User manual

Page 17
Automatic air vent
An automatic air vent is mounted on the boiler to remove the air from the water circuit.
REMINDER: This automatic air vent is only used for bleeding the air in the heat exchanger of the
boiler. One or more external automatic air vent(s) and/or air separators must always be mounted in
the heating system to take out the air trapped in the heating circuit.
DE-AERATION PROGRAM. When the unit is fired for the first time the unit starts a de-aeration pro-
gram. One cycle is 5 seconds pump running and 5 seconds pump off. A complete de-aeration pro-
gram consists out of 3 cycles. The de-aeration program can be interrupted/stopped by briefly
pressing the service button during the program.
Automatic water filling systems
When using an automatic water refill system some precautions should be taken (fresh water is
bringing fresh oxygen into the system), like installing a water meter to measure and evaluate the
total water volume that is added to the system This to detect and eliminate any water leakage as
soon as possible.
When an automatic water refill system is used, some form of logging should take place to prevent
continuously filling of the system with large amounts of oxygenated fresh water. This can happen
when a leak in the system is not detected and the total added water amount is not being logged.
Water pressure
The minimum water pressure of the heating system is advised to be 1 bar (0.8 on application) and
the maximum system pressure is up to 4 bar. 6 bar at NO extra cost on application. These values
can be changed at the boiler control settings. The normal minimum water pressure is supposed to
be 1,0 bar. There is a water pressure sensor built into the boiler that will stop the boiler from firing
when the water pressure drops below the 0,8 bar. When the water pressure reaches above 1,0 bar
the boiler will start firing again when heat is demanded.
Chemical water treatment
· Fill water: Use Sentinel X100 (only) additive to the water for the central heating. The pH val-
ue should be between 8.2 and 9.5 (if not, we suggest you contact Strebel). Test the water.
Use additive as required. Hardness should be 5 to15 degree F (French) see also page 16
& 33
Flush the system with fresh water
The water of the boiler and heating circuit should be free of any particles, debris and pollution.
Therefore the complete installation must always be thoroughly power flushed with clean water be-
fore installing and filling the boiler (s). Automatic dirt separators will help keep water clean but
flushing first is always required