Instructions / Assembly

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● The Common Maker provides a common connection
‘C’ for Wi-Fi and powered thermostats.
● A common connection allows the thermostat to
operate without batteries or “power stealing” circuits.
● The Common Maker is compatible with all 24VAC
heating and cooling systems.
1. Check that the thermostat will power on.
2. Use the thermostat to turn on the heating system, and
ensure that the heating system turns on.
3. Use the thermostat to turn off the heating system, and
ensure that the heating system turns off.
1. Measure the transformer voltage to ensure it is
between 23-28VAC. If it is outside this range the
Common Maker may not work as intended.
2. If the thermostat has power but the Common Maker
will not activate the equipment, try reversing the wires
in the thermostat cable.
3. At the thermostat base, place a jumper wire between
the ‘R’ and ‘W’ terminals. This should cause the heating
system to start. If the heating system does not start,
the thermostat cable or Common Maker may be faulty.
4. Disconnect the Sender and bring it to the location of
the Receiver. While keeping the Receiver connected
to the equipment, connect the Sender and Receiver
purple wires together. Then apply 24VAC to the
Sender white wire. The relay in the Receiver should
energize. If the relay does not energize, the Common
Maker may be faulty.
● This product should only be installed by a qualified
technician.
● Requires a Class 2 transformer providing 23-28VAC.
● The total connected load must not exceed 2 amps.
● The connected load cannot operate at more than
30VAC (not designed for direct connection to 120VAC
equipment).
● To avoid risk of electrical shock or equipment damage,
disconnect power before beginning installation.
The Sender is the smaller component and has purple,
white, and black wires. It is installed inside the wall behind
the thermostat.
The Receiver is the larger component and has purple,
white, black, and red wires. It is installed near the furnace,
boiler, air handler, zone valve, or zone controller. It should
be placed in the equipment cabinet or a location without
exposure to liquids or high temperatures.
Follow the relevant wiring diagram for your system (pages
2-4) and connect the wires accordingly. Additional wiring
diagrams may be found at www.fast-stat.com.
Note: The Sender will produce a small amount of heat
while operating. Keep the Sender wires as long as possible
to maximize the distance between the Sender and
thermostat. Do not install the Sender in insulated walls.
1. Remove the thermostat from its base.
2. The thermostat base will have wires running into the
wall through a small hole. If this hole is not big enough
to fit the Sender, enlarge the hole.
3. Find the wiring diagram for your system (pages 2-4)
and connect the wires accordingly.
4. Place the Sender in the wall. It will hang by its wires
and does not require any mounting.
5. Place the thermostat back on its base.
Overview
Testing
Troubleshooting
Internal Wiring
Standard
Incorrect
Dry-Contact
Correct
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Electrical Safety
Sender Installation
Receiver Installation
After the Common Maker has been installed, check to see
if it is functioning properly by following these steps:
When the Sender has 24VAC applied to its white wire, it
will energize the relay in the Receiver, and complete the
circuit between the Receiver red and white wires. In most
installations, this will connect the ‘R’ and ‘W’ terminals on
the furnace.
For installation assistance, our technical support line can
be reached at 1-800-775-4750, 9am-5pm PST, or emailed
at [e-mail]
The Common Maker also supports dry-contact switching.
In this configuration, the two ‘T’ terminals are electrically
isolated from the thermostat transformer.
Common Maker
Installation Instructions
T
To Sender
RELAY
T
C
R
To Sender
RELAY
W
C
Thermostat
R C
W
Thermostat
Cable
R C
W
Furnace
Common
Maker
Thermostat
R C
W
Thermostat
Cable
R C
W
Furnace
Common
Maker