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12
Low Level Alarm – Sequence of Operation – A Card
Low Level Cutoff – Sequence of Operation – A Card
operation
REFERENCE
PROBE
13 18
LOW
ALARM
PROBE
CIRCUIT CARD
with RELAY
DE-ENERIZED
CONTROL PANEL
Power OFF
Relay
Contact
Closed
CIRCUIT CARD
with RELAY
ENERIZED
CONTROL PANEL
Power ON
Relay
Contact
Open
Water
Level
Dropping
ENERIZED
CONTROL PANEL
Power ON
Relay
Contact
Closed
Low
Alarm
Condition
1. 2. 3.
REFERENCE
PROBE
13 18
CIRCUIT CARD
with RELAY
REFERENCE
PROBE
13 18
13 19
CIRCUIT CARD
with RELAY
DE-ENERIZED
CONTROL PANEL
Power OFF
Relay
Contact
Open
CIRCUIT CARD
with RELAY
ENERIZED
CONTROL PANEL
Power ON
Relay
Contact
Closed
ENERIZED
CONTROL PANEL
Power ON
Relay
Contact
Open
1. 2. 3.
13 19
CIRCUIT CARD
with RELAY
13 19
LOW
ALARM
PROBE
LOW
ALARM
PROBE
REFERENCE
PROBE
LOW
CUTOFF CUTOFF CUTOFF
PROBE
REFERENCE
PROBE REFERENCE
PROBE
LOW
PROBE
LOW
PROBE
Water
Level
Dropping
Low
Cutoff
Condition
CUSTOMER
CONNECTION
10
9
9A
CUSTOMER
CONNECTION
CUSTOMER
CONNECTION
10
9
9A
10
9
9A
CUSTOMER
CONNECTION
10
9
9A
CUSTOMER
CONNECTION
CUSTOMER
CONNECTION
10
9
9A
10
9
9A
Water
Level
Water
Level
ENERGIZED
ENERGIZED