PROSTAT PRS3110 & PRS3210 Non-Programmable Thermostats
User Manual
This manual provides information for the PROSTAT PRS3110 (Single Stage Heat / Cool Conventional and Heat Pump) and PRS3210 (Up to 2 Heat / 1 Cool Conventional and Heat Pump) thermostats. The model number is located on the back of the thermostat.
Warning: Turn off power to the heating or cooling equipment before installation.
Attention: For installation by experienced service technicians only.
Read all instructions before proceeding.
This thermostat requires 24 Volt AC Power or two (2) properly installed "AA" Alkaline batteries for proper operation. When connecting 24 Volt AC Power, the batteries may be installed as a backup. Thermostat installation and all components of the system shall conform to Class II Circuits per NEC code. For use only as described in this manual. Any other use will void warranty.
1 Specifications
Compatibility:
- Single stage heat / cool conventional and heat pump systems
- Conventional systems up to 2 heat / 1 cool (PRS3210 only)
- Single compressor heat pump systems with an auxiliary heat stage (PRS3210)
- 250 - 750 millivolt heat only systems
Electrical and Control Specifications:
- Electrical Rating: 24 Volt AC
- 1 amp maximum load per terminal
- AC Power: 18 - 30 Volts AC
- DC Power: 3.0 Volt DC (2 "AA" Alkaline Batteries Included)
- Control Range: 45°–90°F (7°–32°C)
- Temperature Accuracy: +/- 1°F (+/- 0.5°C)
Terminations:
- PRS3110: Rc, Rh, O, B, Y1, W1, G, C
- PRS3210: Rc, Rh, O, B, Y1, E/W1, G, W2, C
2 Installation
Warning: Disconnect power before beginning installation.
Thermostat Location:
Install the thermostat approximately 5 feet (1.5 m) above the floor in an area with good air circulation and an average room temperature. Avoid locations affected by drafts, dead air spots, hot or cold air ducts, direct sunlight, appliances, concealed pipes, chimneys, and outside walls.
A diagram shows an ideal location for a thermostat, avoiding direct airflow from a vent or sunlight from a window. It also shows a vent on the floor emitting heat waves.
Install your new PROSTAT thermostat in 5 basic steps:
- Install the Sub-Base
- Provide Power
- Connect Your Wires
- Set Installer Switches
- Attach Thermostat to Sub-Base
1. Install the Sub-Base:
Remove the sub-base from the thermostat body. Mount the sub-base using the provided pilot holes and anchors for drywall or plaster.
A diagram illustrates mounting the sub-base to a wall, showing screw placement and wire entry.
2. Provide Power:
- For 24 Volt AC power, connect the common side of the transformer to the 'C' terminal on the thermostat sub-base.
- For primary or back-up power, insert two (2) "AA" alkaline batteries into the battery compartment, ensuring correct polarity (+/-).
3. Connect Your Wires:
Conventional Systems
Typical Wiring Configurations
NOTE: The "Installer Switch" option will be configured in the next step.
Heat Only or Millivolt:
Set Installer Switch to CONV
| Terminal | Connection |
|---|---|
| Rh | Power Connection |
| W | Heat Relay (appears as W1/E on PRS3210) |
| G | Fan Relay [note 4] |
| C | 24 Volt AC Transformer Common [note 1] |
1 Heat / 1 Cool Single or Dual Transformer:
Set Installer Switch to CONV
| Terminal | Connection |
|---|---|
| Rh | 24 Volt AC Power (heating transformer) [note 2] |
| Rc | 24 Volt AC Power (cooling transformer) [note 2] |
| W1 | Heat Relay (appears as W1/E on PRS3210) |
| Y1 | Compressor Relay |
| G | Fan Relay |
| C | 24 Volt AC Transformer Common [note 1, 3] |
2 Heat / 1 Cool Single or Dual Transformer (PRS3210 Only):
Set System Type to CONV
| Terminal | Connection |
|---|---|
| Rh | 24 Volt AC Power (heating transformer) [note 2] |
| Rc | 24 Volt AC Power (cooling transformer) [note 2] |
| W1 | Heat Relay Stage 1 |
| W2 | Heat Relay Stage 2 |
| Y1 | Compressor Relay Stage 1 |
| G | Fan Relay |
| C | 24 Volt AC Transformer Common [note 1, 3] |
NOTES - Conventional Systems:
[1] If batteries are installed, the 24 Volt AC common connection is optional.
[2] Remove factory-installed jumper for dual transformer systems.
[3] In dual transformer systems, the transformer common must come from the cooling transformer.
[4] If needed for system. Provide disconnect and overload protection as required.
Heat Pump Systems
Typical Wiring Configurations
NOTE: The "Installer Switch" option will be configured in the next step.
1 Heat / 1 Cool - No Auxiliary Heat:
Set Installer Switch to HP
| Terminal | Connection |
|---|---|
| Rh | 24 Volt AC Power |
| Rc | Connected to Rh with supplied Jumper Wire |
| O or B | Changeover Valve [note 2] |
| Y1 | Compressor Relay |
| G | Fan Relay |
| C | 24 Volt AC Transformer Common [note 1] |
2 Heat / 1 Cool - Including Auxiliary Heat (PRS3210 Only):
Set Installer Switch to HP
| Terminal | Connection |
|---|---|
| Rh | 24 Volt AC Power |
| Rc | Connected to Rh with supplied Jumper Wire |
| O or B | Changeover Valve [note 2] |
| Y1 | Compressor Relay (1st stage heating/cooling) |
| W2 | Auxiliary Heat Relay (2nd stage heating) [note 3] |
| W1/E | Emergency Heat Relay [note 3] |
| G | Fan Relay |
| C | 24 Volt AC Transformer Common [note1] |
NOTES - Heat Pump Systems:
[1] If batteries are installed, the 24 Volt AC common connection is optional.
[2] Select 'O' for cool active or 'B' for heat active.
[3] Install a field-supplied jumper between the W2 and 'E' terminals if there is no separate emergency heat relay installed.
Provide disconnect and overload protection as required.
4. Set Installer Switches:
| Switch | Factory Default | Setting Options | Comments |
|---|---|---|---|
| CONV / HP | CONV | CONV | Select for conventional systems |
| HP | Select for heat pump systems | ||
| F / C | F | F | Select for Fahrenheit temperature scale |
| C | Select for Celsius temperature scale | ||
| HE / HG | HG | HG | Select for gas heat |
| HE | Select for electric heat |
NOTE: The reset button should be pressed after making any changes to the installer switches.
5. Attach Thermostat to Sub-Base:
- Line up the thermostat body with the sub-base.
- Carefully push the thermostat body against the sub-base until it snaps into place.
- Insert quick reference card into slot on top of thermostat.
3 Setting User Options
Advanced User Options:
User options allow customization of thermostat features. Most users will not need to make changes. To access the User Options menu, hold down both the ▲ and ▼ buttons for approximately 3 seconds until the screen displays the first User Option. Press ▲ or ▼ to change the setting. Press both ▲ and ▼ together to advance to the next User Option. The thermostat returns to normal mode after the last option or 15 seconds of inactivity.
Table of User Options:
| No. | User Options | Factory Default | Setting Options | Comments |
|---|---|---|---|---|
| 1 | 1st stage differential | 0.5 | 0.5, 1.0 or 2.0 | Select a 1st stage temperature differential of 0.5°, 1° or 2°F (0.2°, 0.5° or 1°C) |
| 2 | 2nd stage differential (PRS3210 only) | 2.0 | 1.0, 2.0, 3.0, 4.0, 5.0 or 6.0 | Select a 2nd stage temperature differential of 1°, 2°, 3°, 4°, 5° or 6°F (0.5°, 1°, 1.5°, 2°, 2.5° or 3°C) |
Detailed Explanation of User Options: Temperature Differential (User Option 1 and 2)
The differential setting is the temperature control range. A smaller setting provides tighter temperature control and comfort. The 2nd stage differential is only for systems with a second stage of heating (auxiliary heat).
4 Operating Your Thermostat
Setting the System Control Mode:
Select the system mode by moving the SYSTEM switch:
- COOL: Only your cooling system will operate.
- OFF: Heating and cooling systems are off.
- HEAT: Only your heating system will operate.
A diagram shows the SYSTEM switch in various positions.
Additional Switch Position (Model PRS3210 Only):
- EMER: Operates a backup heat source (Emergency Heat) for heat pump systems only.
NOTE: If your model PRS3210 was configured for a conventional system (CONV), the "NO EMER SET" message will flash if EMER is selected.
A diagram shows the SYSTEM switch with an additional EMER position.
Setting the Fan Control Mode:
Select the fan mode by moving the FAN switch:
- AUTO: The system fan runs only when heating or cooling is active.
- ON: The system fan stays on continuously.
A diagram shows the FAN switch in AUTO and ON positions.
Temperature Adjustment:
Press the ▲ or ▼ button to adjust the current setpoint temperature.
Status Indicators:
Status indicators appear in the display:
- HEAT ON: Indicates your heating system is running.
- COOL ON: Indicates your cooling system is running.
Diagrams show the display indicating HEAT ON and COOL ON.
Additional Status Indicators (Model PRS3210 Only):
- AUX: Indicates the auxiliary stage of heating is running (Multi-Stage Systems only).
- EMER: Indicates the emergency heating system is running (Heat Pump Systems only).
Resetting the Thermostat
This thermostat has a reset button to erase all user settings. Use a small object (like a toothpick or paperclip) to gently press the button inside the small hole labeled "reset" on the front of the thermostat housing.
5 Additional Operation Features
Compressor Protection:
This thermostat includes an automatic compressor protection delay to prevent damage from short cycling. This feature activates a short delay after turning off the system compressor.
6 Thermostat Maintenance
Changing the Batteries:
If batteries are installed and become low, a low battery indicator will appear. Change batteries immediately:
- Gently pull the thermostat body from the base.
- Remove old batteries and replace with new ones, ensuring correct polarity (+/-).
- Gently push the thermostat body back onto the base.
NOTE: Replace batteries annually or if the thermostat will be unattended for an extended period.
Thermostat Cleaning:
Never spray liquid directly on the thermostat. Use a soft, damp cloth to wipe the outer body. Do not use abrasive cleaners.
Store this manual for future reference.
5 Year Limited Warranty
PROPARTS warrants PROSTAT thermostats against defects in material or workmanship for five years from the original date of purchase by a professional service technician. This warranty does not cover batteries, or damage resulting from accident, alteration, neglect, misuse, improper installation, or failure to follow instructions. PROPARTS will repair or replace, at its option, any defective thermostat returned postage prepaid within the warranty period, with proof of purchase and a description of the malfunction. This warranty does not cover removal or re-installation costs.
This warranty provides specific legal rights, and other rights may vary by state or province. For warranty service, visit your nearest PROPARTS facility.
Technical Assistance: 855-445-2466 (U.S.)
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