MC2: 10/03/12 Page 31 of 90
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
6.2 DHW (Domestic Hot Water) Storage Tank
Domestic hot water (DHW) production by an external storage tank connected to the boiler can be
implemented by an electric diverting valve or a separated storage tank loading pump. See Figure 6-2
and 6-3. Contact AERCO for information on AERCO tanks designed for this purpose.
To monitor the DHW temperature, connect the aquastat wire leads to Connector KF/SPF, Terminals 6
(F6) and 7 (GND). After the sensor is connected, turn the ON/OFF switch to the OFF position, then back
to the ON position. This is necessary to ensure that the Controller recognizes the added sensor.
A map of the connection points on the rear of the E8 Controller may be found in the E8 Controller
manual, Section 6 of GF-115-C.
6.3 Enable / Disable
Enable/Disable should be connected to terminals 3 (F3) and 4 (GND) of E8 connector number I.
6.4 Installation Of Sensors
To avoid electromagnetic interference, it is necessary to separate any external sensor wiring (between
sensor and terminal strip) from any 120 VAC power wiring.
WARNING!
There is a 120 VAC between terminals A10 and N whenever the E8
boiler controller is on.
Figure 6-2: Electrical Pump Connection for Primary Boiler
WARNING!
There is a 120 VAC between terminals A3 and N when there is a heating
demand by the DHW NTC sensor or by a DHW thermostat.
Figure 6-3: Electrical Pump Connection of a DHW Tank Loading Pump
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