Section 6. Standalone Modes Of Operation; Outdoor Air Reset Mode; Outdoor Air Temperature Sensor Installation - Watts Aerco Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
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.
Main Menu → Advanced Setup
To verify that the unit is not a BST Client or Manager, go to:
→ BST Cascade → Cascade
Configuration, then verify that Unit Mode = Off.
For instructions on configuring BST modes of operation, see Chapter 7: Boiler Sequencing
Technology, below
Benchmark standalone boilers are capable of being operated in any one of six different modes.
The following sections provide descriptions of each of these operating modes. Each boiler is
shipped from the factory tested and configured for the ordered mode of operation. All
temperature related parameters are at their 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 the
needs of the 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 Configuration.
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.

Outdoor Air Temperature Sensor Installation

6.1.1
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.
For additional information on wiring see to Section 2.11.1: Outdoor Air & Air Sensor Common in
the Benchmark 750-6000 with Edge [i]: Install-Startup Manual (OMM-0144, GF-217).
OMM-0145_D • GF-218 • Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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