Outdoor temperature sensor (optional) .............2
Remote temperature sensor (optional) .............3
Power & reset options..........................3
Wiring terminal ...............................4
Wiring diagrams ............................5-7
SETUP & TESTING
Equipment type selection switch (SW1) ............8
Installer setup menu ...........................8
Installer system settings table ................9-11
System test menu ............................12
System test tables............................13
REFERENCES
Quick reference to controls & display..........14-15
Thermostat features ..........................16
Troubleshooting ..............................17
Error codes ..................................18
Specifications................................19
Page 2
INSTALLATION
CR
CR
INSTALLATION
INSTALLATION LOCATION RECOMMENDATIONS
Thermostat should be mounted:
• On an interior wall, in a frequently occupied space.
• Approximately 5‘ above floor.
• At least 18” from outside wall.
• Thermostat can be mounted to a vertical junction box.
Do not mount thermostat:
• Behind doors, in corners or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other
appliances that give off heat.
• On an outside or unconditioned area wall.
• In the flow of a supply register, in stairwells, or near
outside doors.
• On a wall with concealed pipes or ductwork.
THERMOSTAT MOUNTING
1. Remove the rear mounting plate from the thermostat.
2. Pull wires through the opening on the back of the
thermostat.
3. Position and level the mounting plate of the thermostat
on wall and mark the hole locations with a pencil.
4. Drill 1/4” holes and insert supplied anchors
(drywall only).
5. Place mounting plate over anchors, insert and tighten
screws.
6. Seal wire entry holes to prevent drafts affecting
temperature readings.
OUTDOOR TEMPERATURE SENSOR (OPTIONAL)
Outdoor temperature can be measured by attaching an 8052 sensor to the S1 and S2 terminals. The outdoor sensor
must be enabled in the installer setup menu.
In heat pump mode the outdoor temperature
sensor can be used to efficiently utilize an air
source heat pump:
• When the outdoor temperature is less than the Low
Balance Point, the heat pump will be locked out and
only auxiliary heating will be used.
• When the outdoor temperature is higher than the
High Balance Point, the auxiliary heating will be
locked out and only the heat pump will be used to
Outdoor temperature sensor should be mounted:
• On side of building out of direct sunlight (north side
recommended).
• Above snow line.
• At least 3’ away from exhaust vents and condensing
lines.
• Using less than 300’ of wire.
• Do not route wires along 120 VAC lines.
provide heating.
REMOTE TEMPERATURE SENSOR (OPTIONAL)
A remote temperature sensor can be used if the thermostat is to be mounted in a concealed location. A 8051 flush
mount or 8053 surface mount remote temperature sensor can be attached to the T1 and T2 terminals and mounted
in a recommended area. The remote sensor must be enabled in the installer set-up menu, and once enabled will
override the thermostat’s internal temperature sensor.
Remote temperature sensor should be mounted:
• On an interior wall, in a frequently occupied space.
• Approximately 5‘ above floor.
• At least 18” from outside wall.
• Using less than 300’ of wire.
Do not mount remote sensor:
• Behind doors, in corners or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other
appliances that give off heat.
• On an outside or unconditioned area wall.
• In the flow of a supply register, in stairwells, or near
outside doors.
• On a wall with concealed pipes or ductwork.
• Near 120 VAC lines.
B+ A+ B- A-
W2RH
RCWBOYY2G
S2
T2T1S1
RSARSB
POWER & RESET OPTIONS
The thermostat is a 24VAC powered device with a battery back-up for the clock.
The thermostat has a memory backup that saves the thermostat settings in case of a power interruption. The system
settings will be retained but the clock will reset after 90 seconds with no battery or AC power.
The reset button located under the battery cover can be used to reset the thermostat to factory defaults. The system
settings will also be reset to default.
W2RH
B+ A+ B- A-
23
RCWBOYY2G
S2
T2T1S1
RSARSB
Page 3
INSTALLATION
BW
CS
BW
CS
THERMOSTAT IS POWERED
INSTALLATION
WIRING TERMINAL
B+
A+A-
B-
BYORC RH
Y2
G
C
Wire specifications:
18-24 gauge thermostat wire
CAT-5 or equivalent for communication terminals
Installation notes:
• Ensure power at the HVAC equipment is off.
• Loosen screw terminals, insert stripped wire and
re-tighten.
• Push the excess wire back into the opening and plug
the wall opening to prevent drafts.
Note: If the HVAC system was installed before the
automation system, the HVAC installer may have
powered the thermostat connecting a wire to the
C terminal and installing a jumper wire from the R
terminal to RH or RC. When used with an automation
system, the R and C terminals on the Model 8800
thermostat should only be connected to the same
terminals on the 8819 or a dedicated 24VAC transformer.
There should be no connection to the R or C terminals
coming from the HVAC equipment.
W2
RT2
W
B+ / B- – Receive communication terminal
(reference automation system)
A+ / A- – Transmit communication terminal
(reference automation system)
S2
S1
T1
RSARSB
1
1
C – 24VAC Thermostat power (common) from 8819
R – 24VAC Thermostat power (hot) from 8819
B – Reversing valve for heat
O – Reversing valve for cool
2
2
Y – 1st stage cooling / compressor or dehumidifier3
Refer to Aprilaire HVAC Automation System Installation Manual
for communication wiring details.
2
O and B terminals are both de-energized when system mode is
OFF or in AUTO when the heating and cooling equipment is idle.
3
When the unit is configured for humidistat mode.
4
Jumper between RC & RH is used in single transformer systems
(see wiring diagrams).
5
Refer to Support Module literature for wiring details.
5
CONVENTIONAL HEAT/COOL
SINGLE TRANSFORMER (USE JUMPER WIRE)
THERMOSTAT IS POWERED
FROM 8819 OR 24VAC
TRANSFORMER
TRANSFORMER
COMMUNICATION
TERMINALS
NOT USED
NOT USED
FAN
1st COOLING
2nd COOLING
GY2YO
JUMPER
RC RH W2
2nd HEATING
1st HEATING
SENSOR
OUTDOOR TEMP
S2R
SENSOR
REMOTE TEMP
SUPPORT
MODULE
1T1T2A-B-A+B+
RSB RSA
TWO TRANSFORMERS (REMOVE JUMPER WIRE)
FROM 8819 OR 24VAC
TRANSFORMER
HEATING
TRANSFORMER
COOLING
TRANSFORMER
3
COMMUNICATION
TERMINALS
NOT USED
NOT USED
FAN
1st COOLING
2nd COOLING
GY2YO
RC RH W2
2nd HEATING
1st HEATING
SENSOR
OUTDOOR TEMP
S2R
SENSOR
REMOTE TEMP
SUPPORT
MODULE
1T1T2A-B-A+B+
RSB RSA
45
Page 4
INSTALLATION
BW
CS
THERMOSTAT IS POWERED
BW
CS
THERMOSTAT IS POWERED
BW
CS
THERMOSTAT IS POWERED
BW
CS
INSTALLATION
HEAT PUMP
COMMUNICATION
COMMUNICATION
TERMINALS
TERMINALS
SINGLE TRANSFORMER (USE JUMPER WIRE)
FROM 8819 OR 24VAC
TRANSFORMER
HEAT PUMP
TRANSFORMER
1st COMPRESSOR
REVERSING VALVE
FAN
2nd COMPRESSOR
JUMPER
2nd AUX HEATING
OUTDOOR TEMP
1st AUX HEATING
OR
GY2YO
RC RH W2
S2R
NOTE: “O” is active in cooling and “B” is active in heating.
TWO TRANSFORMERS (REMOVE JUMPER WIRE)
FROM 8819 OR 24VAC
TRANSFORMER
HEATING
TRANSFORMER
HEAT PUMP
TRANSFORMER
1st COMPRESSOR
REVERSING VALVE
FAN
2nd COMPRESSOR
2nd AUX HEATING
OUTDOOR TEMP
1st AUX HEATING
SENSOR
1T1T2A-B-A+B+
SENSOR
SENSOR
REMOTE TEMP
SUPPORT
MODULE
RSB RSA
SENSOR
REMOTE TEMP
SUPPORT
MODULE
HUMIDISTAT
COMMUNICATION
COMMUNICATION
TERMINALS
TERMINALS
DRY CONTACT
DEHUMIDIFIER
GY2YO
RC RH W2
POWERED CONTACT
HUMIDIFIER
DEHUMIDIFIER
DEHUMIDIFIER
TRANSFORMER
GY2YO
RC RH W2
TRANSFORMER
FROM 8819 OR 24VAC
TRANSFORMER
HUMIDIFIER
S2R
1T1T2A-B-A+B+
THERMOSTAT IS POWERED
FROM 8819 OR 24VAC
TRANSFORMER
HUMIDIFIER
S2R
1T1T2A-B-A+B+
SUPPORT
MODULE
RSB RSA
SUPPORT
MODULE
RSB RSA
OR
GY2YO
RC RH W2
S2R
1T1T2A-B-A+B+
RSB RSA
NOTE: “O” is active in cooling and “B” is active in heating.
67
Page 5
SETUP & TESTING
HC
HP
SETUP & TESTING
EQUIPMENT TYPE SELECTION SWITCH (SW1)
This thermostat has the option of being used in heat
pump or heat/cool systems. Switch SW1 located on the
back of the thermostat’s face is used to select this option.
This setting can also be checked in the Installer System
Settings under Equipment Type.
Note: Thermostat reboots within 10 seconds after switch
position is changed.
HC
HP
INSTALLER SETUP MENU
HOW TO ENTER THE INSTALLER SETUP MENU TO CHANGE SYSTEM SETTINGS:
Press [MODE] to set system to OFF.
Press [MENU] to enter main menu.
Press and hold [SETUP] for seven seconds, [INSTALL
SETUP] appears.
Press [INSTALL SETUP] to enter installer setup menu.
Press [NEXT] or [BACK] to page through the settings.
Press
or to adjust the setting.
Press [DONE] to save and exit, or [CANCEL] to exit
without saving.
The thermostat will discard changes and exit if nothing
is pressed within 60 seconds.
SETTING
NUMBER
To reset the installer settings to the default, reset the
thermostat by pressing the [RESET] button inside the
battery cover.
SETTING
OPTIONS
SETTING
DESCRIPTION
SW1
HEAT/COOL
HEAT PUMP
INSTALLER SYSTEM SETTINGS TABLE
The following table is the list of the settings and their details. Default settings are shown in bold. Some settings are
only available to thermostats set to heat pump or humidistat mode.
Factory default setting (bold)
System settingDescription
00. NETWORK ADDRESSNetwork communication address.
01. NUMBER OF NODESTotal number of thermostats on the network.
02. BAUD RATECommunication baud rate.
03. CONTROLLER TYPESets controller to Thermostat or Humidistat.
04. EQUIPMENT TYPEEquipment type is set by SW1.
05. CONTROL SETUPUsed to lockout heating or cooling outputs
06. AUTO CHANGEOVEREnable or disable Auto changeover mode.
07. NUMBER OF STAGESNumber of stages of equipment.
08. AUX HEAT STAGESNumber of stages of auxiliary heat equipment.
09. Heat/Cool: FAN
CONTROL IN HEATING
Heat Pump: AUXILIARY
EQUIPMENT TYPE
10. Thermostat:
COMPRESSOR MIN OFF
TIME
10. Humidistat:
DEHUMIDIFIER MIN
ON/OFF TIME
11. Thermostat: HEATING
MIN OFF TIME
11. Humidistat: HUMIDIFIER
MIN ON/OFF TIME
12. EQUIPMENT MIN ON
TIME
13. AUTO CHANGEOVER
TIME
14. REMOTE SENSORSelect if remote sensor is attached at T1 and T2.
15. OUTDOOR SENSORSelect if outdoor sensor is attached at S1 and S2.
16. CONTROL SENSOR
BACKUP
17. FIRST STAGE
DIFFERENTIAL
18. SECOND STAGE
DIFFERENTIAL
1
If utilizing a fossil fuel auxiliary heat system, set to Gas or Oil Furnace. In this setting, the heat pump will lock out before the fossil fuel auxiliary
heat comes on; eliminating the need for a dual fuel kit. If utilizing electric auxiliary heat, set to Electric. In this setting, the heat pump and
electric auxiliary heat are allowed to run simultaneously.
(only available in Heat/Cool mode).
Heat/Cool: Determines if the thermostat or
equipment controls the fan in heating.
Heat Pump: Auxiliary Equipment type.
Thermostat: Minimum off time for compressor
protection.
Humidistat: Minimum on/off time for dehumidifier
protection.
Thermostat: Minimum off time for heating.
Humidistat: Minimum on/off time for humidifier.
Minimum on time for heating and cooling.
Minimum time between heating and cooling calls.
Control sensor failure response.STOP CONTROL (enter Error Mode)
1st stage differential.
2nd stage differential.
1
and setting range
1
Address selection of 1 to 64 in steps of 1
64
Selection of 1 to 64 in steps of 1
9600
19200
THERMOSTAT
HUMIDISTAT
HEAT/COOL
HEAT PUMP
HEAT AND COOL
HEAT ONLY
COOL ONLY
DISABLE
ENABLE
SINGLE
MULTI
ONE
TWO
GAS/OIL HEAT (equipment controls fan)
ELECTRIC HEAT (thermostat controls fan)
5 MINUTES
1 to 5 MINUTES
2 MINUTES
1 to 5 MINUTES
2 MINUTES
1 to 5 MINUTES
4 MINUTES
1 to 5 MINUTES
NO
YES
NO
YES
USE BUILT-IN
1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
89
Page 6
SETUP & TESTING
SETUP & TESTING
INSTALLER SYSTEM SETTINGS TABLE (CONTINUED)
Factory default setting (bold)
System settingDescription
19. THIRD STAGE
DIFFERENTIAL
20. FOURTH STAGE
DIFFERENTIAL
21. INTEGRAL FACTOR
PERIOD
22. LOW BALANCE POINTOutdoor temperature low balance point
23. HIGH BALANCE POINTOutdoor temperature high balance point
24. EXTENDED FAN – HEAT Extends fan operation after heat call ends.
25. EXTENDED FAN – COOL Extends fan operation after cool call ends.
26. PROGRESSIVE
RECOVERY
27. DEADBANDAuto changeover mode dead band.
28. HUMIDISTAT MODESets humidity control mode.HUMIDIFY
29. TEMPERATURE SCALESet the thermostat to Fahrenheit or Celsius
30. AUTO DAYLIGHT
SAVINGS
32. CONSTANT BACKLIGHT Enable constant, low intensity, backlight when
33. BACKLIGHT INTENSITYBacklight intensity as a percentage of full on.
34. SENSOR OFFSETField adjustment of the controlling temperature
35. PROGRAM FORMATSelect weekly program format.
36. EVENT CONFIGURATION Setting for event naming.
37. EVENTS PER DAYNumber of program events per day.
38. USER SECURITY SETUPEnable or disable security setup system
39. SECURITYEnable or disable security.
40. SECURITY PINSecurity pin code.####
3rd stage differential.
4th stage differential.
Short period = more cycles per hour (comfort)
Long period = less cycles per hour (economical).
(This option is only displayed if the outdoor
temperature sensor is enabled).
(This option is only displayed if the outdoor
temperature sensor is enabled).
Enable or disable Progressive recovery.DISABLE
mode.
Enable or disable auto daylight savings.OFF
24VAC is present.
sensor.
variables in the User Setup Screens.
and setting range
1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
2 MINUTES
1 to 5 minutes or “OFF” for proportional
control only
20°F (–6°C)
10°F to 50°F (-12°C to 9°C) or OFF to ignore
65°F (18°C)
40°F to 85°F (3°C to 30°C) or OFF to ignore
DISABLE
ENABLE (90 second extension)
DISABLE
ENABLE (90 second extension)
ENABLE
3°F (2°C)
2°F to 9°F (1°C to 5°C)
DEHUMIDIFY
AUTO
OFF
FAHRENHEIT
CELSIUS
MARCH (second Sunday in March to the
first Sunday in November)
APRIL (first Sunday in April to the last Sunday
in October)
DISABLE
ENABLE
100 PERCENT
0 – 100%
0°: No offset applied
–8°F to +8°F (-4°C to +4°C)
7-DAY (Mon, Tue, Wed, Thu, Fri, Sat, Sun)
5/1/1 (weekdays, Saturday and Sunday)
5/2 WEEKDAYS (weekdays and weekends)
NON-PROG
RESIDENTIAL
COMMERCIAL
FOUR
TWO
DISABLE
ENABLE
DISABLE
ENABLE
4-digit numeric pin
INSTALLER SYSTEM SETTINGS TABLE (CONTINUED)
Factory default setting (bold)
System settingDescription
41. LOCKOUT TYPEScreen lockout level. (Override lockout by
51. HUMIDIFIER TYPESelect humidifier type. Flow through type
52. DEHUMIDIFIER ALARM
PERIOD
53. HVAC ALARM PERIODThe period for displaying the “Service HVAC”
holding [MENU] for 7 seconds).
Setpoint lockout setting.
Select setpoint limits (only available when
lockout is set to partial lockout).
Time-limited lockout temporary change period.
Enable or disable display of support module
monitor (remote) sensor readings.
The period for displaying the “Change Air
Filter” message.
Set number of months until the first reminder
is required. The following reminders will occur
every 12 months for a flow through humidifier,
and 3/9 months for a drainless humidifier.
gives a 12 month reminder, and drainless
gives a 3/9 month reminder.
The period for displaying the “Service
Dehumidifier” message.
message.
and setting range
OFF
PARTIAL
FULL
DISABLE
ENABLE
OFF
TIMED
FULL
OFF
TIME-LIMITED
RANGE-LIMITED
TIME AND RANGE
FULL
+/-5 DEGREES (from current setpoint)
±1° to 20° OFF indicates no setpoint changes
or
+/-5% RH (from current setpoint)
±1% to 20% OFF indicates no setpoint changes
60 MINUTES
Selection of 0 to 255 minutes in 5 minute step;
0 indicates no temporary change period.
DISABLE
ENABLE
DISABLE
OFF
1, 3, 6, 12 MONTHS or “OFF” to disable
OFF
1 to 12 MONTHS or “OFF” to disable
FLOW THROUGH (1 reminder per season)
DRAINLESS (2 reminders per season)
OFF
1 to 12 MONTHS or “OFF” to disable
OFF
1 to 12 MONTHS or “OFF” to disable
1011
Page 7
SETUP & TESTING
SETUP & TESTING
SYSTEM TEST MENU
The system test menu is used to test a system after installation. The outputs of the thermostat or humidistat can be
manually activated to test their function. The instructions below show how to enter the test mode and turn outputs
on and off.
HOW TO ENTER THE SYSTEM TEST MENU:
Press [MODE] to set system to off.
Press and hold [FAN] and [MODE] for three seconds
to enter system test mode. Note: Buttons will not be
shown in humidistat mode. Press in the same area that
the button would be displayed.
The screen of the first test step is displayed:
TEST NUMBERMODEL
OUTPUT
STATE
(SW1 SETTING)
STAGE
FLASHES
IF 24VAC
IS NOT
PRESENT
The test number is displayed on the upper left, and the
output state is displayed in the message center.
Press
output, press
Press
to turn on the output (01). For multi stage
again to turn on the 2nd stage (02).
to turn off all the outputs (00).
Press [BACK] or [NEXT] to change to the next test
step.
When the last step is done, press [NEXT]. The
message “installer test complete“ will display.
All minimum on and off timers will be reset after
returning from system test mode.
Note: Second stage will only be displayed when the
thermostat is set to multi-stage mode.
Test NumberThermostat System Test
60Heating equipment test
61Cooling equipment test
62Auxiliary equipment test (HP only)
63Fan equipment test
Test NumberHumidistat System Test
70Humidification equipment test
71Dehumidification equipment test
SYSTEM TEST TABLES
Test 60: Heating Equipment Test
Button
Press
1st UP
press
2nd UP
press
Equipment
Type
Heat Cool
Heat PumpONONON
Heat Cool
Heat Pump
Stages
Heat
Type
GasONON
ElectricONONON
1
GasONONON
2
ElectricONONONON
1
2ONONONON
Test 61: Cooling Equipment Test
Button
1st UP
2nd UP
Press
press
press
Equipment
Type
Heat CoolONONON
Heat PumpONONON
Heat Cool
Heat Pump
StagesWW2YY2GOB
1
2ONONONON
1
2ONONONON
Test 62: Auxiliary Equipment Test (HP only)
Button
1st UP
2nd UP
Press
press
press
Equipment
Type
Heat Pump
Heat Pump
Heat
Type
GasONON
ElectricONONON
GasONONON
ElectricONONONON
Test 63: Fan Equipment Test
Button
Press
1st UP
press
WW2YY2GOB
WW2YY2GOB
WW2YY2GOB
ON
Test 70: Humidifier Equipment Test
Button
Press
1st UP
press
WW2YY2GOB
ONONON
Test 71: Dehumidifier Equipment Test
Button
Press
1st UP
press
1213
WW2YY2GOB
ONONON
Page 8
QUICK REFERENCE TO CONTROLS & DISPLAY
QUICK REFERENCE TO CONTROLS & DISPLAY
HOME SCREEN
FAN MODE
BUTTON
FAN MODE
SETTING
SYSTEM MODE
BUTTON
SYSTEM MODE
SETTING
EQUIPMENT
STATUS
MESSAGE
CENTER
(SCROLLING TEXT)
LOW BATTERY
INDICATOR
MAIN MENU
CURRENT DAY
NOTE: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
OUTDOOR TEMPERATUREROOM TEMPERATURE
CURRENT TIME & DATEMAIN MENU BUTTON
ROOM RELATIVE HUMIDITY
TEMPERATURE SETTING
TEMPERATURE
ADJUSTMENT
HOLD BUTTON
(IN PROGRAMMABLE MODE
SETS OR CLEARS HOLD)
NETWORK OVERRIDE
(IN NON-PROGRAMMABLE MODE)
HEAT PUMP MODE ONLY
EMERGENCY/AUXILIARY
HEAT (RED)
INDICATOR SHOWS THROUGH HOUSING
HUMIDISTAT
The Model 8800 has the option of being configured as a humidistat that can control a humidifier and dehumidifier.
Note: The 8800 is set to operate as a humidistat through the installer setup menu.
ROOM RELATIVE HUMIDITY
MESSAGE
CENTER
(SCROLLING TEXT)
CURRENT TIME
& DATE
ROOM RELATIVE HUMIDITY SETPOINTCURRENT DAY
HUMIDIFIER ADJUSTMENT
OUTDOOR TEMPERATURE
DEHUMIDIFIER ADJUSTMENT
NETWORK OVERRIDE
(IF ENABLED)
MAIN MENU BUTTON
CLEAN SCREEN
(LOCKOUT TOUCH SCREEN
FOR 30 SECONDS)
SET VACATION HOLD
(HOLD–TO TIME AND DATE)
SET SCHEDULE
BUTTON
USER SYSTEM SETTINGS
SET CURRENT TIME
SET CURRENT DATE
DONE BUTTON
(EXIT MENU)
1415
Page 9
THERMOSTAT FEATURES
TROUBLESHOOTING
• Large touch screen with adjustable backlight.
• Message center provides feedback and instructions.
• 7 day programmability or separately programmable
weekday/weekend schedules.
• Thermostat can be removed from the wall for easy
programming (batteries must be installed).
• Front battery door access for fast, easy replacement.
• Displays room temperature, room humidity,
temperature setting, and optional outdoor temperature.
• Air filter, humidifier, dehumidifier, and HVAC service
indicators.
• Programmable fan control with fan circulation mode.
• Easy to use temperature control can override program
schedule at any time.
• Progressive recovery ensures proper temperature at
the start of a program event.
• Built in compressor protection prevents damage to
your equipment.
• Battery back-up.
• System test mode.
• RS485 communications ready.
• Universal system compatibility.
• Configurable to control a humidifier or dehumidifier.
DISPLAY IS BLANK
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling
system is on.
• Make sure furnace door is closed securely.
TEMPERATURE SETTINGS DO NOT CHANGE
Make sure heating and cooling temperatures are set to
acceptable ranges:
• Heat: 40° to 90°F (4° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
HEATING SYSTEM DOES NOT RESPOND
(“HEATING” APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the secondary
side of the transformer between power and
common. If voltage is not present, check the heating
equipment to find the cause of the problem.
• Check for 24VAC between the heat terminal (W)
and the transformer common. If 24VAC is present,
the thermostat is functional. Check the heating
equipment to find the cause of the problem.
• Check for loose or broken wires between the
thermostat and the heating equipment.
FAN DOES NOT TURN ON IN A CALL FOR HEAT
• Check System Setting 09 (Fan Control), to make sure
the fan control is properly set to match the type of
system (see page 9).
HEAT PUMP ISSUES COOL AIR IN HEAT MODE,
OR WARM AIR IN COOL MODE
• Check wiring at the terminal block to confirm the
reversing valve is connected to the proper terminal.
O is active in cooling and B is active in heating.
HEAT/COOL BOTH ON AT SAME TIME
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 8).
• Check to make sure heating and cooling wires are
not shorted together.
HEATING EQUIPMENT IS RUNNING IN
COOL MODE
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 8).
COOLING SYSTEM DOES NOT RESPOND
(“COOLING” APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the secondary
side of the transformer between power and
common. If voltage is not present, check the cooling
equipment to find the cause of the problem
• Check for 24VAC between the cooling terminal (Y)
and the transformer common. If 24VAC is present,
the thermostat is functional. Check the cooling
system to find the cause of the problem.
• Check for loose or broken wires between the
thermostat and the cooling equipment.
1617
“HEATING” IS NOT DISPLAYED
• Check Installer System Setting number 05
(Control Setup) is set correctly.
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature.
“COOLING” IS NOT DISPLAYED
• Check Installer System Setting number 05
(Control Setup) is set correctly.
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature.
Page 10
ERROR CODES
SPECIFICATIONS
If the thermostat enters an error mode, all outputs are turned off. The thermostat attempts to recover every 10 minutes.
If the error does not clear, use the reset button. This will return all settings back to factory default.
Error codeMessageError Description
01
02Shorted temperature sensor circuit
03“RH SENSOR ERROR”Invalid response from the RH sensor
04“EEPROM ERROR”Error in permanent memory
05“SENSOR ERROR”
“SENSOR ERROR”
All controlling support modules are unresponsive and
Open temperature sensor circuit
the built-in sensor is not used as a backup option
Environment
Temperature
Relative humidityOperating: 5% to 90% R.H. (non-condensing)
Operating voltage24VAC (18 – 30VAC)
Current
Battery back-upAA size alkaline battery x 2
Outdoor & Remote temperature sensorMaximum distance: 300 feet
Room temperature measurementDisplay range: 32° to 99°F (0° to 40°C)
Outdoor temperature measurementDisplay range: -20° to 130°F (-30° to 55°C)
Setpoint temperature range
Setpoint humidity range
Operating: 32° to 120°F (0° to 48.9°C)
Shipping: -30° to 150°F (-34.4° to 65.5°C)
Electrical
Maximum: 2.5A (total), 1.0A (single output)
Maximum surge current: 5A
Thermal
Heat: 40° to 90°F (4° to 32°C)
Cool: 50° to 99°F (10° to 37°C)
Humidification: 10% to 90% R.H.
Dehumidification: 10% to 90% R.H.