Aerco MODULEX EXT 321 - Reversing Flow & Return Temperature Sensors; Reversing Boiler Sensor Kf and Automatic Air Vent

MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
OMM-0087_0F AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 35 of 146
GF-143 Phone: 800-526-0288 07/13/15
3.8.3.2 Reversing Flow & Return Temperature Sensors
One sensor is located on top of the lower Return pipe railing, while the other one is located
under the upper Flow pipe railing. Move these two sensors to other end of Flow/Return
pipes.
Figure 3-12: Reversing Flow and Return Temperature Sensors
3.8.3.3 Reversing Boiler Sensor Kf And Automatic Air Vent
Reverse the positions of the Boiler Sensor KF and Automatic Air Vent located on the top
Flow pipe.
Figure 3-13: Reversing Boiler Sensor KF with Automatic Air Vent
NOTE
When reversing hydraulic and gas pipe connections, you must
close up the chassis openings vacated after the change. See
Figure 3-14.
Sensor Cable Plugged
into Sensor
Sensor cable unplugged
showing sensor, sensor
bracket, and screw
C.H. Flow Sensor is installed same as
Return Sensor, except under Return
pipe.