The ESM™ is a system of micro-computer digital optimization modules specifically designed to reduce the electricity consumption (kWh) and maximum demand (KW) of refrigeration and air conditioning compressors by 15% to 20% while maintaining temperature performance.

The ESM™ is designed to interface with all types and makes of air conditioning and refrigeration controllers from the simple thermostat single condensing systems to the most sophisticated computer based multiple compressor parallel systems. The ESM utilizes world wide exclusively copyrighted software that has been developed over 20 years to augment existing building and refrigeration control systems.

The major function of the ESM™ is to optimize the performance of air conditioning and refrigeration compressors while operating within the control parameters of the existing primary controller.

In addition to its exceptional energy saving capabilities, the ESM™ has several other attributes:

• The ESM™ reduces compressor run time by 15% - 50% and in so doing extends compressor life. Therefore the ESM™ provides cost reductions to both operating and capital budgets.

• Using the ESM™ restricts "short cycling" and ensures warranty compliance by controlling the off time of the compressor. The ESM™ is installed in the control circuit in series with and after the thermostat. Because the ESM™ is no more invasive than a thermostat there are no issues with the compressor's warranty.

• Because the ESM™ complements, but does not replace the primary controls, an accurate evaluation of the ESM performance can be measured at any time after installation of the ESM™ by switching the ESM™ off and comparing the kWh consumption with a similar period with the ESM™ operating. This is critical to qualifying for any of the government or utility rebate programs.

• Installation is relatively easy and can be carried out by an Authorized Smartcool Controller normally in less than a day for each system required at the site. The ESM's™ are connected in the control circuit in series with the existing compressor controls.

Network Controller (LNC)

The Network Controller (LNC) contains the Central Processor Unit that provides control for a maximum of eight channels through four, two channel System Interface Modules (SIM). Within a global system one Network Controller is designated as the Global Network Controller (GNC) undertaking the task of managing communication through the RS485 network and also any external communication via aRS232 port.

The Network Controller has three analogue and two external digital inputs that can be configured for temperature or suction pressure measurement. The values of these two inputs determine the degree of compressor optimization that can be applied to the Local Network.

The Network Controller controls the switching and communication functions of the local network. The local network will always consist of one Network Controller and at least one SIM. The keypad on the Network Controller enables configuration of the local network, access to data and bypass selection. The relevant data and information are shown on the display.

In a Global System the selection of the Global or Local control duty of the Network Controller is also achieved through the keypad.

The keypad on the Network Controller enables access to ten menu items:

Channel Input / Output Status Multiplex or Simplex Modes Refrigeration or Air Conditioning Modes Analogue Interface Values Set Points

Bypass Time Out Selection Channel Bypass On / Off Total Network Override On / Off Performance Data Communication Settings

Selecting "Multiplex" mode enables the Network Controller to manage a maximum of eight parallel connected compressors. Selecting Simplex mode enables the management of up to eight independent cooling loads.

The Energy Saving Module System™ is designed to be "fail safe". In the unlikely event of a system fault each input/output channel will automatically bypass to ensure continuous operation of the air conditioning and refrigeration equipment. Sets of normally open, voltage free alarm contacts provide remote indication of a system override or channel bypass.

System Interface Module (SIM)

The SIM is connected in series with the air conditioning or refrigeration control circuit to directly control the compressor operation. Each SIM has two electrically separate, independent channels with normally open and normally closed switching.

A 24 pin male connector on each side of the SIM enables direct, side-by-side connection to the Network Controller and other SIM's.

Each channel has a provision for an external override, which can be activated by any type of external switching device such as a thermostat or pressure switch.

LED indicators show the status of the input, output and bypass:

LED Status	Indicates
Green LED Flashing Green LED Constant On Green LED Off Red LED Flashing Red LED Constant On Red LED Off	Run Mode Input On - Output On Save Mode Input On - Output Off No Demand Input On - Output Off Channel bypassed through external override switch Channel bypassed through Network Controller keypad Bypass and Override Off