Thermostat - Digital Thermostat User Manual

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DIGITAL

NON-PROGRAMMABLE

THERMOSTAT

9420

HEAT PUMP

NeW

2 Heat / 2 Cool

User's Manual

Quick Start

Installation

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 1

stage temperature differential: 0.5°F to 3.0°F

(0.5°C to 1.5°C)

• Adjustable 2

stage temperature differential: 1°F to 6°F

(0.5°C to 3.0°C)

• Adjustable 2

stage delay (10-40 min.)

• Compressor short cycle protection

•Accuracy within ±1°

• 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

• Automatic heating shutdown if temperature exceeds 94°F (34°C)

110-1044B

Summary of content (12 pages)

PAGE 1
9420 DIGITAL NON-PROGRAMMABLE THERMOSTAT H NeW HEAT PUMP 2 Heat / 2 Cool User's Manual Quick Start Installation 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 1st stage temperature differential: 0.5°F to 3.0°F (0.5°C to 1.5°C) • Adjustable 2nd stage temperature differential: 1°F to 6°F (0.5°C to 3.0°C) • Adjustable 2nd stage delay (10-40 min.
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! 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.
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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 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.
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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.
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◆ 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).
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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 cool
PAGE 7
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.
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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.
PAGE 9
◆ 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 temperature 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.
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◆ Reset To reset the thermostat press the RESET button located just below the lower left corner of the display. WIRING OPENING Reset Switch Step 5: Troubleshooting Symptom Remedy Thermostat does not turn on system. Check wiring (see Installation section). Thermostat turns system on and off too frequently. Increase temperature differential (see Changing the Temperature Differential section). Display shows CHECK Monitors system status. Call your local HVAC service provider.
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Two Year Limited Warranty Climate Controls Americas warrants to the original contractor installer, or to the original consumer user, each new Robertshaw thermostat 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.
PAGE 12
NOTES 12