Robertshaw 9550 User manual

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

ELECTRIC

HEAT PUMP

GAS

NeW 1 Heat / 1 Cool

with Auto Changeover

User's Manual

Quick Start

Installation

110-1034

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 program-

ming 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. Removecoverfromoldthermostattoexposewires (Figure 1).

3. Disconnectwiresoneatatimefromexistingterminals.Useenclosedlabels

tomarkexistingwires.RefertocrossreferencesinTable1ifexistingwiring

doesnotdirectlymatchthelabels.

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

•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 ques-

tions, 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

1ST and 2ND stages respectively. The dead band for Auto-

changeover 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 differ-

ential 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 differen-

tial 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

MADE IN MEXICO

4. Removethecoverusingacoinorscrewdriver(Figure3).Setaside.

5. Placethermostatagainstthewallatdesiredlocation.Makesurewires

willfeedthroughopening (Figure4)onbaseofthermostat.

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 sur-

face 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

Mounting Holes

WIRING

OPENING

WYBOG

NON HP

Figure 4

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.

WBG

Figure 5

Wiring Diagrams for 9550

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).

Heat Pump

Switch

GAS/ELECTRIC

Switch

WYBOG

NON HP

Figure 6

TERMINAL LEGEND - 9550

TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION

C24VAC common connection Yes For input of 24VAC common

side of transformer

R24VAC hot connection Yes For input of 24VAC hot side

of transformer

WFirst stage heat connection Yes* Energizes on a call for

heat

YSecond stage heat connection No Energizes on a call for

cooling

GIndoor fan connection Yes** Energizes with W (ELECTRIC

mode only) and Y or with

FAN option switched to the

ON position

OCool active reversing valve No*** Energizes when in the

connection COOL mode

BHeat 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.

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 OPER-

ATION. 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 CONDITION-

ING 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 TURN-

ING ON AGAIN. THIS PROTECTS THE COMPRESSOR. NO ADDI-

TIONAL TIME DELAY RELAY IS REQUIRED. TO OVERRIDE THE 5-

MINUTE DELAY FOR INSTALLATION, PRESS THE RESET BUTTON.

Cut the J3 jumper

to enable

temperature limiting

WYBOG

NON HP

Figure 7

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.

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 cool-

ing is 78°F (25°C), and for auto is 72°F (22.0°C). After putting the sys-

tem 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 differen-

tials, the deadband is used only during the AUTO mode. In the AUTO

mode, the thermostat will automatically cycle either the heating or cool-

ing 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 tem-

perature 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

◆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 but-

ton 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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