Robertshaw 8425 User Manual Page 1

DIGITAL NON-PROGRAMMABLE THERMOSTAT8425ELECTRICEGASGOILO®NeW2 Heat / 2 Cool User's ManualQuick StartInstallationHEAT PUMPHApplicationThe Robertsh

108. Wait five seconds or press and the display will switch to the fil-ter monitor setting.9. CHECK FILTER and the length of hours forthe filter moni

Step 5: TroubleshootingSymptom Remedy Thermostat does not turn on system.Check wiring (see Installationsection). If problems with thermostat cannot be

Two Year Limited WarrantyInvensys Controls Americas warrants to the original contractorinstaller, or to the original consumer user, each new Robertsha

WARNING:• Always turn off power at main fuse or circuit breaker panel beforeinstalling, removing, cleaning, or servicing thermostat.• Read all the inf

WARNING:In heat pump applications, do not connect anything to the W1terminal. When switched to HP mode, W1 is connected internallyto Y1 on the thermo

4. Remove the cover using a coin or screwdriver (Figure 3). Set aside.5. Place thermostat against the wall at desired location. Make surewires will fe

5HotHeatingControlCoolingControlTransformerTHERMOSTATW1CRY1GOB24 VAC120 VACHEAT/COOL4-WIRESINGLE TRANSFORMERFanControlY2W2/EHotHeatingControlTransform

6HotCompressorContactorTransformer24 VAC120 VACHEAT PUMP WITHCOOL ACTIVEREVERSING VALVEW1Y1BGOTHERMOSTATNOTE: Make sure the HP swtich is in the HP p

15. Set the Electric/Gas switch to either GAS for a gas/oil heating system or ELEC for an electric heating system (Figure 5).16. Set the HP option swi

8Step 3: Testing the ThermostatWARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILLDAMAGE THE T

Step 4: Customizing the Thermostat♦ SettingsSystemCool: The thermostat controls the cooling.Off: The heating and cooling systems are off.Heat: The the