperature gauge
[VK] Boiler flow
If a high limit safety cut-out is installed according to
ASME-CSD1 on the flow piece of the (B-kit), heed the
following:
▶ At the plant, a pump post purge time of
5 minutes is set on the BC10 controls. This value can
be increased but not reduced.
▶ If an external controller controls the recirculation
pump, a pump post purge time of 5 minutes must be
ensured.
▶ Close off unused connections with ¾ " NPT plugs and seal.
▶ Install a blow-off pipe to the external side of the pressure relief valve.
CAUTION: Risk of system damage due to incorrect
fitting.
▶ Make sure that the B-kit including pressure relief valve
and non-return check valve is not omitted from the
boiler flow VK and correctly connected.
Installing the boiler
1 2 5 4 NPT
7 9 6 3
7 747 010 720-03.1RS
6
25