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GAS PRESSURE SWITCH
DHW THERMOSTAT
ROOM THERMOSTAT /
ZONE CONTROL
FLOW SWITCH
SYSTEM SENSOR
OUTDOOR SENSOR
SEQUENCER / BUILDING
MANAGMENT SYSTEM
LOW VOLTAGE
CONNECTION
BOARD
INLET TEMPERATURE
SENSOR
OUTLET TEMPERATURE /
HI-LIMIT SENSOR
FLUE GAS SENSOR
LOUVER PROVING SWITCH
FLAME SENSOR
LOW WATER CUTOFF
BLOCKED DRAIN SWITCH
DISPLAY PANEL
PC INTERFACE
SMART CONTROL
MODULE
AIR PRESSURE SWITCH
SYSTEM PUMP SPEED CONTROL
O-TEMP
HEAT EXCHANGER SWITCH
IMG00006
Control inputs
Service Manual