8
Phase
number
Function
LOC
Lockout phase
OFF
Standby, waiting for heat demand
oP
Operation, modulating operation
oP1
Interval until release of load controller target (analog or 3-position step input)
01
Under voltage
02
Safety loop open
04
Extraneous light on burner startup (timeout/locking after 30 seconds)
08
Mains ON/test phase (e.g. detector test)
10
Shutdown, actuator opens in CLOSE position (homerun)
21
Safety valve ON, air pressure switch OFF, actuator opens in CLOSE position
22
Part 1: Fan motor ON
Part 2: Specified time (t10) air pressure switch (LP)
Message (timeout) stabilization air pressure switch
24
Actuator opens in prepurge position
30
Part 1: Prepurge time (t1) without extraneous light test
Valve proving after mains ON, lockout
Part 2: Prepurge time (t1) with extraneous light test
36
Actuator closes in ignition load
38
Preignition (t3)
40
Postignition time (t3n), parameter 257 + 0.3 seconds
42
Flame detection
44
Interval (t4): End of safety time (TSA) and burner valve 2 ON
50
2nd safety time (t9)
54
Parameter 259.01: Actuator opens in > low-fire
Parameter 260: Actuator closes in low-fire
72
End of operation, checking if valve proving (LT) shall be performed
74
Postpurging (t8)
80
Test space evacuation (td4)
81
Test time (td1) fuel valve 1 (V1)
82
Test space filling (td3)
83
Test time (td2) fuel valve 2 (V2)
90
Pressure switch-min open safety shutdown
*1
Valve proving is conducted when…
- parameter 241.00 = 1 and parameter 241.02 = 1, or
- parameter 241.00 = 1 and parameter 241.01 = 0
*2
Valve proving is conducted when…
- parameter 241.00 = 1 and parameter 241.02 = 1, or
- parameter 241.00 = 1 and parameter 241.01 = 1
*3
Valve proving (LT) will not be performed
