Filling The Heating System And Checking For Leaks - Buderus Logano plus GB402 Installation And Maintenance Instructions For Contractors

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!
▶ Observe the water quality requirements in
accordance with the "Water Quality Operators Log"
and enter the volume and quality of the fill water.
NOTICE: Risk of system damage through excessive
pressure when testing for leaks!
Pressure, control and safety equipment may be
damaged by excessive pressure.
▶ After filling the system pressure test to the release
pressure of the safety valve
NOTICE: Risk of 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).
▶ When the heating system is in operation, never
fill it via the boiler drain & fill valve. Instead, only
use the filling valve in the heating system
pipework (return).
▶ 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 and drain valve.
Logano plus GB402 – 6 720 820 700 (2018/01)
▶ Slowly fill the heating system using a filling facility. During the filling
observe the pressure gauge.
1
Fig. 18 Pressure gauge for sealed systems
[1] Red needle
[2] Pressure gauge needle
[3] Green marking
▶ Close the water tap and the drain & fill valve once the required test
pressure has been reached.
▶ Check the connections and pipework for leaks.
▶ Vent the heating system via the radiator air vent valves.
▶ Top up with water if the pressure drops as a result of venting the
system.
▶ Remove the hose from the drain & fill valve.
▶ Carry out a leak test in accordance with locally applicable
regulations.
▶ Once the heating system has been tested and no leaks have been
found, set the correct operating pressure.
Fitting 6
2
3
6 720 615 876-59.2T
21