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

WIRING DIAGRAMS
9
Typical Heat Only System With Fan
In many systems with no emergency
heat relay, a jumper can be installed
between E and W2.
Note:
FAN RELAY
HEAT RELAY
(HOT)

WIRING DIAGRAMS
10
Typical 3H/2C or 2H/1C Heat Pump System
FAN RELAY
EMERGENCY
HEAT RELAY
COMPRESSOR
RELAY
COMPRESSOR
RELAY 2
COOL REVERSING
VALVE
HEAT REVERSING
VALVE
AUXILIARY
HEATRELAY
(HOT)
Typical 2H/2C System: 2 Transformers
COMPRESSOR
RELAY
FAN RELAY
HEAT RELAY
HEAT RELAY 2
COMPRESSOR
RELAY 2
REMOVE JUMPER
(HOT)
(HOT)

11
1. Press MENU.
2. Press and hold TECHNICIAN SETUP for 3 seconds.
3. Congure the installer options as desired using the table below.
4. Use or to change settings and the NEW STEP or PREV STEP to move from one
step to another. Note: Only press DONE when you want to exit the Installer Setup options.
INSTALLER SETUP
Settings Display Adjustment Options Default
Setup WiFi WiFi router parameter conguration
Filter Change
Reminder
This setting will ash FILT in the
display after the elapsed run time
to remind the user to change the
lter. The OFF setting will disable
this feature.
The lter change reminder can be
adjusted from OFF to 2000 hours
in 50 hour increments. Press the
second button from the top left side
of the thermostat to display the
current lter elapsed run time.
OFF
Room
Temperature
Calibration
This setting allows the installer to
change the calibration of the room
temperature display so that, for
example, the thermostat would read
74°F instead of 70°F.
The room temperature display
can be adjusted to read 4° above
or below the factory calibrated
temperature.
0

12
Settings Display Adjustment Options Default
Minimum
Compressor
On-Time
The installer can select the
minimum run time for the
compressor to help protect the
compressor from short-cycling.
The minimum compressor run time
can be adjusted from OFF to 3, 4, or
5 minutes. If 3, 4, or 5 is selected,
the compressor will run for at least
the selected time before turning off
(although the fan may continue to
run for a short time).
OFF
Compressor
Short Cycle
Delay
The compressor short cycle delay
setting will not allow the compres-
sor to be turned on for 5 minutes
after it was last turned off in order
to protect the compressor.
The compressor short cycle
delay setting can be removed by
selecting OFF.
ON
Cooling
Differential
The cooling differential is factory
preset at 0.5°. This means that
whenever the room temperature
heats by 0.5° full degree from the
temperature setting, the cooling
system will turn on. If the cooling
system turns on too often, increase
the temperature differential.
The cooling differential setting is
adjustable from 0.2°F to 2°F. 0.5
INSTALLER SETUP

INSTALLER SETUP
13
Settings Display Adjustment Options Default
Heating
Differential
The heating differential is factory
preset at 0.4°. This means that
whenever the room temperature
cools by 0.4° from the temperature
setting, the heating system will turn
on. If the heating system turns on
too often, increase the temperature
differential.
The heating differential setting is
adjustable from 0.2°F to 2°F. 0.4
Heat Pump The thermostat can be optionally
congured to operate a heat pump.
Use or to
congure the setting. OFF for
conventional systems and ON
for heat pump systems.
OFF
System
Switch
The system switch can be cong-
ured for the particular application.
Heat - Off - Cool, Heat - Off, Cool -
Off, Heat - Off - Cool - Auto.
Note: Emergency Heat is available
in heat pump mode only.
Use or until the
desired application is ashing.
AUTO = (Auto Changeover)
OFF
Stages of
Heat and Cool
If the heat pump is still ON, this
thermostat can be congured to op-
erate up to 2H/2C conventional, or
up to 4H/2C heat pump system.
Use or to select stages
of heat, press NEXT, then select
stages of cool. 3 or 4 heat will use
Y1 and Y2 as 1st and 2nd stage
of heat.
2
STAGES

14
INSTALLER SETUP
Settings Display Adjustment Options Default
Cooling Fan
Delay
The cooling fan delay setting delays
the fan from coming on in cool
mode and keeps it running after
the compressor shuts off for a
short time in order to save energy.
The cooling fan delay can be set
to OFF, 15, 30, 60 or 90 seconds.
If 15, 30, 60 or 90 is selected, the
fan will not turn on for at least the
selected time when there is a call
for cool and will run for at least the
selected time after satisfying the
call for cool.
OFF
Heating
Temperature
Set-Point
Limit
This setting establishes a maximum
value above which the set-point
temperature value cannot be raised.
Use or to select
the maximum heat temperature
set-point. The maximum heat
temperature set-point is 90°F.
Range 44°F - 90°F
90°
Cooling
Temperature
Set-Point
Limit
This setting establishes a maximum
value above which the set-point
temperature value cannot be
lowered.
Use or to select
the maximum cool temperature
set-point. The minimum cool
temperature set-point is 44°F.
Range 44°F - 90°F
44°
F° or C°
Select F for Fahrenheit temperature
display or select C for Celsius
display.
°F for Fahrenheit
°C for Celsius F°
F OR C SET

15
INSTALLER SETUP
Settings Display Adjustment Options Default
12 or 24
Hour Clock Select a 12 or 24 hour clock setting. Use or to select
12 or 24 hour clock.
12 Hour
Clock
Fan
Operation
Select GAS or ELEC depending on
the type of furnace. GAS or ELEC GAS
Morning
Recovery
This setting will start heating early
to bring the building temperature
to its programmed set-point by the
beginning of the WAKE time period.
Use or
to turn ON or OFF. ON
Display
Light
The display light can be congured
to come on when any key is pressed
or to stay on all of the time.
AUTO - Any key ON
ON - Always ON AUTO
Contractor
Call Number
The thermostat allows
installers to put their phone
number in the display.
If selected ON, the input screen will
appear after pressing NEXT STEP.
Use or key to select the
desired telephone number and the
FAN or SYSTEM key to change
characters.
OFF

16
INSTALLER SETUP
Settings Display Adjustment Options Default
Beep
The thermostat can be congured
to make an audible beep when any
key is pressed.
If ON is selected,
the beep will sound.
If OFF is selected,
the beep will be silenced.
ON
MACID This step shows the MAC address
of WiFi module.
Firmware
Version
This step shows the version of
rmware that is installed on the
thermostat.
Press NEXT to move to next step.
Press DONE to exit. Press and hold
TECH to enter ADVANCED TECH
STEPS.
Factory
Default
Reset
This step resets all WiFi settings to
factory default. Press YES to reset.

PROGRAMMING
17
Differential Setting
The second stage will turn ON at 2x the differential setting and OFF at 1x the differential
setting. For example, if the differential setting is 0.5° for heating and the thermostat is set at
70°F, the rst stage will turn on at 69.5°F. The second stage will turn on at 69°F and turn off at
69.5°F. If the third stage is used, the third stage will turn on at 68.5°F and turn off at 69°F.
Keypad Lockout
The installer can activate a keypad lockout after exiting Tech Setup.
Auto Changeover
In Auto mode, users can toggle between Auto Heat or Auto Cool by pressing System only
when the current mode has reached its temperature set point. To switch out of Auto mode,
hold down System. To return to Auto mode, toggle the System key to Auto.
Reminders
Once a Reminder has been turned on and set, the elapsed time can be checked by navigating
the Tech Setup step. The time can be reset by pressing and holding the third button from the
left for 3 seconds. Resetting an expired Reminder can be done by pressing and holding the
3rd button from the left for 3 seconds.
Contractor Call Number
If contractor call number is selected ON, the selected phone number will show in the display if
there has been a continuous call for heating or cooling for 24 hours or if the FAN button is held
down for 3 seconds. To remove the phone number from the display, hold the FAN button down
for 3 seconds.
Programming Notes

PROGRAMMING
18
Set Time of day and day of the week (If using programming)
1. Press the MENU button.
2. Press SET TIME.
3. Day of the week will be ashing. Use or to select the current day
of the week.
4. Press NEXT.
5. The current hour will be ashing. Use or to select the current hour.
Note the correct a.m. or p.m. indicator is selected.
6. Press NEXT.
7. The minutes will be ashing. Use or to select current minutes.
8. Press DONE when completed.