Page 1 of 5 Specifications subject to change without notice Nordic Technology Ltd www.fast-stat.com
Relay
coil
Relay
coil
Yellow Green
Red Black
Application
The FAST-STAT Model 1000 is designed to add additional control
wiring between the thermostat and indoor unit or between the
indoor unit and outdoor unit.
Before Installing This Product
1. Read Instructions. If you ha e any questions please contact
our tech support line
2. This product is designed for use only on 24- olt AC circuits
supplied by a Class 2 transformer.
3. This product is only to be installed by qualified technicians.
4. To a oid risk of electrical shock or equipment damage,
disconnect power before beginning installation.
Sender Installation
When used to add wiring between the thermostat and indoor
unit, the sender is installed in the wall space behind the
thermostat. Enlarge the opening around the thermostat cable so
that the sender can be inserted into the wall ca ity. Once the
connections to the cable and thermostat are completed, insert
the sender into the wall ca ity. The sender hangs by its leads and
does not require any mounting.
When used to extend wiring between the indoor and outdoor
units, the sender is connected to the indoor unit terminal strip
or leads. It then hangs from the terminal strip or is grouped
together with the other leads.
Receiver Installation
The recei er module is normally mounted inside the cabinet of
the indoor or outdoor unit near the other controls. If there is no
space inside the cabinet, the module may be located in any dry
location without exposure to high temperatures or water.
Wiring
1. See included Installation Guides for your application.
2. The power supply must be between 20 to 30 olts for
proper operation. The total connected load must not
exceed 2 amps. The connected load cannot operate at a
oltage of more than 30 olts (not intended for line oltage
control).
Sequence of Operation
The recei er has two normally-open relays, one for the yellow
wire and one for the green wire. One side of each relay contact
is connected to red wire which is then connected to the
transformer “R” terminal. When either or both relays are
energized it will connect its load to the transformer “R” terminal.
The power for the relay coils tra els
through the purple and black wires.
The load side of the relays is not
connected to the coil side. This
pro ides electrical isolation when
two transformers are used on the
same control circuit.
Troubleshooting – not operating
1. Check that there is 24 olts between the recei er red and
black wires.
2. Check that the sender purple and recei er purple wires are
connected together.
3. At the recei er, jumper the recei er purple wire to the
transformer “R” connection. Both relays in the recei er
should energize and switch on their connected loads. If the
connected loads do not start, then measure the oltage from
the recei er green wire to the transformer common. There
should be a reading of 24 olts AC. Measure the oltage from
the recei er yellow wire to common as well. If there is
oltage at the yellow and green wires but the loads do not
start, then check the wiring of the connected loads. If the
recei er relays cannot be made to energize by this test, then
the recei er may be defecti e.
4. If test #3 works OK but it doesn’t operate when connected to
the sender, jumper the transformer power “R” to the sender
purple wire (at the sender). This should cause a 24 olt
output on the recei er green & yellow wires (same as test
#3). If the recei er relays do not energize during this test,
then there is a problem with the cable that connects the
recei er and the sender together.
5. If test #4 works OK but it doesn’t operate when connected to
the sender, then jumper transformer power “R” to the
sender green wire. This should cause the load connected to
the recei er green wire to start. Do this test for the sender
yellow wire as well. If this test fails for either the green or
yellow wires, then the sender may be defecti e. If this works
then the FAST-STAT and the field wiring is OK. The problem
may be a compatibility issue with the thermostat.
Troubleshooting – 2 stage air conditioner
In some installations the indoor unit fan may operate in high
speed when the outdoor unit is running in low speed. This is
caused by the sender ha ing a 12 olt DC oltage on the indoor
unit Y2 terminal. Some furnaces or air handlers mistake this 12
olts DC for 24 olts AC and switch the fan into high speed. Add
an isolation relay as follows:
Tech Support Line: 1-800-775-4750 ext. 3
Monday – Friday: 8:30am to 4:30pm (Pacific Standard Time)
FAST-STAT Model 1000 Installation Instructions
Purple Yellow
Green
Sender
C
R
Y1 Y2
Relay
coil
