Outdoor Reset Mode Startup - Watts AERCO Benchmark OMM-0136 Operation And Service Manual

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

6.1.2 Outdoor Reset Mode Startup

Startup in the Outdoor Reset mode is accomplished as follows:
NOTE:
It is required to have an outdoor sensor for the Outdoor reset. A header sensor or boiler supply
sensor can be used depending on the plant configuration.
Outdoor Reset 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. In the SH Operating Mode parameter, choose Outdoor Reset. The parameters that
appear will be used to create a temperature curve to vary the unit's active setpoint
depending on the Outside Air Temperature (OAT).
4. Set the following parameters to define the total outside air temperature span which will be
used for Setpoint control.
OAR Min Outside Temp: The minimum outside temperature the system can
•
read; it is tied to the OAR Max Setpoint. For example, if OAR Min Outside Temp is -
5°F and OAR Max Setpoint is 180°F, when the outside temperature is -5°F or below,
the system will supply 180°F.
OAR Max Outside Temp: Outdoor Air Reset Maximum Outside Temperature that
•
the system will operate to. For example: if set to 60°F, the boiler will operate between
60°F outside temperature and OAR Min Outside Temp setting.
5. Set the following parameters to define the Setpoint curve, which will be used to yield a
desired setpoint for a given outside temperature:
OAR Max Setpoint: The maximum allowable setpoint (range = Min Setpoint up to
•
210°F (98.9°C)).
OAR Min Setpoint: The minimum allowable setpoint (range = 40°F (4.4°C) up to
•
the Max Setpoint).
6. Set the Warm Weather Shutdown parameter to the threshold outside temperature
above which the unit shuts down. For example, if set to 65°F, when the outside
temperature goes above 65°F, the unit goes into standby. The unit will then restart when
temperature falls below 60°F.
OMM-0137_E • GF-211 •
12/13/2019
Figure 6-1: Application Configuration Screen
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