Aerco Control System (Acs) - Watts AERCO Benchmark OMM-0136 Operation And Service Manual

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – MODES OF OPERATION
Direct Drive Mode Setup Instructions
3. Press SH Operating Mode parameter and choose Direct Drive.
4. The Remote Signal parameter now appears. It can be set to one of the options below.
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4-20mA/1-5V
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BST (PWM) Input
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BAS
5. If Network was selected in the previous step, the Unit Address parameter appears. Enter
a valid Comm address in this parameter.
Refer to Modbus Communication Manual (OMM-0035, GF-114) for additional information.

6.5 AERCO CONTROL SYSTEM (ACS)

NOTE:
ACS is for installations with between 17 and 32 boilers. It utilizes only RS-485 signaling to the
boiler. For installations with 1 to 16 boilers Boiler Sequencing Technology (BST) is
recommended. See Section 7: Boiler Sequencing Technology.
The ACS mode of operation is used in conjunction with an AERCO Control System. The ACS
mode is used when it is desired to operate multiple units in the most efficient manner possible.
For this mode of operation, an ACS Header Temp Sensor must be installed between 2 and 10
feet (0.61 and 3m) downstream of the last boiler in the boiler plant's supply water header.
ACS can control up to 32 boilers via Modbus (RS-485) network communication.
For ACS programming, operation, and Header Temp Sensor installation details, see the ACS
Operations Guide (OMM-081, GF-131). For operation via an RS-485 Modbus network, refer to
Modbus Communication Manual (OMM-0035, GF-114).
To enable the ACS mode:
ACS Mode Setup Instructions
1. As a prerequisite, verify that the unit is not a BST Client or Manager. Go to: Main Menu
→ Advanced Setup → BST Cascade → Cascade Configuration, Unit Mode = Off.
2. On the Controller, go to: Main Menu → Advanced Setup → Unit →Application
Configuration.
3. Press SH Operating Mode parameter and choose Direct Drive.
4. Press the Remote Signal parameter and choose Network.
5. Press the Baud Rate parameter and choose 9600.
NOTE:
See Section 2.11.1 in the Benchmark Platinum-Edge: INSTALLATION Manual (GF-210) for
field wiring instructions.
OMM-0137_E • GF-211 •
12/13/2019
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0-20mA/0-5V
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Network
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