Install Instructions
5 EH-M2-40 Boiler Operation and Installation Instructions
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 (See EM-10 Manual for details)
Figure 6. DHW Connections
Boiler outlet
sensor factory
wired and
installed in
cast iron heat
exchanger