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Manafacture: Robertshaw
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manual abstract
Contact your local waste management authority for instructions regarding proper disposal of the thermostat. If you have any questions, 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). 4. Remove the cover using a coin or screwdriver (Figure 3). Set aside. 3 Figure 3 SETTING OR CHANGING THE SETPOINT TEMPERATURE: 1. Press or button. Display will show SET and the current temperature setpoint. 2. Press or button to adjust temperature setpoint. 3. After completing the change, the display will return to the current room temperature after a few seconds. CHANGING THE TEMPERATURE DIFFERENTIAL, DEAD BAND, AND RESIDUAL COOL: The temperature differentials are factory set at 1°F and 2°F for 1ST and 2ND stages respectively. The dead band for Autochangeover is set at 3°F. To change settings: 1. Press the and buttons at the same time and hold for 1 second. Display will indicate: DIFFERENTIAL 1ST. 2. Press either the or button to adjust the 1st stage differential between 0.5°F – 3°F (0.5°C - 1.5°C). 3. Either wait five seconds or press the button. The display will indicate: DIFFERENTIAL 2ND. 4. Press either the or button to adjust 2nd stage differential between 1°F – 6°F (1°C - 3°C). 5. Either wait five seconds or press the button. The display will indicate: DEADBAND. 6. Press either the or button to adjust the dead band between 3°F – 6°F (1.5°C - 3°C). 7. Either wait five seconds or press the button. The fan icon and ON will be displayed. 8. Press either the or button to adjust the Residual Cool fan delay between 0, 30, 60, or 90 seconds. 9. The display will return to the current room temperature after a few seconds. Item 9555 120-1523 Maple Chase Company Tech Service: 1-800-445-8299 M-F 7:30 a.m. - 5:30 p.m. CST MADE IN MEXICO TM Figure 2 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 WIRING OPENING Figure 4 7. 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. Y2 CL R Y1 E W2 G O B Label Y Figure 5 4 . Wiring Diagrams 9420 WIRING SAMPLE #1 Typical heat pump with cool active reversing valve and auxiliary/emergency heat. C L R Y2 Y1 E G W2 O B 9420 WIRING SAMPLE #2 Typical heat pump with heat active reversing valve and auxiliary/emergency heat. C L R Y2 Y1 E G W2 O B 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). C L R Y2 Y1 E G W2 O B 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). C L R Y2 Y1 E G W2 O B 5 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) O Cool active reversing valve connection Yes** Energizes when in the in COOL mode B Heat active reversing valve connection Yes** Energizes when in the HEAT or EM modes * For systems using a backup heat source. If separate E terminal connection is...