Strebel S-CBX 105, Руководство по установке, эксплуатации и техническому обслуживанию

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7.16 De-Air sequence.
The De-Air sequence it is a safety function starting at every power ON and is used to remove the air from the heat-
exchanger. The De-Air sequence also starts after a general reset (such as the locking error reset or 24 hours reset)
The display will show ‘dAir’ indicating that the controller is performing the De-Air sequence to purge the heat
exchanger of air, by sequencing the pump OFF and ON. The user can cancel the De-Air sequence by pressing a
specific key-button combination from the display. By default “De-Air” sequence takes around 14 minutes.
• 1st cycle: The 3 ways valve moves to CH position and the general pump is activated for 10 seconds, deactivated
for 10 seconds, activated again for 10 seconds and then deactivated again for 10 seconds (DAir_Repeation_OnOff,
which means ON/OFF/ON/OFF each time for 10 seconds = 40 seconds in total).
• 2nd cycle: it starts when 1st cycle is ended. The 3 ways valve is moved to DHW position and repeats the same
cycling of the pump (DAir_Repeation_OnOff, which means ON/OFF/ON/OFF each time for 10 seconds = 40 second
in total).
This sequence (1st 2nd cycles) is performed DAir_Number_Cycles times (if DAir_Number_Cycles is 3 ‘De-
air’ sequence lasts (3 x 40) x 2 = 240 seconds).
During De-Air sequence no demand will be served. When the water pressure is too low or pressure sensor is in
error, the De-Air sequence will be suspended until water pressure / sensor pressure is stable again. In that case
the De-Air sequence will last longer than the estimated minutes.
The following scheme below shows the behaviour of the 3-way valve and general pump during one whole cycle of
De-Air sequence with a DAir_Repeation_OnOff set to 2.
Relevant variables:
Specific Parameters Level (Default) Value Range
De-Air Config
Configuration for the De-Air function
2:
Installer
1 0: 24 hr pump
1: De-Air
2: Disabled
De-Air State 1: User - -
Current state of the De-Air function.
De-Air Repeation Cnt
On/Off repeation count for a De-Air cycle.
2:
Installer
2 0…255
De-Air Cycles
Number of De-Air cycles.
2:
Installer
3 0…255
7.17 Automatic Feed Valve systems
If an automatic feed valve is installed in the system, it should not be left open indefinitely. A continuous feed of
fresh water could damage the system (fresh water is bringing fresh oxygen into the system). It is recommended
that after a short period of time following the installation of the boiler into a heating system that the automatic feed
valve be closed
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.