Unigas P91A, Manual

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14
List of phase with display AZL2x :
Phase number Function
Standby
OFF
Standby, waiting for heat request
Ph08 Power ON / test phase (e.g. detector test)
Startup
Ph21 Safety valve ON, air pressure switch test / POC test (timeout / locking after 5
seconds), actuator opens in low-fire position / CLOSE position
Ph22 Fan motor ON or air pressure switch test / settling time
Ph24 Actuator travels to the prepurge position
Ph30 Prepurging
Ph36 Actuator closes until ignition load / low-fire is reached, and parameter 259.02:
Actuator opens to a position > ignition load
Ph38 Preignition
Ph40 1st safety time (TSA1) / ignition transformer ON
Ph42 Safety time (ignition transformer OFF), flame check
Ph44 Interval: End of safety time and fuel valve 1 (V1) ON
Ph50 2nd safety time (TSA2)
Ph54 P259.01: Actuator opens in > low-fire
Ph54 P260: Actuator closes in low-fire
oP1 Interval until release of load controller target (analog or 3-position step input)
Operation
oP Operation, modulating operation
Shutdown
Ph10 Shutdown, actuator opens in CLOSE position (home run)
Ph72 Actuator opens in high-fire position / end of operation
Ph74 Postpurging
Valve proving
Ph80 Test space evacuating
Ph81 Checking time fuel valve 1
Ph82 Test space filling
Ph83 Checking time fuel valve 2
Waiting phases
(start prevention)
Ph01 Undervoltage
Ph02 Safety loop open
Ph04 Extraneous light at burner startup (timeout / locking after 30 seconds)
Ph90 Pressure switch-min open → safety shutdown
Lockout
LOC Lockout phase