Installing A Dhw Cylinder; Filling The Heating System And Checking For Leaks; Making The Electrical Connection - Buderus Logano plus GB402 Installation And Maintenance Instructions Manual

6 Fitting
Fig. 17 Fitting the return (RK)
Connection the diaphragm expansion vessel (DEV)
To safeguard individual boilers, a DEV can be connected to the ¾ inch
connection on the return, in accordance with EN 12828.
▶ Install the DEV on site to maintain the system pressure in the return,
upstream of the pump.
Connecting the drain & fill valve on site
▶ To enable a topping up of the heating water, instruct the user about
the location of the drain & fill valve.
▶ Install a drain & fill valve in the return outside the boiler itself.

6.5.4 Installing a DHW cylinder

Make the connection of a DHW cylinder to the flow and return on site.
The MC10 + BC10 control unit can switch the required external cylinder
primary pump ( MC10/BC10 instructions).
6.6

Filling the heating system and checking for leaks

Before commissioning, check the heating system for leaks to prevent
problems during operation.
▶ To ensure good ventilation, open all heating circuits and thermostatic
valves prior to filling the system.
NOTICE: System damage through boiler scaling!
▶ Note the information specified in the operator's log.
NOTICE: Risk of system damage through excess
pressure when testing for leaks!
Pressure, control and safety equipment may be
damaged by excessive pressure.
▶ Pressure test the heating system after filling with the
pressure that corresponds to the safety valve
response pressure.
18
NOTICE: System damage!
If the heating system is filled when hot, the resulting
temperature stresses can cause stress cracks. The
boiler can then leak.
▶ Only fill the heating system when cold (the flow
temperature should not exceed 40 °C).
▶ Only fill the heating system via a WRAS approved
method in accordance with the water regulations.
▶ Pay attention to the water quality as specified in the
operator's log, and record the volume and quality of
fill water used.
CAUTION: Health risk through contaminated drinking
water.
▶ Observe all country-specific regulations and
standards regarding the prevention of drinking water
contamination.
▶ In Europe, observe standard EN 1717.
▶ Prior to filling the heating system, carefully read the enclosed
operator's log on water quality.
▶ Open safety caps on all automatic air vent valves.
▶ Open the fill & drain valve.
▶ Slowly fill the heating system using a filling facility. During the filling
observe the pressure gauge.
2
1
Fig. 18 Pressure gauge for sealed unvented systems
[1] Red needle
[2] Pressure gauge needle
[3] Green marking
▶ Ensure the heating system is only filled via a WRAS filling method in
accordance with the water regulations. Most commercial heating
system will be at least fluid category 4. The most common way to meet
these requirements is by using an automatic fill unit incorporating an
RPZ.
6.7

Making the electrical connection

The boiler can only function fully with an installed control unit.
DANGER: Risk to life from electric shock!
▶ Prior to all electrical installation work, isolate all poles
of the mains power supply and secure against
unintentional reconnection.
When connecting electrical components, also observe the connection
diagram and instructions of the relevant product.
Logano plus GB402 – 6 720 804 428 (2012/09)
3
6 720 615 876-59.1RS