Robertshaw 9550 User Manual

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Application

The Robertshaw 9550 is a single-stage auto changeover thermostat designed to control 24 VAC gas or electric heating and cooling systems or single-stage heat pump. The 9550 requires the use of a common wire.

Features

• Auto changeover [deadband adjustable from 2°F to 8°F (1.0°C - 4.5°C)]

•Large back lit display

• Adjustable temperature differential

• Compressor short cycle protection

• Adjustable fan delay on cooling

• LED indication of system status

• Zone system compatible as a master thermostat

• Battery-free EEPROM memory retention

• Optional temperature limiting settings

• Fahrenheit/Celsius display option

• Gas/electric operation

• Adjustable from 45°F to 90°F (7°C - 32°C)

• Quick wire terminal block

DELUXE NON-PROGRAMMABLE THERMOSTAT

9550

ELECTRICEHEAT PUMP

GAS

NeW

1 Heat / 1 Cool with Auto Changeover

User's Manual

Quick Start Installation

110-1034

Page 2

Figure 1

IMPORTANT SAFETY INFORMATION WARNING:

•Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to the off position before installing, removing, cleaning, or servicing thermostat.

• Read all the information in this manual before installing or programming this thermostat.

• This is a 24 VAC low-voltage thermostat. Do not install on voltages higher than 30 VAC.

• All wiring must conform to local and national building and electrical codes and ordinances.

• Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will damage the thermostat and void the warranty.

Step 1: Replacing Existing Thermostat

1. Turn off power to heating and cooling system.

2. Remove cover from old thermostat to expose wires (Figure 1).

3. Disconnect wires one at a time from existing terminals. Use enclosed labels to mark existing wires. Refer to cross references in Table 1 if existing wiring does not directly match the labels.

Old Terminal New Label Description

R, V-VR or VR-R R 24 VAC, Return Y, Y1 or M Y Cooling Control O or R O Cool Active Reversing Valve BBHeat Active Reversing Valve F or G G Fan Control Relay C, X or B C 24 VAC, Transformer Common Side W1 or W W Heating Control

NOTE: THIS THERMOSTAT REQUIRES A 24V COMMON WIRE FOR PROPER OPERATION.

Table 1

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• If you have any questions about cross referencing the old terminal to the new label, reference your equipment installation manual, a licensed contractor, or call Robertshaw Technical Support at (800) 445-8299.

4. Remove existing thermostat base from wall.

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.

Step 2: Installing Model 9550 Thermostat

NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON

INSIDE WALL, FIVE FEET ABOVE THE FLOOR. DO NOT INSTALL BEHIND A DOOR, IN A CORNER, NEAR AIR VENTS, IN DIRECT SUNLIGHT, OR NEAR ANY HEAT OR STEAM GENERATING FIXTURES. INSTALLATION AT THESE LOCATIONS WILL AFFECT THERMOSTAT OPERATION.

1. Turn power off to the heating and cooling systems.

2. Place AUTO-HEAT-OFF-COOL in OFF position (Figure 2).

3. Place -ON-AUTO switch into AUTO position (Figure 2).

Figure 2

SETTING OR CHANGING THE SETPOINT TEMPERATURE:

1.Press or button. Display will show SET and the current temperature setpoint.

2. Press or button to adjust temperature setpoint.

3. After completing the change, the display will return to the current room temperature after a few seconds.

CHANGING THE TEMPERATURE DIFFERENTIAL, DEAD BAND, AND RESIDUAL COOL:

The temperature differentials are factory set at 1˚F and 2˚F for 1STand 2NDstages respectively. The dead band for Autochangeover is set at 3˚F. To change settings:

1.Press the and buttons at the same time and hold for 1 second. Display will indicate: DIFFERENTIAL 1ST.

2. Press either the or button to adjust the 1st stage differential between 0.5˚F – 3˚F (0.5˚C - 1.5˚C).

3. Either wait five seconds or press the button. The display

will indicate: DIFFERENTIAL 2ND.

4.Press either the or button to adjust 2nd stage differential between 1˚F – 6˚F (1˚C - 3˚C).

5. Either wait five seconds or press the button. The display

will indicate: DEADBAND.

6.Press either the or button to adjust the dead band between 3˚F – 6˚F (1.5˚C - 3˚C).

7.Either wait five seconds or press the button.The fan icon and ON will be displayed.

8. Press either the or button to adjust the Residual Cool fan delay between 0, 30, 60, or 90 seconds.

9.The display will return to the current room temperature after a few seconds.

Item

9555

120-1523

Maple Chase Company www.maplechase.com Tech Service: 1-800-445-8299 M-F 7:30 a.m. - 5:30 p.m. CST

MADEINMEXICO

Page 4

4. Remove the cover using a coin or screwdriver (Figure 3). Set aside.

5. Place thermostat against the wall at desired location. Make sure wires will feed through opening (Figure 4) on base of thermostat.

6. Mark placement of mounting holes (Figure 4). Set base aside.

7. If mounting on drywall, tap plastic anchors into wall.

NOTE: ENCLOSED PLASTIC ANCHORS DO NOT REQUIRE A

DRILLED HOLE FOR DRYWALL.

8. Drill the marked holes using a 3/16" drill bit if mounting on a surface other than drywall.

9. Align base with plastic anchors and feed wires through opening.

10. Secure base to wall with supplied screws.

NOTE: THE THERMOSTAT WILL MOUNT HORIZONTALLY

ON A SINGLE GANG JUNCTION BOX.

11. Strip end of wires 5/16” if needed.

Figure 3

Figure 4

Mounting Holes

WYBO G

WIRING OPENING

NON

Page 5

12. Terminal screws are already loose and ready for wire insertion. Insert wires into terminal strip (Figure 5) matching the label to the corresponding terminal (see Wiring Diagrams below). Tighten screws.

13. Make sure wire connections are secure.

14. Push access wire back through opening.

Figure 5

Wiring Diagrams for 9550

Y B

O G

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15. If using a single stage heat pump system, set switch to HP.

16. Set the GAS/ELEC switch to either GAS for a gas/oil heating

system or ELEC for an electric heating system.

17. A temperature limiting jumper has been included in this thermo-

stat. Cutting this jumper (J3) limits the heating setpoint to no greater than 72°F and the cooling setpoint to no lower than 78°F (Figure 7).

Figure 6

TERMINAL LEGEND - 9550

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 transformer

W First stage heat connection Yes* Energizes on a call for

heat

Y Second stage heat connection No Energizes on a call for

cooling

G Indoor fan connection Yes** Energizes with W (ELECTRIC

mode only) and Y or with FAN option switched to the ON position

O Cool active reversing valve No*** Energizes when in the

connection COOL mode

B Heat active reversing valve No*** Energizes when in the

connection 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 W and Y.

** A heat only gas system typically will not require the G terminal connection unless a separate

indoor blower is installed.

***Most heat pump systems will have a cool active OR

a heat active reversing valve. Use the

appropriate terminal.

Heat Pump Switch

WYBO G

NON HP

GAS/ELECTRIC

Switch

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18. Replace thermostat cover by snapping into place.

19. Turn on power to system. Test thermostat as described in the fol-

lowing section.

Step 3: Testing the Thermostat

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.

1. Place the AUTO-HEAT-OFF-COOL switch into

the COOL position.

2. Press the  button until the temperature setting

is at least 3 degrees below the room temperature. The air conditioning system should turn on within a few seconds.

NOTE: ONCE THE THERMOSTAT TURNS OFF WHEN IN THE COOL MODE, A

BUILT IN 5-MINUTE DELAY PREVENTS THE SYSTEM FROM TURNING ON AGAIN. THIS PROTECTS THE COMPRESSOR. NO ADDITIONAL TIME DELAY RELAY IS REQUIRED. TO OVERRIDE THE 5MINUTE DELAY FOR INSTALLATION, PRESS THE RESET BUTTON.

Cut the J3 jumper

Figure 7

to enable temperature limiting

WYB OG

NON HP

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3. Put the AUTO-HEAT-OFF-COOL switch into

the OFF position. The air conditioning system should turn off.

4. Put the AUTO-HEAT-OFF-COOL switch into

the HEAT position.

5. Press the button until the temperature

setting is at least 3 degrees above room temperature. The heating system should turn on. The fan may not turn on immediately, depending on the fan delay built into the furnace.

6. Put the AUTO-HEAT-OFF-COOL switch into

the OFF position. The heating system should turn off. The fan may continue to run for a short period of time.

7. Put the -ON-AUTO switch into the ON

position. The blower fan should turn on.

8. Put the -ON-AUTO switch into the AUTO

position. The blower fan should turn off.

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Step 4: Customizing the Thermostat

◆ Settings

System

Cool: The thermostat controls the cooling. Off: The heating and cooling systems are off. Heat: The thermostat controls the heat. AUTO:The thermostat automatically selects heat or cool depending

on the temperature.

Fan

Auto:Equipment controls the fan. On: The fan operates continuously.

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 (22.0°C). After putting the system switch in heat, cool, or auto, press either the  or button to adjust the temperature setting up or down.

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). 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.

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 (1.5°C)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).

Figure 8

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◆ Changing Fahrenheit (F) to Celsius (C),

Temperature Differential, Deadband, and Residual Cool

The temperature differential is factory set at 1°F (0.5°C). The deadband for auto changeover is set at 3°F (1.5°C). To change settings:

1. The thermostat is preset to display the temperature in degrees Fahrenheit (US models) or degrees Celsius (Canadian models). The temperature display can be changed.

2. Press and hold both the  and buttons for three seconds. The display will read F or C. Release the buttons. Press the  or button to switch the display.

3. After three seconds the display will switch to the differential setting. The display will read DIFFERENTIAL 1st.

4. The temperature differential is factory set at 1°F (0.5°C). Press the

 or



to adjust the differential up or down.

5. Either wait three seconds or press the button. The display will indicate: AUTOCHANGE DEADBAND.

6. Press either the  or button to adjust the deadband between

2.0°F - 8.0°F (1.0°C - 4.5°C).

7. Either wait five seconds or press the button. The fan icon and ON will be displayed.

8. Press either the  or button to adjust the residual cool fan delay between 0, 30, 60, or 90 seconds.

9. The display will return to the original room temperature display after a few seconds.

◆ LED Indicators

The Robertshaw 9550 uses three LED indicators (in addition to icons on the LCD display) to indicate 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. The middle amber LED indicates the fan is running.

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◆ 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.

Step 5:Troubleshooting

Symptom Remedy

Check wiring (see Installation section).

If problems with thermostat cannot be resolved, call:

Technical Support: (800) 445-8299

Monday-Friday 7:30 AM - 5:30 PM CST

RESET Switch

WYBOG

NON HP

Thermostat turns system on and off too frequently.

Increase temperature differential (see Changing the Temperature Differential section).

System fan does not operate properly.

Thermostat does not display proper room temperature.

Check F/C (Fahrenheit/Celsius) settings (see Changing Fahrenheit (F) to Celsius (C) section).

Move fan option switch to either gas or electric, to match system (see Installation section).

Thermostat does not turn on system.

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Two Year Limited Warranty

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:

Invensys 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