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Siemens Building Technologies
Basic Documentation RVA47.320
CE1P2379E
HVAC Products
Description of the heating engineer settings
15.07.2002
4.48
Switch-on delay lag boilers
•
Smooth operation due to stable operating conditions
•
Adjustable rate of release of total capacity
After a BMU has switched on, an adjustable period of time must elapse until another
BMU can be switched on.
1. Press the operating line selection buttons to select operating line 133.
2. Press the + / - buttons to enter the number of minutes on completion of which
another BMU can be switched on.
Setting range
Unit
Factory setting
1...120 Minutes 5
For stability reasons, each BMU added to the cascade will first run in its basic stage for
about one minute. This minute is already contained in the adjusted switch-on delay.
Correct adjustment of the switch-on delay ensures that plant operating conditions will
be stable. This prevents frequent cycling of the BMUs.
The function is only active with "Serial 2" (setting on line OEM 61 = 0)
4.49
Restart lock of BMUs
•
Too frequent switching on / off cycles of the BMUs will be avoided
A BMU that has just been switched off can be switched on again only after an
adjustable period of time has elapsed.
1. Press the operating line selection buttons to select operating line 134.
2. Press the + / - buttons to enter the number of minutes on completion of which a
switched off BMU can be switched on again.
Setting range
Unit
Factory setting
0...1800 Seconds 300
The restart lock ensures that a BMU that has just been switched off will not be switched
on again a short time later. The BMU will be released again only after the adjusted
period of time has elapsed. This prevents frequent cycling of the BMUs and ensures
that plant conditions will be more stable.
Benefit
Description
Setting
Effect
Note
Benefit
Description
Setting
Effect
