Steffes 5140 Owner & Installers Manual - Manual (Page 17)

lINE VOlTAgE pEAk CONTrOl
Line voltage control is also an option, but is not the preferred method of control as it is usually more complex
and expensive. If line voltage control is utilized, the controls circuit must be powered with an uninterrupted
circuit. An external switching device, such as a relay panel, is necessary to directly control the heating element
charging circuits. If relying on this method of control, the faceplate on the system MUST continuously display
a brick core operating mode of “C” (charge) regardless of whether it is an off-peak or on-peak period. Refer to
C005 of the Configuration Menu for proper settings. (Reference Pages 3.14-3.15.)
loW voltaGe electrical connectionS - outDoor
teMPerature SenSor (reQuireD)
Installation Methods: A) Hard wired to system to the two
"Outdoor" terminals (default)
Or
B) Connected to Power Line Carrier
(PLC)
Theory of Operation: The outdoor sensor monitors outdoor
temperature and provides this informa-
tion to the system. The system responds by automatically storing heat in its brick core
according to outdoor temperature and the heating requirements.
location of: The outdoor sensor must be placed in a location where it can accurately sense outdoor tempera-
ture and is not affected by direct sunlight or other abnormal temperature conditions.
Wiring: • Route low voltage wire from the outdoor
sensor to the electrical compartment through
one of the low voltage wire knockouts.
• Connect to "Outdoor" terminals as shown in
Figures 13-14.
• 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 supplied through this cable. It is for connection of the
outdoor sensor ONLY.
• This low voltage cable MUST 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.
IMPORTANT
If connecting to the Steffes power line
carrier (PLC) system, follow the instal-
lation instructions in the PLC system's
Owner's and Installer's Guide.
Installation  3.07 Comfort Plus Hydronic Comfort Plus Hydronic Installation  3.08
IMPORTANT
Outdoor sensor wire MUST NEVER be
combined with other control wiring in a
multi-conductor cable.