Direct Drive Modes - Watts AERCO Benchmark OMM-0136 Operation And Service Manual

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – MODES OF OPERATION
To set the unit to Remote Setpoint mode:
Remote Setpoint 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 and choose Remote Setpt.
4. Set the Remote Setpoint parameter to one of the following:
•
4-20mA/1-5V
•
BST (PWM) Input
•
BAS
If the Network setting is selected for RS-485 Modbus operation, a valid Comm Address must
be entered in the Setup menu. Refer to the Modbus Communication Manual (OMM-0035, GF-
114) for additional information.
While it is possible to change the values of temperature related functions, the unit is factory
preset with values that work well in most applications. It is suggested that an AERCO
representative be contacted, prior to changing any temperature related function values.

6.4 DIRECT DRIVE MODES

The unit's air/fuel valve position (% open) can be changed by a remote signal which is typically
sent from an Energy Management System (EMS) or from a Building Automation System (BAS).
The Direct Drive mode can be driven by a current or voltage signal.
The default setting for the Direct Drive mode is 4-20 mA/1-5 VDC. With this setting, a 4 to 20
mA signal, sent by an EMS or BAS is used to change the unit's valve position from 0% to 100%.
A 4 mA/1V signal is equal to a 0% valve position, while a 20 mA /5V signal is equal to a 100%
valve position. When a 0-20 mA/0-5 VDC signal is used, zero is equal to a 0% valve position.
In addition to the current and voltage signals described above, the Direct Drive mode can also
be driven by a RS-485 Modbus Network signal from an EMS or BAS. When in Direct Drive
mode, the unit is a slave to the EMS or BAS and does not have a role in temperature control.
Direct Drive can be used to drive single, or multiple units.
NOTE:
If a voltage, rather than current signal is used to control the remote setpoint, a DIP switch
adjustment must be made on the CPU Board located in the Edge Controller. Contact your local
AERCO representative for details.
To enable the Direct Drive mode:
Direct Drive 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.
OMM-0137_E • GF-211 •
12/13/2019
•
0-20mA/0-5V
•
Network
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