Buderus GB402-320-5, Installation And Maintenance Instructions For Contractors

Page: 19 / 64

6 Fitting
Logano plus GB402 – 6 720 820 700 (2018/01) 19
6.5 Establishing the heating circuit connection
6.5.1 Connecting the flow
▶ Insert a gasket between the flange on the boiler and the threaded
flange on the flow.
▶ Secure the flange connection with 4 screws, washers and nuts.
Fig. 13 Fitting the flow (VK)
6.5.2 Installing the safety assembly (on site)
▶ Observe the accessories installation instructions.
▶ Seal in distributor [2] at flow connector [1] using a suitable sealant.
▶ Remove the union at the cap valve fitting [3].
▶ Fit union with gasket to connector of fitting manifold [4] and secure
to the cap valve on the distributor.
▶ Level the fitting manifold and fit maximum pressure limiter [5].
Fig. 14 Installing the fitting manifold
[1] Flow connector
[2] Hydraulic separator
[3] Cap valve
[4] Fitting manifold complete with cap valve ¾ Inch
[5] Maximum pressure limiter
▶ At an operating pressure up to 3 bar, seal in the safety valve at the
distributor connector with a suitable sealant.
Fig. 15 Safety valve (up to 3 bar)
[1] Safety valve
NOTICE: System damage due to leaking connections!
▶ Install all lines free from stress to the boiler
connections.
▶ Use new gaskets if fittings need to be undone.
▶ Only tighten flanges in the heating flow and return
after the connections have been made.
▶ Before installing the pipe connections, check
connections and gaskets on the boiler for possible
damage.
Boiler flow (VK)
Boiler return (RK)
DN80 PN6 standard flange EN1092
Table 10 Water connection dimensions
NOTICE: System damage through incorrect installation!
▶ Install the safety valve and automatic air vent valve or
safety assembly in the flow.
The safety assembly (accessory) comprises an
automatic air vent valve and a pressure gauge. As an
option, it may be converted for use with a safety valve
(additional accessory) and a fitting manifold for the
maximum pressure limiter.
If these accessories are not used, a safety valve,
pressure gauge and an automatic air vent valve must
generally be installed in the flow, upstream of the first
shut-off valve.
Subject to operating pressure, different safety valves are
required.