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

1

DELUXE
NON-PROGRAMMABLE
THERMOSTAT

9550

ELECTRICEHEAT PUMP

H

GAS

G

®

NeW

1 Heat / 1 Cool
with Auto Changeover

User's Manual

Quick Start
Installation

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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

!

• 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 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).

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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

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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.

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Figure 3

Figure 4

Mounting Holes

WYBO G

WIRING
OPENING

NON

HP