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#1
HVAC Help / Re: Trane XV95 fan speed?
Last post by Admin - January 29, 2023, 08:39:38 PM
Are dip switches 7 and 8 ON or OFF on the furnace control board?  Maybe the fan speeds are set too low.  Turning them both OFF would engage the high speed fan for both 1st and 2nd stage heating.

180F seems like a valid limit trip although a furnace without ductwork should not overheat.  I would check the gas manifold pressure or clock the gas meter to see if the furnace is over fired.

A simple fix for a temporary situation would be to remove the jumper between WI and W2 on the furnace control board.  The thermostat should be wired to R and W1.  This will force the furnace to stay is low fire and not overheat in high fire.  Maybe it won't trip the limit in low fire only.  Wiring G to a thermostat with fan control would engage the continuous fan speed and give you less CFM but would only run when the furnace is not heating.
#2
HVAC Help / Trane XV95 fan speed?
Last post by tumbleweed - January 29, 2023, 02:29:09 PM
We have acquired a used Trane XV95. No info as to why it was pulled out but it was free so no complaints there. We have built a new farm shop and intend to install in floor heating so this is a temporary installation.
It appears to work normally with this exception. When it switches from stage 1 to stage 2 the fan speed picks up but it will only run for about a minute before the limit switch opens (4 red flashes) and won't restart until both the fan and inducer have shut down.
My first thought was the limit switch must be faulty. The best shot I have to check the temp of the hot air is with a meat thermometer with a long probe. With it sitting just above the heat exchanger it shows right at about 180F. When stage 2 cuts in the fan speed picks up but it only runs for about a minute until the limit switch opens. The usual reason for the limit switch to open is restricted air flow, but that can't be the reason in this case. We have no ducting on either the cold or hot side and the incoming air is only about 10C or less.
A Trane fact sheet covering this model shows a max fan speed of 5000 rpm. Using a digital tach I read just over 700 on stage 2.
I have the thermometer wired as a 2 wire system using R and W. I see both the thermostat and the furnace have G terminals, which provide some sort of fan control. Should these be wired up?
Any ideas? 
#3
HVAC Help / Re: High Efficiency Furnace Ve...
Last post by rkeaner - January 29, 2023, 10:08:04 AM
Thank You for response.  I assumed that was the case but hoped it was not.
#4
HVAC Help / Re: High Efficiency Furnace Ve...
Last post by Admin - January 29, 2023, 04:27:46 AM
The B149.1-20 Gas Code would not allow this in the province of Ontario,

QuoteClause 8.10.12 - A flue gas vent or a vent connector shall not be installed in either a duct or a shaft used for return air, hot air, ventilating air, or combustion air.

If the joist is lined and acting like a return air, you could just buy some duct board and reduce its size and box out the venting, so the venting was outside of the return air cavity.
#5
HVAC Help / High Efficiency Furnace Ventin...
Last post by rkeaner - January 28, 2023, 09:21:35 PM
My exhaust and intake vent pipes are in a terrible position for finishing my basement soffit. They run under my heat and return trunks and then up between floor joists to the outside wall. It looks like I can maintain the the correct slope if I go up and over the heat and cold air return trunks, however, I would have to go between the floor joists through one of the branches off the cold air return for a couple feet. Can I do this?
#6
HVAC Help / Re: Question about mixing heat...
Last post by Admin - January 28, 2023, 07:32:52 PM
With slab on grade using electric baseboard is pretty common where I live.  Unless you frame out the walls to accommodate low wall supply's.  Or maybe consider a boiler to do both how water and infloor heating in the basement section.

Are you getting rebates for installing the heat pump?  It will likely be cheaper to heat with natural gas so that may be a bit of an overkill.  Although they do want to take us of fossil fuel sooner than later.
#7
HVAC Help / Re: Question about mixing heat...
Last post by futfut - January 28, 2023, 04:01:10 PM
Yes, it's a slab on grade. My old house we had the registers in the ceiling. But  I'm going to demolish the house and rebuild on the same foundation.
#8
HVAC Help / Re: Question about mixing heat...
Last post by Admin - January 28, 2023, 02:13:41 PM
Electric baseboards are sometimes required when ductwork is not possible. 

Is this a slab on grade?
#9
HVAC Help / Question about mixing heat pum...
Last post by futfut - January 28, 2023, 12:29:12 PM
Hello guys, I'm rebuilding my house after a fire. I asked the contractor to install a central system heatpump combined with a natural gas furnace but he also want to add electric baseboards in the basements.
I don't like the idea because eletric board are less efficents than the heatpump and they take space.
But i guess it's cheaper for him?
What do you guys think?

thank you.
#10
Job Postings / HVAC Professionals in Sales - ...
Last post by BluonianRecruiter - January 27, 2023, 06:18:49 PM
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