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PRIMARY/SECONDARY
GAS PRESSURE SWITCH
ROOM THERMOSTAT /
ZONE CONTROL
FLOW SWITCH
SYSTEM SENSOR
OUTDOOR SENSOR
SEQUENCER / BUILDING
MANAGMENT SYSTEM
LOW VOLTAGE
CONNECTION
BOARD
PRIMARY/SECONDARY INLET
TEMPERATURE SENSOR
PRIMARY/SECONDARY OUTLET
TEMPERATURE SENSOR
PRIMARY/SECONDARY
FLUE GAS SENSOR
PRIMARY/SECONDARY
HIGH LIMIT SENSOR
PRIMARY/SECONDARY
FLAME SENSOR
LOW WATER CUTOFF
BLOCKED DRAIN SWITCH
TOUCH PANEL
INTERFACE
PC INTERFACE
SECONDARY
SMART CONTROL
MODULE
PRIMARY
SMART CONTROL
MODULE
HW TANK SENSOR
HW THERMOSTAT
TOUCH DISPLAY
MODBUS COMMUNICATION
BOARD
O-TEMP
HEAT EXCHANGER SWITCH
O-TEMP
HEAT EXCHANGER SWITCH
IMG00004
Control inputs
1 Service (continued)
7
Service Manual