Benchmark Platinum-Edge: Operation-Service Manual
SECTION 6 – MODES OF OPERATION
OMM-0137_D • GF-211
•
7/16/2019
Technical Support
•
(800) 526-0288
•
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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.
