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AM Series Boiler & Water Heater User Manual
CHAPTER 5: INSTALLATION – ELECTRICAL
120VAC VOLTAGE TERMINALS
Figure 5-3: Water Heater Electrical Junction Box Connections
5.1.2 Connecting Units in Cascade - Boilers and Water Heaters
Boilers or water heaters may be combined in a cascading system using the optional
Cascade Sequencer (P/N 62110095). A maximum of eight heaters can be connected in a
cascade. Refer to the AERCO Cascade Sequencer user manual (GF-146-CS) for information
on how to set up and use a cascade system using AM water heaters or boilers.
5.1.3 0-10 VDC Input Connections - Boilers and Water Heaters
The AM Series models 500, 750 and 1000 are factory supplied with a Communications Module
(the 399 model can be equipped with one as an option). This allows driving the appliance via a
0-10 VDC analog input. To do this, you must connect the 0-10 VDC supply between terminals
22 and 23 (see Figure 5-3) in the electrical junction box, and the CH mode (parameter 2003 in
the Installer Menu per Section 9.16) must be set to 4 (four). When configured this way, the
heater supply temperature is controlled by the analog input 0-10 VDC as shown in Figure 5-4
where:
•
If the input voltage stays below 1.5V, the heater stays OFF.
•
If the input voltage increases to between 1.5V and 2.0V, the heater start to operate and the
supply temperature stays at the value set for the Minimum CH setpoint (parameter 3018 in
the Factory menu per Appendix B).
•
As the input voltage changes between 2V and 10V, the supply temperature will change
proportionally between the Minimum CH setpoint (parameter 3018 in the Factory menu per
Appendix B) and the Maximum CH setpoint (parameter 3017, in the Factory menu per
Appendix B).
OMM-0100_E • GF-146 • 11/15/2019
(with Direct Storage Tank)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
24VDC VOLTAGE TERMINALS
Jumper (Field supplied)
or aquastat if used (Field
supplied)
Page 58 of 170
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