YOLINK YS4003-UC Smart Thermostat User Guide
Add Your Thermostat to
the App
Installation, Continued.
Contact Us
I
H
G
THERMOSTAT
TERMINAL
TYPICAL WIRE
DESIGNATIONS
Note #1: Confirm the presence of a C
wire, or one labeled COM or COMMON.
The Thermostat will not function without
a C wire (or C wire adapter, as previously
noted).
We are here for you, if you ever need any
assistance installing, setting up or using
a YoLink app or product!
FUNCTION
NON-HEAT PUMP: PRIMARY COOLING
HEAT PUMP: COMPRESSOR ON/OFF CONTROL
FAN RELAY
REMARKS
1. Tap Add Device (if shown) or tap the
scanner icon:
TYPICALLY YELLOW
Y
Y
Need help? For fastest service, please
email us 24/7 at service@yosmart.com
Scanner icon
TYPICALLY GREEN
G
G
NON-HEAT PUMP: PRIMARY HEATING
HEAT PUMP: HEAT OR COOL MODE
EMERGENCY HEAT
TYPICALLY WHITE, ORG, BRN
ACCORDING TO O/B SETTING
W, O/B
Note #2: The Thermostat is not
compatible with multi-speed cooling,
two or second-stage cooling or heating
W
Or call us at 831-292-4831 (US phone
support hours: Monday - Friday, 9AM to
5PM Pacific)
W, O/B
AUX
C
AUX, or E
C or COM
2. Approve access to your phone’s
camera, if requested. A viewfinder will be
shown on the app.
Note #3: The Thermostat does not use
an outdoor temperature sensor. This is
an optional feature used for heat pump
lockout, based on outside temperature.
As there is no automatic lockout with the
Thermostat. To avoid possible
compressor damage, do not run the air
conditioner if outside temperatures are
below 50°F (10°C).
24VAC COMMON
TYPICALLY CYAN, SEE NOTE #1
TYPICALLY RED
You can also find additional support and
ways to contact us at:
24VAC POWER
R
R, RC, RH
MULTI-SPEED OR SECOND STAGE COOL
SEE NOTE #2
Y1, Y2
W2
SECOND STAGE HEAT
SEE NOTE #2
SEE NOTE #3
SEE NOTE #3
Or scan the QR code:
OUTSIDE AIR TEMPERATURE
OUTSIDE AIR TEMPERATURE
OAT
SRTN, OAT
RETURN
If your existing thermostat has additional wires that do not appear to correspond with any of these wire designations, please contact us.
1. Refer to the chart above, match up
your thermostat wires with their
matching screw terminal on the
Thermostat terminal strip.
6. Terminate each conductor on its
respective screw terminal. You will need
to loosen each screw terminal, first.
When finished, gently tug on each wire,
to ensure a good connection.
9. Gently push the thermostat down onto
the back plate. You may hear an audible
click, as it snaps into place. Observe the
rear thermostat sides, near the wall, to
ensure there are no uneven gaps
between the plate and the thermostat.
Gently tug on the thermostat, to ensure it
does not come loose.
Support
Home Page
3. Hold the phone over the QR code so
that the code appears in the viewfinder.If
successful, the Add Device screen will be
displayed.
Finally, if you have any feedback or
suggestions for us, please email us at
2. Turn off power, as required, to ensure
there are no energized wires at the
thermostat location.
7. Refer to the rear of the Thermostat.
Set the HP/GAS slide switch to HP for
heat pump systems otherwise to GAS
You can change the switch setting with a
small screwdriver, pencil or similar
object.
4. Follow the instructions to add your
Thermostat to the app.
Thank you for trusting YoLink!
3. Before making any changes to the
thermostat wiring, it is important to
identify the individual wires and their
functions using the supplied labels (or
masking tape, etc.) label each wire with
the same identifier that is on the existing
thermostat ("C", "R" etcetera). It may also
help to have a picture of the wiring on
the existing thermostat, in case a label
falls off or if you need to reinstall the
existing thermostat.
10. Turn on power to the unit. The
Thermostat display should immediately
turn on. If not, double-check your wire
terminations, power-off the unit and
correct any mistakes, as needed.
Eric Vanzo
Customer Experience Manager
8. If you set the HP/GAS switch to HP,
set the O/B slide switch to O for
energizing the reversing valve on heating
(cold climates) or B for energizing the
reversing valve on cooling (hot climates)
operation.
Installation
H
Refer to the full Installation & User Guide
and the product support page to
complete the setup of your Thermostat.
This installation manual assumes the
Thermostat is replacing an existing
thermostat. For new installations please
disregard references to the existing
thermostat, etc.
15375 Barranca Parkway
Ste. J-107 | Irvine, California 92618
If you set the HP/GAS switch to GAS, the
valve will only energize for heating.
4. Remove your existing thermostat and
back plate from the wall. Use care to not
allow the cable to fall into the hole in the
wall!
© 2023 YOSMART, INC IRVINE,
CALIFORNIA
CAUTION: To prevent personal injury and
damage to property, always remove
power to the thermostat by turning off
the HVAC equipment at the circuit
breaker panel, prior to performing any
steps related to connecting or changing
the thermostat wiring!
5. Mount the new back plate to the wall,
using the appropriate method, for
example, with the supplied drywall
anchors. Position the plate, to cover the
hole in the wall, and check the level of
the plate, as needed. Do not overtighten
the mounting screws, as this will warp
the back plate, adversely impacting the
thermostat operation.
| General | Details |
|---|---|
| Name | YOLINK YS4003-UC Smart Thermostat User Guide |
| Make | YOLINK |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.3 MB |
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