Section 6: Standalone Modes Of Operation; Outdoor Reset Mode; Outdoor Air Temperature Sensor Installation - Watts AERCO Benchmark BMK5000 Operation And Service Manual

Benchmark Platinum-Edge [ii]: Operation-Service 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. 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. 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 RESET MODE

The Outdoor Reset mode of operation 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.

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 I/O board strip J3, terminals 1 (labeled
Outside Temp +) and 2 (Outside Temp –). Use shielded 18 to 22 AWG wire for connections.
For additional information on wiring see to Section 2.11.1: I/O Board Connections in the
Benchmark Platinum-Edge: INSTALLATION Manual (GF-210).
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