06/05/13 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526- 0288 Page 55 of 112
Modulex E8 Controller and BCM
Operations and Maintenance Manual
5.4.4 Displaying Temperatures Associated With DHW
Functions in the DISPLAY menu are used to display the actual DHW temperature measured by
the tank sensor. The swing-down hinged panel must be open to access and display these
functions.
5.4.4.1 Viewing DHW Set Point and Actual DHW Temperature
The DHW set point and the actual DHW temperature measured by the tank sensor are
displayed as shown in the instructions below.
Viewing DHW Setpoint and Actual DHW Temperature
1. Turn the Rotary Knob to the DISPLAY menu. The first sub-menu displayed will be
INSTALLATION.
2. Continue turning the Rotary Knob clockwise until the HOT WATER sub-menu is displayed.
3. Press the Program Key to enter the HOT WATER sub-menu.
4. Turn Rotary Knob to display T-DHW RATED. The temperature value shown is the DHW
set point temperature.
5. Next, scroll to T-DHW. The temperature value shown is the actual DHW temperature
measured by the tank sensor.
6. Continue scrolling until RETURN is displayed. Press the Program Key to exit the HOT
WATER sub-menu.
5.4.4.2 Viewing DHW Set Point With T-BOILER DHW Function
The setting for T-BOILER DHW, in the EXPERT/HOT WATER Menu, adds to the Domestic Hot
Water setpoint (T-DHW RATED), becoming the final supply water temperature to the domestic
hot water tank. The T-COLL DES reading equals the DHW setpoint plus the value of the T-
BOILER DHW function or T-DHW RATED + T-BOILER DHW = T-COLL DES.
EXAMPLE: If T-DHW RATED is set at 140° and T-BOILER DHW is set at 45°,
then the T-COLL DES (Boiler Outlet Temperature) will be 185°.
To view DHW set point with the T-BOILER DHW setting already added to it, refer to the
instruction below.
Viewing DHW Setpoint with T-BOILER DHW Function
1. Turn the Rotary Knob to the DISPLAY menu. The first sub-menu displayed will be
INSTALLATION.
2. Press the Program Key to enter the INSTALLATION sub-menu.
3. Turn the Rotary Knob clockwise until T-COLL DES is displayed along with corresponding
temperature reading.
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