EcoNet UETST800SYS Guide D'utilisation page 25

Wiring Considerations
Ordinary thermostat wire is recommended. Use 18 AWG or larger for normal wiring applications. Wire should be
free from defects such as wear, cracks or anything that would hinder the conductivity of the wire within the circuit.
Note: Wiring only requires four wires. However, it is good practice to run thermostat cable having more than four wires in the event of a
damaged or broken wire during installation.
The units should be wired in a "daisy chain" and not in a "star" configuration. To "daisy chain" the units on the
network, each unit should have a set of wires coming into it and one set going out of it except the two communicating
devices that are at the ends of the network. The devices on the ends should have only one set of wires to it. The order
of the devices in the network is not specified except the EcoNet Smart Thermostat should be at one end of the network.
The EcoNet Smart Thermostat has a six-terminal connector labeled R, C, E1, E2, S1 and S2.
Terminal Function
R Power – 24 VAC
C Common / Ground – 24 VAC
E1 EcoNet Communications Bus Wire 1
E2 EcoNet Communications Bus Wire 2
S1 (optional) Analog Remote Temperature Sensor Input
S2 (optional) Common/Ground - 24 VAC
RJ25
PD415187
Example of Smart Thermostat connection with HVAC and Water Heater unit. Please note this is an example only, and
the ordering network can change as long as it is daisy chained.
Electrical Specifications
• Input Voltage ............ 22 VAC to 26 VAC (24 VAC typical)
• AC Line Frequency ... 50/60 Hz
• WiFi........................802.11 b/g/n 2.4 GHz
(OPTIONAL) Shielded Wire
If the thermostat wiring will be located near or in parallel with high voltage wiring, cable TV, Ethernet wiring or radio-
frequency equipment, then shielded thermostat wire can be used to reduce or eliminate potential interference. The
shield wire should be connected to the C terminal, or ground, at the indoor unit only. The
shield wire from all of the thermostat runs should be attached together and only grounded at the indoor unit.
The shield wire should NOT be connected to any terminal at the smart thermostat. Connecting the shield to ground at
more than one location can cause current loops in the shield, reducing shield effectiveness.
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R
R
E1
E1
E2
E2
C
C
OUTDOOR UNIT
R
E1
E2
C
INDOOR UNIT
SMART THERMOSTAT
EcoNet Smart Thermostat User Guide
®
R C S1 S2 E1 E2
S1
S2
ECONET OPTIONAL REMO
TEMPERATURE SEN
25