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WHEN MY NAVIEN COMBI BOILER GOES TO DOMESTIC USE THE AIR HANDLER DONT SHUT OFF UNTIL IT GOES BACK INTO HEAT MODE DONT KNOW WITCH 2 WIRES TO BRING TO THE NAVIEN WITCH HAS A SPOT NEXT TO TT SAYS A/H

My stat runs to air handler white and green. a/h 2 purples run to tt on combi .not sure what I should change around to make that darn fan go off during hot water use.

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I don't see the above problems being of help because it's not a heat pump or a issue about a fan switch. This is a stat and system wiring issue.
Here's a link to a proper wiring diagram.

https://www.dropbox.com/s/808zsozmkxce7fu/CH_NCB%20AHU%20Wiring.pdf
WHEN MY NAVIEN COMBI BOILER GOES TO DOMESTIC USE T - /uploads/images/when-navien-combi-boiler-goes-domestic-34752482-3-1.jpg

Posted on Dec 08, 2014

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Posted on Jan 02, 2017

shastalaker7
  • 1515 Answers

SOURCE: t stat wiring in air handler

Hi, normally they don' t have 2-toned striped wires in a thermostat cable. They must have used some other 18 gauge wire. If this is a gas fired indoor unit, the wires are Red to R, Yellow to Y, G to to green, and white to W. If its a heat-pump, no gas, you will have Red to R, W to W-1 if you have heat strips for second stage heat, G to fan, green, B is blue for the reversing valve, 0 will not be used on a Ruud. You may need to go to the control panel on the outdoor unit to see how they have wired the condenser, as you never no what colors they have picked to use, what ever suits them. You may have a black or brown for common if used, or for emergency heat. Gas air handlers are much easier to wire at the stat then a heat pump, so you will need to check what they used at the outdoor unit. They didn't use regular stat wire as it does not have stripes on it.Please do this and draw your self a diagram so you will know. Most all heat-pumps wire differently, at the stat depending on the kind, and at the condenser. I hope I have been of help to you on this as it is important to get it right, and it sound as tough you are familar with wiring. Please rate me on this and be kind as I know you will. Please keep me posted on the outcome or if you need more help.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor
PS You may not need any of the striped wires as all wires are not used. You will need to look at the outdoor and indoor control board.

Posted on Jul 17, 2010

  • 27 Answers

SOURCE: Air handler fan runs nonstop in heat mode

is this a new problem? the fan speeds can be adjusted by changing wiring connections. If it is a new problem on an existing system then it could be the t-stat or a problem with the curcuit control board. the switch on the t-stat for FAN is set to auto not ON. if set to on the switch to auto - problem solved.

Posted on Nov 26, 2008

matthew_lipp
  • 42 Answers

SOURCE: I need a wiring diagram for a luxaire air handler ahr36b3xh21a and auxilary hot water coil?

red to R and white to BR

Posted on Oct 08, 2012

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