Modbus Instructions
7Diagrams
Figure 7-1 Ladder Diagram_Part 1
BOX DEPICTS
OPTIONAL ITEMS
LOW VOLTAGE 120 VAC HIGH VOLTAGE
CONTROL | CONTROL | |
MODULE 1 |
| MODULE 2 |
LOUVER |
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RELAY 1 | X8 |
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X8 |
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| 24V | LOUVER |
| 24V |
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| RELAY 2 |
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| FLAP |
| AIR PRESSURE | FLAP | AIR PRESSURE | ||
| VALVE | ||||||
| SWITCH | VALVE | SWITCH | ||||
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INLET |
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| INLET |
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SENSOR |
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| SENSOR |
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OUTLET |
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| OUTLET |
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SENSOR |
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| SENSOR |
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FLUE |
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| FLUE |
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SENSOR |
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| SENSOR |
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| BLOCKED |
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| DRAIN |
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| AUTO RESET | AUTO RESET | ||||
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| HIGH LIMIT |
| HIGH LIMIT | ||
GAS VALVE |
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| GAS VALVE |
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| GAS VALVE |
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| GAS VALVE |
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| RELAY |
| RELAY | ||
BLOWER |
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| 1 | BLOWER | 1 | ||
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| 2 |
| 2 | ||
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| 4 |
| 4 | ||
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| 5 |
| 5 | ||
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| TR1 |
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| TR1 |
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SPARK |
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| FLAME ROD | SPARK | FLAME ROD | ||
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ROD |
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| ROD |
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CAUTION | HIGH VOLTAGE SPARK LEAD |
| CAUTION | HIGH VOLTAGE SPARK LEAD |
SHIELD
CASCADE
RS485
SHIELD
TANK
SENSOR
OUTDOOR
SENSOR
SYSTEM
SENSOR
-
EXTERNALCONTROL 10VDC
+
SHIELD
MOD BUS
RS485
SHIELD
CONNECTION BOARD
CN3 | |
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4CONTROL MODULE 1
X4
MOD BUS
KIT
CONTROL MODULE 2
X4
20 
NOTES:
1. Where possible, switches are shown without utilities (gas, water or
LADDER DIAGRAM
electricity) connected to the unit. As such, actual switch states mayLBL20058 REV E vary from those shown on diagrams depending upon whether utilities
are connected or a fault condition is present.
2. See wiring diagram for additional notes.