1
DI-000-RT15Z-00A
(65I00-4ZB)
2
3
4
5
6
7
8
9
10
DESCRIPTION
The RC-1500 is a precision digital thermostat designed for 24 VAC heating and cooling systems.
The RC-1500 will support the following systems:
• Single Stage Heat/Cool Conventional
• Two Stage Conventional (2 Stage Heat / 2 Stage Cool)
• Heat Pump and Geothermal Heat Pump (2 Stage Heat / 1 Stage Cool)
• Two Speed Heat Pump and Geothermal Two Speed Heat Pump (3 Stage Heat / 2 Stage Cool)
• Dual Fuel Heat Pump and Geothermal Dual Fuel Heat Pump
The RC-1500 has the capability of being controlled both locally and by remote control. It offers
programmability, stand-alone operation, and wireless 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.
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-1500 in the same location. If the existing location
doesn’t meet the following criteria, choose a new location to mount the RC-1500. 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.
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-1500, 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.
Figure 1
Connect each wire to the terminal strip(s) on the thermostat base per the wiring diagram for your system
application -
See Figures 4 - 10. 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 temperature sensor is being used with the thermostat, connect the remote system or temperature
sensor wiring per the diagram for the application -
See Figure 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.
Align the tabs of the thermostat face with the slots of the thermostat base. Gently push the thermostat
face into the thermostat base locking it into place -
See Figure 2.
Figure 2
Wall
Base
Tab
Slot
Temperature
Sensor
Figure 3
NOTE: Be sure that the thermostat temperature sensor is standing up, and that it has not been damaged
during installation -
See Figure 3.
TYPICAL WIRING DIAGRAMS
CAUTION: Be sure to disconnect the power to the control transformer before removing or installing thermostat.
CAUTION: Do not short gas valve, fan, heat relay, or cool relay...even momentarily.
CAUTION: 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.
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-1500 is configured to control a single stage conventional HVAC system.
• If the HVAC system is a heat pump, dual fuel heat pump, or if the thermostat is connected to a
zone control system that requires a sub-base, before operating the thermostat, the “System Type”
settings under “System Options” must be configured – See Installation Settings.
• If the HVAC system is a two stage conventional or two speed heat pump, before operating the
thermostat (making a call for heat or cool), the “Cool Stages” and “Heat Stages” settings under
“Stage Settings” must be configured – See Installation Settings.
24VAC "HOT"
24VAC Common
24VAC
CONTROL
TRANSFORMER
THERMOSTAT
UP
(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, configure 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. Refer to the “Configuration” steps under the wiring diagram for the respective HVAC system type.
6. 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.
7. 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.
UP
24VAC Common
24VAC Cool "HOT"
24VAC
COOL
TRANSFORMER
24VAC Heat "HOT"
24VAC
HEAT
TRANSFORMER
REMOVE
JUMPER
THERMOSTAT
(C)
(RH)
(RC)
3
1
2
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
SINGLE STAGE CONVENTIONAL FOR ZONE CONTROL SYSTEMS
(W2)
4
(Y2)
(G)
(Y1)
(W1)
(C)
(RC)
10
1
3
8
6
7
ZONE CONTROLLER
THERMOSTAT
System Cool Mode
Fan Relay
Zone Cool
Zone Heat
System Heat Mode
24VAC
CONTROL
TRANSFORMER
Fan
Cool
Cool Mode
24VAC "HOT"
24VAC Common
Heat Mode
Heat
UP
Figure 7 – Connections for single stage thermostat for zone control systems
CONFIGURATION
• The “System Type” for this thermostat must be set to “Zone Control” under “System Options”.
The two additional outputs (W2 and Y2) are used with zoned heating and cooling systems. The W2 and
Y2 terminals control the mode of operation (heating or cooling) of the zone control panel. The zone control
panel will recognize calls for heat (W) from the individual zones when the W2 terminal is energized, and
calls for cool (Y) when the Y2 terminal is energized. Neither W2 nor Y2 is energized when the mode is set
to “OFF”. Therefore, the RC-1500 can act as a Master to set the operating mode of the entire system.
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.
TWO STAGE CONVENTIONAL (2 STAGE HEAT / 2 STAGE COOL)
UP
Heat 1
Heat 2
24VAC Common*
24VAC "HOT"
Cool 2
Cool 1
Fan
24VAC
CONTROL
TRANSFORMER
Heat 2 Relay
Heat 1 Relay
Cool 1 Relay
Fan Relay
Cool 2 Relay
THERMOSTAT
HVAC SYSTEM
7
6
8
3
1
10
(RC)
(C)
(W1)
(Y1)
(G)
(Y2)
4
(W2)
Figure 8 – Connections for two stage conventional thermostat
CONFIGURATION
• The “System Type” for this thermostat must be set to “Conventional” under “System Options”.
• 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”.
• The “Cool Stages” and “Heat Stages” settings must be configured under “Stage Settings”.
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. Press [HOLD] and select “On” to override Energy Efficient Control.
6. Set the Mode to “Heat”. Raise the desired heat setting 1° above the current temperature. Ensure that Stage
1 heat comes on. After a few minutes, raise the desired heat setting 3°s above the current temperature.
Stage 2 heat should come on. Set the mode to “Off”. Ensure that the heating unit goes off.
7. Set the Mode to “Cool”. Lower the desired cool setting 1° below the current temperature. Ensure that Stage
1 cool comes on. After a few minutes, lower the desired cool setting 3°s below the current temperature.
Stage 2 cool should come on. Set the mode to “Off”. Ensure that the cooling unit goes off.
8. Press [HOLD] and select “Off” to enable Energy Efficient Control.
ABOUT HEAT PUMP SYSTEMS
1. 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. With a call for Stage 2 on a two speed heat pump, both compressor outputs Y1 and Y2 are energized.
When 2 stages of cooling and 2 stages of heating are configured for a heat pump, Stage 2 is
considered high speed on the heat pump and not auxiliary heat. If auxiliary heat (or emergency heat) is
needed, configure 3 stages of heating on the heat pump.
3. To temporarily disable Energy Efficient Control and heat as quickly as possible, press [HOLD] and
select “On”. The RC-1500 will use the Auxiliary Heat as needed to reach the heat setting.
4. 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.
5. The Emergency Heat Relay (E Terminal) and outdoor thermostats (usually accessories to a heat
pump), are not used. The RC-1500 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-1500 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-1500 can obtain the outdoor temperature from a remote system.
If the RC-1500 cannot 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 flash 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°s 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 specifications under
“Balance Setpoint” – See Installation Settings.
3. When the RC-1500 makes a call for auxiliary heat, the heat pump compressor is turned off and the
auxiliary heat is used exclusively.
HEAT PUMP (2 STAGE HEAT / 1 STAGE COOL)
24VAC Common*
24VAC "HOT"
Auxilirary Heat
Compressor
Ground Fault
Fan
Compressor Relay
Aux Heat Relay
Fan Relay
Fault Relay
Reversing Valve
Energized in Cool
Energized in Heat
24VAC
CONTROL
TRANSFORMER
THERMOSTAT
UP
HVAC SYSTEM
7
6
8
3
1
(G)
(Y1)
(B)
(C)
(RC)
4
5
9
(O)
(W2)
(L)
Figure 9 – Connections for heat pump thermostat
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 Efficient Control.
6. Set the Mode to “Heat”. Raise the desired heat setting 1° above the current temperature. Ensure that
the heat pump comes on, in heating mode. After a few minutes, raise the desired heat setting 3°s
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 Efficient Control.
24VAC "HOT"
Heat
24VAC Common*
Fan
Cool
UP
24VAC
CONTROL
TRANSFORMER
Fan Relay
Cool Relay
Heat Relay
HVAC SYSTEM
THERMOSTAT
(RC)
(C)
(Y1)
(G)
(W1)
1
3
8
6
7
* 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
CONFIGURATION
• From the factory, the RC-1500 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-1500 thermostat is designed to work with most single state conventional 4-wire HVAC systems (without
a transformer common). However, if the RC-1500 “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
Comp Stage 2 Relay
Comp Stage 1 Relay
Compressor Stage 2
9
5
4
1
3
8
6
7
(L)
(G)
(Y1)
(B)
(O)
(W2)
(C)
(RC)
UP
HVAC SYSTEM
THERMOSTAT
24VAC
CONTROL
TRANSFORMER
Ground Fault
Fan
Compressor Stage 1
Energized in Heat
Energized in Cool
Auxilirary Heat
24VAC Common*
24VAC "HOT"
Aux Heat Relay
Reversing Valve
Fan Relay
Fault Relay
(Y2)
10
Figure 10 – Connections for two speed heat pump thermostat
CONFIGURATION
• The “System Type” for this thermostat must be set to “Heat Pump” under “System Options”.
• The “Cool Stages” and “Heat Stages” settings must be configured under “Stage Settings”.
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 1° above the current temperature. Ensure that
the heat pump comes on, in heating mode. Press [HOLD] and select “On” to override Energy Efficient
Control. Stage 2 heat should come on.
6. Raise the desired heat setting 3°s above the current temperature. Auxiliary heat should come on.
7. After a few minutes, set the mode to “EM Heat”. Both stages of the heat pump should stop but the
auxiliary heat should remain on. Set the mode to “Off”. Ensure that the auxiliary heat goes off.
8. Press [HOLD] and select “Off” to enable Energy Efficient Control. Set the Mode to “Cool”. Lower
the desired cool setting 1° below the current temperature. Ensure that the heat pump comes on, in
cooling mode. Press [HOLD] and select “On”. Stage 2 cool should come on.
9. Set the mode to “Off”. Ensure that both stages of the cooling unit go off.
10. Press [HOLD] and select “Off” to enable Energy Efficient Control.
TWO SPEED HEAT PUMP (3 STAGE HEAT / 2 STAGE COOL)
WARNINGS AND CAUTIONS
•
WARNING: TO AVOID FIRE, SHOCK OR DEATH, turn off power at circuit
breaker or fuse and test that the power is off before wiring!
•
WARNING: TO AVOID SERIOUS PERSONAL INJURY OR DEATH, never touch uninsulated wires or
terminals unless the wiring has been disconnected at the network interface.
• 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.
• Use caution when installing or modifying communications wiring or components.
• SAVE THESE INSTRUCTIONS.
WEB
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