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Table of contents for the manual
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Page 1
DIGIT AL NON-PROGRAMMABLE THERMOST A T 9420 HEA T PUMP H NeW 2 Heat / 2 Cool User's Manual Quick Start Installation Application The Robertshaw 9420 is a multi-stage thermostat designed to control 24 V AC heat pump systems. Features • Summer and winter setpoints •L arge back lit display • Adjustable 1 st stage temperature differential: 0.[...]
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Page 2
IMPORT ANT SAFETY INFORMA TION W ARNING: • 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 V AC low-voltage thermostat. Do not install on voltages higher than 30 V AC. • All [...]
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Page 3
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 [...]
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Page 4
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. 7. If mounting on drywall, tap plastic anchors into wall. NOTE: ENCLOSED PLASTIC ANCHORS DO NOT REQUIRE A DRILLED HOLE FOR DRYW ALL. 8. If mounting on a[...]
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Page 5
5 T yp ical heat p um p with cool active reversin g valve and auxiliar y /emer g enc y heat. T yp ical heat p um p with heat active reversin g valve and auxiliar y /emer g enc y heat. T yp ical heat p um p with cool active reversin g valve and auxiliar y /emer g enc y heat. Does not have se p arate wire for emer g enc y heat (j um p W2 & E ) . [...]
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Page 6
15. Replace thermostat cover by snapping into place. 16. T urn on power to system. T est thermostat as described in the following section. Step 3: T esting the Thermostat W ARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS V AL VE OR SYSTEM CONTROL TO TEST OPERA TION. THIS WILL DAMAGE THE THERMOST A T AND VOID YOUR WARRANTY . CAUTION: DO NOT SW[...]
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Page 7
7 NOTE: ONCE THE THERMOST A T TURNS OFF , A BUIL T IN 5-MINUTE DELA Y PREVENTS THE SYSTEM FROM TURNING ON AGAIN. THIS PROTECTS THE COMPRESSOR. NO ADDITIONAL TIME DELA Y RELA Y IS REQUIRED. TO OVERRIDE THE 5-MINUTE DELA Y FOR INST ALLA TION, PRESS THE RESET BUTTON. 3. Put the EMER-HEA T -OFF-COOL switch into the OFF position. The air conditioning sy[...]
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Page 8
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[...]
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Page 9
9 ◆ T emperature Differential 2 nd 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, inc[...]
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Page 10
10 WIRING OPENING Reset Switch ◆ Reset To reset the thermostat press the RESET button located just below the lower left corner of the display . Step 5: T r oubleshooting Symptom Remedy Display shows CHECK Monitors system status. Call your local HV AC service provider . Check F/C (Fahrenheit/Celsius) setting. See Changing Fahrenheit (F) to Celsius[...]
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Page 11
T wo Y ear 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 appl[...]
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Page 12
NOTES 12[...]