Slant/Fin EH-M3 - Manual (Page 7)

EH-M3-40 Boiler Operation and Installation Instructions 7
Figure 5. Electrical Connections
BTC
Mode 4
Relay
Outdoor
Sensor
Boiler Inlet Sensor (Included)
Factory
Installed
Boiler
Outlet
Sensor
BTC
Mode 5
Outdoor
Sensor
Relay
Factory
Installed
Boiler
Outlet
Sensor
Boiler Inlet Sensor (Optional)
Secondary
Piping
Sensor
(Included)
Figure 5A. Sensor Location
Boiler outlet
sensor factory
wired and
installed in
cast iron heat
exchanger
Figure 6. DHW Connections