1Service
Control inputs
GAS PRESSURE SWITCH
(OPTIONAL)
DHW THERMOSTAT
FLOW SWITCH
TANK SENSOR
SEQUENCER / BUILDING
MANAGEMENT SYSTEM
LOW WATER CUTOFF
(OPTIONAL)
INLET TEMPERATURE
SENSOR
OUTLET TEMPERATURE
SENSOR
FLUE GAS SENSOR
AIR PRESSURE SWITCH
HIGH LIMIT SENSOR
FLAME SENSOR
BLOCKED DRAIN SWITCH
DISPLAY PANEL
PC INTERFACE
(OPTIONAL)
6
Service Manual
LOW VOLTAGE
CONNECTION
BOARD
SMART SYSTEM
CONTROL BOARD