Warning, Outdoor temperature sensor installation, Line voltage electrical connections – Steffes 8188 User Manual
Page 20
OUTDOOR TEMPERATURE SENSOR INSTALLATION
An outdoor temperature sensor, shipped in the electrical compartment, is required to be installed with the system.
This sensor monitors outdoor temperature and provides this information to the system. The system responds by
automatically storing heat in its brick core(s) according to the outdoor temperature and the heating requirements.
The outdoor temperature sensor can be installed in one of two ways: direct wired to the system or wired to the
Steffes power line carrier system. All 208/240V systems are factory configured for automatic charge
control with a direct wired outdoor sensor.
If connecting to the Steffes power line carrier (PLC) system, follow the installation instruc-
tions in the PLC system's Owner's and Installer's Guide.
Outdoor sensor wire MUST NEVER be combined with other control wiring in a multi-
conductor cable.
INSTALLING THE OUTDOOR SENSOR
Step 1
The outdoor sensor must be placed in a location where it can accurately sense outdoor temperature
and is not affected by direct sunlight or other abnormal temperature conditions. Select a location and
mount the sensor.
Step 2
Route low voltage wire from the outdoor sensor to the electrical compartment through one of the low
voltage wire knockouts.
• If the sensor wiring is routed through an external wall, the opening through which the wire
is routed MUST be sealed. Failure to do so may affect the accuracy of the outdoor
temperature sensor.
• The outdoor sensor is supplied with a lead length of 40 ft. If a greater wire length is
needed, it can be extended to a total of 250 ft. No other loads can be controlled or sup-
plied through this cable. It is for connection of the outdoor sensor ONLY. This low voltage
cable should not enter any line voltage enclosure.
•
Unshielded Class II (thermostat) wire can be used as extension wire provided it is segre-
gated from any line voltage cabling.
Installation
LINE VOLTAGE ELECTRICAL CONNECTIONS
To determine the correct wire size required for the circuit feeding the
system, refer to the Specifications (Page A.01-A.03) and the system's
identification label located on the front of the electrical panel (Figure 17).
Step 1 Remove the electrical panel cover.
Step 2 Route all line voltage wires through a knockout and into the
electrical panel.
Step 3 Make line voltage connections (See Page 3.10) to lugs of single
feed bus and ground lug. Refer to the Line Voltage Wiring
Diagrams (Pages A.04 - A.05) for more information on these
connections.
SAMPLE SYSTEM IDENTIFICATION LABEL
FIGURE 17
HAZARDOUS VOLTAGE: Risk of
electric shock, injury or death.
Do not energize the system
until installation is complete.
Equipment MUST be installed
by a qualified technician in
accordance with all applicable
local, state, and national codes
and regulations.
Risk of equipment damage,
personal injury or fire. Do NOT
install any wiring in line
voltage compartment unless
rated for line voltage. To
ensure proper operation and
safety, all wiring in the line
voltage compartment MUST be
rated for line voltage.
WARNING
I
NSTALLATION
3.11
T
HERM
E
LECT
Use copper or aluminum conductors rated at
75
o
C or higher for line voltage field connection
of this device.