8400 Series Thermostats Safety & Installation Instructions READ AND SAVE THESE INSTRUCTIONS 61000652D 8400 Tstat Install.
Table of contents Installation Installation location recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outdoor temperature sensor (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermostat mounting . . .
Installation Installation location recommendations Thermostat should be mounted: Do not mount thermostat: • On an interior wall, in a frequently occupied space. • Behind doors, in corners, or other dead air spaces. • Approximately 5‘ above floor. • In direct sunlight, near lighting fixtures, or other appliances that give off heat. • At least 18” from outside wall. • Thermostat can be mounted to a vertical junction box. • On an outside or unconditioned area wall.
Installation Outdoor temperature sensor (optional) • Install on side of building out of direct sunlight (north side recommended). Outdoor temperature can be measured by attaching an 8052 sensor to the S1 and S2 terminals. System setting #05 (Remote sensor) is used to enable sensor. • Mount above snow line. Heat pump models can use the outdoor temperature to effectively utilize the heat pump: • Mount at least 3’ away from exhaust vents and condensing lines.
Installation Thermostat mounting Power & Reset options The thermostat is dual power. It can either be AC or battery powered, or both (to provide backup power for the clock). Batteries are optional if the thermostat was connected to AC power when installed. For heat pump models (8446 and 8465) and universal models (8448 and 8466) used in heat pump applications 24 VAC must be connected in order for the system fault and emergency heat indicators to operate.
Installation Wiring terminal Wire specifications 18-24 gauge thermostat wire 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.
Installation Wiring – Model 8463 & 8444 Two Transformers (Remove Jumper Wire) Y G OUTDOOR TEMP SENSOR W FAN HEATING RC R COOLING C S1 S2 COOLING TRANSFORMER Y G OUTDOOR TEMP SENSOR W FAN HEATING RC R COOLING JUMPER TRANSFORMER HEATING TRANSFORMER Wiring – Model 8463 & 8444 Single Transformer (use jumper wire) C S1 S2 7 61000652D 8400 Tstat Install.
Installation Wiring – Model 8465 & 8446 Two Transformers (Remove Jumper Wire) G FAULT DETECT Y REVERSE VALVE W OUTDOOR TEMP SENSOR FAN RC R AUX HEATING C S1 S2 O/B L COMPRESSOR G FAULT DETECT Y REVERSE VALVE FAN W OUTDOOR TEMP SENSOR AUX HEATING RC R COMPRESSOR JUMPER HEAT PUMP TRANSFORMER TRANSFORMER AUX HEATING TRANSFORMER Wiring – Model 8465 & 8446 single Transformer (use Jumper Wire) C S1 S2 O/B L 8 61000652D 8400 Tstat Install.
Installation Wiring – Model 8466 & 8448 TWO TransformerS (REMOVE Jumper Wire) for HEAT/COOL System G 2nd HEATING Y 2nd COOLING W NOT USED RC R NOT USED FAN C S1 S2 O/B L W2 Y2 OUTDOOR TEMP SENSOR 1st HEATING 1st COOLING COOLING TRANSFORMER 2nd HEATING 2nd COOLING G NOT USED Y NOT USED FAN W OUTDOOR TEMP SENSOR 1st HEATING RC R 1st COOLING JUMPER TRANSFORMER HEATING TRANSFORMER Wiring – Model 8466 & 8448 single Transformer (use Jumper Wire) for HEAT/COOL System C S1 S2 O/B L W2
Installation Wiring – Model 8466 & 8448 single Transformer (use Jumper Wire) for HEAT PUMP System 2nd COMPRESSOR FAULT DETECT 2nd AUX HEATING G REVERSE VALVE Y OUTDOOR TEMP SENSOR FAN 1st AUX HEATING RC R W 1st COMPRESSOR C S1 S2 O/B L W2 Y2 HEAT PUMP TRANSFORMER 2nd COMPRESSOR FAULT DETECT G 2nd AUX HEATING Y REVERSE VALVE FAN W OUTDOOR TEMP SENSOR 1st AUX HEATING RC R 1st COMPRESSOR JUMPER HEAT PUMP TRANSFORMER HEATING TRANSFORMER Wiring – Model 8466 & 8448 TWO TransformerS (RE
Setup & Testing System setup instructions The following instructions show how to enter the system setup menu and change settings. The table on the following pages lists the settings and their details. Default settings are shown in bold. Some settings are only available to certain models, and some are specific to thermostats set to heat pump mode. How to enter the system setup menu to change system settings Press repeatedly until system is set to OFF. Press and hold and for three seconds.
Setup & Testing System setup instructions (continued) Thermostat models 8448 & 8466 have the option of being used in heat pump or heat/cool systems. The equipment type switch located on the back of the thermostat’s face is used to select this. System setting number 00 will only be shown on these models to display the position of the equipment type switch. EQUIPMENT TYPE SWITCH HEAT PUMP HEAT/COOL 12 61000652D 8400 Tstat Install.
Setup & Testing System setup instructions (continued) System setting Setting range, default in bold 00 Equipment type (8466, 8448) (Set by the equipment type switch) 0 : heat/cool 1 : heat pump 0 : Fahrenheit 1 : Celsius 0 : Gas or oil furnace (Equipment controls fan) Note: Used for Dual Fuel applications 1 : Electric (Thermostat controls fan) 0° : No offset applied –4°F to +4°F (–2°C to +2°C) 0 : Auto changeover mode is disabled 1 : Auto changeover mode is enabled 0 : No outdoor temperature sensor at
Setup & Testing System setup instructions (continued) System setting Setting range, default in bold 09 1st stage differential 1°F (0.5°C) 1°F to 4°F (0.5°C to 2°C) 10 2nd stage differential (8448, 8466) 1°F (0.5°C) 1°F to 4°F (0.5°C to 2°C) 11 3rd and 4th stage differential (8448HP, 8466HP) 1°F (0.5°C) 1°F to 4°F (0.
Setup & Testing System setup instructions (continued) System setting Setting range, default in bold 16 Low Balance Pt. (8446, 8448HP, 8465, 8466HP) 20°F (–7°C) 1°F to 35°F (–17°C to 1°C) or “OFF” to disable System setting 05 must be enabled 17 High Balance Pt. (8446, 8448HP, 8465, 8466HP) System setting 05 must be enabled 60°F (16°C) 40°F to 80°F (4°C to 27°C) or “OFF “ to disable 19 Program format (8463, 8465, 8466) 0 – 5/2 program (Weekdays and Weekends) 1 – 5/1/1 program (Weekdays, Sat.
Setup & Testing System test mode The system test mode is used to test a system after installation. The outputs of the thermostat can be manually activated one at a time to test their function. The following instructions show how to enter the test mode and turn outputs on and off. The charts on the following pages show all of the options for each model.
Setup & Testing System test mode (continued) How to enter the system test menu Press repeatedly until system is set to OFF. Press and hold and for three seconds. The screen of the first test step #50 is displayed: Press to turn on the output (01). For multi stage output, press again to turn on the 2nd stage (02). Press to turn off the output (00). Press to change to the next test step. Press displayed. after the last test step.
Setup & Testing Test steps for 8444 & 8463 System Setting Step #50 Heat #51 Cool #52 Fan Key Input [UP] #2 01 HEATING ON (W) 0 : Gas ON 1 : Elec ON [DOWN] [UP] [DOWN] [UP] [DOWN] Display (Output) 01 COOLING ON (Y) 01 FAN ON (G) ON ON ON ON 18 61000652D 8400 Tstat Install.
Setup & Testing Test steps for 8448HC & 8466HC System Setting Step Key Input 1st [UP] #50 Heat #51 Cool #52 Fan 2nd [UP] #2 0 : Gas 1 : Elec 0 : Gas 1 : Elec [DOWN] 1st [UP] 2nd [UP] [DOWN] [UP] [DOWN] 01 HEATING ON (W) ON ON ON ON 02 HEATING ON (W2) Display (Output) 02 01 COOLING COOLING ON (Y2) ON (Y) 01 FAN ON (G) ON ON ON ON ON ON ON ON ON ON 19 61000652D 8400 Tstat Install.
Setup & Testing Test steps for 8446 & 8465 System Setting Step #50 Aux Key Input [UP] #2 #12 0 : Gas 1 : Elec 01 AUX HEATING ON (W) ON ON Display (Output) 01 COOL/HEAT ON (Y) 01 FAN ON (G) O/B ON [DOWN] [UP] #51 Cool [DOWN] [UP] #52 Heat [DOWN] #53 Fan [UP] [DOWN] 0:O 1:B 0:O 1:B 0:O 1:B 0:O 1:B ON ON ON ON ON ON ON ON ON ON ON ON ON 20 61000652D 8400 Tstat Install.
Setup & Testing Test steps for 8448HP & 8466HP System Setting Step Key Input 1st [UP] #50 Aux 2nd [UP] #2 #12 0 : Gas 1 : Elec 0 : Gas 1 : Elec 01 AUX HEATING ON (W) ON ON ON ON 02 AUX HEATING ON (W2) Display (Output) 02 01 COOL/HEAT COOL/HEAT ON (Y2) ON (Y) 01 FAN ON (G) O/B ON ON ON ON [DOWN] 1st [UP] #51 Cool 2nd [UP] [DOWN] 1st [UP] #52 Heat 2nd [UP] [DOWN] #53 Fan [UP] [DOWN] 0:O 1:B 0:O 1:B 0:O 1:B 0:O 1:B 0:O 1:B 0:O 1:B ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON
Quick Reference to controls & Display Non-Programmable models (8444, 8446, 8448) Current Indoor Temperature Outdoor Temperature (OPTIONAL) System Mode Setting Temperature SetTING Equipment Status System Mode UP Fan Setting down Heat pump models only Emergency heat (RED) Fan Setting System FAULT (YELLOW) Indicator shows through housing Quick Reference Card Battery Door Message Center 22 Low Battery Warning Note: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
Quick Reference to controls & Display Programmable models (8463, 8465, 8466) Current Indoor Temperature Current Time Outdoor Temperature (OPTIONAL) System Mode Setting Temperature SetTING Fan Setting Equipment Status UP System Mode down Fan Setting Hold Program Heat pump models only Emergency heat (RED) System FAULT (YELLOW) Current Schedule Period Indicator shows through housing Quick Reference Card Battery Door Message Center Low Battery Warning Note: BACKLIGHT IS ACTIVATED WITH FIRST
Thermostat Features All 8400 series thermostats • Large, clear, backlit display is easy to read – even in the dark. • Displays room temperature, temperature setting, and optional outdoor temperature. • Dual power option (Battery or 24 VAC). • Front battery door access for fast, easy replacement. • Built in compressor protection. • Circulation fan mode for air cleaning. • Water panel, dehumidifier, air filter, and HVAC service indicators.
Troubleshooting 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. • If thermostat is battery powered, make sure fresh AA alkaline batteries are correctly installed.
Troubleshooting Cooling system does not respond (“COOLING” appears on screen) • Check for 24 VAC 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 24 VAC between the cooling terminal (Y) and the transformer common. If 24 VAC is present, the thermostat is functional. Check the cooling system to find the cause of the problem.
Specifications Environment Temperature Relative humidity Operating: 32° to 120°F (0° to 48.9°C) Shipping: -30° to 140°F (-34.4° to 60°C) Operating: 5% to 90% R.H. (non-condensing) Electrical Operating voltage Current 24 VAC (18 – 30 VAC) Maximum: 2.5A (total), 1.0A (single output) Maximum surge current: 5A Dual power. Can be battery or 24 VAC powered. Power supply Battery power When both the sources are available, battery will be used as back up power.
Specifications Thermal Outdoor temperature sensor Maximum distance: 300 feet Room temperature measurement Display range: 32° to 99°F (0° to 40°C) Outdoor temperature measurement Display range: -20° to 130°F (-30° to 55°C) Temperature setting range Heat: 45° to 90°F (7° to 32°C) Cool: 50° to 99°F (10° to 37°C) P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357 www.aprilairepartners.com 61000652 7.
