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INTRODUCING THE NEW TRANE
XL16I (2) STAGE COOLING AIR CONDITIONING/HEAT PUMP!
click here to read about
this exciting new technology! Introducing the Trane XL16i Air Conditioning System!
EDUCATIONAL INFORMATION ABOUT TRANE 92%
FURNACES.
Due to client interest in how these high efficiency
condensing furnaces operate we will attempt to clear up some mis information
that circulates by word of mouth as well as on Internet Chat Forums.
First let us say we have been installing Trane
furnaces since 1989 with next to NO repair problems. This includes the 92%
versions. We ran a new house HVAC business for 10 years installing not only the
furnace, air conditioner or heat pump but all the ductwork, wiring, in other
words a complete turn key installation. We did this on between 150 - 200 new
homes a year for this 10 year period.
To give you all some insight to why some
companies try to discourage you from installing 92% furnaces please read on.
WHY WOULD OTHER COMPANIES NOT WANT TO INSTALL
A 92% FURNACE?
Installing these furnaces MUST be done correctly
or they WILL NOT work right. Companies who hire inexperienced installers and
service people already know they will have problems with the installation. YOU
GET WHAT YOU PAID FOR.
If your basement ceiling is finished with sheet
rock it may be difficult to run the P.V.C. flue pipe or pipes to the outside
wall of the building. These pipes USUALLY have to run horizontally AND have to
have a 1/4" pitch back towards the furnace. If you don't
have this pitch you will get at the LEAST erratic operation of the burners on
the furnace.
The size of the flue pipes ( diameter ) runs
between 2" and 3". The size of the furnace and the length of the runs
of pipe as well as the number of elbows will dictate which diameter of pipe is
needed. Here again, if the installer AND the estimator doesn't understand this,
you can count on problems! In other words if 3" pipe will be needed SOMEONE
has to be sure there is enough clearance to allow for installation AND the
1/4" pitch.
WHAT ARE THE GENERAL REQUIREMENTS FOR
INSTALLING ONE OF THESE FURNACES?
The P.V.C. flue pipes must not be closer to an
opening door or window than 1 foot.
Trane recommends they not be closer than 1 foot
from grade level outdoors. Inspectors will read this in the Trane instructions,
put their tape measure on the pipes to the ground and if it is 11" will
flunk the installation. This is because they know nothing about how the system
operates and are going strictly by the Trane instructions. Here is what is going
on here. Let's say it snows and the pipes get blocked. Inside the single stage
heating furnace there is a pressure switch, if it is a 2 stage heating furnace
there is 2 pressure switches, either way the pressure switch will " sense
" there is an obstruction and after 3 tries of lighting the furnace will go
into lockout. After 1 hour the furnace will again try to relight. If the snow
hasn't yet melted or otherwise been removed, it will again go into lockout mode.
This is strictly for safety! Ice build up during certain humidity and outdoor
temperatures can also cause this problem. The answer is simply to go out and
remove the obstruction.
Other requirements are to keep the flue
terminations away from high wind areas, in alcove areas of the home and a few
other things. These aren't requirements but rather recommendations.
WHY DO I NEED TO CHANGE THE THERMOSTAT AND
THERMOSTAT WIRING TO THE FURNACE?
Another thing that we hear from clients getting
estimates from other companies on 2 stage heating furnaces is that " We
don't have to change your existing thermostat or change the thermostat wire from
the thermostat back to the furnace". This is true if you presently have no
air conditioning ( assuming you will never add air conditioning ) AND also have
(5) wires going to the furnace. We feel however, it is more responsible on our
part to run enough wires so that you won't have a problem adding air
conditioning in the future! The 2 stage furnaces
have a low fire and high fire gas valve which requires a thermostat with low and
high fire capability along with 6 wires going back to the furnace ( with air
conditioning ). Your existing thermostat will have only (1) terminal for heating
designated as " W ". The terminals
are designated W1 ( low fire )and W2 ( high fire ). If the thermostat and wire
isn't changed, the only way an installer can get heat is to " jumper "
low and high out, therefore you end up with a SINGLE STAGE FURNACE RUNNING ON
HIGH FIRE. If you paid for a 2 stage heat furnace you will probably be pretty
upset! Again, YOU GET WHAT YOU PAID FOR. If the price sounds too good, it
probably is. Ask you questions, since if you are talking to a salesman or an
otherwise inexperienced installer they may HONESTLY not understand, or the
company is trying to get away with something? We have been beaten out of jobs by
companies playing this game since they save on the labor, the wire and the cost
of the thermostat.
HOW WILL YOU GET A NEW 6 WIRE THERMOSTAT WIRE
PULLED TO THE FURNACE?
This is where it gets time consuming or even
impossible! We will try to remove your existing thermostat and tie our new wire
on to your existing wire. One person pulls the wire from the furnace area while
another person feeds the new wire by the thermostat. More often than not
however, the wire will be stapled to a stud behind the sheet rock or the wire is
jammed somewhere and can't be pulled. When this happens we may have to re
locate the thermostat and will need some input from the client. If it can't be
relocated you may NOT be able to use a 2 stage furnace effectively. EFFECTIVELY
is the key word. Beware!!
I HAVE HEARD I NEED A FLUE LINER INSTALLED?
When installing a 92% furnace in place of an old
furnace we are removing many B.T.U.'s from the existing double wall vent pipe
which runs through the home to the roof. If you have an old home with a masonry
chimney, this will require a liner for sure! Usually the only gas appliance left, is the
water heater which may not produce enough heat to properly vent. We will test
the drafting of the water heater when finished with the installation, if it has
affected the draft of the water heater you may need a liner installed in your
existing vent to DECREASE it's size to get the water heater drafting right
again. This seldom happens, however some City Inspectors will require it be done.
This liner is stainless steel and is expensive!
BELOW IS AN EXCERPT FROM THE ACTUAL TRANE
INSTALLER'S GUIDE AS TO VENTING WITH P.V.C. PIPE.
TO SEE A WIRING DIAGRAM FOR A 2 STAGE HEATING FURNACE WITH
AIR CONDITIONING CLICK THE LINK BELOW. YOU WILL HAVE TO SCROLL A BIT SINCE WE
HAD TO ENLARGE THE DIAGRAM FOR VIEWING PURPOSES. WHEN DONE CLICK ON THE RETURN
BUTTON TO GET BACK TO THIS PAGE. NOTICE THE THERMOSTAT HAS W1 AND W2
TERMINALS. THIS IS WHAT TELLS THE FURNACE TO SWITCH FROM LOW FIRE TO HIGH FIRE!
THERE IS ABOUT 1 1/2 DEGREES OF DIFFERENCE BETWEEN LOW AND HIGH FIRE. COUNT THE
WIRES NEEDED YOURSELF!
2 Stage Wiring
Diagram
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