A.O. Smith 100 Series, Руководство по обслуживанию

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Servicing should only be performed by a Qualified Service Agent
CONTROL BOARD ASSEMBLY
The Control Board assembly provides heat control, flame supervision, circulation pump control, fan control, boiler/water heater
control sequencing, and electric ignition function. It will also provide boiler/water heater status and error reporting. The Control Board
may consist of Control Device, Touchscreen Display (required for setup and ModBus communication, but not required for the system
to operate once the Control Device is programmed), Local Operator Interface (which can set up and monitor the Control Device),
Local Keyboard Display Module, Flame Rod, Temperature Sensor (NTC Type 10KΩ at 77°F (25°C) or 12KΩ at 77°F (25°C)), Limit
Sensor (NTC Type 10KΩ at 77°F (25°C)) and Fans (VFD).
INPUTS
Analog Inputs:
1. NTC Sensor Imputs (10kohm or 12kohm)
NOTE: 12kohm and 10kohm single sensors cannot be used for Limit Application functions (10kohm dual sensors only).
2. Hydronic Control
• Outlet Limit and Temperature
• Stack Limit and Temperature
• Inlet Temperature
• Outdoor Temperature
3. Other Analog Inputs
• PWM Feedback
• Flame Signal from either a Flame Rod or Ultraviolet Detector
• 4-20mA Control Input, Remote Setpoint, Remote Firing Rate
Digital Inputs:
1. LCI (Load [or Limit] Control Input)
2. Interlock
3. Annunciation
OUTPUTS
Analog Outputs:
1. Modulation
•
4-20mA
• 0-10 VDC
• PWM for Variable Frequency Drives
Digital Outputs:
1. Auxiliary Output Control
• Hydronic Control for Pumps 3 outputs, 5 different programmable features
2. Combustion Blower
3. External Ignition
4. Gas Valve
5. Alarm