AMR Integrated Water Heaters (Supplement to GF-146)
CHAPTER 5: INSTALLATION – ELECTRICAL
5.1.3 0-10 VDC Input Connections – 500R Model (Option for 399R)
The AMR Integrated model 500R is 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 in AM user manual
GF-146
) 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 5-5 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).
Figure 5-5: 0-10 VDC Analog Input Algorithm
5.1.4 MODBUS Interface Connections – 500R Model Only
The AMR Integrated 500R model is factory supplied with a Communications Module (the 399
model can be equipped with one as an option). This MODBUS interface can be connected to
drive the unit from a building management device. Refer to the AM Series MODBUS User
Manual (GF-146-MB), which is available from AERCO technical support and the AERCO
website (
Page
30
of
52
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0106_0A
PRI - 07/22/15
Ph.: 800-526-0288
GF-146-IR
