AM Series Boilers and Water Heaters
CHAPTER 5: INSTALLATION - ELECTRICAL
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52
of
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AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0100_0D
03/28/16
Ph.: 800-526-0288
GF-146
5.2.4 Indirect Water Heater Priority Selection - Boilers
The boiler is factory set for DHW priority. This means that the boiler will stay in DHW mode until
the capacity of the indirect water heater reaches temperature. Once the indirect water heater is
satisfied the boiler will automatically return to central heating.
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 9.16).
•
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.
5.3 Electrical Connections – Water Heaters Only
5.3.1 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 Figure 4-7.
2. Remove the water heater front cover according to the instructions in Section 10.14.
3. If using an aquastat, connect the leads of a two conductor cable (with a minimum cross
section of #18 AWG) to the aquastat and run the cable to the water heater electrical junction
box.
4. Connect the aquastat cable leads to the “10” and “11” terminals as shown in Figure 5-5.
5. Access the Installer Menu (Section 9.16) 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 5-3
) (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 5-5).
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 5-5). 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 9.14 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.
5.4 AMR Rapid Recovery Option Wiring
If installing an AM water heater with the AM Rapid Recovery (AMR) option, the following
electrical connections should be confirmed in addition to all connections previously described.
Refer to Section 2.4 for a description of the AMR option. The recirculation pump, pump relay,
and LWCO are prewired into the AM water heater wiring terminals, as shown in Figure 5-6.
