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APPLICATION
The T8511G Microelectronic Heat Pump Thermostat provides electronic control of 24 Vac, two-stage heating and one-
stage cooling heat pump systems. Refer to Table 1 for a general description of the thermostat. All T8511 Thermostats
require a common wire to supply power.
T8511
Changeover
G
Automatic
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old thermostat.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
®U.S. Registered Trademark •
Table 1. T8511 Thermostat Desription.
System Selection
Em. Heat-Heat-Off-Auto-Cool
not
place your old
• All Rights Reserved
Heat Pump Thermostats
Fan
Selection
On-Auto
Use keyboard to make system and
fan selections.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.
Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Wallplate Installation
Mount tthermostat horizontally on the wall or on a 2 in. x 4
in. wiring box.
1. Position and level the wallplate (for appearance
only). The thermostat functions properly even when
not level.
X-XX UL
Microelectronic
INSTALLATION INSTRUCTIONS
Comments
T8511G
69-0961-4
Table of Contents
Related Manuals for Honeywell T8511G
Summary of Contents for Honeywell T8511G
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Page 1: Wallplate Installation
APPLICATION The T8511G Microelectronic Heat Pump Thermostat provides electronic control of 24 Vac, two-stage heating and one- stage cooling heat pump systems. Refer to Table 1 for a general description of the thermostat. All T8511 Thermostats require a common wire to supply power. - Page 2 MICROELECTRONIC HEAT PUMP THERMOSTAT WIRES THROUGH WALL WALL ANCHORS Fig. 2. Mounting the wallplate. 2. Use a pencil to mark the mounting holes. See Fig. 2. 3. Remove the wallplate from the wall and drill two 3/16 inch holes in the wall (if drywall) as marked. For firmer material such as plaster or wood, drill two 7/32 inch holes.
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Page 3: Mounting Thermostat
THERMOSTAT OUTDOOR TEMPERATURE SENSOR COMPRESSOR CONTACTOR RELAY COOL CHANGEOVER VALVE HEAT CHANGEOVER VALVE POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. AVAILABLE ON SELECT MODELS. Fig. 3. Typical hookup in heat pump application. THERMOSTAT OUTDOOR TEMPERATURE SENSOR EM. HEAT RELAY COMPRESSOR CONTACTOR... -
Page 4: System And Fan Settings
Em. Ht.-Emergency heating Heat— Heating equipment Off — No equipment Cool—Cooling equipment Auto—Thermostat 1 CHECK LIGHT ON SELECT MODELS Fig. 10. T8511G (automatic changeover) system INCREASE NOTE: Always press the system and fan keys with your TEMPERATURE SETTING DECREASE TEMPERATURE... -
Page 5: Installer Setup
Not used. 01 thru 04 Heating cycle rate. Not used. 08 thru 11 Changeover (T8511G only). Not used. Degree temperature display. Not used. 15 thru 18 The cycle rate for the last stage of heat is adjustable with 6 as the factory setting. - Page 6 MICROELECTRONIC HEAT PUMP THERMOSTAT Table 2. Thermostat Installer Setup Options (Continued). Installer Setup Number (Press i key to change) Select Extended fan operation in heating. Extended fan operation in cooling. Not used. 21 thru 23 Outdoor temperature display. Not used. 25 thru 28 O/B terminal energized in...
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Page 7: Installer System-Test
INSTALLER SYSTEM-TEST Use the Installer System-Test to check the thermostat configurations and operation. Refer to Table 3 for a list of the available system-tests. To start the system-test: CAUTION Equipment Damage Hazard. Minimum compressor off-time is bypassed during the Installer System Test. Be aware that equipment damage can occur if the compressor is cycled too quickly. -
Page 8: Thermostat Information
MICROELECTRONIC HEAT PUMP THERMOSTAT Key To Test Press Number Fan Equipment System-Test Change from cooling to fan equipment system-test. Fan comes on. Fan turns off. System Key IMPORTANT Test numbers are displayed only when the system is configured for the selected function. EXAMPLE: Numbers 60, 61 and 62 are the only numbers that are displayed when a system is configured for heat only. -
Page 9: Troubleshooting Guide
5. Press the increase key again to display the EEPROM identification code (Example: 222 = EEPROM ID 222). 6. Press and hold the increase keys until the room temperature is displayed to exit the system-test. The system-test times out after five minutes without any key presses. - Page 10 MICROELECTRONIC HEAT PUMP THERMOSTAT TROUBLESHOOTING GUIDE (Continued) Symptom Possible Cause Thermostat minimum off-time is Heating will not activated. come on. (continued) System selection is not set to Heat. O/B terminal configured incorrectly O or B terminal miswired Cooling will not No power to the thermostat.
- Page 11 MICROELECTRONIC HEAT PUMP THERMOSTAT 69-0961—4...
- Page 12 Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarorough, Ontario M1V 4Z9 69-0961—4 G.H. Rev. 05-04 www.honeywell.com/yourhome...