Service Manual
1 Service
Control inputs
SYSTEM PUMP SPEED CONTROL
GAS PRESSURE SWITCH
DHW THERMOSTAT
ROOM THERMOSTAT /
ZONE CONTROL
FLOW SWITCH
SYSTEM SENSOR
OUTDOOR SENSOR
SEQUENCER / BUILDING
MANAGMENT 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 
SMART CONTROL
MODULE
IMG00006
8
