Outdoor Reset Mode Startup - Watts Aerco Benchmark Series Operation And Service Manual

Benchmark Platinum-Edge: 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:
A design engineer typically provides outdoor air temperature and supply header temperature
data.
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).
Figure 6-1: Application Configuration Screen
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_D • GF-211 • 7/16/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 74 of 146