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SunStat 500670 - User Manual

SunStat 500670
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5
sensor
2. Installation
Remove the Thermostat Face
1.RemovethethermostatFrontModule
fromthePowerModulebyopeningthedoor
andlooseningthescrew.
2. Pulloutwardnearthebottomonthe
FrontModuleandliftoff.
Prepare the Wiring
1.Findalocationforyourthermostat.Itis
suitableforindooruseonly,oninsulatedor
uninsulatedwalls.Locateitabout4
1
⁄2feet
to5feetabovetheooronaninsidewall.Makesureitiswellventilatedand
notlocatedinaconnedspacesuchasasmallclosetorcabinet.Avoidplacing
itnearotherheatsourcessuchashot-waterpiping,heatduct,wall-mount
lighting,anddirectsunlighttohelppreventadverselyaffectingthethermostat.
2. Turnoffthepowertotheoorwarmingsystematthemaincircuitpanel
beforedoinganyelectricalwork.
3. Aqualiedelectricianshouldrunadedicatedcircuitfromthemainc
ircuit
paneltothethermostatlocation.
4. Ifadedicatedcircuitisnotpossible,youmaytapfromanothercircuitinthe
room.Makesurethereisenoughloadcapacity(amps)tohandletheaddition
ofyouroorwarmingsystem,andthatitisNOTwiredinserieswithanyother
device,includingotherGFCIs.
Owner’s Manual
Your new SunStat Pro thermostatisdesignedtocontrolthevoltageto
eithera120VACor240VACresistiveoorwarmingsystem.
Pleasefollowthismanualforcompleteinstallationandoperationinstructions.
Ifyouhaveanyquestionsorcomments,trycallingTechnicalSupportat
1-888-432-8932.
CAUTION:Makesureyouarequaliedandarefamiliarwithhousewiring.
Thisisalinevoltagedevicethatcouldcauseseriousinjuryordamageif
improperlyinstalled.
Connect Wires
1. Matchandconnectthetwowires
marked“LINE1”and“LINE2”tothe
powersupplywiresusingthewirenuts
provided.
2. Gentlytugonthewirestomakesure
theyaresecure,otherwiseawirecould
loosenandcausefailure.
3. Overwrapthewirenutswithelectrical
tapetobettersecurethemtothewires.
4. Matchandconnectthetwowires
marked“LOAD1”and“LOAD2”tothe
oorwarmingsystemleadwiresand
securethesewiresthesameway.
5. Connectthehousegroundwiretothe
greenorbareleadwire(s)ofyouroor
warmingsystem.
6. Inserttheendsoftheoorsensor
wireintothe“SENSOR”terminals(1and
2)andtightenthescrews.Thereisno
polarity,soitdoesnotmatterwhichwire
endgoesintowhichterminal.
CAUTION:Beforecontinuing,make
sureyourpowersupplyvoltagematches
thevoltage
ratingofyouroorwarming
system.
Connecting240Vtoa120Voorwarm-
ingsystemwillcauseoverheatingand
damagetothesystemandmaydamage
thecontrol,otherwiring,oorcoverings,
etc.
Remote Control
1. Ifyouwanttoconnectyourthermostattoaremotecontroldevice,suchas
ahomeautomationsystem,rstmakesurethattheremotedevicehasa“dry
contact”output(anun-energizedswitch,suchasthecontactsonarelay).Many
homeautomationsystemscomewithsuchanoutputthatopensorclosesat
speciedtimes.
2. Pull2-conductorwire,size18-to24-gage,throughthewallfromtheremote
device,intothiselectricalbox.
3. Connectthewireendsintothe“SETBACK”terminals(5and6)andtighten
thescrews(nopolarity).
SunStat Relays
1. IfyouwanttouseyourthermostattodriveaSunStatRelay(s)(askyourdealer
aboutthisconvenientway
tocontrollargersystemswithonethermostat),rst
readandfollowtheinstructionsfortheSunStatRelaythoroughly.
2. Pull2-conductorwire,size18-to24-gage,throughthewallfromtheSunStat
Relay,intothiselectricalbox.Thiswiremaybeupto100feet(30m)inlength
fromthethermostattothelastSunStatRelayinstalled.
3. Connectthewireendsintothe“RELOUT”terminals(3and4)andtightenthe
screws(ObservepolarityofthewireswhenconnectingtotheSunStatRelay).
Mount the Thermostat
1. Carefullyfoldandpressthewiresbackintotheelectricalbox.Donotuse
thethermostattopushthemin,asthismaycauseconnectionstoloosenand
possiblefailure.
2. SecurethethermostatPowerModule
intotheboxwiththemountingscrews
provided.
3. CarefullysnaptheFrontModuleonto
thePowerModule.
4. Tightenthescrew.
5. Switchonthepo
weratthemaincircuit
panel.
NOTE to contractors:After installing the
thermostat, be sure to:
a. Do a Quick Setup (section 3),
b. Temporarily override the setpoint
SunStatPro
ProgrammableThermostat
Model500670
3. PresstheHOLD/RETURNbuttonorwait15secondsandthethermostatwill
returntothenormaloperatingmode,savingyourselection.Thethermostat
willnowdisplayaP1,P2,P3,orP4atthebottomright.
3. Quick Setup
On/Off Switch
Yourthermostatshouldbeturnedoffwhenit
isrstinstalled.ThedisplaywillshowOFFand
thetimeandday.
1.Slidetheon/offswitchtotheupperposition,
turningthethermostaton.Thedisplaywill
showthetimeandday,temperatures,andother
information.
2. Toturnthethermostatoffanytime,slidethe
on/offswitchtothelowerposition.Noheating
willoccurandallprogrammingisretained.
Change Format Between °F / 12-hour and °C / 24-hour
Yourthermostatisfactorysettooperateineither°F/12hourformator°C/
24hour(militarytime)format.Ifneeded,youmaychangethisatanytimeas
follows:
1.PresstheOPTIONSbuttonandholdfor1second.An°F
and
12hwillshowonthedisplay.
2. Pressthedownorupbuttontotoggleto°Cand24h.
3. PresstheHOLD/RETURNbuttontoreturntothenormal
operatingmode.
Set the Current Time and Day
1.PresstheDAY/TIMEbuttonandholdfor1second.Thehourshouldbe
blinking.
2. Pressthedownorupbuttontoadjustthehour.
3. PresstheDAY/TIMEbuttonbriey.Theminutesshouldbe
blinking.
4. Pressthedownorupbuttontoadjusttheminutes.
5. PresstheDAY/TIMEbuttonbriey.Thedayshouldbeblinking.
6. Pressthedownorupbuttontoadjusttheday.
7. PresstheHOLD/RETURNbuttonorwait15secondsandthe
thermostatwillreturntothenormaloperatingmode,savingyoursettings.
MO
SET TEMP
FLOOR
CYCLE
M
A
°F
1-4
Customized Program Schedule (User)
Tocustomizetheprogramsheduletomeetyourneeds,follow
thesesteps:
1.PressthePROGRAMbuttonandholdfor1second.Proand
U1, P1, P2, P3, or P4willshowonthedisplay.
2.PressthedownorupbuttontoselectU1.
3.PressthePROGRAMbuttonbriey.CYCLE 1andMOthrough
FRwillshowonthedisplay.Thehourshouldbeblinking.
4.Pressthedownorupbuttontoadjustthehour.
5.PressthePROGRAMbuttonbriey.Theminutesshouldbe
blinking.
6.Pressthedownorupbuttontoadjusttheminutes.
7.PressthePROGRAMbuttonbriey.Thesetpointtemperature
shouldbeblinking.
8.Pressthedownorupbuttontoadjustthesetpointtemperature.
Note: A good rule of thumb is to adjust this about 5 to 8°F (3 to 5 °C)
lower during cycles when you are away to help reduce energy use. If you
set the “away” cycles too low, it will take much longer to raise the
temperature again and may result in unsatisfying performance.
Note: Some wood and laminate oor manufacturers recommend a
maximum of 82 to 84°F (27° to 28°C). Check with manufacturer.
9.PressthePROGRAMbuttonbrieytomovetothenextcyclenumber.
10. RepeatSteps3through7toadjusttheremainingcycletimes
andsetpoint
temperaturesMOthroughFR,andfortheotherdaysoftheweek.
11. Whenyounish,oratanytimeduringtheseadjustments,pressthe
HOLD/RETURNbuttonorwait30secondsandthethermostatwillreturntothe
normaloperatingmode.Youradjustmentswillbesaved.
Note: The display in normal operating mode will not show a “U1” indicating
“User” schedule. Also, all schedule adjustments are saved in memory and
will not be lost during power failure.
Note: If you only want to use two cycles during a day, clear the other cycles by
reducing their temperature below 40°F (4.5°C) to show (---).
To use these cycles again, adjust their time and temperature.
from
power
supply
on/off
MO
M
A
SET TEMP
LIMIT
FLOOR
°F
MO
°C
AIR
SET TEMP
SET BACK
LIMIT
FLOOR
USAGE
CYCLE
M
A
M
P
M
A
M
P
°C
°F
°C
°F
TU WE TH FR SA SU
HOLD
GFCI
TRIP
HEATING
°F
P1
P2
P3
P4
LOCK
MO
M
A
HEATING
MO
SET TEMP
CYCLE
M
A
°F
HOLD
USAGE
MO
CYCLE
M
A
°F
TU WE TH
FR
MO
CYCLE
M
A
°F
SET BACK
FLOOR
FLOOR
MO
CYCLE
M
A
°F
FLOOR
Use the Factory Programmed “User” Schedule
Ifyouwanttobeginusingyourthermostatnowwithoutmakinganychangesto
thefactorysetprogrammingschedule,youmayskiptosection“5 Operation”.
Itwilloperateinthe“User”Schedule(U1),pre-programmedasfollows,and
canbecustomizedlatertoyourneeds(seesection“4 Additional Setups”):
4. Additional Setups
Lifestyle Program Schedules (Presets)
Thereareconvenientschedulesalreadysetuptomeettypicallifestyles.Ifyou
seeascheduleP1throughP4youlike,selectoneasfollows:
1.PressthePROGRAMbuttonandholdfor1second.Proand
U1, P1, P2, P3, or P4willshowonthedisplay.
2. PressthedownorupbuttonbrieytoselectP1,P2,P3,orP4.
Theseschedulesarenotabletobemodied,andareasfollows:
MO
M
A
SET TEMP
LIMIT
FLOOR
°F
MO
°C
AIR
SET TEMP
SET BACK
LIMIT
FLOOR
USAGE
CYCLE
M
A
M
P
M
A
M
P
°C
°F
°C
°F
TU WE TH FR SA SU
HOLD
GFCI
TRIP
HEATING
°F
P1
P2
P3
P4
LOCK
MO
M
A
HEATING
MO
SET TEMP
CYCLE
M
A
°F
HOLD
USAGE
MO
CYCLE
M
A
°F
TU WE TH
FR
MO
CYCLE
M
A
°F
SET BACK
FLOOR
FLOOR
MO
CYCLE
M
A
°F
FLOOR
MO
M
A
SET TEMP
LIMIT
FLOOR
°F
MO
°C
AIR
SET TEMP
SET BACK
LIMIT
FLOOR
USAGE
CYCLE
M
A
M
P
M
A
M
P
°C
°F
°C
°F
TU WE TH FR SA SU
HOLD
GFCI
TRIP
HEATING
°F
P1
P2
P3
P4
LOCK
MO
M
A
HEATING
MO
SET TEMP
CYCLE
M
A
°F
HOLD
USAGE
MO
CYCLE
M
A
°F
TU WE TH
FR
MO
CYCLE
M
A
°F
SET BACK
FLOOR
FLOOR
MO
CYCLE
M
A
°F
FLOOR
MO
M
A
SET TEMP
LIMIT
FLOOR
°F
MO
°C
AIR
SET TEMP
SET BACK
LIMIT
FLOOR
USAGE
CYCLE
M
A
M
P
M
A
M
P
°C
°F
°C
°F
TU WE TH FR SA SU
HOLD
GFCI
TRIP
HEATING
°F
P1
P2
P3
P4
LOCK
MO
M
A
HEATING
MO
SET TEMP
CYCLE
M
A
°F
HOLD
USAGE
MO
CYCLE
M
A
°F
TU WE TH
FR
MO
CYCLE
M
A
°F
SET BACK
FLOOR
FLOOR
MO
CYCLE
M
A
°F
FLOOR
to
oor
warming
system
1. Preparation
1.Unpackyourthermostatandmakesureeverythingisingoodcondition:
•Thermostat
•Floor sensor
•Small screwdriver
•Mounting screws
•Wire nuts for wiring connections
Ifanypartsaremissingordamaged,contactthestorewhereyoupurchased
thisthermostat.Donotinstalladamagedpart.
2. Gatherthefollowingtoolsandsupplies:
•Phillipsscrewdriver,holesaw
•Wirestrippers,“shtape”,otherelectricaltools
•Electricalboxforthermostat:
a.Ifyouareconnectingtopowerleadsfromonly1or2oorwarming
systems,youmayuseasingle-gang,3
1
⁄2inchdeepbox.
b.Ifyouareconnectingtopowerleadsfrom3oorwarmingsystems,
usea4x4x2
1
⁄8inchordeeperbox(nota2-gangbox)whenyourwallstuds
arestillexposed.Installasingle-gang“mud-ring”coverontheboxbefore
installingdrywallmaterials.
c.Formorethan3oorwarmingsystemsorotherlayouts,youmayneed
toinstallajunctionboxtoconnectthep
owerleadstogether.Thenuse
housewiretoconnectbetweenthejunctionboxandthethermostat
electricalbox.Seetheinstallationinstructionsforyouroorwarming
systemformoreinformation.
ALWAYS:WireallcircuitsasClass1,ElectricLightandPowerCircuits.
ALWAYS:Wireallcircuitswithinsulationrated600Vminimum.
ALWAYS:Mountthiscontrolonlytoagroundedmetallicboxora
nonmetallicbox.
ALWAYS:Usepowersupplywiressuitableforatleast90°C.
CAUTION:Highvoltage–disconnectpowersupplybeforeservicing.
CAUTION:TheGFCIinthiscontroldoesnotprotectagainstshockifboth
bareconductorsaretouchedatthesametime.
5. Thecircuitbreakerinthemaincircuitpanelshouldbe15ampsmaximum
foraoorwarmingsystemtotaling12ampsorless.Forlargersystemsup
to15amps,use
a20ampmaximumcircuitbreaker.Neverexceed15amps
onthisthermostat.Youmayconsiderusinganarc-fault(AFCI)typecircuit
breakerforadditionalprotection.
6. Pullthepowersupplywiringintothisbox,leavingabout6inchesofwire.
7. Pulltheoorsensorwireandthepowerleadwiresfromyouroorwarming
systemupthewall,intothisbox.Refertoyouroorwarmingsystem
installationinstructionsforplacementoftheoorsensortipintotheoorarea.
Note: The sensor wires should not be run in the same conduit as line voltage
wires to avoid possible interference. If the sensor lead wires are not long
enough, they may be extended an additional 15 feet (4.5 m) using minimum
20-gage 2-conductor wire or up to 50 feet (15 m) using shielded wire.
8. Mounttheelectricalbox.
power
module
front
module
MO
M
A
SET TEMP
LIMIT
FLOOR
°F
MO
°C
AIR
SET TEMP
SET BACK
LIMIT
FLOOR
USAGE
CYCLE
M
A
M
P
M
A
M
P
°C
°F
°C
°F
TU WE TH FR SA SU
HOLD
GFCI
TRIP
HEATING
°F
P1
P2
P3
P4
LOCK
MO
M
A
HEATING
MO
SET TEMP
CYCLE
M
A
°F
HOLD
USAGE
MO
CYCLE
M
A
°F
TU WE TH
FR
MO
CYCLE
M
A
°F
SET BACK
FLOOR
FLOOR
MO
CYCLE
M
A
°F
FLOOR
Cycle 1 2 3 4
Mon-Fri
6:00 am 8:00 am 5:00 pm 10:00 pm
82 F 74 F 82 F 74 F
Saturday
7:00 am 9:00 am 5:00 pm 11:00 pm
82 F 74 F 82 F 74 F
Sunday
7:00 am 9:00 am 5:00 pm 11:00 pm
82 F 74 F 82 F 74 F
U1 (User changeable)
82 F 82 F
74 F 74 F
Note: Air Sensing mode default temperatures are 70F and 62F.
Cycle 1 2 3 4
Mon-Fri
5:00 am 7:00 am 5:00 pm 10:00 pm
82 F 74 F 82 F 74 F
Saturday
5:00 am 9:00 am 5:00 pm 10:00 pm
82 F 74 F 82 F 74 F
Sunday
5:00 am 9:00 am 5:00 pm 10:00 pm
82 F 74 F 82 F 74 F
P1 (Early Riser)
Note: Air Sensing mode default temperatures are 70F and 62F.
Cycle 1 2 3 4
Mon-Fri
5:00 am 8:00 am 6:00 pm 11:00 pm
82 F 74 F 82 F 74 F
Saturday
6:00 am 9:00 am 5:00 pm 11:00 pm
82 F 74 F 82 F 74 F
Sunday
6:00 am 9:00 am 5:00 pm 11:00 pm
82 F 74 F 82 F 74 F
P2 (Longer Day)
Note: Air Sensing mode default temperatures are 70F and 62F.
Cycle 1 2 3 4
Mon-Fri
6:00 am 9:00 am 6:00 pm 10:00 pm
75 F 70 F 75 F 70 F
Saturday
7:00 am 10:00 am 6:00 pm 10:00 pm
75 F 70 F 75 F 70 F
Sunday
7:00 am 10:00 am 6:00 pm 10:00 pm
75 F 70 F 75 F 70 F
P4 (Take the chill off)
Note: Air Sensing mode default temperatures are 65F and 60F.
Cycle 1 2 3 4
Mon-Fri
6:00 am 8:00 am 6:00 pm 10:00 pm
82 F 79 F 82 F 75 F
Saturday
6:00 am 9:00 am 6:00 pm 10:00 pm
82 F 79 F 82 F 75 F
Sunday
6:00 am 9:00 am 6:00 pm 10:00 pm
82 F 79 F 82 F 75 F
P3 (At home during the day)
Note: Air Sensing mode default temperatures are 70F, 67F, and 62F.
Example
Cycle 1 2 3 4
Mon-Fri
--:-- 7:30 am 6:00 pm --:--
-- F
72 F 80 F
-- F
80 F 80 F
72 F
temperature to make sure it is
heating for a few minutes (section 5),
c. Test the GFCI (section 5).

Questions and Answers

  • L
    Lucas FlowersAug 1, 2025
    What to do if my SunStat Thermostat displays Er 4 or Er 5?
    • T
      Tanner TaylorAug 1, 2025
      If your SunStat Thermostat shows an Er 4 or Er 5 error, it indicates that the internal air sensor is faulty. You can replace the thermostat or operate it in floor sense mode. Also, ensure that sunlight or another heat source isn't directed at the thermostat.
  • D
    David HoAug 6, 2025
    How to fix Er 1 or Er 2 error on SunStat 500670 Thermostat?
    • R
      Ryan HuberAug 6, 2025
      If your SunStat Thermostat displays an Er 1 or Er 2 error (only at startup), it could be due to a short-circuited floor sensor. Turn off the power at the breaker and replace the sensor. You can also try resetting to Factory Defaults.
  • G
    Gary FarrellAug 12, 2025
    What does Er 6 or Er 7 mean on my SunStat 500670 Thermostat and how do I fix it?
    • M
      Matthew TuckerAug 12, 2025
      If your SunStat Thermostat displays an Er 6 or Er 7 error, turn off the power at the breaker and contact the factory. You can also try resetting the circuit breaker or replacing the thermostat. Note that the GFCI will no longer function correctly or safely.
  • W
    williammorganAug 18, 2025
    What to do if my SunStat Thermostat works but there is no heat and no display?
    • C
      Candice WilsonAug 18, 2025
      If your SunStat Thermostat is working but there's no heat and the display is off, try the following: Check the wiring connections, reset the thermostat with the on/off switch if the GFCI is tripped, check the resistances on the floor warming system (refer to the system manual), and check the circuit breaker or any upstream protection.
  • C
    Caitlin PetersAug 25, 2025
    Why is the GFCI tripping and the heating occurring at the wrong times on my SunStat Thermostat?
    • J
      Jeremy QuinnAug 25, 2025
      If the GFCI is tripping and the heating is occurring at incorrect times with your SunStat Thermostat, consider these steps: Check the wiring connections, reset the thermostat by switching it off and on, check the resistances on the floor warming system (refer to the system manual), and ensure the current time and schedule times are correctly set to AM or PM. If you have uninsulated concrete, SmartStart may be starting the heating very early; you can disable this feature if desired.

Summary

Preparation & Installation

Unpack & Gather Supplies

Check contents, gather tools, and select an electrical box for installation.

Wiring & Mounting

Detailed steps for connecting wires, mounting the box, and attaching the thermostat.

System Connections

Instructions for connecting remote controls and SunStat Relays.

Quick Setup

Format and Time Settings

How to change display format (°F/°C, 12/24h) and set current time/day.

Using & Customizing Schedules

Select pre-set schedules or create a personalized heating schedule.

Operation Modes & Control

SmartStart & Mode Selection

Manage SmartStart feature and switch between Air Sensing/Regulator modes.

Temperature Adjustments

Temporarily override, hold, or set back temperatures for energy saving.

Floor Limit & Calibration

Set max floor temp & adjust display calibration for accurate readings.

Reset & Remote Control

Restore factory defaults and manage external remote control overrides.

Troubleshooting & Error Codes

Common System & Display Issues

Addresses problems like no heat, no display, GFCI trips, and wrong heating times.

Error Code Explanations

Interprets error codes (Er 1-7) and suggests solutions for sensor/system faults.

Specifications & Warranty

Technical Specifications

Details power supply, load capacity, GFCI, temperature ranges, accuracy, and sensor type.

Certifications & Warranty

Lists ETL listing, safety standards, and warranty terms for the thermostat.

SunStat 500670 Specifications

General IconGeneral
BrandSunStat
Model500670
CategoryThermostat
LanguageEnglish