MODEL EH ELECTRIC BOILER
EH-08-135-S2 through EH-40-135-S2, single phase, 3 wire, 120/208V, 120/240V
EH-12-345-S2 through EH-40-345-S2, three phase, 4 wire, 120/208V, 120/240V
OPERATION AND INSTALLATION INSTRUCTIONS
CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PAGE
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Air Eliminator and Expansion Tanks . . . . . . . . . . . . . . . . . .2
Flow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Wall Thermostat Flow Switch and Circulator . . . . . . . . . . .2
Typical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Service Connections and Electrical Ratings . . . . . . . . . . . .2
Rough-In Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Electrical Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Typical Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Typical Zone Valve Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Fill System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Air Elimination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Bypass Flow Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . .7
Check for Proper Boiler and System Operation . . . . . . . . .7
Operation (models equipped with seq. control system) . . . . . . .7
Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Appendix A, B, C & D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
IMPORTANT:
This manual must be left with owner and should be hung
on or adjacent to the boiler for reference.
Wiring diagram located on inside front panel.
S2
Heating Contractor
Address
Phone Number
Boiler Model Number
Boiler Serial Number
Installation Date
Part # 790920000 • Publication EH-40-S2 Rev A • Printed in U.S.A. 519
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