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I hope so. I am installing a Honeywell 24/7 thermostat and…

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I hope so....

I hope so. I am installing a Honeywell 24/7 thermostat and have labeled all my wires. I have a relatively new hvac in the home I recently purchase and have a question of wires. when removing the previous Honeywell thermostat, I found wires R, RC, W, G & C but no Y. the manual instructs to wire up R, RC, G, W and Y but not to use C. my question is will this set up work without a y connection.

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

More of a concern for the thermostat connectivity.

Contractor's Assistant: Do you plan on doing the work yourself?

I am

Contractor's Assistant: Anything else we should know to help you best?

I don't think so

Submitted: 2 months ago.Category: HVAC
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Answered in 3 minutes by:
5/27/2018
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,151
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified

Hello,

Can you tell us if the home has gas furnace with ac, heat pump etc?

Also disregard computer generated phone offers as that option is not currently available.

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Customer reply replied 2 months ago
gas with ac
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

Thank you,

so for wires you have available:

red

white

green

blue?

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Customer reply replied 2 months ago
red- RC, green-G, white-W, yellow- R, blue- C which instructions say to wrap off the bare wire and not use
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

the blue (in the absence of yellow) becomes Y terminal. But it should not have been on C.

If all you have is red, white, green, blue..

You would have red to rc/rh

white to w

green to g

blue to y

Very simply if no wire was on Y terminal there would be NO cooling option.

Can you check something at the furnace for me?

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Customer reply replied 2 months ago
that's pecular, since the blue wire was not actual connected inside the wall and i hah ac before. in anycase, at the furnace
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

Ok the basic wires are this

we need one to deliver 24 to thermostat. This red. (rc/rh)

we need one for heat- this white (w)

we need one for blower/fan - this is green (g)

So there are 3 wires just to have heat and fan.

If you can remove the furnace doors I can see right a way what the deal is....but with nothing on Y you could not have had cooling. Take doors off furnace and take a pic and post here and I can tell

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Customer reply replied 2 months ago
i do have a yellow wire that was previously on the R terminal at the thermostat
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

Someone has done something "different" with the wiring at some time then as that does not follow color code for function.

If you can get a pic of the circuit board in furnace I can tell better

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

ok can you tell which of those cables goes to the thermostat?

I am sorry to drag this out but yours is not the standard color code or arrangement..especially if you have had ac without a wire on Y terminal in thermostat

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Customer reply replied 2 months ago
nope... 2 separate floors and wrapped between the floors... smdh... this should have take... 10-15 minutes... I hate previous owners that jury-rig major systems.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

do you have more than one thermostat in the home? Maybe a zoned system?

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Customer reply replied 2 months ago
nope I wish i did but sadly no
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

Ok,

well we know (hopefully what 2 wires are for sure....take the red wire and green wire and touch together and tell me if the fan/blower starts.

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Customer reply replied 2 months ago
will i need to turn on at the circuit breaker first?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

yes...but the wires at thermostat are only 24 v so no danger

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Customer reply replied 2 months ago
ok, 1 minute
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

and...tell me what color wire was on what terminal for all wires including the yellow...and let me know what was loses and not used in old thermostat

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Customer reply replied 2 months ago
blower fan started .Old terminal red- RC terminal, yellow wire to R terminal these two were jumpered,green-G terminal, white-W terminal, blue- C terminal. new terminal had all connections previous connections except C terminal connection
Customer reply replied 2 months ago
Yellow was not connected in old thermostat
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

ok next test

red wire to white wire....tell me what kicks on and runs

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Customer reply replied 2 months ago
nothing
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

are we sure the furnace is gas and not electric?

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Customer reply replied 2 months ago
definitely gas... just as the water heater next to it
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

well....

red to white should bypass the thermostat and do a direct call for heat to furnace.

So the furnace should have started when red to white.

You have a unorthodox situation there.

This will require tracing the wires to the end points, which may be tedious....coming from the outdoor ac should be 2 wires.

These 2 wires should meet up with the thermostat wires.

Maybe if you could post a pic of the entire furnace I may be able to direct without having a service call...

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Customer reply replied 2 months ago
did you receive photo / video
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

no. If photo attach with the attach files link. If video I need a link

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago
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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

I have to go offline for awhile...the best I can tell you is to mimic the wire colors you find attached at other end of thermostat wire at the furnace circuit board.

I will respond as soon as I log back on.

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Customer reply replied 2 months ago
dont think i have the tools for thatok, thank
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

were you able to remove the furnace door?

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Customer reply replied 2 months ago
ok
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 months ago

did you get the doors off the furnace or did you decide to go a different route?

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