AERCO Control System (ACS)
CHAPTER 2
: ACS Installation
11/22/2017
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
Page 19 of 139
OMM-0081_0F
Phone: 800-526-0288
GF-131
2.5.1 Header Sensor Installation
A Header Sensor Kit, (P/N 122790) is provided with the ACS. This Kit contains the Header
Sensor (P/N 64038), a thermowell (P/N 122758) and some heat conductive grease which MUST
be used with the Sensor. When installing the Sensor, use a 1/2 inch NPT tapped coupling or a 4
x 4 x 1/2 inch Tee fitting. Shielded pair, 18 AWG cable (Belden # 8760 or equiv.) is
recommended for Header Sensor wiring. The Header Sensor must be installed between 2 and
10 feet downstream of the LAST boiler in the boiler plant’s supply water header. Install the
Header Sensor as shown below:
NOTE
The Header Sensor is a thermistor type sensor. The Resistance vs.
Temperature Chart for this sensor is provided in Appendix D. Length
of Header Sensor wire leads should not exceed 600 feet.
Installing the Header Sensor
1.
Refer to Figure 2-3 for the Header Sensor installation details.
2.
Install the Header Sensor and Thermowell into the 1/2 inch NPT tapped coupling or a 4 x 4
x 1/2 inch Tee fitting using heat-conductive grease provided. This will aid in its response.
3.
For proper response, ensure that the Header Sensor probe is inserted at least 2 inches into
the water flow.
4.
Using shielded pair cable (Belden #8760 or equiv.) connect the Header Sensor leads to
HDR SEN terminals 4 and 5 on the ACS. There is no polarity to observe when making
these connections.
5.
Terminate the cable shield at SHLD terminal 3 of the ACS. DO NOT terminate the shield at
the Sensor end of the cable.
2.5.2 Return Sensor Installation
The Return Sensor is required to activate the Plant Delta Temperature function, as described in
section 3.9.14, on page 54.
As mentioned in paragraph 2.5, the Return Sensor is identical to the Header Sensor. Therefore,
if a Return Sensor is being installed, another Header Sensor Kit (P/N 122790) is required. The
Return Sensor should be installed in the boiler water return line within 3 feet of the first boiler in
the boiler plant’s return water line. The installation details shown in Figure 2-3 for the Header
Sensor also apply to the Return Sensor. If used, install the Return Sensor as shown below:
Installing the Return Sensor
1.
Refer to Figure 2-3 and install the Return Sensor and Thermowell into the 1/2 inch tapped
coupling or Tee fitting using heat conductive grease.
2.
Using shielded pair cable (Belden #8760 or equiv.), connect Return Sensor leads to
terminals 6 and 5 on the ACS. There is no polarity to observe when making these
connections.
3.
Terminate the cable shield at SHLD terminal 3 of the ACS. DO NOT terminate the shield at
the Sensor end of the cable.
