Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions
Page 56 of 144 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0095_0H
09/15/2017 Phone: 800-526-0288 GF-139
4.27 GENERAL LADDER DIAGRAM
Figure 4-22: General Ladder Diagram
4.28 E8 CONTROLLER AND BCM TERMINAL ASSIGNMENTS
On the rear panel of the E8 controller, there are two terminal blocks, one of which is for the
mains (120 V) connections, and the other for the low voltage connections.
The main controls, necessary for the C/H system management and for the boiler control, as well
some components which are part of the boiler housing, must be connected to the terminal
blocks. See Figure 4-23 for a wiring diagram showing the E8 controller terminal wiring, and see
Figure 4-24 for a wiring diagram of sensor and BCM terminal wiring.
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