Constant Setpoint Mode; Remote Setpoint Mode - Watts AERCO Benchmark OMM-0136 Operation And Service Manual

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – MODES OF OPERATION

6.2 CONSTANT SETPOINT MODE

The Constant Setpoint mode (the default) is used when a fixed header temperature is desired.
Common uses of this mode of operation include water source heat pump loops, and indirect
heat exchangers for potable hot water systems or processes.
No external sensors are required to operate in this mode. While it is necessary to set the
desired setpoint temperature, it is not necessary to change any other temperature-related
functions. The unit is factory preset with settings that work well in most applications. Prior to
changing any temperature-related parameters, other than the setpoint, it is suggested that an
AERCO representative be contacted.
The setpoint temperature of the unit is adjustable from 40°F to 245°F (4.4°C to 118.3°C).
To set the unit to Constant Setpoint mode:
Constant 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 Constant Setpt.
4. Press SH Setpoint and choose the desired setpoint.

6.3 REMOTE SETPOINT MODE

The unit's setpoint can be remotely controlled by an Energy Management System (EMS) or
Building Automation System (BAS). The Remote Setpoint can be driven by a current or voltage
signal.
NOTE:
See Section 2.11.1: Remote Setpoint Field Wiring in the Benchmark Platinum-Edge:
INSTALLATION Manual (GF-210) for field wiring instructions.
When using the Remote Setpoint mode default setting, 4 - 20 mA/1 - 5 VDC, a 4 to 20 mA/1 to
5 VDC signal, sent by an EMS or BAS, is used to change the unit's setpoint. The 4 mA/1V
signal is equal to Setpoint Low Limit, while a 20 mA /5V signal is equal to a Setpoint High Limit
setpoint. When a 0 to 20 mA/0 to 5 VDC signal is used, 0 mA is equal to Setpoint Low Limit.
In addition to the current and voltage signals described above, the Remote Setpoint mode can
also be driven by a RS-485 Modbus Network signal from an EMS or BAS.
The Remote Setpoint mode of operation can be used to drive single as well as 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 PMC Board located in the Edge Controller. Contact your local
AERCO representative for details.
OMM-0137_E • GF-211 •
12/13/2019
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