Unigas P91A, Manual

Page: 60 / 167

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