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Question posted by drwho304 on October 21st, 2014

Constant Power To One Of My Taco Zone Valves.

I have constant power to my one of my Taco zone valves, it is always at 24-25 volts. I can not shut it off, any suggestions. I have all Honeywell RTH5100B thermostats, others seem fine.

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Related Honeywell RTH5100B Manual Pages

Owner's Manual - Page 1

Registered Trademark © 2004 Honeywell International Inc. RTH5100B Non-programmable Thermostat INSTALLATION INSTRUCTIONS The RTH5100B Thermostat provides electronic control of 24 Vac singlestage heating and cooling systems or 750 mV heating systems. START HERE For assistance with your Honeywell product, please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll free at ...

Owner's Manual - Page 2

Contents Prepare for Installation 3 Follow Important Instructions 5 Remove Old Thermostat 6 Follow Special Instructions 7 Label Old Thermostat Wires 10 Mount New Wallplate to Wall 11 Connect Wires to New Wallplate 15 Install Batteries 20 Attach New Thermostat to Wallplate 21 Configure Installer Setup 22 Customer Assistance 28 Limited One-Year Warranty 29 69-1716 2

Owner's Manual - Page 3

... included: Inside SetCtinogol Fan Auto SysteCmoolOn Cool PRESS WALLPLATE THERMOSTAT MOUNTING SCREWS (2) AND WALL ANCHORS (2) OPERATING INSTRUCTIONS INSTALLATION INSTRUCTIONS WIRE LABELS OPERATING INSTRUCTIONS CAUTION CARD INSTA ATION CAUTION les X2 Y www M22033 If any of the items shown above are missing, call Honeywell Customer Care at 1-800-468-1502 before returning the...

Owner's Manual - Page 5

... Installation Instructions explain later how to use the enclosed wire labels to correctly mark the wires connected to the heating and/or cooling system. OLD THERMOSTAT YELLOW WHITE Y W RED G GREEN RC R ORANGE ! Do not connect the wires to the new thermostat based on wire color because damage can occur to your old...

Owner's Manual - Page 6

...Turn off power at the heating and/or cooling system or fuse/circuit breaker panel. 2. Remove the cover from the wall or wallplate. Remove the old thermostat from the old thermostat. 3. Contact your old thermostat in a sealed tube. 69-1716 6 Remove Old Thermostat 1. Do not remove the wires. Step 3. Y G C OLD THERMOSTAT WALLPLATE W THERMOSTAT R COVER .2.18 .9 .7 .5 L O .25...

Owner's Manual - Page 7

... 4. Make sure they do not connect them to your old thermostat, do not touch each C and/or C1 wire(s) with electrical tape. Disconnect the C and/or C1 wire(s). OLD THERMOSTAT Y G C W R LETTER DESIGNATION SCREW TERMINAL WIRE WIRE HOLE DO NOT CONNECT TO NEW THERMOSTAT M22037 7 69-1716 If you have C and/or C1 wire...

Owner's Manual - Page 8

... to five wires connected to the old thermostat. OLD THERMOSTAT Y1 G W2 Y2 W1 R LETTER DESIGNATION SCREW TERMINAL WIRE WIRE HOLE SIX WIRES CONNECTED M22038 69-1716 8 Visit www.honeywell.com/yourhome or call Honeywell Customer Care at 1-800-468-1502 before returning the thermostat to your old thermostat (not counting the C or C1 wires), do...

Owner's Manual - Page 9

... not connected to your old thermostat, do not connect them to your new thermostat. 6. Wrap the end of the wires that are not connected with electrical tape. Label and Disconnect Wires from Old Thermostat 9 69-1716 Follow Special Instructions (Cont) 5. DO NOT CONNECT TO NEW THERMOSTAT M22040 Step 5. OLD THERMOSTAT Y G RC W R LETTER DESIGNATION SCREW TERMINAL...

Owner's Manual - Page 10

... WIRE LABEL LETTER DESIGNATION SCREW TERMINAL WIRE WIRE HOLE M22039 When connecting the wires to the new thermostat, refer to fall into the wall opening after the wires are disconnected. 2. Step 5. Do... each wire, use the enclosed wire labels to your new thermostat based on the color of the old thermostat from the wall. As you disconnect each wire that matches the letter designation....

Owner's Manual - Page 11

THERMOSTAT WALLPLATE WIRE HOLE M22042 11 69-1716 Separate the wallplate from the thermostat as shown. Mount New Wallplate to Wall 1. Step 6.

Owner's Manual - Page 17

... 69-1716 Be sure to New Wallplate (Cont) 6. These numbered notes appear on your old and new thermostats. Connect Wires to read the notes referenced in the numbered triangles above. New Possible letter designations Thermostat on the labeled wires 1 RC 2 RC or R 2 1 R or RH, 4, V R Y or Y1, M Y NOT USED O/B W 3 W or W1, H, O, B G or F G Do...

Owner's Manual - Page 18

...not use . Wrap the bare end of the terminals, RC or R, will be connected on the new thermostat. 2 If wires were connected to both O and B when wiring to the new R. 3 Do not connect both R... and RH terminals on the new thermostat. Step 7. Leave metal jumper in place if only one of the wire with electrical tape and do not use...

Owner's Manual - Page 20

... the batteries. Install two fresh AAA alkaline batteries on the back of the thermostat as marked on the removable battery holder. 20 BACK OF THERMOSTAT BATTERY HOLDER BATTERIES M22056 69-1716 After the thermostat is mounted on the wallplate, the thermostat does not require removal from the wallplate to the enclosed Operating Instructions (69...

Owner's Manual - Page 21

... wall opening. 21 69-1716 WALLPLATE TABS RC R Y NOT USED O/B W G TABS SLOTS ON BACK OF THERMOSTAT M22057 2. Attach New Thermostat to the wallplate, push the excess wire back into place. 3. Align the four tabs on the power at the heating and/or cooling system or fuse/circuit breaker panel. Step 9. Turn on the...

Owner's Manual - Page 22

Use the Installer Setup Menu to match your new thermostat to set up your thermostat. 2. Replace Batt Service Needed Cool On Fan System Auto Cool M22058 3. Release the buttons... until the screen changes. Step 10. Follow the steps in this section to your thermostat matches the display below. Replace Batt Service Needed Done Next 69-1716 M22121 22 Configure Installer Setup 1.

Owner's Manual - Page 23

... select your setting, press the Next button to go to the next Installer Setup Number. 10. After you could turn the fan on your old thermostat.) M22122 23 69-1716

Owner's Manual - Page 24

... select your display, go the next Installer Setup Number. Configure Installer Setup (Cont) 6. M22060 24 INSTALLER SETUP NUMBER SETTING Replace Batt Service Needed Done Next UP BUTTON DOWN BUTTON NEXT BUTTON 2 69-1716 Heat Pump Changeover Valve Use this setting if you connected a wire labeled O to go to the next page. 7. After...

Owner's Manual - Page 25

... UP BUTTON DOWN BUTTON NEXT BUTTON 3 Fan Heating system Control in controls fan in table below. 11. If you select your setting for heat. M22061 25 69-1716 Configure Installer Setup (Cont) 9. Step 10. If you do not have a number 3 on the left side of your display, go to the next...

Owner's Manual - Page 27

...save your setting for information on how to select your settings. 17. The installation of the thermostat is complete. Configure Installer Setup (Cont) 15. INSTALLER SETUP NUMBER SETTING DONE BUTTON Done ... 27 69-1716 Press the Up or Down button to operate your new thermostat. Congratulations! Step 10. Refer to the enclosed Operating Instructions (69-1722) for Installer Setup Number ...

Owner's Manual - Page 28

MODEL NUMBER xxxxxxxx DATE CODE xxxxxx THERMOSTAT BATTERY HOLDER 69-1716 M22178 28 Before calling, please have the thermostat model number and date code available. Customer Assistance For assistance with your Honeywell product please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll free at 1-800-468-1502.