Aprilaire 8334 Thermostat User Manual
Contents
1. cover of old thermostat to expose wires Do not disconnect wires Fig 1 3 Label wires per Table 1 Table 1 Old Label New Label Description M 4 RH R5 or R RH Heat Transformer hot side V or RC RC Cooling Transformer hot side Y or Y6 Y Cooling control H W or 4 W Heating control ForG G Fan control relay Cc Y or None Either cooling control or common side of transformer 0 0 Cool Active Reversing Valve B B Heat Active Reversing Valve NOTE On some older models the C terminal can be either the cooling control or the common side of the transformer Check furnace wiring diagram to verify C terminal If it is the common side of the transformer cap the wire and tuck into the wall If it is the cooling control connect to the Y terminal Figure 1 4 After labeling wires remove wires from terminals 5 Remove existing thermostat base from wall 6 Refer to the following section for instructions on how to install thermostat Installing Model 8334 Thermostat NOTE For new installations mount thermostat on inside wall 4 5 feet above the floor Do not 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 affect thermostat operation 1 Turn power off to the heating and cooling systems 2 Place COOL OFF HEAT In OFF position COOL OFF HEAT ae Zo J a 3 Place FAN AUTO O2. to Celsius C The thermostat is preset to display the temperature in degrees Fahrenheit You may change the display readout 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 2 Press RESET button located lust below the LCD display to register the change The display will change to show the temperature in your desired temperature scale To return the thermostat to its original setting repeat steps 1 and 2 above TROUBLESHOOTING Symptom Remedy Thermostat does not turn Check Wiring on system see INSTALLATION Check fuse Replace with 2 amp fuse if fuse has opened Thermostat turns on and off too frequently Increase Temperature Differential see 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 INSTALLATION Check F Fahrenheit C Celsius switch located at top center of circuit board for proper position If a new selection is made press RESET button located directly below LCD display Thermostat does not display proper room temperature If problems with thermostat cannot be solved call Technical Support 608 257 8801 Monday Friday 7 45 am 5 00 pm CST Wiring Diagrams The following is just a sample of the most common t
3. ELECTRONIC THERMOSTATS MODEL 8334 FP 1 Heat 1 Cool Digital Electric Gas E Ld lt a me User s Manual Installation and Operation UL IMPORTANT SAFETY INFORMATION WARNING e 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 e Read all of the information in this manual before installing or programming this thermostat e This is a 24V AC low voltage thermostat Do not install on voltages higher than 30V AC e All wiring must conform to local and national building and electrical codes and ordinances e 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 Features e Single Stage heat pump compatible e Zone system compatible as a master thermostat e Low battery indicator e Fahrenheit Celsius display option e Adjustable from 45 F 4 C to 90 F 32 C e Accuracy within 1 degree e Adjustable temperature differential 5 1 5 degree e Low temperature freeze protection While in heat mode thermostat will mechanically turn on heat if temperature drops to 40 F 4 C even if batteries are missing or drained e Automatic heating shutdown if temperature exceeds 90 F 32 C Replacing Existing Thermostat 1 Turn off power to heating and cooling system 2 Remove
4. N switch FAN AUTO ON Into AUTO position CT 4 Remove the cover using a coin or screwdriver Figure 2 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 Fig 3 Set base aside MOUNTING HOLES 7 Drill the marked holes using a 3 16 drill bit NOTE Enclosed plastic anchors do not require 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 11 Connect wires to terminal strip Refer to wiring diagrams on other side of this sheet Make sure wire connections are secure 12 Place fan option switch into either the ELEC or GAS position depending upon the type of furnace Refer to Figure 4 ELECTRIC GAS SWITCH 89GE0O09 u0 O figure 4 13 Put the F C switch to either F for Fahrenheit display or C for Celsius display readout F C SWITCH D8GE0O9 14 Put the HP NON HP switch to either the HP for Heat Pump or NON HP for furnace applications in the proper position HP NON HP Switch 9EE0909 1 O1 Install two AA ENERGIZER brand batteries or equivalent into bat tery compartment Be sure to match positive ends of batteries with positive battery terminals in the battery compartment 16 Replace cover o
5. OOL OFF HEAT system should turn off The fan may a continue to run for a short period of time FAN AUTO ON 7 Put the FAN AUTO ON switch to the ON position The blower fan CD should turn on 8 Put the FAN AUTO ON switch to the AUTO position The blower fan should turn off CB FAN AUTO ON Operation Setting or Changing the Setpoint Temperature 1 Press either the V or button The display will show the current temperature setpoint OFF HEAT FAN AUTO ON v COOL amp aD crs 2 Press either the Vor A button to adjust the temperature setting either up or down The display will return to the room temperature display five seconds after the last input and the new setpoint will be saved Changing Temperature Differential IMPORTANT The temperature differential is factory set at 1 5 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 WV and A buttons at the same time and hold for one second v 2 Press either the V or A button to adjust the temperature differential up or down The display will show Differential Setting Degrees 1 1 F 5 C 2 2 F 1 0 C 3 3 F 1 5 C The display will return to the room temperature five seconds after the last input Changing Fahrenheit F
6. cts Corporation Madison Wisconsin 53701 THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPO RATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE THERMOSTAT ITSELF IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PAR TICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID TWO YEAR PERIOD RESEARCH PRODUCTS CORPORATION S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OTHER THAN DAMAGES FOR PERSONAL INJURIES RESULTING FROM ANY BREACH OF THE AFORE SAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED THIS LIMITED WARRANTY IS VOID IF DEFECT S RESULT FROM FAILURE TO HAVE THIS THERMOSTAT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR IF THE LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above exclusion or limitations 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 WP RESEARCH PRODUCTS corporation PO BOX 1467 MADISON WI 53701 1467 Products For Better Indoor Air Quality B2202515 REV 12 00
7. nto thermostat by snapping into place 17 Turn on power to system Test thermostat as described in the following section To Test 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 Do not 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 switch into the COOL position 2 Press the VV button until the temperature setting is at least 3 degrees below the room temperature The air conditioning system should turn on within a few seconds NOTE When in the COOL mode or HEAT and COOL for single stage heat pumps once the thermostat turns off a built in 5 minute delay prevents the system from turning on again This protects the compressor No additional time delay relay is required COOL OFF HEAT CZD COOL OFF HEAT 3 Put the COOL OFF HEAT switch into the OFF position The air am conditioning system should turn off 4 Put the COOL OFF HEAT switch into the HEAT position 5 Press the A button until the CE temperature setting is at least lt 3 degrees above room temperature The heating system should turn on The fan may not turn on immediately depending upon the fan delay built into the furnace 6 Put the COOL OFF HEAT switch into the OFF position The heating COOL OFF HEAT C
8. ypes of HVAC systems Refer to your systems installation manual for wiring information HEAT COOL HEAT ONLY 4 WIRE 3 WIRE SINGLE TRANSFORMER SINGLE TRANSFORMER Factory Installed Factory Installed HEAT ONLY 2 WIRE COOL ONLY SINGLE TRANSFORMER 3 WIRE SINGLE TRANSFORMER NOTE Remove factory installed jumper T ie H Hot E 120 VAC R Control M O S T A T HEAT COOL 5 WIRE TWO TRANSFORMER HEATING m NOTE Cut center of factory installed jumper and bend back Transformer NOTE Both transformers must be in phase COOLING Transformer HEAT PUMP WITH HEAT PUMP WITH COOL ACTIVE HEAT ACTIVE REVERSING VALVE REVERSING VALVE Pre Installed jumper Pre Installed jumper NOTE Installer must place jumper NOTE Installer must place jumper between W and Y terminals between W and Y terminals Limited Warranty Your Research Products Corporation Aprilaire Thermostat unit is expressly warranted for two 2 years from date of installation to be free from defects in materials and workmanship Research Products Corporation s exclusive obligation under this warranty Shall be to supply without charge a replacement for any thermostat which is found to be defective within a two 2 year period and which is returned together with the date of installation no later than thirty 30 days after said two 2 year period by you to either your original supplier or to Research Produ
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