AERCO AM Series Boiler User Manual - Manual (Page 59)

AM Series Boilers and Water Heaters
CHAPTER 3 – INSTALLATION
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 59 of 156
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Priority selection is a functionality that toggles between heating and DHW demand when they
are both active at the same time. The priority selection is set with the 2067 (DHW Priority)
parameter in the Installer Menu (see Section 5.4).
• If parameter 2067 is set to “0”, the boiler will load the indirect water heater for the time
set in parameter 2063 and, after that, heating will take place for the same amount of
time.
• If parameter 2067 is set to “1”, the boiler is prioritized for heating functionality.
• If parameter 2067 is set to “2”, the boiler is prioritized for indirect water heating.
3.15 Electrical Connections – Water Heaters
This section (3.15) applies only to water heaters. See Section 3.14 for boiler electrical
connections.
3.15.1 Storage Tank Connection - Water Heaters
This unit must be connected to a storage tank as follows:
Connecting the Water Heater to a Storage Tank
1. Connect the storage tank to the water heater as shown in Figures 3-16 or 3-17.
2. Remove the water heater front cover according to the instructions in Section 6.1.15.
3. Connect the leads of a two conductor cable (with a minimum cross section of #18 AWG) to
the thermostat and run the cable to the water heater electrical junction box.
4. Connect the thermostat cable leads to the “10” and “11” terminals as shown in Figure 3-22
or 3-23.
5. Access the Installer Menu (Section 5.4) and ensure that parameter 2003 is set to 0 (zero).
6. The storage tank pump must be connected to terminals “113” and “114” of the electrical
junction box (See Figure 3-22 or 3-23)
(a field supplied pump relay must be installed if the
pump current draw is greater than 3 amps).
7. Remove the header sensor connections from terminals “8” and “9” (Figure 3-22 or 3-23).
8. Connect the leads of a two conductor cable (with a minimum cross section of #18 AWG) to
the storage tank temperature sensor and run the cable to the water heater electrical junction
box.
9. The storage tank temperature sensor must be connected to terminals “8” and “9” (See
Figure 3-22 or 3-23). The sensor must be placed into the storage tank in a way that can
detect the water temperature (Follow the storage tank manufacturer’s instructions).
10. Refer to Section 4.4 for how to set the desired storage tank temperature.
NOTE
The maximum cable length permitted is 32 feet (10 meters). For
longer lengths, up to 300 feet (100 meters), a shielded cable with
the shield connected to the ground must be used.