Robertshaw RS2110 Thermostat Instruction Manual

Manual Robertshaw RS2110 Thermostat Instruction Manual

Robertshaw RS2110 Thermostat Instruction Manual

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Robertshaw RS2110 Thermostat

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Robertshaw RS2110 Instructions

Here we offer the Robertshaw RS2110 Thermostat manual completely free and in English. We have cataloged this manual in the Thermostats section on Manualverse, and it has been rated by 1 users with an average rating of 5. If you have any specific questions about Robertshaw RS2110 Thermostat, we suggest checking the Frequently Asked Questions (FAQs) section of this manual.


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Robertshaw RS2110 Thermostat Specifications

Specification Detail
Model Series RS2110
Thermostat Type Digital Non-Programmable
System Compatibility One Stage Heat/Cool, Standard Heat Only, Standard Central AC, Gas/Oil Heat, Electric Furnace, Hydronic (2 Wires)
Heat Pump Compatibility Yes (without Auxiliary Heat), Yes (with Auxiliary/Emergency Heat)
Millivolt Compatibility Yes (Floor or Wall Furnaces)
Power Source 24 VAC or 2 x 1.5V AA Alkaline Batteries
Operating Voltage 24 VAC (Do not exceed 30 VAC)
Set Temperature Range 45°F to 90°F (7°C to 32°C)
Display Temperature Range 30°F to 99°F (0°C to 37°C)
Heat Mode Auto Cut-Off Above 95°F (35°C)
Cool Mode Auto Cut-Off Below 45°F (7°C)
Compressor Protection 4-minute delay between cycles
Filter Monitor Alerts after 400 hours of system run time
Battery Replacement Interval At least every 18-24 months
Mounting Hardware Two #8 slotted screws, two wall anchors
Drill Bit Size 3/16" for mounting holes
Warranty Two (2) Year Limited Warranty
Incompatible Systems Split Transformer Systems, 3-Wire Hydronic (110/220 Volts)

Robertshaw RS2110 Thermostat Details

The Robertshaw RS2110 thermostat boasts an improved LCD display, designed for effortless viewing and temperature adjustments. This clear screen provides essential information at a glance, including ambient temperature, current setpoint, and the operational status of your HVAC system through intuitive icons. When active, these icons, such as the flame or snowflake, will blink, offering real-time feedback. Extreme room temperatures outside the normal display range are indicated by "HI" or "LO", ensuring you are always aware of your environment.

Navigating the RS2110 is straightforward, thanks to its user-friendly controls. Dedicated Up and Down arrows allow for precise temperature setting and menu navigation. A convenient Reset button quickly restores factory defaults, while a secure door latch protects the battery compartment. The thermostat also features distinct System and Fan switches, enabling easy selection between COOL, OFF, or HEAT modes, and automatic or continuous fan operation, respectively. Installation is further simplified by a quick wire terminal block, utilizing sturdy clamps for fast, screw-less connections.

Beyond basic operation, the RS2110 offers several configurable features to tailor its performance to your needs. Users can easily switch between Fahrenheit and Celsius temperature scales. The First Stage Differential setting allows adjustment of the temperature overshoot before the system calls for heating or cooling, enhancing comfort. An Offset function provides the ability to fine-tune ambient temperature readings. Accessing this Configuration Menu is simple: just set the System switch to OFF and simultaneously press the UP and DOWN arrows for three seconds.

The RS2110 prioritizes system longevity and maintenance. It incorporates automatic compressor short cycle protection, imposing a 4-minute delay between heating or cooling cycles. This critical safeguard prevents damage to your compressor from rapid cycling. Furthermore, the Filter Monitor feature tracks system run time and conveniently flashes "Check FLtr" after 400 hours, reminding you to change or clean your air filter for optimal performance and energy efficiency. Resetting this reminder is as easy as holding the UP and DOWN arrows together.

Operating on either 24 VAC or two AA batteries, the thermostat ensures continuity. If 24 VAC power fails, the batteries act as a backup, preserving current settings – although the heating/cooling system will not operate without main power. A flashing battery symbol on the display provides timely notification for battery replacement, preventing unexpected shutdowns. Important safety warnings throughout the manual emphasize proper installation by a qualified technician, the necessity of turning off power, and avoiding voltages higher than 30 VAC, mitigating risks of electrical shock or fire. The device itself is mercury-free, supporting responsible disposal.

Frequently Asked Questions (FAQs)

Can't find the answer you need? Here are some frequently asked questions about the Robertshaw RS2110 Thermostat, and we answer them below.


What power source does the Robertshaw RS2110 thermostat use?
The RS2110 operates on either 24 VAC power or two 1.5V AA alkaline batteries. If 24 VAC is present, batteries serve as a backup.

How do I change the temperature scale between Fahrenheit and Celsius?
Set the System switch to OFF, then simultaneously press the UP and DOWN arrows for three seconds to enter the Configuration Menu. Use the DOWN arrow to navigate to the "Temperature Scale F/C" option, and the UP arrow to change the setting.

What does the 'Check FLtr' message mean?
The "Check FLtr" message indicates that the thermostat's Filter Monitor has detected 400 hours of system run time. This is a reminder to check, clean, or replace your system's filter for optimal performance.

How do I reset the 'Check FLtr' message?
To reset the filter monitor, press and hold the UP and DOWN arrows together until "Check FLtr" no longer displays on the screen. This will reset the counter to zero.

What is compressor short cycle protection?
This is a built-in safety feature that prevents damage to your HVAC compressor. After the heating or cooling system shuts off, the thermostat enforces a 4-minute delay before it can be restarted, protecting the compressor from rapid cycling.

My display is dim or blank. What should I do?
A dim or blank display usually indicates weak or dead batteries. You should replace the two AA alkaline batteries immediately. If 24 VAC power is also absent, the system will not operate without functional batteries.

The thermostat reads 'E1' or 'E2'. What do these error codes mean?
"E1" indicates a defective temperature sensor, meaning the unit needs to be replaced. "E2" means the System switch is in the wrong position; simply move it to the correct setting (COOL, OFF, or HEAT).

Can the RS2110 be used with a heat pump system?
Yes, the RS2110 is compatible with heat pump systems, both with and without auxiliary/emergency heat, as well as standard heat and cooling systems.

What is the recommended interval for replacing the batteries?
The manufacturer recommends replacing the batteries at least every 18-24 months to ensure proper operation. The thermostat will display a low battery icon when replacement is needed.

Can I use this thermostat with a 3-wire hydronic (hot water) zone heat system?
No, the RS2110 is NOT compatible with 3-wire hydronic (hot water) zone heat systems that operate on 110/220 Volts. It works with 2-wire hydronic systems.

What is the 'First Stage Differential' setting for?
The First Stage Differential controls the amount of temperature overshoot allowed before the thermostat calls for heating or cooling, helping to maintain optimal customer comfort by preventing rapid cycling around the setpoint.

Will my settings be lost if there's a power outage?
If 24 VAC power is interrupted, the installed AA batteries will maintain your current settings. However, if both the main power fails AND the batteries are dead, the settings will revert to factory defaults upon power resumption, and you will need to reprogram.

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