Installation Manual

ManualsBrandsLeviton ManualsBuilding SuppliesLeviton RC-1000WH Omnistat2 Conventional & Heat Pump Thermostat, White

DESCRIPTION

The RC-1000 is a precision digital thermostat designed for 24 VAC heating and cooling systems.

The RC-1000 will support the following systems:

Single Stage Heat/Cool Conventional

Heat Pump (2 Stage Heat / 1 Stage Cool)

Dual Fuel Heat Pump (2 Stage Heat / 1 Stage Cool)

The RC-1000 has the capability of being controlled both locally and by remote control. It offers

programmability, stand-alone operation, and robust, optically isolated communications with

automation systems, utility control systems, and personal computers.

Electrical rating: 24 V; 2 A; 50/60 Hz

Maximum current: 2 A on any circuit, 3 A total

The following requirements must be observed for installation in Europe: CE

1. This equipment must be installed in accordance with National wiring rules for the country in

which it is installed.

2. All product labels, instructions and markings relating to safety must be translated to a

language, which is acceptable in the country in which this equipment is to be installed.

PK-93329-10-B0-0AAR2253

(65I00-1)

WARNINGS AND CAUTIONS

• Readandunderstandallinstructions.Followallwarningsandinstructionsmarkedonthe

product.

• Donotusethisproductnearwater-e.g.,nearatub,washbasin,kitchensinkorlaundrytub,in

a wet basement, or near a swimming pool.

• Neverpushobjectsofanykindintothisproductthroughopenings,astheymaytouch

dangerous voltages.

•

Never install communications wiring or components during a lightning storm.

• Neverinstallcommunicationscomponentsinwetlocationsunlessthecomponentsare

designed speciﬁcally for use in wet locations.

• Nevertouchuninsulatedwiresorterminalsunlessthewiringhasbeendisconnectedatthe

network interface.

• 

Use caution when installing or modifying communications wiring or components.

• SAVETHESEINSTRUCTIONS.

Removing an existing thermostat

1. Disconnect the power to the control transformer.

2. Remove the cover to the existing thermostat.

3. Disconnect the wires going to each terminal on the thermostat. Label each wire with the letter

or number at the terminal.

4. Remove the existing plate or base from the wall.

MOUNTING

When mounting the RC-1000, grasp the thermostat by the sides, avoiding the keys, and unsnap

the base from the face. Holding the base to the wall so that the word “UP” is upright and facing

you:

1. Mark the two mounting holes on the wall using a pencil.

2. Drill a hole using a 3/16” bit at each mounting hole marking.

3. Install the two wall anchors supplied.

4. Slide the system wires through the opening in the base.

5. Mount the base to the wall using the two #6 x 1/2” self-tapping screws supplied - See Figure 1.

INSTALLATION

Before installing this thermostat:

1. Read all of the Installation Instructions carefully.

2.ReadtheOwner’sManualcarefully.

3. Ensure that this product is suitable for your application.

4. Ensure that wiring complies with all codes and ordinances.

5. Disconnect power to the control transformer to prevent electrical shock and damage to

equipment.

6. Select an appropriate location to ensure an accurate temperature reading.

Location

When replacing an existing thermostat, install the RC-1000 in the same location. If the existing

locationdoesn’tmeetthefollowingcriteria,chooseanewlocationtomounttheRC-1000.When

choosing a location for the thermostat:

1. Ensure that the thermostat is mounted 5 feet above the ﬂoor and is at least 2 feet from an

outdoor wall.

2. Ensure that the thermostat is located in an area where there is adequate air circulation.

3. Do not mount in the path of direct sunlight or of radiant heat generated by appliances.

4. Do not mount behind an outdoor wall, near a ﬁreplace, or in the path of any air ducts.

Wall

Base

Tab

Slot

Temperature

Sensor

Figure 2

Figure 3

Figure 1

Align the tabs of the thermostat face with the slots of the thermostat base. Gently push the ther-

mostat face into the thermostat base locking it into place - See Figure 2.

NOTE: Be sure that the thermostat temperature sensor is standing up, and that it has not been

damaged during installation - See Figure 3.

Connect each wire to the terminal strip(s) on the thermostat base per the wiring diagram for your

system application - See Figures 4 - 7. Form the thermostat wiring so that the cable lies ﬂat

between the terminal strip(s) and the center of the base - See Figure 2.

If a remote system or temperature sensor is being used with the thermostat, connect the remote

system or temperature sensor wiring per the diagram for the application - See Figures 8 - 11.

Upon completion of wiring the thermostat, push all excess wiring into the hole in the wall. Plug

the hole with the supplied insulating foam to ensure an accurate temperature reading by the

thermostat.

TYPICAL WIRING DIAGRAMS

CAUTION: Do not short gas valve, fan, heat relay, or cool relay...

even momentarily.

Do not attempt to hook up to live circuits. An accidental connection to a component on the

thermostat circuit board could cause damage to the thermostat.

ForHVACsystemswithasingletransformer,themetaljumperbetweenTerminal1(RC)and

Terminal 2 (RH) on the left terminal strip must remain in place.

Important Notes:

1.ForHVACsystemswithasingletransformerforheatingandcooling,themetaljumper

between Terminal 1 (RC) and Terminal 2 (RH) on the left terminal strip must remain in place –

See Figure 4.

2. From the factory, the RC-1000 is conﬁgured to control a single stage conventional HVAC

system.

If the HVAC system is a heat pump or dual fuel heat pump, before operating the thermostat, the

“SystemType”settingsunder“SystemOptions”mustbecongured–SeeInstallationSettings.

24VAC "HOT"

24VAC Common

24VAC

CONTROL

TRANSFORMER

THERMOSTAT

(C)

(RC)

JUMPER

For HVAC systems with a single transformer, the metal jumper between Terminal 1 (RC) and

Terminal 2 (RH) on the left terminal strip must remain in place.

Figure 4 – Thermostat power-up for test or configuration purposes

3. When conﬁgured as a conventional thermostat, by default this thermostat does not turn the fan

on with a call for heat. If the furnace requires the thermostat to turn the fan on with a call for

heat,congurethe“SystemMode”to“FanOnWithHeat”under“SystemOptions”.

4. A conventional thermostat can be conﬁgured for automatic changeover heat/cool, manual

changeover heat/cool, heat only, or cool only thermostat.

5. To disable the Task Buttons and Scroll Wheel to prevent local control of the thermostat, the

buttonsjumper(J6)labeled“BUTTONS”onthethermostatprintedcircuitboardmustbe

removed.

6. Refer to the “Conﬁguration” steps under the wiring diagram for the respective HVAC system

type.

7. If the thermostat or HVAC system does not perform as stated in the “Power Up” steps under

the wiring diagram for the respective HVAC system, recheck all wiring - See Troubleshooting

Tips.

8.ForHVACsystemswithseparateheatingandcoolingtransformers,themetaljumperbetween

Terminal 1 (RC) and Terminal 2 (RH) on the left terminal strip must be removed – See Figure 5.

24VAC Common

24VAC Cool "HOT"

24VAC

COOL

TRANSFORMER

24VAC Heat "HOT"

24VAC

HEAT

TRANSFORMER

REMOVE

JUMPER

THERMOSTAT

(C)

(RH)

(RC)

For HVAC systems with separate heating and cooling transformers, the metal jumper between

Terminal 1 (RC) and Terminal 2 (RH) on the left terminal strip must be removed.

Figure 5 – Connections for heat and cool transformers - applies to all systems

CONFIGURATION

From the factory, the RC-1000 is conﬁgured as a single stage conventional heat/cool thermostat.

In the default conﬁguration, this thermostat does not turn the fan on with a call for heat. If the

furnace does not turn the fan on with a call for heat, the thermostat must be conﬁgured to do so

under“SystemOptions”.

POWER UP

1. Double check wiring, be sure that there are no stray wires or wire strands at the connections.

2. Connect power to the transformer and system. The display will show the current thermostat

settings.

3.Press[FAN]andselect“On”.Thefanshouldcomeon.

4. Press [FAN] and select “Auto”. The fan should go off.

5. Set the Mode to “Heat”. Raise the desired heat setting above the current temperature. Ensure

thattheheatingunitcomeson.Setthemodeto“Off”.Ensurethattheheatingunitgoesoff.

6. Set the Mode to “Cool”. Lower the desired cool setting below the current temperature. Ensure

thatthecoolingunitcomeson.Setthemodeto“Off”.Ensurethatthecoolingunitgoesoff.

The RC-1000 thermostat is designed to work with most single state conventional 4-wire HVAC

systems (without a transformer common). However, if the RC-1000 “resets” when calling for heat

or cool, or if the heat, cool, or fan relay cannot supply 15mA to power thermostat without the relay

activating,thetransformercommonwireortheLEVITONThermostatPowerSupplyModule(Part

Number: 30A00-1) is required.

Single Stage Conventional

24VAC "HOT"

Heat

24VAC Common*

Fan

Cool

Humidifier

Dehumidier

24VAC

CONTROL

TRANSFORMER

Dehumidifier

Humidifier

Fan Relay

Cool Relay

Heat Relay

HVAC SYSTEM

THERMOSTAT

(RC)

(C)

(Y1)

(G)

(W1)

(D)

(H)

* Common wire is required in “heat only” or “cool only” applications. Also use a common if heat, cool,

or fan relay cannot supply 15mA to power thermostat, without activating.

Figure 6 – Connections for single stage heat/cool thermostat

About Heat Pump Systems

Terminal5(O)isenergizedforcoolingTerminal6(B)isenergizedforheating.

In most applications, the reversing valve is energized for cooling and should be connected to the

“O”terminal.Iftheheatpumprequiresthereversingvalvetobeenergizedforheating,connect

the reversing valve to the “B” terminal.

2)To temporarilydisableEnergyEfcientControlandheatasquicklyaspossible,press[HOLD]and

select“On”.TheRC-1000willusetheAuxiliaryHeatasneededtoreachtheheatsetting.

3) Terminal 9 (L) is used to indicate a fault with the heat pump compressor. When there is a

compressor fault, the display will ﬂash red and the “Heat Pump Fault” error message is shown.

4) The Emergency Heat Relay (E Terminal) and outdoor thermostats (usually accessories to a heat

pump), are not used. The RC-1000 automatically controls auxiliary heat efﬁciently. If the heat

pump is equipped with an outdoor thermostat, it should be removed from the auxiliary heat circuit.

About Dual Fuel Heat Pump Systems

A dual fuel heat pump typically has a gas furnace combined with a heat pump. The gas furnace is

used as auxiliary heat unless the outdoor temperature is very low, in which case it is used as the

primary heat source.

1) When used with dual fuel heat pumps, the RC-1000 requires a method for obtaining the outdoor

temperature. A temperature sensor can be physically connected to the “Remote Temp. Sensor”

terminals on the thermostat or the RC-1000 can obtain the outdoor temperature from a remote

system.

If the RC-1000 can not obtain the outdoor temperature, the heat pump compressor will not

operate and the thermostat will only call for the auxiliary heat until the problem is resolved.

Whenthisoccurs,thedisplaywillashredandthe“ProblemWithOutdoorTemperatureSensor.

Some Heat Stages May Be Disabled” error message is displayed. After the error has been

acknowledged,“OutdoorSensorFault”willbedisplayedintheMessageBaruntiltheproblemis

resolved.

2) Balance Setpoint Limits:

If the outdoor temperature is above the “Upper Balance Setpoint” (45°F by default), the heat

pump is used exclusively.

If the outdoor temperature falls below the “Upper Balance Setpoint” but is above the “Lower

Balance Setpoint” (35°F by default) and if the heat pump is unable to heat at a rate of 5 degrees

per hour or better, the heat pump will turn off and auxiliary heat will be used until the call for heat

has been satisﬁed.

If the outdoor temperature falls below the “Lower Balance Setpoint”, the heat pump will turn off

and the auxiliary heat will be used until the call for heat has been satisﬁed.

TheBalanceSetpointLimitscanbeadjustedaccordingtothemanufacturer’sspecicationsunder

“Balance Setpoint” – See Installation Settings.

3) When the RC-1000 makes a call for auxiliary heat, the heat pump compressor is turned off and

the auxiliary heat is used exclusively.

CONFIGURATION

The“SystemType”forthisthermostatmustbesetto“HeatPump”under“SystemOptions”.

The “System Type” for this thermostat must be set to “Dual Fuel Heat Pump” for a dual fuel

system (Terminal “W2” is connected to the “W” or “W1” on the furnace).

POWER UP

1. Double check wiring, be sure that there are no stray wires or wire strands at the connections.

2. Connect power to the transformer and system. The display will show all of the thermostat

settings.

3.Press[FAN]andselect“On”.Thefanshouldcomeon.

4. Press [FAN] and select “Auto”. The fan should go off.

5.Press[HOLD]andselect“On”tooverrideEnergyEfcientControl.

6. Set the Mode to “Heat”. Raise the desired heat setting 1 degree above the current

temperature. Ensure that the heat pump comes on, in heating mode. After a few minutes,

raise the desired heat setting 3 degrees above the current temperature. Auxiliary heat should

come on. After a few minutes, set the mode to “EM Heat”. The heat pump should stop but the

auxiliaryheatshouldremainon.Setthemodeto

“Off”.Ensurethatboththeheatpumpand

auxiliary heat go off.

7. Set the Mode to “Cool”. Lower the desired cool setting below the current temperature. Ensure

thattheheatpumpcomeson,incoolingmode.Setthemodeto“Off”.Ensurethatthecooling

unit goes off.

8.Press[HOLD]andselect“Off”toenableEnergyEfcientControl.

Heat Pump (2 Stage Heat / 1 Stage Cool)

Heat 1

Heat 2

24VAC Common*

24VAC "HOT"

Dehumidier

Humidifier

Cool 2

Cool 1

Fan

24VAC

CONTROL

TRANSFORMER

Heat 2 Relay

Heat 1 Relay

Cool 1 Relay

Fan Relay

Cool 2 Relay

Humidifier

Dehumidifier

THERMOSTAT

HVAC SYSTEM

(RC)

(C)

(W1)

(Y1)

(G)

(H)

(D)

(Y2)

(W2)

Figure 7 – Connections for heat pump thermostat

REMOTE SYSTEM WIRING DIAGRAMS

This thermostat has been pre-programmed with energy saving program schedules. When used

with a remote system, it is recommended that the Program Mode be conﬁgured as “None” or

“Occupancy”.Thiswilldisabletheinternalprogramschedules.

SETTING THE COMMUNICATIONS JUMPER

Thisthermostatcomesfromthefactorywiththecommunicationsjumper(J8)labeled“COMM

JUMPER”onthethermostatprintedcircuitboardinstalled-SeeFigure8.

WhenconnectingtoanLEVITONHomeControlsystemorremoteswitch,thisjumpermustbe

installed.

WhenconnectingtoaPCorotherdevicewithaserialport,thisjumpermustberemoved.

COMMUNICATIONS JUMPER

COMM JUMPER

FIGURE 8–COMMUNICATIONSJUMPER

LEVITON HOME CONTROL SYSTEMS

ThethermostatcanbeconnectedtoanLEVITONHomeControlsystem.Thecontrollercansend

commands to the thermostat to change mode, cool setting, heat setting, status of fan and hold,

and other items.

Runa3(or4)conductorwirefromtheLEVITONsystemtothethermostatlocation.All

thermostatsonanLEVITONHomeControlsystemareconnectedtoGround,Zone+16,and

Output8-SeeFigure9.

Notes:

1. Additional thermostats are connected in parallel. They may be connected in home-run or daisy

cLevitonn conﬁguration.

2.WhenconnectingtoanLEVITONHomeControlSystem,thecommunicationsjumper(J8)

labeled“COMMJUMPER”onthethermostatprintedcircuitboardmustbeinplace.

3.AllthermostatsonanOmniLTcontrollerareconnectedtotheGRN(Green),BLK(Black),and

YEL (Yellow) terminals under the section marked “TSTAT”.

THERMOSTAT

CONTROLLER

Black

Green

Yellow

Communication

Jumper

Figure 9 – Connections to LEVITON Home Control System

WEB VERSION

Summary of content (2 pages)

PAGE 1
INSTALLATION TYPICAL WIRING DIAGRAMS Before installing this thermostat: WARNINGS AND CAUTIONS • Read and understand all instructions. Follow all warnings and instructions marked on the product. • Do not use this product near water - e.g., near a tub, wash basin, kitchen sink or laundry tub, in a wet basement, or near a swimming pool. • Never push objects of any kind into this product through openings, as they may touch dangerous voltages.
PAGE 2
REMOTE TEMPERATURE SENSOR DISABLE LOCAL CONTROL The thermostat can be connected to a remote switch to toggle the desired heat and cool temperature settings between preset setpoints. A signal can be sent from the remote switch location to change the thermostat temperature settings from the Occupancy Day temperature settings to the Occupancy Night temperature settings. To use this mode, the “Program Options” setting must be set to “Occupancy” - See Program Options.