Service Manual
1 Service
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The Building Screen displays information that is specific to the Building Automation System and is being transmitted through the Modbus communication link:
Modbus Address - This is the address of a specific SYNC boiler. This address is set by dip switches on the Modbus communication board. The value displayed here should be the same as the value of the dip switches. The Building Automation System should use this address to communicate with the boiler.
Boiler Enable - This displays the enable status that has been transmitted to the boiler by the Building Automation System.
Boiler State - This displays the state code of the boiler. Please reference the SYNC Modbus Instruction Manual for a full definition of each code.
Boiler Command - This displays the value written to register 40003 of the Modbus communication board by the Building Automation System. The value is displayed as the percent of firing rate, 80 = 80% firing rate.
Effective Setpoint - This displays the value written to register 40003 of the Modbus communication board by the Building Automation System. The value is displayed as the effective setpoint in degrees (°F or °C).
Note: The boiler can be configured to operate off the boiler command or the effective setpoint. The boiler configuration determines which value is meaningful.
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