Robertshaw 9420 User manual
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Robertshaw 9420 is a 2-stage heat pump thermostat designed to control 24 VAC heat pump systems. It features a large backlit display, adjustable temperature differentials, a 2nd stage delay option, and compressor short cycle protection. The thermostat is compatible with zone systems as a master thermostat and has permanent memory retention. Additionally, it offers Fahrenheit/Celsius display options and an adjustable temperature range from 45°F to 90°F (7°C - 32°C).
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0420 "um THERMOSTAT HEAT PUMP 2 Heat / 2 Cool UE: User's Manual Quick Start Installation «= ЕЕ» 110-1044B Application The Robertshaw 9420 is a multi-stage thermostat designed to control 24 VAC heat pump systems. Features Summer and winter setpoints * Large back lit display * Adjustable 1S! stage temperature differential: 0.5%F to 3.0% (0.5%C to 1.5%) * Adjustable 2nd stage temperature differential: 1°F to 6°F (0.5°C to 3.0°C) * Adjustable 2"1 stage delay (10-40 min.) * Compressor short cycle protection * Accuracy within +19 * Zone system compatible as a master thermostat * Permanent memory retention * Fahrenheit/Celsius display option * Adjustable from 45°F to 90°F (7°C - 32°C) * Quick wire terminal block e Automatic heating shutdown if temperature exceeds 94°F (34°C) Downloaded from www.Manualslib.com manuals search engine Á IMPORTANT SAFETY INFORMATION WARNING: * Always turn off power at main fuse or circuit breaker panel before Installing, removing, cleaning, or servicing thermostat. * Read all the information in this manual before installing this thermostat. * This is a 24 VAC low-voltage thermostat. Do not install on voltages higher than 30 VAC. All wiring must conform to local and national building and electrical codes and ordinances. * 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. * Do not connect ground to any terminal in this unit. Step 1: Replacing Existing Thermostat 1. Turn off power to heating and cooling system. 2. Remove cover from old thermostat to expose wires (Figure 1). J и Figure 1 3. Disconnect wires one at a time from existing terminals. Use enclosed labels to mark existing wires. Refer to cross references in Table 1 if existing wiring does not directly match the labels. 4, Remove existing thermostat base from wall. Old Terminal | New Label Description R, V-VR or VR-R R 24 VAC, Return Y, Y1 or M Y1 Compressor Relay (Stage 1) OorR 0 Reversing Valve (Cool Active) B B Reversing Valve (Heat Active) Рог С G Fan Control Relay Y2 Y2 2nd Stage Cooling Circuit W2 or W-U W2 2nd Stage Heating Control С, Хог В С 24 VAC, Transformer Common Side LorX L System Monitor E E Emergency Heating Circuit NOTE: THIS THERMOSTAT REQUIRES A 24V COMMON WIRE FOR PROPER OPERATION. Table 1 Downloaded from www.Manualslib.com manuals search engine © Recycling Thermostat If this thermostat is replacing a thermostat that contains mercury In a sealed tube, do not place your old thermostat in the garbage. Contact your local waste management authority for instructions regarding proper disposal of the thermostat. If you have any ques- tions, call Robertshaw technical support at 1-800-445-8299. Step 2: Installing Model 9420 Thermostat NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, FIVE 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 LOCATIONS WILL AFFECT THERMOSTAT OPERATION. 1. Turn power off to the heating and cooling systems. 2. Place EMER-HEAT-OFF-COOL in OFF position (Figure 2). 3. Place #& -ON-AUTO switch into AUTO position (Figure 2). ~— ™ ——— Figure 2 4. Remove the cover using a coin or screwdriver (Figure 3). Set aside. Figure 3 Downloaded from www.Manualslib.com manuals search engine 5. Place thermostat against the wall at desired location. Make sure wires will feed through opening (Figure 4) on base of thermostat. 6. Mark placement of mounting holes (Figure 4). Set base aside. Mounting Holes—— —_— jé BE О ORO = ree HD Ц * [ORO = 9 ) vu оо (889. A OUI Figure 4 1. If mounting on drywall, tap plastic anchors into wall. NOTE: ENCLOSED PLASTIC ANCHORS DO NOT REQUIRE A DRILLED HOLE FOR DRYWALL. 8. If mounting on a surface other than drywall, drill the marked holes using a 3/16" drill bit. 9. Align base with plastic anchors and feed wires through opening. 10. Secure base to wall with supplied screws. NOTE: THE THERMOSTAT WILL MOUNT HORIZONTALLY ON A SINGLE GANG JUNCTION BOX. 11. Strip end of wires 5/16” if needed. 12. Terminal screws are already loose and ready for wire insertion. Insert wires into terminal strip (Figure 5) matching the label to the corresponding terminal (see Wiring Diagrams). Tighten screws. 13. Make sure wire connections are secure. 14. Push excess wire back through opening. OPO L C о ооо Figure 5 Downloaded from www.Manualslib.com manuals search engine e Wiring Diagrams 9420 WIRING SAMPLE #1 Typical heat pump with cool active reversing valve and auxiliary/emergency heat. 9420 WIRING SAMPLE #2 Typical heat pump with heat active reversing valve and auxiliary/emergency heat. 9420 WIRING SAMPLE #3 Typical heat pump with cool active reversing valve and auxiliary/emergency heat. Does not have separate wire for emergency heat (jump W2 & E). Jumper 9420 WIRING SAMPLE #4 Typical heat pump with cool active reversing valve, auxiliary/emergency heat and second stage of cooling. System fault indicator connected (L terminal). Downloaded from www.Manualslib.com manuals search engine TERMINAL LEGEND - 9420 TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION C 24VAC common connection Yes For input of 24VAC common side of transformer L System fault indicator connection | No For connection of system fault indicator (if present) R 24VAC hot connection Yes For input of 24VAC hot side of transformer Y2 Second stage cooling connection | No Energizes on a call for second stage cooling Y1 First stage compressor connection| Yes Energizes on a call for first stage of heating and cooling E Emergency heat connection No* Energizes on a call for heat in the EM mode only G Indoor fan connection Yes Energizes with E, Y1, Y2 and W2 terminals or with FAN option switched to the ON position W2 | Second stage heat connection No* Energizes on a call for second stage of heat (auxiliary heat) 0 Cool active reversing Yes** | Energizes when in the in valve connection COOL mode B Heat active reversing Yes** | Energizes when in the valve connection HEAT or EM modes * For systems using a backup heat source. If separate E terminal connection is not available, jumper E and W2. ** Most heat pump systems will have a cool active or a heat active reversing valve. Use the appropriate terminal. 15. Replace thermostat cover by snapping into place. 16. Turn on power to system. Test thermostat as described in the following section. Step 3: Testing the Thermostat A 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 EMER-HEAT-OFF-COOL switch into the COOL position. The display will read COOL. MER HEAT 2. Press the V button until the temperature setting OFF Is at least 3 degrees below the room temperature. ВЫ The air conditioning system should turn on within a few seconds. The snowflake icon # will be displayed (* 1st stage cooling; ** 2"1 stage cooling). 6 Downloaded from www.Mamnualslib.com manuals search engine NOTE: 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. TO OVERRIDE THE 5-MINUTE DELAY FOR INSTALLATION, PRESS THE RESET BUTTON. 3. Put the EMER-HEAT-OFF-COOL switch into the OFF position. The air conditioning system should turn off. The display will read SYSTEM OFF. 4. Put the EMER-HEAT-OFF-COOL switch into the HEAT position. The display will read HEAT. 5. Press the /\ button until the temperature setting is at least 3 degrees above room temperature. The heating system should turn on. The fan may not turn on immediately, depending on the fan delay built into the furnace. The flame icon à will be displayed (0 1st stage heating; à à 29 stage heating). 6. Put the EMER-HEAT-OFF-COOL switch into the OFF position. The heating system should turn off. The fan may continue to run for a short period of time. The display will read SYSTEM OFF. 7. Putthe € -ON-AUTO switch into the ON position. The blower fan should turn on. The display will show a *€ and ON. 8. Put the € -ON-AUTO switch into the AUTO position. The blower fan should turn off. Downloaded from www.Manualslib.com manuals search engine EMER HEAT OFF COOL EMER HEAT OFF COOL ) EMER HEAT OFF cooL "e D D oO = AUTO © = AUTO Step 4: Customizing the Thermostat + Settings System Cool: The thermostat controls the cooling. Off: The heating and cooling systems are off. Heat: The thermostat controls the heat. Emer: The thermostat controls the second stage emergency heat. Used only when the primary stage of heat Is not functioning or requires service. The display shows EMER when emergency heat Is activated. Fan Auto: Equipment controls the fan. On: The fan operates continuously. Temperature Heating: The default temperature for heating is 70°F (21°C). To change the default setpoint, put the system switch in HEAT and press the /\ or V button to adjust the temperature setting up or down. The display will show SET. The display will return to the current room temperature three seconds after the last input and the new setpoint will be saved. Cooling: The default temperature for cooling is 78°F (25°C). To change the default setpoint, put the system switch in COOL and press the Nor V button to adjust the temperature setting up or down. The display will show SET. The display will return to the current room temperature three seconds after the last input and the new setpoint will be saved. Figure 7 Downloaded from www.Manualslib.com manuals search engine + Temperature Differential 2nd Stage Delay The temperature differential is factory set at 1.0°F (.5°C) for the 1st stage differential and 2°F (1°C) for the 2nd stage. This means that whenever the room temperature changes by one degree Fahrenheit from the tempera- ture setting, the system will turn on. If the system turns on too often, increase the temperature differential. This thermostat is equipped with an adjustable 2nd stage time delay. The delay is factory set at 20 minutes. The time delay setting prevents the 2nd stage system from activating until the delay time has expired. If the 2nd stage Is turning on too often, increase the time delay. The 2nd stage will turn on when the room temperature changes from the desired temperature by the sum of the 1st and 2nd stage differential settings. The 2nd stage also will turn on if the temperature has not increased (or decreased in the event of cooling) for a period of 20 minutes. + Changing Fahrenheit (°F) to Celsius (°C), Temperature Differential, and 2nd Stage Delay 1. The thermostat is preset to display the temperature in degrees Fahrenheit (US models) or degrees Celsius (Canadian models). The temperature display can be changed. Press and hold both the A and V button for three seconds. The display will read F or C. Release buttons. Press the /\ or \/ button to switch the display. 2. After three seconds the display will switch to the 1st stage differential settings. The display will read DIFFERENTIAL 1st. The temperature differential is factory set at 1.0°F (0.5°C). Press the /\ or \/ button to adjust the differential up or down. 3. After three seconds the display will switch to the 2nd stage differ- ential setting. The display will read DIFFERENTIAL 2nd. The temper- ature differential is factory set at 2°F (1°C). Press the /\ or V button to adjust the differential up or down. 4. After 3 seconds, the display will switch to the 2nd stage delay setting. The second stage delay is factory set at 20 minutes. Press the /\ or \/ button to adjust the time delay in 5 minute increments. 5. Wait three seconds or press *€ and the display will return to the original room temperature. + Backlit Display This thermostat is equipped with a backlight to make nighttime temper- ature adjustments quick and easy. Press the Y button to activate the backlight. The backlight will turn off after about 5 seconds of inactivity. Downloaded from www.Manualslib.com manuals search engine + Reset To reset the thermostat press the RESET button located just below the lower left corner of the display. — ll NS —— So О me 20 | О oy Of | °° OHO | | q © — Reset Switch Step 5: Troubleshooting Symptom Remedy Thermostat does not turn on system. | Check wiring (see Installation section). Thermostat turns system on and Increase temperature differential off too frequently. (see Changing the Temperature Differential section). Display shows CHECK Monitors system status. Call your local HVAC service provider. Thermostat does not display Check F/C (Fahrenheit/Celsius) proper room temperature. setting. See Changing Fahrenheit (F) to Celsius (C). If problems with thermostat cannot be resolved, call: Technical Support: (800) 445-8299 Monday-Friday 7:30 AM - 5:30 PM CST 10 Downloaded from www.Manualslib.com manuals search engine Two Year Limited Warranty Climate Controls Americas warrants to the original contractor Installer, or to the original consumer user, each new Robertshaw thermo- stat to be free from defects in materials and workmanship under normal use and service for a period of two (2) years from date of purchase. This warranty and our liability does not apply to batteries or merchandise that has been damaged by misuse, neglect, mishandling, alterations, improper installation, or use in a way other than in accordance with Climate Controls Americas recommendations and instructions. Climate Controls Americas agrees to repair or replace at its option any thermostat under warranty provided it is returned within the warranty period, postage prepaid, with proof of the date of purchase. Cost of thermostat removal or reinstallation is not the responsibility of Climate Controls Americas. Repair or replacement as provided under this warranty is the exclusive remedy of the consumer. Climate Controls Americas shall not be liable for any incidental or consequential damages for breach of any express or implied warranty on this product, or under any other theory of liability. Except to the extent prohibited by applicable law, any implied warranty of merchantability or fitness for a particular purpose on this product is limited to the duration of this warranty. Some states do not allow the exclusion or limitation of incidental or consequential damages, or allow limitations on how long an implied war- ranty lasts, so the above limitations or exclusions 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. For warranty returns, send thermostat, shipping prepaid to: Invensys Climate Controls Americas Warranty Claims Department 515 S. Promenade Corona, CA 91719 Invensys Climate Controls Americas 191 E. North Avenue Carol Stream Illinois 60188 United States of America ©2003 Climate Controls Americas 110 -1044B 11 Downloaded from www.Manualslib.com manuals search engine NOTES 12 Downloaded from www.Manualslib.com manuals search engine
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