MODEL EH-M2 ELECTRIC BOILER
Four stage electronic control with energy saving and other features.
EH-08-135-M2 through EH-40-135-M2, single phase, 3 wire, 120/208V, 120/240V
EH-12-345-M2 through EH-40-345-M2, three phase, 4 wire, 120/208V, 120/240V
OPERATION AND INSTALLATION INSTRUCTIONS
CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PAGE
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 & 4
Air Eliminator and Expansion Tanks . . . . . . . . . . . . . . . . . .2
Flow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Wiring (Warning: DO NOT turn on breakers on unit) . . . . . . . . .2
Wall Thermostat Flow Switch and Circulator . . . . . . . . . . .2
“Rough-In” Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Service Connections and Electrical Ratings . . . . . . . . . . . .6
Electrical Connections & Sensor Locations . . . . . . . . . . . . . . . .5
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Fill System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Air Elimination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Bypass Flow Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Check for Proper Boiler and System Operation . . . . . . . . .7
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Control Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Appendix A, B, C, & D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
IMPORTANT:
This manual must be left with owner and should be hung
on or adjacent to the boiler for reference.
M
ONITRON II
LISTED
89C4
Publication No. EH-M2-40 Rev D • Printed in U.S.A. 315
Part No. 792860000
Heating Contractor
Address
Phone Number
Model Number
Serial Number
Installation Date
