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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 6 Basic unit 01.12.2009
Pressure switch-max-oil
In all types of oil trains, the maximum oil pressure is monitored from phase 22. If the
maximum oil pressure is exceeded after the maximum time (P214) has elapsed, or dur-
ing the subsequent phases, the system initiates lockout.
No. Parameter
214 Max. time start release
Error
code
Diagnostic
code
Meaning for the LMV37.4... system
14 0 POC open
1 POC closed
21 0 Pressure switch-max (Pmax): Max. oil pressure ex-
ceeded
POC: POC open (software version ≤V02.00)
1
POC: closed (software version ≤V02.00)
During the safety times (TSA1 / TSA2), the signal from pressure switch-max is only as-
sessed after a certain period of time has elapsed in order to ignore the pressure shocks
that occur the moment the valves open.
No. Parameter
269
Oil: Time to respond to pressure faults within safety time 1 (TSA1) and safety
time 2 (TSA2)
The connection facility can also be used for POC (proof of closure) (see sequence dia-
gram).
No. Parameter
277
Oil: Pressure switch-max- / POC input
0 = inactive
1 = Pressure switch-max
2 = POC
&
Note
If the input is used for POC, pressure switch-max can be included in the safety loop.
In that case, pressure switch-max must not be installed between the valves, but al-
ways downstream from them.
Start release oil
If the input is simultaneously used as a start release input, e.g. for an air supply damper,
the latter can be connected in series with the pressure switch.
Parameters with POC functionality cannot be used as start release input.
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