Robertshaw 9520 User manual

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 of the information in this manual before installing or pro-
gramming this thermostat
•This is a 24V AC low-voltage thermostat. Do not install on voltages
higher than 30V AC.
•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
1
2 Heat / 2 Cool
W
A
R
R
A
N
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Y
INTEGRATED COMFORT SOLUTIONS
™
DIGITAL
NON-PROGRAMMABLE
THERMOSTAT
9520
User’s Manual
Quick Start
Installation
110-733D
®
HEAT PUMP
H
!

Features
•Multi-stage heating and cooling control
•Zone system compatible as a master thermostat
•Multi-colored LED indicators for system status
•Low battery indicator.
•Fahrenheit/Celsius display option.
•Adjustable from 45°F (4°C) to 90°F (32°C).
•Accuracy within ± 1 degree.
•Adjustable temperature differential: 1-3 degrees F.
•Automatic heating shutdown if temperature exceeds 90°F (32(C).
Step 1: Replacing Existing Thermostat
1. Turn off power to heating and cooling system.
2. Remove cover of 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 refer-
ences in Table 1 if existing wiring does not directly match the labels.
•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 Tech Support [phone]
4. Remove existing thermostat base from wall.
2
Figure 1

Table 1
Old Terminal New Label Description
R, V-VR or VR-R R 24 VAC Return
Y, Y1 or M Y Stage 1 Cooling/Heating
Circuit
O or R O Reversing Valve
(Cooling Mode)
BBReversing Valve
(Heating Mode)
F or G G Fan Control Relay
Y2 Y2 2nd Stage Cooling
Circuit
W1 or W2 or W-U W2 2nd Stage Heating
Control
L or X L System Monitor LED
EEEmergency Heating
Circuit
C, X or B C 24 VAC Transformer
Common Side
*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 dis-
posal of the thermostat. If you have any questions, call Robertshaw tech-
nical support at 1-800-445-8299.
Step 2: Installing Model 9520 Thermostat
NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, 4-5 FEET ABOVE THE FLOOR.
DONOT INSTALL BEHIND A DOOR, IN A CORNER, NEAR AIR VENTS, IN DIRECT SUNLIGHT, OR NEAR ANY HEAT
OR STEAM GENERATING FIXTURES. INSTALLATION AT THESE PLACES WILL AFFECTS THERMOSTAT OPERATION.
1. Turn off power to the heating
and cooling systems.
2. Place COOL-OFF-HEAT-EM
in OFF position.
3
COOL-OFF-HEAT-EM AUTO - ON AUX
>
>
CHECK EMER
COOL-OFF-HEAT-EM
AUTO - ON

3. Place AUTO-ON switch into AUTO position.
4. Remove the cover using a coin or screwdriver
.
5. Place thermostat against the wall at desired location. Make sure
wires will feed through opening on base of thermostat.
6. Mark placement of mounting holes. See Figure 3.
Set base aside.
Figure 3
7. Drill the marked holes using a 3/16" drill bit. NOTE: Enclosed
plastic anchors do not require a drilled hole for drywall.
8. Tap plastic anchors into the wall.
9. Align base with plastic anchors and feed wires
through opening.
10. Secure base to wall with supplied screws.
4
Figure 2
Batteries NOT Required.
Mounting Holes

11. Terminal screws are loosened. Insert wires into terminal strip
(Figure 4) matching the label to the corresponding terminal
(see Wiring Diagrams below). Tighten screws.
5
Typical heat pump with cool active reversing valve and auxiliary/emergency heat.
OB
9520 WIRING SAMPLE #1
Y1 E G W2CLRY2
Typical heat pump with heat active reversing valve and auxiliary/emergency heat.
9520 WIRING SAMPLE #2
CLRY2Y1EGW2OB
Typical heat pump with heat active reversing valve and auxiliary/emergency heat.
Does not have separate wire for emergency heat (jump W2 & E).
9520 WIRING SAMPLE #3
BY1 E G W2CL ORY2
Jumper
Typical heat pump with cool active reversing valve, auxiliary/emergency heat
and second stage of cooling. System fault indicator connected (L terminal).
EG OB
9520 WIRING SAMPLE #4
CW2LRY2Y1
FIGURE 4

6
TERMINAL LEGEND - 9520
TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION
C24VAC common connection Yes For input of 24VAC common
side of transformer
LSystem fault indicator connection No For connection of system
fault indicator (if present)
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
Y1 First stage compressor connection Yes Energizes on a call for first
stage heating or cooling
EEmergency heat connection No* Energizes on a call for heat
in the EM mode only
GIndoor fan connection Yes Energizes with E, Y1, Y2 and
W2 terminals or with FAN
option switched to the ON
position
W2 Second stage heat connection No* Energizes on a call for
second stage of heat
(auxiliary heat)
OCool active reversing Yes** Energizes when in the in
valve connection COOL mode
BHeat active reversing Yes** Energizes when in the
valve connection HEAT or EM modes
*For systems using a backup heat source. If separate E terminal connection is not available,
jumper E and W2.
** Most heat pump systems will have a cool active OR a heat active reversing valve. Use the
appropriate terminal.

12. Put the °F/°C switch to either °F for Fahrenheit display
or °C for Celsius display (see Figure 5).
Figure 5
13. Replace cover on thermostat by snapping into place.
14. Turn on power to system . Test thermostat as described
in the following 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: DONOT 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 COOL-OFF-HEAT-EM
switch into the COOL position
2. Press the button until the
temperature setting is at east
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 5-
minute delay for installation, press the RESET button.
3. Put the COOL-OFF-HEAT-EM switch
into the OFF position. The air
conditioning system should turn off.
4. Put the COOL-OFF-HEAT-EM switch
into the HEAT position.
7
Batteries NOT Required.
°F/°C Switch
COOL-OFF-HEAT-EM
COOL-OFF-HEAT-EM
COOL-OFF-HEAT-EM
>

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 COOL-OFF-HEAT-EM 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 AUTO-ON switch to the
ON position. The blower fan should
turn on.
8. Put the AUTO-ON switch to
the AUTO position. The blower fan
should turn off.
Step 4: Customizing Your Thermostat
◆Setting or Changing
the Setpoint Temperature
Settings
System
Cool: The thermostat controls the cooling.
Off: The heating and cooling systems are off.
Heat: The thermostat controls the heat.
EM: The thermostat controls the second stage emergency heat.
Fan
Auto: Equipment controls the fan.
On: The fan operates continuously.
Temperature
The default setpoint temperature for heating is 70°F (21°C), and the
default setpoint temperature for cooling is 78°F (25°C). After putting
the system switch in heat, cool, or em, press either the or
button to adjust the temperature setting up or down.
8
AUTO - ON
>
COOL-OFF-HEAT-EM
AUTO - ON
>
>
COOL-OFF-HEAT-EM AUTO - ON AUX
>
>
CHECK EMER
C
>
>

◆Changing Temperature Differential
IMPORTANT: The temperature differential is factory set at 1 (1°). This
means that whenever the room temperature changes by one half of a
degree from the temperature setting, the system will turn on. If the system
turns on too often, increase the temperature differential.
1. Press both and buttons
at the same time and hold for one
second. The display will show:
2. Press either the or button
to adjust the temperature
differential up or down.
The display will return to the room temperature five
seconds after the last input.
◆Changing Fahrenheit (F) to Celsius (C)
The thermostat is preset to display the temperature in degrees Fahrenheit.
You may change the display to Celsius if desired.
1. Move the manual switch marked F (Fahrenheit) and C (Celsius)
located at the top center of the circuit board to the desired setting
(see page 7).
2. Press RESET button located to the right of the LCD display to register
the change.
The display will change to show the temperature in your desired tempera-
ture scale. To return the thermostat to its original setting, repeat steps 1
and 2 above.
◆LED Indicators
The LED indicators are used to indicate system activity. The AUX indicator
illuminates during a call for second stage heating. The auxiliary stages are
used to maintain comfort during extremes in weather conditions. If the
AUX LED is illuminated too frequently during periods of moderate temper-
ature, check the differential settings (see above).
The CHECK indicator is used to monitor system status. If the CHECK indi-
cator is illuminated, call your local HVAC service provider.
The EMER indicator is illuminated only when the system switch is moved
to the EM, emergency heat position. The EM position is used only when
the primary stage of heat is not functioning or requires service.
9
>
>
COOL-OFF-HEAT-EM AUTO - ON AUX
>
>
CHECK EMER
>
>
>
>

If problems with thermostat cannot be resolved, call:
Technical Support: [phone]
Monday-Friday 7:30-5:30 CST
10
Thermostat does not turn
on system. Check wiring. (See Installing Model 9520
Thermostat)
Check fuse. Replace with 2 amp
fuse if fuse has opened.
Thermostat turns on and
off too frequently. Increase temperature differential. (See Changing Temperature
Differential)
Display is blank, flashing,
or constant LO BAT. Replace batteries.
System fan does not
operate properly. Move fan option switch to either gas or electric, to match system.
(See Installing Model 9520
Thermostat)
Thermostat does not display
proper room temperature. Check F Fahrenheit/C Celsius switch located at top center of cir-
cuit board for proper position. If a
new selection is made, press
RESET button located to the right
of the LCD display.
Troubleshooting
Symptom Remedy

Five Year Limited Warranty
Maple Chase Company 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 five (5) years from date of purchase. This warranty
and our liability does not apply to batteries or the merchandise that has
been damaged, caused by misuse, neglect, mishandling, alterations,
improper installation, or use in a way other than in accordance with
Maple Chase Company recommendations and instructions.
Maple Chase Company 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 ther-
mostat removal or reinstallation is not the responsibility of Maple Chase
Company.
Repair or replacement as provided under this warranty is the exclusive
remedy of the consumer. Maple Chase Company 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 limit-
ed to the duration of this warranty.
Some states do not allow the exclusion or limitation of incidental or con-
sequential 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:
Uni-Line North America
Warranty Claims Department
515 S. Promenade
Corona, CA 91719
11
©2001 Maple Chase Company
Maple Chase Company
2820 Thatcher Road
Downers Grove, Illinois 60515
United States of America

12
NOTES