Application
The Robertshaw 9555 is a multi-stage auto changeover thermostat designed to control 24 VAC gas or electric two-stage heating and two-stage cooling systems. The 9555 requires the use of a common wire.
WARNING:
Old Terminal | New Label | Description |
C, X or B | C | 24 VAC, Transformer Common Side |
R, V-VR or VR-R | R | 24 VAC, Return |
W1 or W | W1 | 1st Stage Heating Control |
Y, Y1 or M | Y1 | 1st Stage Cooling Control |
O or R | O | Reversing Valve (Cooling Mode) |
B | B | Reversing Valve (Heating Mode) |
F or G | G | Fan Control Relay |
Y2 | Y2 | 2nd Stage Cooling Control |
W2 or W-U | W2 | 2nd Stage Heating Control |
NOTE: THIS THERMOSTAT REQUIRES A 24V COMMON WIRE FOR PROPER OPERATION.
Recycling Thermostat
If this thermostat is replacing a thermostat that contains mercury in a sealed tube, do not place your old thermostat in the garbage. Contact your local waste management authority for instructions regarding proper disposal of the thermostat. If you have any questions, call Robertshaw technical support at 1-800-445-8299.
NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, FIVE FEET ABOVE THE FLOOR. DO NOT INSTALL BEHIND A DOOR, IN A CORNER, NEAR AIRVENTS, IN DIRECT SUNLIGHT, OR NEAR ANY HEAT OR STEAM GENERATING FIXTURES. INSTALLATION AT THESE LOCATIONS WILL AFFECT THERMOSTAT OPERATION.
TERMINAL LEGEND – 9555 | |||
TERM | EQUIPMENT TO CONNECT | REQ? | TERMINAL FUNCTION |
C | 24VAC common connection | Yes | For input of 24VAC common side of transformer |
R | 24VAC hot connection | Yes | For input of 24VAC hot side of the transformer |
Y2 | Second stage cooling connection | No | Energizes on a call for second-stage cooling (aux.) |
Y1 | First stage compressor connection | Yes* | Energizes on a call for first stage of cooling |
W1 | First stage heat convection | Yes* | Energizes on a call for first stage of heating |
W2 | Second stage heat convection | No | Energizes on a call for second stage heating (aux.) |
G | Indoor fan connection | Yes | Energizes with W1, W2, Y1 and Y2 terminals or with FAN option switched to the ON position |
O | Accessory** | No | Energizes when in the in COOL mode |
B | Accessory** | No | Energizes when in the HEAT or EM modes |
* This thermostat can be used as a heat only or cool only thermostat therefore it is not always necessary to use both W1 and Y1.
** The O and B terminals are accessory terminals that typically are used for zoning applications.
WARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILL DAMAGE THE THERMOSTAT AND VOID YOUR WARRANTY.
CAUTION: DO NOT SWITCH SYSTEM TO COOL IF THE TEMPERATURE IS BELOW 50°F (10°C). THIS CAN DAMAGE THE AIR CONDITIONING SYSTEM AND CAUSE PERSONAL INJURY.
Settings System
Fan
Temperature
The default setpoint temperature for heating is 70°F (21°C), for cooling is 78°F (25°C) and for auto is 72°F (22°C). After putting the system switch in heat, cool, or auto, press either the
The display will return to the current room temperature five seconds after the last input and the new setpoint will be saved.
Temperature Differential and Deadband
The temperature differential is factory set at 1°F (0.5°C) for the 1ST stage differential and 2°F (1.0°C) for the 2ND stage. This means that whenever the room temperature changes by one degree Fahrenheit from the temperature setting, the system will turn on. If the system turns on too often, increase the temperature differential. The 2ND stage will turn on when the room temperature changes from the desired temperature by the sum of the 1ST and 2ND stage differential settings. The 2ND stage will also turn on if the temperature has not increased (or decreased in the event of cooling) for a period of twenty minutes. Although programmed at the same time as the temperature differentials, the deadband is used only during the AUTO mode. In the AUTO mode, the thermostat will automatically cycle either the heating or cooling system to maintain optimal comfort. The deadband is the minimum allowable temperature which must occur to switch to the opposite mode. For example, if the deadband is set at 3°F and the setpoint is set at 70°F, the thermostat will switch to cooling mode when the temperature reaches 73°F.
NOTE: IF THE TEMPERATURE LIMITING JUMPER J3 IS CUT (FIGURE 7), THE DEADBAND IS NOT ADJUSTABLE AND IS AUTOMATICALLY SET TO 6°F (3°C).
Changing Fahrenheit (F) to Celsius (C), Temperature Differential, Deadband, and Residual Cool
The temperature differential is factory set at 1°F (0.5°C) for the 1ST stage differential and 2°F (1.0°C) for the 2ND stage. The deadband for auto changeover is set at 3°F (1.5°C). To change settings:
LED Indicators
The Robertshaw 9555 uses three LED indicators (in addition to icons on the LCD display) to indicate the functionality of the thermostat. When illuminated, the right orange LED indicates that the thermostat is calling for heat. The left green LED indicates a call for cool. When the middle amber LED is illuminated, the thermostat is calling for second-stage heating or cooling. If this LED is illuminated too frequently during periods of moderate temperature, check the differential settings (see Temperature Differential and Deadband section).
Backlit Display
This thermostat is equipped with a backlight to make nighttime temperature adjustments quick and easy. Press the button to activate the backlight. The backlight will turn off after about 15 seconds of inactivity.
Reset
To reset the thermostat to factory preprogrammed conditions, press the RESET button located beneath the lower left corner of the display.
Symptom | Remedy |
Thermostat does not turn on system. | Check wiring (see Installation section). |
Thermostat turns system on and off too frequently. | Increase temperature differential (see Changing the Temperature Differential section). |
System fan does not operate properly. | Move fan option switch to either gas or electric, to match system (see Installation section). |
Thermostat does not display proper room temperature. | Check F/C (Fahrenheit/Celsius) setting. See Changing Fahrenheit (F) to Celsius (C). |
Er on display | Call technical support. |
If problems with the thermostat cannot be resolved, call:
Technical Support: (800) 445-8299
Monday-Friday 7:30 AM – 5:30 PM CST
Climate Controls Americas warrants to the original contractor installer, or to the original consumer user, each new Robertshaw thermostat to be free from defects in materials and workmanship under normal use and service for a period of two (2) years from date of purchase. This warranty and our liability does not apply to batteries or merchandise that has been damaged by misuse, neglect, mishandling, alterations, improper installation, or use in a way other than in accordance with Climate Controls Americas recommendations and instructions. Climate Controls Americas agrees to repair or replace at its option any thermostat under warranty provided it is returned within the warranty period, postage prepaid, with proof of the date of purchase. Cost of thermostat removal or reinstallation is not the responsibility of Climate Controls Americas.
Repair or replacement as provided under this warranty is the exclusive remedy of the consumer. Climate Controls Americas shall not be liable for any incidental or consequential damages for breach of any express or implied warranty on this product, or under any other theory of liability. Except to the extent prohibited by applicable law, any implied warranty of merchantability or fitness for a particular purpose on this product is limited to the duration of this warranty.
Some states do not allow the exclusion or limitation of incidental or consequential damages, or allow limitations on how long an implied warranty lasts, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
For warranty returns, send thermostat, shipping prepaid to Climate Controls Americas Warranty Claims Department 515 S. Promenade Corona, CA 91719
Climate Controls Americas
191 E. North Avenue
Carol Stream Illinois 60188
United States of America
Download Manual:
Robertshaw 9555 NON-PROGRAMMABLE THERMOSTAT User Manual
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