EcoNet
®
Smart Thermostat User Guide
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
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.
PD415187
QUICK S
TART
GUIDE
E1
E2
C
R
R
E1
E2
S1
S2
C
R
E1
E2
C
OUTDOOR UNIT
INDOOR UNIT
OPTIONAL REMOTE
TEMPERATURE SENSOR
ECONET
SMART THERMOSTAT
R C S1 S2 E1 E2
RJ25
