Testing The Water System - Navien LCB700-21RS Installation & Operation Manual

Refer to the following illustration for system fill.
The system must be filled with approved
Note
equipment and comply with all regulations for
system fill.
The expansion vessel fitted is supplied with a
charge pressure of 1.0 bar. Do not pressurise the
vessel above 1.5 bar.
To perform an air purge after initially filling the
boiler pipes, the pump will run for 5 minutes and
20 seconds. The boiler will operate normally after
performing an air purge.
Central Heating Return
Ball Valve
Temporary Loop
Double
Non-Return Valve
Ball Valve
Cold Water Inlet
Pressure
Gauge

4.6 Testing the Water System

WARNING
Ensure that the boiler is full of water before firing the burner.
Operating the unit without filling it will damage the boiler.
Such damage is not covered by the warranty, and may result
in property damage or severe personal injury.
Perform a fill test after installing the boiler's water system to
make sure that the system has been installed properly. Follow
the instructions below to perform a fill test on the water system.
1. Close the manual air vent and the boiler drain valve.
2. Fill the boiler. The correct pressure will vary with each
application.
3. If the pressure is lower than the minimum pressure set (0.4
bar by default), error code E302 will appear on the display.
4. Fill the boiler with more water until the error message
disappears.
5. At initial fill and during boiler start-up and testing, check
the system thoroughly for leaks. Repair any leaks before
proceeding further.
WARNING
Eliminate all system leaks. The continual introduction of fresh
makeup water will reduce boiler life. Minerals can build up in
the heat exchanger, reducing heat transfer, overheating the
heat exchanger and causing heat exchanger failure.
CAUTION
Before operating the boiler for the first time, ensure that the
boiler system is filled with water. Purge the air inside the
system to avoid damage to the boiler.
Installing the System Piping 27