Re: How do i remove the cover of my honeywell st699...
Switch of the power; use a small screwdrive to press down carefully into the three small slots (two at the top, one at bottom left) to release the plastic clips while easing the front panel towards you.
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While it appears the ST699 is a timer that connects to a thermostat.
So yes, they both control 230Volt boiler-and-pump. But there are differences. Google search each item and include .pdf in search parameter to find product manual for each, and then compare wiring differences.
Disregard wire colors. Instead wire by terminal designation. In other words : Wire on "R" Terminal on old thermostat to "R" Terminal on new thermostat no matter the color.
HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.
If you go to your local home depot, and get a new thermostat, it will come with different diagrams for wiring in the instructions that are pretty easy to understand. I hope this helps.
with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve
yep the wires will hook up to the same designations, just write down what color was connected where. You will need to set the thermostat up for your particular situation...gas, electric, heat pump, ect. The installation maunel is very clear on this aspect so you should not have a problem.
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