Steffes 8188 - Manual (Page 24)

L OAD M ANAGEMENT
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4.01 T HERM E LECT
LOAD MANAGEMENT
4
The ThermElect is a commercial Electric Thermal Storage (ETS) heating system. It is generally signaled to use
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.
ON-PEAK/OFF-PEAK PROGRAM
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 and also offers on-peak control of external loads by
utilizing the dry contacts provided on the relay driver board.
Never install any wiring in a line voltage compartment of the system unless it is rated for line
voltage.
The ThermElect system may be controlled by the Power Company via a peak control signal. This signal can be
sent to the equipment using low voltage wiring, a Steffes Time Clock Module, or a Steffes Power Line Carrier
control system (208 and 240V applications only). In applications utilizing automatic charge control, outdoor
temperature information is required and can be received via an outdoor sensor or power line carrier control
system.
The heating system is factory configured for low voltage wire control and is set to charge when the utility peak
control switch closes.
LOW VOLTAGE (DIRECT WIRED) PEAK CONTROL
If using the low voltage peak control option, the system is direct
wired to the power company's peak control switch. Field connec-
tions from the peak control switch are made to the low voltage
terminal block through a low voltage knockout located on the left
side of electrical panel.
Step 1 Route a low voltage circuit from the power company’s
load control or peak signaling device to the six (6)
position terminal block (Figure 20) inside the electrical
compartment.
Step 2 Connect the field wiring to positions "RP" and "P" on
the six (6) position low voltage terminal block. (See
Figure 20.)
6-Position Low Voltage Terminal Block Coding
RP = Peak Control Input Common
P = Peak Control Input
AP = Anticipated Peak (Pre-Peak) Control Input
COM = Peak Control Output Common
NC = Peak Control Output (Normally Closed)
NO = Peak Control Output (Normally Open)
PEAK CONTROL TERMINAL
CONNECTIONS
FIGURE 20
NC P RP COM AP NO
Dry Contact Peak
Control Switch
Load Management