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SECTION 6 STANDALONE MODES OF OPERATION
SECTION 6. STANDALONE MODES OF OPERATION
The descriptions and instructions in this chapter apply to Standalone units only; the unit cannot be a
BST Client or BST Manager.
To verify that the unit is not a BST Client or Manager, go
Cascade → Cascade
For instructions on configuring BST modes of operation, see Chapter 7: Boiler Sequencing Technology.
CFR standalone boilers can be operated in six different modes. Each boiler is shipped from the factory
tested and configured for the ordered mode of operation. All temperature-related parameters are at
factory default values, which work well in most applications. However, it may be necessary to change
certain parameters to customize the unit to the system environment. After reading this section,
parameters can be customized to suit a specific application.
6.1 Outdoor Air Reset Mode
The Outdoor Air Reset operating mode is based on outside air temperatures. As the outside air
temperature decreases, the supply header temperature will increase and vice versa. For this mode, it is
necessary to install an outside air sensor.
To enable this operating mode:
Main Menu → Advanced Setup → Unit → Unit Application
1. Go to
2. Set the Unit Application parameter to SH.
3. Set the Unit SH Operating Mode parameter to Outdoor Reset.
4. Set the Outdoor Air Temp Sens parameter to Network, Direct or BAS.
6.1.1 Outdoor Air Temperature Sensor Installation
The outdoor air temperature sensor must be mounted on the North side of the building in an area
where the average outside air temperature is expected. The sensor must be shielded from the sun's
direct rays, as well as direct impingement by the elements. If a cover or shield is used, it must allow free
air circulation. The sensor may be mounted up to 200 feet (61m) from the unit. connections are made
at the Input/Output (I/O) Box on the front of the boiler.
The Outdoor Air Temp Sensor must be connected to the OUTDOOR AIR and AIR SENSOR COMMON
terminals on the I/O board. Use shielded 18 to 22 AWG wire for connections.
6.1.2 Outdoor Reset Mode Setup
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.
Main Menu → Advanced Setup → Unit → Application
1.
Go to:
2. Press the Unit Application parameter and choose SH.
3. In the Unit SH Operating Mode parameter, choose Outdoor Reset. These parameters will create a
temperature curve to vary the active setpoint depending on the Outside Air Temperature (OAT).
•
Configuration, then verify that Unit Mode = Off.
•
Main Menu → Advanced Setup → BST
to:
Configuration.
Configuration.
•
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