Aprilaire Model 8570 Thermostat User Manual

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Premium Programmable Thermostat  
Safety & Installation  
Instructions  
Model 8570  
READ AND SAVE THESE INSTRUCTIONS  
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TABLE OF CONTENTS  
PAGE  
PAGE  
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
5. WIRE THE THERMOSTAT TO THE  
HVAC EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . 8  
Diagram 1 – Single-Stage Furnace and AC . . . . . . 9  
Diagram 2 – Two-Stage Furnace and AC . . . . . . 10  
Diagram 3 – Two-Stage Roof Top Unit . . . . . . . . 11  
Diagram 4 – Boiler with AC . . . . . . . . . . . . . . . . 12  
WIRE REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . 2  
1
2
3
. SELECT A MOUNTING LOCATION. . . . . . . . . . . 3  
. OPEN THE THERMOSTAT . . . . . . . . . . . . . . . . . 4  
. MOUNT THE THERMOSTAT BASE  
TO THE WALL . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Diagram 5 – Radiant Floor 1st Stage Heat  
with Furnace 2nd Stage Heat and AC . . . . . . . . . 13  
4
. SET THE CONFIGURATION DIP SWITCHES  
ON THE THERMOSTAT CIRCUIT BOARD . . . . . 6  
Diagram 6 – Single-Stage Heat Pump . . . . . . . . 14  
Diagram 7 – Two-Stage Heat Pump . . . . . . . . . . 15  
6. OPTIONAL – INSTALL AN OUTDOOR  
TEMPERATURE SENSOR . . . . . . . . . . . . . . . . . 16  
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PAGE  
PAGE  
7
8
9
. OPTIONAL – INSTALL AN AUTOMATIC  
HUMIDIFIER CONTROL (AHC) . . . . . . . . . . . . . 19  
10. CUSTOMIZE THE  
APPLICATION SETTINGS . . . . . . . . . . . . . . . 30  
Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Progressive Recovery . . . . . . . . . . . . . . . . . . . . 31  
Balance Points (Heat Pumps Only) . . . . . . . . . . . 32  
Input Dealer Contact Information . . . . . . . . . . . 33  
Blower Extension for Humidity Control . . . . . . . 34  
. OPTIONAL – INSTALL AN INDOOR  
TEMPERATURE SENSOR . . . . . . . . . . . . . . . . . 21  
. THERMOSTAT STARTUP . . . . . . . . . . . . . . . . . 23  
Verify Outdoor Temperature Sensor . . . . . . . . . . 24  
Check Fan Operation . . . . . . . . . . . . . . . . . . . . . . 24  
Verify AHC Connection . . . . . . . . . . . . . . . . . . . . 24  
Check Heating Operation . . . . . . . . . . . . . . . . . . 26  
Check Cooling Operation . . . . . . . . . . . . . . . . . . 28  
Check Emergency Heat Operation  
Monitors – Air Filter, Service Humidifier,  
UV Lamp, Service HVAC . . . . . . . . . . . . . . . . . . 35  
(Heat Pumps Only) . . . . . . . . . . . . . . . . . . . . . . . 29  
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SAFETY INSTRUCTIONS  
Read this Installation Manual before beginning installation of the Aprilaire® 8570 Thermostat. For questions call  
Research Products Corporation at (800) 334-6011.  
WARNING  
1
2
3
. 120 Volts may cause serious injury from electrical shock. Disconnect electrical power to the HVAC equipment before  
starting installation. This thermostat is not a 120-volt (line voltage) device.  
. Improper installation may cause serious injury from electrical shock. This product must be installed by a qualified  
heating and air conditioning contractor in accordance with NEC Standards and applicable local and state codes.  
. Mercury is toxic and may be hazardous to health. Any replaced thermostats containing mercury must be disposed of  
properly. Contact local authorities for disposal information.  
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MODEL 8570 SPECIFICATIONS  
Electrical  
Thermostat Voltage:  
24-volts ± 20% AC or DC  
Total Load Current:  
Single Output Load Current:  
2A  
1A  
Solid State Output Residual Current:  
Voltage Drop at Solid State Outputs:  
Less than 5 mA  
Less than 1-volt  
Thermal  
Operating Range:  
Display Accuracy:  
32°F – 99°F (0 C – 37 C)  
±1°F between 60°F and 80°F, ±2°F outside this range  
±1°F  
Control Accuracy:  
Control Range Heat:  
Control Range Cool:  
Heat/Cool Deadband:  
40°F – 88°F (4 C – 30 C)  
42°F – 90°F (6 C – 32 C)  
2°F or C  
1
st Stage Differential:  
Adjustable 1°F – 3°F (1°F default)  
Adjustable 1°F – 3°F (1°F default)  
Adjustable 1°F – 4°F  
2nd Stage Differential:  
Temperature Offset:  
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WIRE REQUIREMENTS  
Figure 1 and the table show the number of wires that must be available at the thermostat in stand-alone thermostat systems (i.e. not as  
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part of an Aprilaire Model 6504 Intelligent Zone System). Figure 1 shows optional connections to both an outdoor temperature sensor and  
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an Aprilaire Automatic Humidifier Control (AHC), but only one or the other can be used. All wire is standard 18-24 gauge thermostat cable.  
Application  
# Wires  
Diagram (Page)  
1 (9)  
Figure 1 Thermostat Wire  
Single-Stage Furnace/AC  
Two-Stage Furnace/AC  
Two-Stage Roof Top Unit  
Boiler w/AC (2-transformer)  
5
7
7
6
6
OPTIONAL –  
AUTOMATIC  
HUMIDIFIER  
CONTROL  
2 (10)  
HVAC  
EQUIPMENT  
3 (11)  
(
AHC)  
4 (12)  
SEE  
OPTIONAL –  
INDOOR  
Radiant 1st Stage Heat,  
Furnace 2nd Stage and AC  
5 (13)  
OPTIONAL –  
OUTDOOR  
2-WIRES  
TABLE  
TEMPERATURE  
SENSOR  
TEMPERATURE  
SENSOR  
Single-Stage Heat Pump  
Two-Stage Heat Pump  
6
8
6 (14)  
7 (15)  
2
-WIRES  
2
-WIRES  
MODEL 8570  
THERMOSTAT  
Figure 2 Model 6504 Wire  
When this thermostat is connected to a Model 6504 as  
shown in Figure 2, only one four-wire cable need be run  
from the thermostat to the Model 6504. Use standard  
MODEL 8570  
4-WIRES  
MODEL 6504  
THERMOSTAT  
18-24 gauge thermostat cable.  
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(1) SELECT A MOUNTING LOCATION  
If installing the thermostat alone…  
If installing an indoor temperature sensor…  
Mount on an interior wall, in a frequently occupied space.  
Keep the thermostat 18" from an outside wall.  
Mount the thermostat approximately 5 feet above the floor.  
Height requirements are different for compliance with the  
Americans with Disabilities Act (ADA) – 48" maximum height  
for forward reach and 54" maximum height for side reach.  
• Mount the thermostat where it can be readily accessed.  
Note that the backlighting illuminates whenever a button  
is pressed.  
Thermostat can be mounted on a vertical junction box (j-box).  
DO NOT mount the thermostat where the operating range  
temperatures will be exceeded (i.e. attic or unventilated  
equipment room).  
Thermostat can be mounted to a vertical junction box (j-box).  
DO NOT mount the thermostat:  
Mount the sensor in the same location as if installing a  
thermostat alone.  
behind doors, in corners or other dead air spaces.  
in direct sunlight or near lamps, appliances or other  
sources of heat.  
on an outside wall or wall exposed to an unconditioned  
space (i.e. garage).  
in the flow path of a supply register, in stairways or near  
outside doors.  
on a wall where concealed pipes or ductwork could  
influence the sensor.  
near sources of electrical interference such as arcing  
switch contacts.  
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(2) OPEN THE THERMOSTAT  
Use your hands to pull the thermostat face off of the base. Separate one side at a time. There are latches on  
either side of the thermostat.  
If needed, the thermostat can be pried from the base by inserting a flat-head screwdriver (see Figure 3).  
CAUTION  
Figure 3  
Loss of internal programs  
may result from static  
discharge to thermostat  
circuit board. Avoid  
touching the circuit board  
and touch a grounded  
metal object before  
handling the thermostat.  
USE THE SCREWDRIVER TO SEPARATE THE  
HOUSINGS. REPEAT ON THE REMAINING 3 SLOTS.  
NOTE: THE HOUSINGS WILL NOT COMPLETELY  
SEPARATE. PULL THE HOUSINGS APART WITH  
YOUR HANDS TO COMPLETELY SEPARATE.  
INSERT SCREWDRIVER INTO 1 OF  
4
2
SLOTS (2 ARE ON THE TOPSIDE,  
ARE ON THE BOTTOM SIDE)  
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(3) MOUNT THE THERMOSTAT BASE TO THE WALL  
1
. Place the wire opening in the base over the wire entry  
hole in the wall. Level the base (for appearance only)  
and mark the screw locations. See Figure 4.  
Figure 4  
2
. Use the supplied screws and wall anchors to mount  
the thermostat to the wall. It is recommended that wall  
anchors be used for installation to drywall/sheet rock.  
W2  
W1  
RH  
R
Drill a 3/16" hole for wall anchors.  
Drill a 3/32" starter hole for screws only.  
RC  
G
3
. For junction box mounting, screws are field supplied.  
The thermostat can be installed on a vertical j-box.  
IDS  
Y1  
Y2  
B
ODT  
CIR  
GND  
ZA  
ZB  
C
O
4
. Seal the wire entry hole(s) with caulk, drywall putty  
or insulation to prevent drafts from inside the wall  
cavity from affecting thermostat performance.  
I
+
I
-
CAUTION  
Minimize wire entry hole size and seal the hole – drafts from inside the wall could affect temperature readings.  
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(4) SET THE CONFIGURATION DIP SWITCHES ON THE THERMOSTAT CIRCUIT BOARD  
There are four dip switches  
located on the back of the  
thermostat (on the circuit  
board) that must be set to  
properly configure the  
Figure 5  
thermostat for operation  
with the equipment it is to  
control. Figure 5 shows  
the default position for the  
four switches.  
6
504  
AHC  
GAS  
MULTI  
H/C  
ELEC  
SINGLE  
HP  
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6504 or AHC – This switch is used to configure the thermostat  
MULTI or SINGLE – When set to single, the second stage  
installation as part of a Model 6504 Intelligent Zone System.  
outputs (Y2 and W2) do not energize.  
Set to 6504 only if installing as part of a Model 6504  
Intelligent Zone System.  
• Set to SINGLE for single-stage furnace/AC applications or  
single-stage compressor heat pump systems.  
Set to AHC if the thermostat is to be wired to the  
HVAC equipment or standard zone system.  
• Set to MULTI if the furnace or air conditioner is two-stage  
or if the heat pump has a two-stage compressor.  
GAS or ELEC – When set to ELEC, the fan terminal (G) will  
HEAT/COOL or HEAT PUMP – When set to HP the compressor  
be energized on a call for heat.  
terminal (Y1) is the first stage output for both heating and cooling.  
Set to ELEC when the heat source is electric  
such as strip heat).  
• Set to HP when installed with heat pumps.  
(
Set to H/C when installed with furnace/AC systems,  
roof top units or boiler/AC combination systems.  
Set to GAS when the heat source is fossil fuel (oil, propane,  
natural gas). For heat pumps, when set to FOSSIL, the  
compressor terminal(s) will de-energize before the auxiliary  
heat terminal (W1) is energized, thus acting as a fossil fuel kit.  
STOP! If installing this thermostat as part of a Model 6504 Intelligent Zone System, refer to the Model 6504  
Installation Manual for wiring and checkout procedures. Continue Model 6504 installation with Step 10 (page 30).  
If wiring this thermostat directly to the HVAC equipment or standard zone control panel, continue with Step 5.  
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(5) WIRE THE THERMOSTAT TO THE HVAC EQUIPMENT  
WARNING  
120 volts may cause serious injury from electrical shock. Disconnect electrical power to the furnace  
and air conditioner before starting installation. This thermostat is not a 120 volt (line voltage) device.  
1
2
3
4
. Run a cable with the correct number of wires  
Application  
# Wires  
Diagram (Page)  
1 (9)  
(see table) from the thermostat to the HVAC equipment.  
Single-Stage Furnace/AC  
Two-Stage Furnace/AC  
Two-Stage Roof Top Unit  
Boiler w/AC (2-transformer)  
5
7
7
6
6
. Strip 1/4" of insulation from the end of the wires to  
be connected to the thermostat.  
2 (10)  
3 (11)  
. Strip no more insulation than is required to make a  
sound electrical connection at the HVAC equipment.  
4 (12)  
. Wire the thermostat to the HVAC equipment according  
to the wiring schematic appropriate for your HVAC  
equipment.  
Radiant 1st Stage Heat,  
Furnace 2nd Stage and AC  
5 (13)  
Single-Stage Heat Pump  
Two-Stage Heat Pump  
6
8
6 (14)  
7 (15)  
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Diagram 1: Single-Stage Furnace and AC  
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Diagram 2: Two-Stage Furnace and AC  
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Diagram 3: Two-Stage Roof Top Unit  
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Diagram 4: Boiler with AC  
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Diagram 5: Radiant Floor 1st Stage Heat with Furnace 2nd Stage Heat and AC  
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Diagram 6: Single-Stage Heat Pump  
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Diagram 7: Two-Stage Heat Pump  
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(6) OPTIONAL INSTALL AN APRILAIRE MODEL 8052 OUTDOOR TEMPERATURE SENSOR  
Note: If an AHC is to be installed, do not wire  
an outdoor temperature sensor– see Step 7.  
The AHC uses its own outdoor temperature  
sensor, which can be read by the thermostat.  
Figure 6  
1
. Mount the outdoor temperature sensor  
NORTH, EAST  
OR WEST SIDE  
OF BUILDING  
(see Figure 6).  
Locate on the North side of the building if  
possible. East and West are acceptable  
locations as long as the sensor will not be  
exposed to direct sunlight.  
Mount above anticipated snow line.  
SENSOR WITH  
BRACKET  
Mount at least 3 feet away from exhaust  
vents and condensing units.  
Maximum wire length from sensor to  
thermostat is 300 feet.  
ABOVE SNOW LINE  
Under a soffit or under a wall overhang are  
recommended areas for mounting the sensor.  
Follow any additional location requirements  
found on sensor installation instructions.  
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2. Run a 2-wire cable from the sensor to the thermostat.  
OUTDOOR TEMPERATURE (°F)  
RESISTANCE (k)  
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30  
20  
10  
0
230.6  
163.8  
117.6  
85.4  
62.6  
46.3  
34.6  
26.1  
19.9  
15.3  
11.9  
9.4  
CAUTION  
voltage (120 VAC) or higher lines as this can cause  
erratic readings.  
Do not run the wire along side line  
3
. Take a resistance measurement before connecting to the  
ODT and CIR GND terminals to verify the sensor is  
properly installed. Measure the wires at the thermostat to  
account for wire splices.  
10  
2
3
4
0
0
0
Use an ohmmeter to measure the resistance (k) of  
the sensor. The resistance reading will depend on the  
outdoor temperature (see table).  
50  
6
7
8
9
0
0
0
0
4
. Wire the sensor to the thermostat (see Figure 7).  
Strip 1/4" of insulation from the two sensor wires.  
Connect the sensor wires to the ODT and CIR GND  
terminals of the thermostat. The wiring is not polarity  
sensitive, so either wire can be connected to either  
thermostat terminal.  
7.4  
100  
5.9  
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Figure 7  
IDS  
ODT  
CIR  
GND  
ZA  
ZB  
C
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(7) OPTIONAL INSTALL AN AUTOMATIC HUMIDIFIER CONTROL (AHC)  
Note: The AHC uses its own outdoor temperature sensor,  
which is read by the thermostat. If an AHC is to be installed,  
do not wire an outdoor temperature sensor to the ODT  
terminal of the thermostat.  
3. Wire the AHC to the thermostat (see Figure 8).  
Strip 1/4" of insulation from the ends of the wires.  
Connect the I- terminal of the AHC to the I- terminal of  
the thermostat.  
1. Mount the AHC and its outdoor temperature sensor.  
Connect the I+ terminal of the AHC to the I+ terminal of  
the thermostat.  
Follow the directions provided with the AHC except do not  
mount the AHC temperature sensor in a fresh air intake.  
The temperature sensor must be mounted outside.  
4
. You will need to power up the thermostat to verify the  
connection. Refer to step 5 of THERMOSTAT START UP  
on page 24.  
Maximum wire length from AHC to thermostat is 300 feet.  
The AHC must have constant power. DO NOT power the  
5
. After completing the thermostat installation, you will also  
need to verify proper operation of the AHC – see AHC  
installation instructions for details on how this is done.  
AHC through furnace accessory terminals.  
DO NOT operate the AHC in Manual Mode – this will result  
in the outdoor temperature shown on the thermostat to  
always be 20°F.  
WARNING  
Improper installation may cause serious  
2. Run a 2-wire cable from the AHC to the thermostat.  
injury from electrical shock. Do not power up humidifier  
before completing the thermostat installation.  
CAUTION  
Do not run the wire along side line voltage  
(120 VAC) or higher lines as this can cause erratic readings.  
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Figure 8  
7
6
5
4
A
B
OFF  
C
3
2
1
AUTOMATIC MODE  
I+ I-  
R
4VC  
H
ODT  
2
B2203201 Rev. B  
AHC must be powered by a  
continuous supply – do not wire  
to furnace accessory terminals.  
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(8) OPTIONAL INSTALL AN APRILAIRE MODEL 8051 INDOOR FLUSH MOUNT TEMPERATURE SENSOR  
1
. Mount the indoor temperature sensor.  
3. Take a resistance measurement before connecting to  
the IDS and CIR GND terminals to verify the sensor is  
properly installed.  
Locate the sensor as you would locate a thermostat.  
Maximum wire length from sensor to thermostat is  
Use an ohmmeter to measure the resistance (k) of the  
sensor. The resistance reading will depend on the indoor  
temperature (see table from OUTDOOR SENSOR  
installation section on page 17).  
300 feet.  
Follow the installation instructions provided with  
the sensor.  
2. Run a 2-wire cable from the sensor to the thermostat.  
4. Wire the sensor to the thermostat (see Figure 9).  
Strip 1/4" of insulation from the two sensor wires.  
CAUTION  
side line voltage (120 VAC) or higher lines as  
this can cause erratic readings.  
Do not run the wire along  
Connect the sensor wires to the IDS and CIR GND  
terminals of the thermostat. The wiring is not polarity  
sensitive, so either wire can be connected to either  
thermostat terminal.  
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Figure 9  
IDS  
ODT  
CIR  
GND  
ZA  
ZB  
C
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(9) THERMOSTAT STARTUP  STAND ALONE APPLICATIONS  
MESSAGE  
CENTER  
EQUIPMENT  
STATUS  
OUTDOOR  
TEMPERATURE  
SETPOINTS  
ROOM  
TEMPERATURE  
MULTI-FUNCTION  
BUTTONS  
UP/DOWN BUTTONS  
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If an AHC has been installed, allow the fan to operate  
for no less than 40 seconds. If an AHC is not part of this  
installation, you can turn the fan off at any time. A humidity  
value can be displayed only after at least 40 seconds of  
blower run-time to ensure the humidity reading is  
representative of the room air.  
NOTE: Refer to the Owners Manual for  
thermostat operating instructions.  
1
. PLACE THE THERMOSTAT ON THE BASE.  
. TURN ON POWER TO THE HVAC SYSTEM.  
2
The display will show the Aprilaire screen for approximately  
seconds (up to 10 seconds if installed as part of a  
Model 6504 Intelligent Zone System).  
• Turn the fan off (set to AUTO).  
5
5. VERIFY AHC CONNECTION (if optional Automatic  
Humidifier Control installed).  
After this initial screen the thermostat will enter  
operational mode.  
Ensure that the AHC has power (the green status light on  
the AHC should be on) and make sure the AHC is  
functioning properly – see AHC installation procedure for  
start up and diagnostics.  
3. VERIFY OUTDOOR TEMPERATURE SENSOR CONNECTION  
(if optional outdoor temperature sensor installed).  
If an outdoor temperature sensor has been installed  
and is operational, an outdoor temperature will appear  
on main display.  
• From the Main Screen, press the “INFO” button.  
The outdoor temperature and relative humidity will be  
displayed for five seconds after which the contact screen  
will be displayed (see page 33 for additional information  
on the contact screen).  
4. CHECK FAN OPERATION  
Turn on the fan (set to ON).  
When the humidifier is operating, the message  
The thermostat G terminal will energize and the system  
blower will start. The Fan Status on the display will show  
“HUMIDIFIER ON” appears at the message center,  
alternating with the time and date and any other currently  
active messages.  
“FAN ON.”  
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TROUBLESHOOTING AHC CONNECTION  
Symptom  
Cause  
Miswiring – Check wire colors to verify I- at AHC is connected to I- at  
thermostat and I+ is connected to I+.  
No RH display, no outdoor  
temperature display  
AHC power source – When wired to the Model 8570 thermostat, the AHC  
must be wired to a continuously ON power source. Use voltmeter to verify  
presence of 24VAC (nominal) at AHC.  
AHC not operating correctly – check red diagnostic light on AHC.  
No valid reading available – run fan for at least 40 seconds.  
No RH display, outdoor temperature OK  
RH display, outdoor temperature @ 20°F  
AHC set for manual mode of operation. Wire an outdoor sensor to the AHC  
or wire an outdoor sensor to the thermostat.  
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6. CHECK HEATING OPERATION  
• Wait for 2nd Stage:  
Notes:  
– Furnace, Boiler: Minimum-on time for 1st stage  
is 2 minutes.  
1
. To avoid the minimum off times during system  
checkout, always start and end the check out  
procedure in the OFF mode.  
• W1, W2 (and G if GAS/ELEC dip switch set to the  
ELEC position) will energize.  
2. Do not operate heat pumps in the heating mode at high  
outdoor temperatures for extended periods of time.  
– Heat pumps: Minimum-on time for 1st stage is  
4 minutes.  
Set the thermostat to the OFF mode.  
Set the thermostat to the HEAT mode:  
• Y1, W1 and G terminals will energize if  
SINGLE/MULTI dip switch set to SINGLE and  
ELEC/GAS dip switch set to ELEC.  
The B terminal will energize when in the Heat mode.  
Y1, Y2 and G terminals will energize if SINGLE/MULTI  
dip switch set to MULTI.  
Raise the heat setting to 5° higher than the room  
temperature to initiate a 1st stage heat call. The mode  
display will change from "HEAT MODE" to "HEATING",  
which will flash when the thermostat is calling for heat:  
W1 will energize if SINGLE/MULTI set to SINGLE and  
ELEC/GAS set to GAS.  
Wait 4 minutes for 3rd Stage (multi-stage compressor heat  
pump systems only):  
Furnace, Boiler: W1 (and G if GAS/ELEC dip switch is set  
in the ELEC position) terminals will energize.  
Y1, Y2, W1 and G terminals will energize if  
Heat pumps: Y1 and G terminals will energize.  
SINGLE/MULTI set to MULTI and ELEC/GAS set to ELEC.  
W1 will energize if SINGLE/MULTI set to MULTI and  
ELEC/GAS set to GAS.  
Set the thermostat to the OFF mode.  
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TROUBLESHOOTING HEATING OPERATION  
Symptom  
Cause  
Minimum-off times. Change the mode to OFF first, then change the mode to  
HEAT and make a call for heat.  
Thermostat does not call for heat  
Heating does not come on at all  
Auxiliary Heat does not come on  
RH terminal not connected – see wiring diagrams.  
Heating equipment power not on.  
High Balance point limit – set balance point higher than outdoor temperature  
or disconnect outdoor temperature sensor during system checkout.  
Furnace plenum sensor keeps fan on – normal.  
Blower Extension for humidifier operation. Verify that the message  
Fan stays on after heat call  
"HUMIDIFYING" appears at the message center, alternating with the time  
and date and any other currently active messages.  
Change position of ELEC/GAS dip switch – ELEC for electric heat systems  
Fan comes on before heat starts, or  
Fan does not come on with heat  
(fan on with heat call) or to GAS for fossil fuel systems where the fan is  
controlled internally by the heating equipment.  
Reversing valve wiring.  
Cooling comes on instead of heat  
Miswiring – check wire colors at thermostat and HVAC equipment.  
Takes longer than 4 minutes for auxiliary  
heat to come on after compressor heat.  
SINGLE/MULTI dip switch set incorrectly – set to SINGLE for single-stage  
compressor systems.  
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7. CHECK COOLING OPERATION  
• Set the thermostat to the COOL mode:  
Notes:  
– The O terminal will energize when in the Cool mode.  
1
. To avoid the minimum off times during system  
checkout, always start the check out procedure  
in the OFF mode.  
• Lower the cool setting to 5° below the room temperature  
to initiate a 1st stage cool call. The mode display will  
change from “COOL MODE” to “COOLING”, which will flash  
when the thermostat is calling for cooling:  
2
. Do not operate air conditioning at low outdoor  
temperatures. Refer to equipment manufacturers  
recommendations for safe operating temperatures.  
– Y1 and G terminals will energize.  
Wait 4-minutes for 2nd Stage:  
Y1, Y2 and G terminals will energize.  
Set the thermostat to the OFF mode.  
Set the thermostat to the OFF mode.  
TROUBLESHOOTING COOLING OPERATION  
Symptom  
Cause  
Minimum-off times. Change the mode to OFF first, then change the mode  
to COOL and make a call for cooling.  
Thermostat does not call for cooling  
Cooling does not come on at all  
RC terminal not connected – see wiring diagrams.  
Cooling equipment power not on.  
Reversing valve wiring.  
Heat comes on instead of cooling  
Miswiring – check wire colors at thermostat and HVAC equipment.  
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8
. CHECK EMERGENCY HEAT OPERATION  
Heat Pumps Only)  
Notes:  
• Raise the heat setting to 5° higher than the room  
temperature to initiate a 1st stage heat call. The mode  
display will change from “E-HEAT MODE” to “HEATING”,  
which will flash when the thermostat is calling for heat:  
(
1. To avoid the minimum off times during system checkout,  
W1 (and G if GAS/ELEC dip switch is set in the ELEC  
position) terminals will energize.  
always start the check out procedure in the OFF mode.  
Set the thermostat to the OFF mode:  
Wait for 2nd Stage:  
Set the thermostat to the EMERGENCY HEAT  
Minimum-on time for 1st stage is 2 minutes.  
(EMERG) mode:  
W1, W2 (and G if GAS/ELEC dip switch set to the  
ELEC position) will energize.  
The B terminal will energize when in the  
Emergency Heat mode.  
Set the thermostat to the OFF mode.  
TROUBLESHOOTING EMERGENCY HEAT OPERATION  
Symptom  
Cause  
Thermostat does not call for heat  
Minimum-off times. Change the mode to OFF first, then change the mode  
to EMERGENCY HEAT and make a call for heat.  
RH terminal not connected – see wiring diagrams.  
Heating equipment power not on.  
Emergency Heat does not come on at all  
Change position of ELEC/GAS dip switch – ELEC for electric heat systems  
Fan comes on before heat starts, or  
Fan does not come on with heat  
(fan on with heat call) or to GAS for fossil fuel systems where the fan is  
controlled internally by the heating equipment.  
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(10) CUSTOMIZE THE APPLICATION SETTINGS  
1. DIFFERENTIAL  
3. Use the  or  button to highlight “SET DIFFERENTIAL”  
and press the SELECT button.  
Determines the temperature above/below the temperature  
setting at which the heating or cooling equipment will turn  
on. For example, a heat temperature setting of 70°F with a  
differential of 2° will result in the equipment turning on and  
off to maintain the temperature between 68°F and 70°F. If the  
second stage differential is also 2°, the second stage would  
be used to ensure the temperature did not drop below 66°.  
However, once the second stage is turned on, it will stay on  
until the temperature again reaches the 70° setting. The default  
setting for the first stage and second stage differential is 1°.  
– If the thermostat SINGLE/MULTI dip switch is set for  
MULTI, two differentials will appear, if set for SINGLE,  
only one will appear.  
4
. To cancel, press the BACK button. This will return you  
to the ADV. SETTINGS MENU.  
5
. To change the first stage differential, press the  and ꢁ  
button to raise or lower the setting. To change the second  
stage differential, press the SELECT button.  
6
. To finish and return to the ADV. SETTINGS MENU, press  
the SELECT button after the value(s) have been set.  
To change the differential settings:  
1. Make sure the thermostat is in the OFF mode.  
For heat pumps – the auxiliary heat differential is the  
same as the first stage differential in single-stage heat  
pump applications and is the same as the second stage  
differential for two-stage heat pump applications.  
2. Press and hold both the  and  buttons for 3 seconds.  
The display will show the ADV. SETTINGS MENU.  
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2
. OFFSET  
All thermostats are factory calibrated to be accurate to within  
1° of true temperature. An offset is available to allow for  
3. PROGRESSIVE RECOVERY  
Progressive Recovery causes the thermostat to bring on the  
heating/cooling equipment before the programmed event start  
time, in order for the temperature to be at the programmed  
value by the programmed time. The feature can be turned on  
or off. When turned off, the heating/cooling equipment will  
not begin bringing the space temperature to the programmed  
value until the start of the event.  
±
agreement with field temperature measuring instruments. The  
value set will be added to the temperature sensed by the  
thermostat. The result will be displayed on the thermostat and  
will be used as the control value.  
To change the offset:  
To turn Progressive Recovery on or off:  
1. Make sure the thermostat is in the OFF mode.  
1. Make sure the thermostat is in the OFF mode.  
2. Press and hold both the  and  buttons for 3 seconds.  
2. Press and hold both the  and  buttons for 3 seconds.  
The display will show the ADV. SETTINGS MENU.  
The display will show the ADV. SETTINGS MENU.  
3. Use the  or  button to highlight “SET OFFSET” and  
press the SELECT button.  
3. Use the  or  button to highlight “PROGRESSIVE  
RECOVERY” and press the SELECT button.  
4. To cancel, press the BACK button.  
To cancel, press the BACK button  
5. To change the offset value, press the  or  button to  
raise or lower the setting between –4° and +4° (°F or °C).  
To change whether Progressive Recovery is on or off,  
press the  or  button to highlight either ON or OFF.  
6
. To finish and return to the ADV. SETTINGS MENU, press  
the SELECT button.  
 To finish and return to the ADV. SETTINGS MENU, press  
the SELECT button.  
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4. BALANCE POINTS (HEAT PUMPS ONLY)  
3. Use the  or  button to highlight “SET BALANCE  
POINTS” and press the SELECT button.  
This feature is only available when the thermostat has been  
configured to operate heat pumps (see SET THE  
CONFIGURATION DIP SWITCHES on page 6) and only when an  
outdoor temperature is available to the thermostat. Outdoor  
temperature can come from an AHC or from an outdoor  
temperature sensor.  
4. To cancel, press the BACK button. This will return you to  
the ADV. SETTINGS MENU.  
. To change the low balance point, press the  or ꢁ  
button to raise or lower the temperature value  
5
(range is 0°F to 40°F).  
The low balance point is the outdoor temperature at or below  
which the thermostat will lockout the compressor(s) – only  
auxiliary heat will be used to satisfy heating demands. The high  
balance point is the outdoor temperature at or above which the  
thermostat will lockout the auxiliary heat – only compressor  
heat will be used to satisfy heating demands. Emergency heat  
operation is unaffected by the high balance point.  
6. To change the high balance point, press the SELECT  
button, then press the  or  button to raise or lower the  
temperature value (range is 40°F to 80°F).  
7. To finish and return to the ADV. SETTINGS MENU, press  
the SELECT button after the value(s) have been set.  
Important time saver: If the thermostat is installed as part  
of a Model 6504 Intelligent Zone System, the balance points  
only need to be changed at one thermostat. The Model 6504  
will share the new settings with all connected thermostats.  
To change the balance points:  
1. Make sure the thermostat is in the OFF mode.  
2. Press and hold both the  and  buttons for 3 seconds.  
The display will show the ADV. SETTINGS MENU.  
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5
. INPUT DEALER CONTACT INFORMATION  
4. To cancel, press the BACK button. This returns to the  
ADV. SETTINGS MENU. You must be at the first position  
when pressing the BACK button to return to the  
ADV. SETTINGS MENU.  
During thermostat operation, the two multi-function buttons  
are labeled INFO and MENU. When the INFO button is  
pressed, the thermostat will display the humidity and  
temperature sensed by the AHC (if an AHC has not been  
installed the Aprilaire logo screen will appear), then the  
thermostat will display the thermostat model number and  
contact information. At installation, the contact information is  
blank and only the thermostat model number appears. You  
have the option of inputting this contact information with the  
name and number of your company. Twenty (20) characters  
are available for your company name. Space for a telephone  
number, including area code, is available.  
5. To delete a character, press the BACK button.  
6. To enter a letter in the name of the company, use the  
 or  buttons to scroll through the available characters.  
Press the SELECT button to enter the character. For spaces,  
press SELECT.  
7
. To finish and go to the company number screen,  
repeatedly press SELECT until all remaining characters have  
been filled with spaces, then press SELECT again.  
8. To delete a number, press the BACK button.  
To change the contact information:  
9
. To enter a number, use the  or  buttons to scroll  
between the available characters. Press the SELECT button  
to enter the character. The full 10-digit telephone number  
must be entered.  
1. Make sure the thermostat is in the OFF mode.  
2. Press and hold both the  and  buttons for 3 seconds.  
The display will show the ADV. SETTINGS MENU.  
3
. Use the  or  button to highlight “INPUT DEALER INFO”  
and press the SELECT button. This enters the company  
name screen.  
10. To finish, press the SELECT button after entering the  
10th digit.  
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6. BLOWER EXTENSION FOR HUMIDITY CONTROL  
3. Use the  or  button to highlight BLOWER EXTENSION”  
and press the SELECT button.  
If the heating equipment has not run long enough to allow the  
humidifier to meet the humidity demand, the thermostat will  
continue the blower after a heat call. One second before the  
thermostat turns off the heating terminal(s), the fan terminal  
will be energized thus extending blower operation. If the fan  
terminal was on as part of the heat call it will remain on, if it  
was not on it will be turned on. The thermostat will operate  
the blower for no less than 5 minutes after the heat call and  
not more than 15 minutes. This will allow the humidifier to  
continue to put moisture in the air to satisfy the humidity  
demand. This feature can be enabled or disabled and can only  
be used when an AHC is part of the installation.  
4. To cancel, press the BACK button  
5
. To change whether Blower Extension is enabled (on) or  
disabled (off), press the  or  button to highlight either  
ON or OFF.  
6
. To finish and return to the ADV. SETTINGS MENU, press  
the SELECT button.  
Important: When the thermostat is installed as part of a  
Model 6504 Intelligent Zone System, leave this feature  
disabled. The Model 6504 performs this function.  
Note: To take full advantage of this feature, the humidifier  
should be plumbed to hot water.  
To enable blower extension:  
1. Make sure the thermostat is in the OFF mode.  
2. Press and hold both the  and  buttons for 3 seconds.  
The display will show the ADV. SETTINGS MENU.  
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7. MONITORS AIR FILTER, SERVICE HUMIDIFIER,  
3. Use  or  button to highlight MONITORS, then press  
UV LAMP, SERVICE HVAC  
SELECT. Press BACK to cancel.  
The thermostat monitors time and can display scheduled  
reminders for the user to service their humidifier, change their  
filter and UV lamps, and to remind the user to schedule an  
HVAC system maintenance check. All monitors are strictly time  
based, so setting a filter monitor to three months will result in  
the change reminder being displayed in three months,  
regardless of how much the HVAC system has run in that  
period. All monitors can also be turned off for installations  
where one or more of the components may not be installed.  
When the thermostat has verified that a monitor setting has  
been reached, a message is displayed on the thermostat (at  
the message center location where date and time are normally  
displayed) and the label for the multi-function button normally  
labeled INFO changes to CALL DEALER.  
4. Use  or  button to highlight the monitor you wish to  
set (AIR FILTER, SERVICE HUMIDIFIER, UV LAMP or  
SERVICE HVAC) then press the SELECT button. Press the  
BACK button to cancel.  
5
. Use  or  button to highlight the amount of time you  
wish to set then press the SELECT button. Press the BACK  
button to cancel.  
6. Pressing the SELECT button, after setting the schedule,  
takes you back to the MONITORS screen.  
To set additional reminder schedules return to step 3.  
To finish, press the BACK button three times to return to  
normal operation.  
Important: When an AHC is installed with the thermostat,  
either directly or as part of a Model 6504 Intelligent Zone  
System, the service humidifier monitor will automatically be  
set to AUTO. AUTO is not a choice unless an AHC is present.  
Set to AUTO, the AHC will initiate “service humidifier” based  
on humidifier type and run time.  
To set humidifier, filter, UV and HVAC service  
reminder schedules:  
1. Press the MENU button.  
2. Use  or  button to highlight SETTINGS, then press the  
SELECT button. Press the BACK button to cancel.  
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DP #10006198  
B2203358A  
P.O. BOX 1467 • MADISON, WI 53701-1467  
Printed in U.S.A.  

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