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Honeywell

Q: will this work with a 750 mV system?

I had this thermostat installed in one of my rental units. It worked great for about 1 year. My renter complained of the heat not coming on at the agreed upon temperature set point (72 degrees F). My renter would increase the set point and the heater would then come on. After investigating the situation, I discovered smoke had contaminated the thermostat contacts. After cleaning the contacts the thermostat would function as designed until smoke contaminated the contacts again. I installed a thermostat having sealed contacts which solved the problem. So, bottom line, yes this thermostat will work on a 750 mv system. However, if this thermostat operates in a contaminated environment be prepared to clean the contacts periodically.

Q: I have 3 wires,This thermostat has only connections for 2 wires.Can I still use it?

This will depend on your situation. If you are just trying to use it for turning on and off a heat source, then it should work just fine. Follow the instructions carefully. Even though you have 3 wires, I'm guessing one of the 3 is not being used. Follow the wire to the other end and see if all 3 wires are hooked up. If there are only 2 hooked up, those same 2 wires will be what you use at the stat. The stat is just like a light switch, just lower voltage. Power will come from your transformer, through the stat, then to the device control you want to turn on. If you have a unique situation and need more help, you can take some pictures and describe your application and send them to me at samoore@parker.com and I will do my best to help you out.

Q: is this a 2 wire connection?

yes 2 wire, but be careful...no off switch even though picture may show one.

Q: Where to set adjustment lever for a lp gas fireplace? i tried 0.4 (factory setting / gas <90% eff) and fireplace had lower flame than before.

this unit only activates a contact that is activating buy the temp that the setting is placed at, it does not control the amount of gas at your fireplace, or how the flame is burning

Product ID: 339086554

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Details

Brand
Honeywell Home
Model name
CT30A1005
Product dimensions
2.2D x 7.9W x
Controller type
Hand Control
Special features
Heat Only

🔥Heat-only precision

⚙️Bimetal sensor tech

🛠️Easy manual control

Frequently Bought Together

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Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat for Single-Stage Systems, White

Description

🔥 Stay warm, stay smart — manual control with modern style!

SLEEK STYLISH - Includes decorative backplate to elevate your space’s look
ECO FRIENDLY DESIGN - Mercury-free for a safer, greener home or office
COMPACT LIGHTWEIGHT - Small footprint fits seamlessly anywhere, no batteries needed
EFFORTLESS CLIMATE CONTROL - Simple manual operation for zero hassle comfort
PRECISION TEMPERATURE SENSING - Reliable bimetal sensor ensures consistent warmth

The Honeywell manual heat-only thermostat offers reliable temperature control with a mercury-free bimetal sensor, packaged in a compact, stylish design complete with a decorative backplate. Perfect for commercial or residential use, it requires no batteries and delivers straightforward, worry-free operation.

Specifications

Product Dimensions	7.92 x 2.24 x 7.92 cm; 68.04 g
Item Weight	0.15 Pounds
Specific uses	Commercial/Residential
Number of pieces	1
Batteries required	No
Included components	Thermostat, Decorative Backplate

Have a Question? See What Others Asked

will this work with a 750 mV system?

I have 3 wires,This thermostat has only connections for 2 wires.Can I still use it?

is this a 2 wire connection?

Where to set adjustment lever for a lp gas fireplace? i tried 0.4 (factory setting / gas <90% eff) and fireplace had lower flame than before.

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