Robertshaw RS10420T User manual

RS10420T
Installation Manual

The Robertshaw®Programmable WiFi Thermostat allows you to control thetemperature
anytime and anywhere. It features a large backlit display and LCD touchscreen for ease of
operation. Compatible with any IOS or Android Smartphone.
Thermostat System Types
Power Options
Hardwire (Common Wire) only
Gas, Oil, or Electric Heat with Air Conditioning
Heat Pumps (without auxiliary or emergency heat)
Multi-Stage Systems
Heat-Only, including for Floor and Wall-Furnace
Cool-Only
750 Millivolt Heating Systems
INSTALLATION MANUAL
1
IMPORTANT SAFETY INFORMATION
WARNING:
• Always turn off power at the main power source
by unscrewing fuse or switching circuit breaker
to the off position before installing, removing,
cleaning, or servicing thermostat.
• Read all of the information in this manual before
installing or programming this thermostat.
• This is a 24V AC low voltage thermostat. Do not
install on voltages higher than 30V AC.
• All wiring must conform to local and national
building and electrical codes and ordinances.
• Do not short (jumper) across terminals on
the gas valve or at the system control to test
installation. This will damage the thermostat and
void the warranty.

INSTALLATION MANUAL
Table of Contents Page
Installation Location 3-4
Thermostat Quick Reference 5
Wiring 6-7
Wiring Diagrams 8-10
Installer Setup 11-16
Programming 17-20
Setting Up WiFi Connection and App 21
Specications
Temperature Display Range........................ 32°F to 99°F (0°C to 40°C)
Temperature Control Range ....................... 41°F to 90°F (5°C to 32°C)
Load Rating ................................................ 1 amp per terminal, 1.5 amp maximum
all terminals combined
Differential .................................................. Heating is adjustable from 0.2°to2.0°
Cooling is adjustable from 0.2° to2.0°
Power Source ............................................. 18 to 30 VAC, NEC Class II, 50/60 Hz for hardwire
Operating Ambient Temperature................. 32°F to +105°F (0°C to +41°C)
Operating Humidity .................................... 90% non-condensing maximum
Dimensions ................................................. 4.7”W x 4.4”H x 1”D
2

3
INSTALLATION LOCATION
Wallplate Installation
1Horizontal Mount
2Vertical Mount
For a vertical mount, put screws on
the top and bottom.
For a horizontal mount, put screws
on the left and the right.
Caution:
Electrical Hazard
Disconnect power before installing this
product. Failure to do so can cause
electric shock or equipment damage.
Mercury Notice
This product is mercury-free. However,
if this product is replacing a control
which contains mercury, it needs to
be disposed of properly. Contact your
local waste management authority for
instructions regarding recycling and
proper disposal of the control.

INSTALLATION LOCATION
4
Mounting Thermostat
WAKE
Heat
Menu
Auto
On
IAQ
Sun
Set At
FAN
SYSTEM
Align the 4 tabs on the faceplate with the
corresponding slots on the back of the
thermostat, then push gently until the
thermostat snaps into place.
Install the thermostat 4 to 5 feet above the
oor in an area with good air circulation
and average temperature.
For new installations, mount thermostat
on an inside wall, 4-5 feet above the oor.
Do not install the thermostat in the following
locations:
• Behind a Door
• In a Corner
• Near Air Vents
• In Direct Sunlight
• With an Outside Wall Behind the Thermostat
• Near any Heat or Steam Generating Fixtures
• Near any Concealed Pipes or Chimneys
Installation at these locations will affect thermostat operation.

Getting to know your thermostat
1 Fan Buttons
2 Next Step Buttons
3 Set Time Buttons
4 Program Buttons
5 Menu Buttons
6 System Buttons
7 Set-Point Buttons
1 Days of the week and time
2 Indicates the current room temperature
3 Displays the user selected
set-point temperature
4 Hold is displayed when thermostat
program is overridden.
5 System Operation Indicators: If these icons
are ashing, there is a 5-minute delay for
compressor protection.
6 Programmable Time Periods: Residential
uses 4 time periods - WAKE, RETURN,
LEAVE and SLEEP.
7 Program Menu Options:Shows different
options during programming.
Sun Mon Tue Wed Thu Fri Sat
WAKE LEAVE RETURN SLEEP
HOLD
Auto
On
IAQ
Technician
Setup
NextStep
Set Time
Clean
NextZone
Set Schedule
Hold
PreviousStep
Run Schedule
Menu
Done
Heat
Off Cool
Auto
Em.heat
FAN
SYSTEM
Set At
Sun Mon Tue Wed Thu Fri Sat
WAKE LEAVE RETURN SLEEP
AM
PM
Technician
Setup
NextStep
Set Time
Clean
NextZone
Set Schedule
Hold
PreviousStep
Run Schedule
Menu
Done
Heat
Off Cool
Auto
Em.heat
SYSTEM
Set At
Auto
On
IAQ
HOLD
FAN
THERMOSTAT QUICK REFERENCE
5

Installation Tip
Do not overtighten terminal block screws, as this can damage the
terminal block. A damaged terminal block can keep the thermostat
from tting on the subbase correctly or cause system operation issues.
Max Torque = 6in/lbs.
WIRING
6
Terminal Designations
CONVENTIONAL
HVAC
Y1 Y2 W/E W2
0 B
HEAT PUMP
COOL MODE
STAGE 1
HEAT 1
COOL 1
HEAT 2
COOL 2
HEAT 2
AUX 1
HEAT 3
AUX 2
HEAT 3
AUX 2
HEAT 2
AUX 2 HEAT PUMP
REVERSING
VALVE -
ENERGIZED
DURING
COOLING
HEAT PUMP
REVERSING
VALVE -
ENERGIZED
DURING
HEATING
HEAT 3
EMHEAT
HEAT 4
EMHEAT
AUX 1
AUX 1
HEAT 2
COOL 2
HEAT 2
COOL 2
1H / 1C
2H / 1C
3H / 1C
2H / 2C
3H / 2C
4H / 2C
COOL MODE
STAGE 2
HEAT MODE
STAGE 1
HEAT MODE
STAGE 2
––

WIRING
7
Notes
Wire Specications
Use 18- to 22-gauge thermostat wire.
Shielded wire is not required.
Emergency Heat Operation:
In many heat pump systems with no
emergency heat relay, a jumper can
be installed between Eand W2 to turn
thermostat into a single stage control
for Emergency Heat Operation.
Float Switches:
A oat switch or similar device
which breaks the control wire (Y) not
the power (R) should be installed.
Interrupting the power circuit will
shut off the power to the thermostat
completely and stop it from operating.

WIRING DIAGRAMS
8
Power supply
Factory-installed jumper. Remove only when installing on
2-transformer systems
Use either O or B terminals for reversing valve
24 VAC common connection
Typical 2H/2C System: 1 Transformer
COMPRESSOR
RELAY
COMPRESSOR
RELAY 2
HEAT RELAY
FAN RELAY
(HOT)
HEAT RELAY 2 COMPRESSOR
RELAY
(HOT)
FAN RELAY
Typical Cool-Only System With Fan