Instruction/ maintenance manual of the product 9420 Robertshaw
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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.
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.
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.
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.
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.
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.
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.
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.
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.
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 .
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.
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An important point after buying a device Robertshaw 9420 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Robertshaw 9420 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Robertshaw 9420 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Robertshaw 9420 you will learn all the available features of the product, as well as information on its operation. The information that you get Robertshaw 9420 will certainly help you make a decision on the purchase.
If you already are a holder of Robertshaw 9420, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Robertshaw 9420.
However, one of the most important roles played by the user manual is to help in solving problems with Robertshaw 9420. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Robertshaw 9420 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center