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