Robertshaw 9555 User manual

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.
Features
•Multi-stage control
•Auto changeover [deadband adjustable from 2°F to 8°F (1.0°C - 4.5°C)]
•Large back lit display
•Adjustable 1ST and 2ND stage 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
1
9555
ELECTRIC
E
GAS
G
®
NeW 2 Heat / 2 Cool
with Auto Changeover
User's Manual
Quick Start
Installation
W
A
R
R
A
N
T
Y
2
T
W
O
Y
E
A
R
DELUXE
NON-PROGRAMMABLE
THERMOSTAT
110-975D
110-975D En.qxd 5/13/03 2:43 PM Page 1 (Black plate)

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. 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
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)
BBReversing 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.
2
Figure 1
Table 1
!
110-975D En.qxd 5/13/03 2:43 PM Page 2 (Black plate)

•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
[phone].
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 9555 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).
3
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
TM
110-975D En.qxd 5/13/03 2:43 PM Page 3 (Black plate)

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 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.
4
Figure 3
Mounting Holes
WIRING
OPENING
W1 Y1 B O G W2 Y2
NON HP
Figure 4
110-975D En.qxd 5/13/03 2:43 PM Page 4 (Black plate)

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.
5
O
Y1
W1 BGW2 Y2
W1
Wiring Diagrams for 9555
Typical 1 heat / 1 cool system
Typical 1 stage heat / 2 stage cool system
Typical 2 stage heat / 1 stage cool system
Typical 2 stage heat / 2 stage cool system
9555 WIRING SAMPLE #1
9555 WIRING SAMPLE #2
9555 WIRING SAMPLE #3
9555 WIRING SAMPLE #4
B O W2 Y2C R W1 Y1 G
B O W2 Y2C R W1 Y1 G
B O W2 Y2C R W1 Y1 G
B O W2 Y2C R W1 Y1 G
Figure 5
110-975D En.qxd 5/13/03 2:43 PM Page 5 (Black plate)

15. Set the GAS/ELEC switch to either GAS for a gas/oil heating sys-
tem or ELEC for an electric heating system.
16. 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).
6
GAS/ELECTRIC
Switch
W1 Y1 B O G W2 Y2
NON HP
Figure 6
TERMINAL LEGEND - 9555
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
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 connection Yes* Energizes on a call for first
stage of heating
W2 Second stage heat connection No Energizes on a call for
second stage heating (aux.)
GIndoor fan connection Yes Energizes with W1, W2, Y1
and Y2 terminals or with
FAN option switched to the
ON position
OAccessory** No Energizes when in the in
COOL mode
BAccessory** 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.
110-975D En.qxd 5/13/03 2:43 PM Page 6 (Black plate)

7
17. Replace thermostat cover by snapping into place.
18. 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 THERMO-
STAT 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
W1 Y1 B O G W2 Y2
Figure 7
!
110-975D En.qxd 5/13/03 2:43 PM Page 7 (Black plate)

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.
8
110-975D En.qxd 5/13/03 2:43 PM Page 8 (Black plate)

9
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°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) 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 set-
tings. 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 tem-
perature 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).
Figure 8
110-975D En.qxd 5/13/03 2:43 PM Page 9 (Black plate)

10
◆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:
1. The thermostat is preset to display the temperature in degrees
Fahrenheit (U.S. models) or degrees Celsius (Canadian models). The
temperature display can be changed. Press and hold both the and
buttons for three seconds. The display will read For C. Release the
buttons. Press either the or button to change the display.
2. After three seconds, the display will switch to the differential
settings. The display will read DIFFERENTIAL 1ST.
3. The temperature differential is factory set at 1°F (0.5°C) for the first
stage. Press either the or button to adjust the 1ST stage
differential between 0.5°F - 3°F.
4. Either wait three seconds or press the button. The display will
indicate: DIFFERENTIAL 2ND.
5. The 2nd stage differential is factory set at 2°F (1.5°C). Press either
the or button to adjust the 2nd stage temperature differential
between 1°F - 6°F (1°C - 3°C).
6. Press the  or button to adjust the 2nd stage timed differential
between 5 to 40 minutes. Either wait 5 seconds or press the
button.
7. Either wait three seconds or press the button. The display will
indicate: AUTOCHANGE DEADBAND.
8. Press either the or button to adjust the deadband between
2°F - 8°F (1.0°C - 4.5°C).
9. Either wait three seconds or press the button. The fan icon and
ON will be displayed.
10. Press either the or button to adjust the residual cool fan delay
between 0, 30, 60, or 90 seconds.
11. The display will return to the original room temperature display after
a few seconds.
◆LED Indicators
The Robertshaw 9555 uses three LED indicators (in addition to icons on
the LCD display) to indicate functionality of the thermostat. When illumi-
nated, 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).
110-975D En.qxd 5/13/03 2:43 PM Page 10 (Black plate)

◆Backlit Display
This thermostat is equipped with a backlight to make nighttime tempera-
ture 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
11
If problems with thermostat cannot be resolved, call:
Technical Support: [phone]
Monday-Friday 7:30 AM - 5:30 PM CST
RESET Switch
W1 Y1 B O G W2 Y2
NON HP
Thermostat does not turn on system. Check wiring (see Installation
section).
Increase temperature differential
(see Changing the Temperature
Differential section).
Thermostat turns system on and
off too frequently.
System fan does not operate
properly.
Move fan option switch to either
gas or electric, to match system
(see Installation section).
Check F/C (Fahrenheit/Celsius)
setting. See Changing Fahrenheit
(F) to Celsius (C).
Thermostat does not display
proper room temperature.
Call technical support.
Er on display
110-975D En.qxd 5/13/03 2:43 PM Page 11 (Black plate)

Two Year Limited Warranty
Climate Controls Americas warrants to the original contractor
installer, or to the original consumer user, each new Robertshaw thermo-
stat 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
©2003 Climate Controls Americas 110-975D
Climate Controls Americas
191 E. North Avenue
Carol Stream Illinois 60188
United States of America
12
110-975D En.qxd 5/13/03 2:43 PM Page 12 (Black plate)