Service Manual
1Service
Control inputs
SYSTEM PUMP SPEED CONTROL
GAS PRESSURE SWITCH
DHW THERMOSTAT
ROOM THERMOSTAT /
ZONE CONTROL
FLOW SWITCH
SYSTEM SENSOR
OUTDOOR SENSOR
BUILDING MANAGEMENT
SYSTEM
LOW WATER CUTOFF
INLET TEMPERATURE
SENSOR
OUTLET TEMPERATURE /
FLUE GAS SENSOR
LOW VOLTAGE CONNECTION BOARD
AIR PRESSURE SWITCH
LOUVER PROVING SWITCH |
FLAME SENSOR |
BLOCKED DRAIN SWITCH
DISPLAY PANEL
PC INTERFACE 
8
SMART CONTROL
MODULE
