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Round Non-Programmable, Heat Only, Digital Thermostat
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MANUALS (3)
Product Highlights
Description
Features:
- Attractive styling complements any decor
- One-touch backlit display
- Familiar twist-to-see operation. Available in Heat/Cool and Heat Only models
- Includes: Wallplate, resistor assembly, mounting screws and wall anchors
Specs
| Amperage: | 6 |
|---|---|
| Application: | Heat Only |
| Stages: | 1 Heat |
| Programmability: | Non-Programmable |
| User Interface: | Mechanical |
| Mount: | Round |
| Power Method: | System Heating Controls |
| Changeover: | Manual |
| Temperature Range (F): | 40°F - 90°F |
| Max Temp Differential: | 1°F |
| Operating Humidity: | 5 to 90% RH, non-condensing |
| Voltage: | Low voltage 24V |
| Wattage: | 0.4 to 180 |
| Wiring: | W R |
| Frequency: | 60 Hz |
| Color: | Premier White |
| Height: | 3-11/16" |
| Width: | 3-11/16" |
| Depth (Inches): | 1-7/16" |
Questions?
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Most Liked Positive Review
Purchased Five Thermostats
Most Liked Negative Review
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DO NOT USE WITH TACO ZONE VALVES
Love these t-stats
would buy again
Simple, "Bread & Butter" Thermostat
I would buy this again
First time customer and I'll be back.
Impressed
I would buy this product again.
Excellent replacement for old mercury switch thermostat
Bought 4, all work great
Great, simple digital display
Product Q&A
12 QuestionsQ: will this work with an 18 volt ,210A system ?
Asked by Chris 8 years ago
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Verified Reply- MarissaUnfortunately this is only compatible with a 24v unit so it would not be compatible.
Q: round programmable Honeywell. Do you just turn to change and set thermostat, or do you have to push it from the side??
Asked by Dave 10 years ago
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Verified Reply- Supplyhouse StaffYes the outer ring spins to set the temperature.
Q: Dear Sirs, I am looking for Heat Only, Digital Thermostat SKU:T8775A1017(1 )0620 , it is the same as T877A1009? Brand: Honeywell thanks! Hong
Asked by Hong 11 years ago
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Verified Reply- Supplyhouse StaffI can't find any specs on your T8775A1017 to match a replacement to.
Q: I have zoned in-floor radiant heat with Comfort-Trol zone valves and I am replacing the old Honeywell round mercury thermostats with these. They seem to intermittently power on and off. Do I need to install the Resistor and Transorb assemblies as is called out for Taco zone valves?
Asked by JP 11 years ago
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Verified Reply- Supplyhouse Staffwe don't have tech info like that, it would be best to contact Taco or Honeywell to trouble shoot.
Q: I'd like to replace two of my Honeywell T87F which I think is the problem because 3 of them heats their particular zones (I have a total of 5 around the house). Will this thermostat work mixing two kinds of thermostat? I only have heat no AC.
Asked by Lyons 11 years ago
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Verified Reply- Supplyhouse Staffif they are all 24volt then yes. thermostats can be mixed w no issue.
Q: will this work with a gas multivolt fireplace insert
Asked by Ken 12 years ago
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This stat is a power stealing unit and requires a 24V transformer to operate so will not work on millivolt systems a good alternative is a pro5000 Honeywell it will require you to use the battery feature but they are good accurate stats.. hope this helps..Dave
Q: re: Honeywell t8775a1009 (1)0636 Thermostats. After a new boiler install, the thermostat will not turn on (no digital reading). There is current flowing to wires attached to base plate. If I take the thermostat and hook it up to another base plate in my house, the thermostat works (lights up, reads temp, and sets room temp). HVAC contractor that installed boiler insists I need a new thermostat.
Asked by Zee 13 years ago
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check sub base holes where stat makes the connection. maybe something is preventing a connection. I believe you could clean it out with a paper clip. (with power off)
If you take the thermostat of the wall and jumper the two wires together does the boiler come on? If it doesn't then some thing isn't wired properly. If it does then you may need to add the resistor that came with the thermostat as per instructions. If this doesn't fix it then you either need to add a isolation relay or change models of thermostats. I would suggest a more knowledgeable contractor also. He should of been able to give you or do theses things for you.
Q: We have this unit and last night the temperature jumped up to 71 degrees. We had this thermostat set at 66 degrees. I checked to make sure it was still set at 66 degrees and it was, but the room temperature was at 71 degrees. The temperature has not decreased since last night even though it is set at 66 degrees. I also notice the "flame" indicator is not displaying. Somehow our electric boiler is working and pumping water through the house to keep it at 71 degrees. Any ideas???
Asked by 14 years ago
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Verified Reply- PexSupply StaffYou can disconnect the thermostat to see if the boiler is still running. If the unit is not running, you likely have a defective/broken thermostat. If the unit is still running then you probably have an issue with the boiler control.
first you got to no if you got zone.is the zone valve stuck open to many question to ask you
I don't have the answer for you, but I had a similiar problem. Set temp. at 70 deg., room temp. display rose to 88 deg. The thermostat continuously called for heat even though the "flame" heat-on icon was not displayed. I called Honeywell's toll free number and was told that a professional installer would have to come and verify that the t-stat was defective before I could place a warranty claim. I replaced it with the basic round heat only model CT87 and everything works fine now. This was easier faster and cheaper than hiring a pro to tell me the t-stat was defective.
Q: I currently have a 5 zone hydronic heating system using Automag zone valves and one circulator. All zones are controlled by Honeywell round, mercury thermostats, # T87F 1859 2. They are simply SPDT switches. I'd like to replace them with non-programmable digital thermostats, preferably Honeywell. Any suggestions?
Asked by Bill 15 years ago
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Verified Reply- PexSupply StaffYes, you can use part T8775A1009 to replace your existing thermostats.
Q: Having a problem with this thermostat failing. The thermostat controls older zone valves. I have installed the resitor but continue to have problems.The manual thermostats work fine.
Asked by bud 15 years ago
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Verified Reply- PexSupply StaffWe would recommend that you check the transformer and wiring to make sure they are wired correctly and that the transformer is sized correctly.