50 Installation Check list
After installing the boiler, review the following checklist. Complete the boiler start-up process by carrying out the checks listed in the
table below.
If you have additional questions or need assistance with installation, contact an official Technical Assistance Service (TAS), or refer to the
technical support section of Navien’s website (www.navien.co.uk).
Installing the Boiler
Yes
No
Have you maintained the proper service and maintenance clearances?
Is the boiler and flue piping clear of combustible materials, including clothing,
cleaning materials, and rags?
Connecting the Space Heating Piping
Yes
No
Did you wash the pipeline to prevent any deposits, fluxes, solder, scale, debris, or
other impurities that could harm the boiler before connecting the heating pipe to the
boiler?
Has the system been filled(less than 1 bar) and purged of air?
Is there an expansion tank installed and set to the proper system pressure?
If antifreeze has been used, is it the proper type and is the concentration appropriate?
Did you install an automatic bypass valve of at least 6ℓ/min when connected to
radiators with thermostatic valves?
Did you check for leaks in space heating piping?
Is the exposed outdoor heating pipe properly insulated?
Connecting the Pressure Relief Valve
Yes
No
Have you installed an approved pressure relief valve on the boiler?
Does the rating of the pressure relief valve match or exceed the maximum bar rating
of the boiler?
Connecting the Condensate Drain
Yes
No
Have all condensate pipework must ‘fall’ from the appliance by a minimum of 3
degrees (52 mm per metre) to ensure adequate condensate flow?
Have you ensured that air is returned to the unit in the pipework work path for the
condensate trap to function properly?
If you connected to a rainwater pipe, did you block the air flow?
Are the external piping as short as possible and not more than 3 meters in length?
Is the external piping ideally isolated by increasing the minimum diameter to 32 mm
and insulated?
10. Installation Check list
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