Steffes 8188 - Manual (Page 8)

Optional Accessories
2
LOAD MANAGEMENT CONTROL
The ThermElect is a commercial Electric Thermal Storage (ETS) heating system. It uses Demand Free, Off-Peak
electricity to provide a low cost heating solution for commercial, industrial, and large residential applications. ETS
equipment is designed to store electricity, as heat, during hours when energy costs are lower and kW demand
charges are not incurred. The ThermElect’s thermal mass consists of a high-density ceramic brick capable of vast
heat storage.
The ThermElect system is designed to operate under one of three different load management control strategies.
1. On-Peak/Off-Peak Program
a) The ThermElect system responds to heat calls during the on-peak and off-peak periods; however, only
consumes energy (energize heating elements) during the off-peak periods. The ThermElect system is
controlled by an external control device such as a meter or time clock module.
b) The ThermElect system also offers on-peak control of external loads by utilizing the dry contacts provided
on the relay driver board.
2. 4-20 Milliamp Control (1-5 volt DC)
a) The ThermElect system receives a signal from an external load control device such as a building load
management system. This external signal dictates to the ThermElect the maximum amount of energy
which can be consumed during a preset time interval.
b) Other external loads would generally be controlled through the building's
load management control system.
3. Pulse Monitoring
a) The ThermElect system monitors pulse outputs from the power company's
electric meter. Program parameters such as desired maximum building kW
and pulse ratios for the metering system being used are entered into the
ThermElect system. The system then changes proportionally when demand
free power is available. This keeps the total building kW usage at or below
the desired level.
b) External load management control modules (Order Item # 1908410) are
available when using pulse monitoring load control. Each module has eight
(8) zones which can be controlled. The ThermElect system must be
configured to recongnize the number of load management modules installed
(maximum of two per ThermElect system).
Reference the Load Management Section of this manual for more specific information on the individual methods
of control.
Optional Accessories
O PTIONAL A CCESSORIES
„
2.01 T HERM E LECT