NTI TFTN User manual

NATURAL GAS TO PROPANE GAS
CONVERSION INSTRUCTIONS
service agency in accordance with the manufacturer’s
instructionsandallapplicablecodesand requirements
of the authority having jurisdiction. If the information
an explosion or production of carbon monoxide
may result causing property damage, personal
responsible for the proper installation of this kit. THE
INSTALLATION IS NOT PROPER AND COMPLETE UNTIL
THE OPERATION OF THE CONVERTED APPLIANCE IS
CHECKED AS SPECIFIED IN THE MANUFACTURER’S
INSTRUCTIONS SUPPLIED WITH THE KIT, WHICH
NECESSITATES THE USE OF A CALIBRATED CO2/O2
AND CO COMBUSTION ANALYZER.
WARNING
Applicable Models:
TFTN
TFTN085, TFTN110, TFTN150, and TFTN199

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Part 0. General Safety Information
NTI boilers are factory set to operate
with Natural Gas. BEFORE OPERATING
WITH PROPANE the boiler must be
converted to Propane using this kit.
Use the procedures outlined in these
instructions to fully complete the
Natural Gas to LP conversion for
models 085, 110, 150, and 199.
Kit Contents:
- Natural to LP Conversion
Instructions nr. 1
- LP Conversion Label nr. 1
- LP-Mixer w. Diaphragm
(Table 1) nr. 1
- Gasket for gas pipe nr. 2
Model Polidoro code
(MIXER data plate) LP diaphragm Ø in (mm)
085 and 110
350_0944_036.4 mm
150
350_0921_03
199 350_0922_036.9 mm
Table 1 –LP Mixer and Gas Diaphragm
Data plate
LP diaphragm
If the kit contents do not match
model (see Table 1), DO NOT
proceed with installing the LP-
Conversion Kit, and DO NOT
operate the boiler - contact NTI for
assistance.

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Part 0. General Safety Information
These instructions CANNOT be used
to convert NTI appliance models not
referenced in these instructions.
Contact NTI for the Natural Gas to
LP conversion kit and instructions
for other models.
Failure to apply these instructions
properly may result in dangerous
explosion leading to property
damage, personal injury or death.
ATTENTION:
LIQUEFIED PETROLEUM (LP)
PROPANE
propane gas is heavier than air;
therefore, it is imperative that
your boiler is not installed in a
pit or similar location that will
permit heavier than air gas to
collect.
Local Codes may require
appliances fueled with LP gas
be provided with an approved
means of removing unburned
gases from the room. Check your
local codes for this requirement.
WARNING

4
Part 1 Propane Conversion Procedure
1. Install LP-Mixer with
LP-Diaphragm
a. Check that the code of the air / gas
mixer and the diameter of the gas
diaphragm are those indicated for the
model of boiler to be converted – see
Table 1.
b. Turn the 120VAC power supply OFF to
the boiler.
c. Turn the gas supply OFF.
d. Remove the front cover from the unit.
LP –Gas diaphragm
Figure 1 –Remove the Silencer
Figure 2 –Remove the Gas Pipe
Figure 3 –Remove the NG-mixer
Figure 4 –Insert the LP-diaphragm
e. Remove the silencer.
f. Unscrew the two nuts and remove the
gas pipe.
g. Remove the three bolts securing the
NG-mixer to the blower and remove
the NG-Mixer.
i. Reassemble the gas pipe to the gas
valve and mixer.
ATTENTION!! Use the new rubber
gaskets provided with the kit.
j. Install the silencer.
NOTICE: 150 NG-mixers are
equipped with an NG Diaphragm
located on the mixer gas line inlet
(see Figure 4 for general diaphragm
location).
NOTICE: Save the NG-mixer (and NG
Diaphragm for 150) in-case
the boiler needs to be converted
back to Natural Gas at a later date.
h. Secure the LP-Mixer (with LP
Diaphragm) to the blower in the same
position as the removed NG-Mixer,
reusing the bolts from the previous
step.
NOTICE: Verify the O-ring seal
between the mixer and blower is
correctly positioned and in good
condition before assembling.

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Part 1 Propane Conversion Procedure
1
2
4
2
1
2. Perform preliminary
adjustment on gas valve
throttle screw 4.
a. 085 and 110: Adjust throttle screw 4
counter-clockwise 0.5 turns.
b. 150 and 199: Adjust throttle screw 4
counter-clockwise 2 turns.
c. Turn the gas supply on and test for
gas leaks in all piping.
d. Perform gas line pressure test and
combustion calibration in accordance
with Parts 2 and 3.
NOTICE: 199 Model ONLY:
Figure 5 –Gas valve
When converted to LP, the 199 model
must have the Max Power (parameter
24.1.1) adjusted from 87% to 89%,
and the Min Power (parameter 24.1.3)
adjusted from 4% to 6%.
Parameters are adjusted from
Tech Menu – Complete Menu.

1 32 4
4
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Part 2. Gas valve and burner setup
2. Gas Line pressure
The boiler gas valve is equipped with
a Line Pressure Test Port; see screw 1,
Figure 5.
Use the following procedure to measure
the gas line pressure to the boiler to
ensure it falls within the range given in
Table 2:
a.
b. Loosen screw 1 (Torx 10 - Line
Pressure Test Port). This port is
directly connected to the gas line
feeding the boiler. See screw 1, Figure
5.
c. Connect a gas pressure gauge to
the line pressure test port using
applicable tubing. Ensure both
ends of the tubing make a tight
connection.
d. Turn the gas supply to the boiler on
and check for gas leaks.
e. Observe the line pressure under static
conditions and compare it to Table 2.
The pressure will be greatest under
static conditions.
1. Operating Sequence
Prior to commencing the Gas Valve and
Burner Setup, perform the following
operating sequence check:
a.
b. Set the thermostat to the highest
setting.
c. Ensure the combustion fan pre-
purges for a short time prior to
activating the igniter.
d. Ensure the combustion fan post-
purges for at least 5 seconds prior to
reactivating the igniter.
e. Set the thermostat to the lowest
setting and continue with the Gas
Valve and Burner Setup procedure
outlined below.
Failure to perform the Gas Valve
and Burner Setup correctly may
result in incorrect operation,
component failure, property
damage, serious injury or death.
Table 2 – Line Pressure Parameters
Line Pressure
(inches w.c.)
Nominal Min. Max.
Natural 7 3.5 10.5
Propane 11 8 13
Failure to close the bleed screw
of the Line Pressure Test Port will
cause a severe leakage of gas,
causing property damage, serious
injury or death.
f. Observe the line pressure with the
boiler running, while checking/
adjusting the CO2 at maximum and
Compare it to Table 2. The pressure will
g. Adjust the gas line pressure to ensure
the parameters in Table 2 are attained
under all conditions.
If possible, adjust the line pressure to
the “Nominal/Desired” value listed in
Table 2 while the unit is operating at the
maximum power.
Continue observing gas line pressure
until completing of necessary Checking/
Adjusting of the CO2(see Part 3), in case
adjustments need to be made.
h. Complete pressure testing. Remove
the tubing from the test port and then
return the bleed screw of the Line
Pressure Test Port to the closed position.
Check for gas leaks.
WARNING
DANGER
Thelinepressureisafunctionofthe
such as line size and regulator
settings. Under no circumstances
or be used to adjust the gas line
pressure.
NOTICE

7
It is very important that the
combustion system be set
within the recommended CO2/
CO measurements listed in
Table 3. Visually looking at the
burner does not determine
combustion quality. Failure to
measure combustion with a
calibrated combustion analyzer
and set the throttle within
the recommended CO2/CO
measurements could result
in property damage, severe
personal injury, or death.
1. Preparing the measuring equipment
Remove the Combustion Test Port plug,
as illustrated (Figure 6), and insert a
calibrated combustion analyzer.
Make sure the analyzer is set to the
appropriate fuel.
It is required to use a calibrated
combustion analyzer to verify
the combustion chart (Table 3).
Failure to do so could result in
serious personal injury or death.
Figure 6 – Combustion Test Port
Adjustments to the Gas valve may
technician, while using a calibrated
combustion analyzer capable of
measuring CO2 and CO. Adjustments
may only be performed if the gas
line pressure is maintained above
minimum levels throughout the
duration of the test. See Table 3.
Failure to follow these instructions
may result in serious injury or death.
FAILURE TO PERFORM THE FLUE
GAS ANALYSIS AND ADJUSTMENT
AS DETAILED IN THIS SECTION
MAY RESULT IN ERRATIC AND
UNRELIABLE BURNER OPERATION,
LEADING TO REDUCED EFFICIENCY,
INCREASED FUEL CONSUMPTION,
REDUCED COMPONENT LIFE,
HEAT EXCHANGER COMBUSTION
DEPOSITS, AND GENERAL UNSAFE
OPERATION. FAILURE TO FOLLOW
THESE INSTRUCTIONS MAY RESULT
IN SERIOUS INJURY OR DEATH.
WARNING
WARNING
WARNING
WARNING
NOTICE
Part 3. Checking/Adjusting the CO2 at Max and Min Power

8
Wait 1 minute for the boiler to stabilize
before carrying out the combustion
analyses. Read the CO2value (%) and
compare it with the values given in the
table below:
Gas
CO2(%) CO
(ppm)
NG 8.7–10.0 <175
LP 9.7–11.0 <175
Table 3 – CO2Max – Min
ATTENTION:
The CO2 at Min Power must be set lower
than the CO2at Max Power by 0.2 – 1.0%
( e .g. if, using LP, the CO2 at Max Power = 10.3%,
the CO2 at Min Power must be between 9.5 – 10.1% ).
ATTENTION!! Values must be obtained
with the front cover installed.
If the CO2
values given in Table 3, adjust the gas
valve following the instructions below.
Otherwise move directly to the next
operation.
ATTENTION!!
Test Function will automatically deactivate
after 30 minutes. Test Function can be
RESET
button.
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24
Adjusting the Gas Valve at Max Power
Adjust the gas valve by turning setting
screw 4clockwise to increase the
CO2 level; counterclockwise to reduce
the CO2 level (1 turn adjusts the CO2 level
by approximately 0.3%). Wait 1 minute
after each change in setting for the CO2
value to stabilize.
If the measured
value corresponds
Figure 7 – Max Power
CO2 Adjustment
Wait 1 minute for the boiler to stabilize
before carrying out the combustion analyses.
2. Checking/Adjusting the CO2at Max Power
Set the thermostat at the highest possible
setting to create a demand for heat.
Select Max Power from the Test Mode
– Burner Test screen, then wait for the
Burner Power gauge to reach 100%.
3. Checking/Adjusting the CO2at Min Power
Select Min Power from the Test Mode –
Burner Test screen, then waitfor the Burner
Power gauge to reach 10%.
4
to the value given
in Table 3, Max
Power adjustment
is complete.
Otherwise, continue
with the procedure.
Part 3. Checking/Adjusting the CO2 at Max and Min Power
Max Power
(100%)
Min Power
(10%)
8.5–9.8
9.5–10.8

4
9
Carbon Monoxide - Never
leave the unit operating while
producing Carbon Monoxide (CO)
concentrations in excess of the
values indicated in Table 3. Failure
to follow this warning may result in
serious injury or death.
Table 4 Gas Input at Min and Max Power
Model Min Power Max Power
B u r n e r Power MBH MBH
TFTN085 8.5 85
TFTN110 11.0 110
TFTN150 15.0 150
TFTN199 19.9 199
1. Canada: Altitudes between 2000-4500 ft, de-rate by 10%. Consult local authorities
for de-rating for altitudes above 4500ft.
2. USA: De-rate capacity by 4% for every 1000 ft above sea level, if altitude is above
2000 ft.
the CO2level; clockwise
increase it.
Wait 1 minute
after each
adjustment for
the CO2 value
to stabilize.
WARNING! Min Power adjustment
is very sensitive.
If the value measured corresponds to
the value given in Table 3, Min Power
adjustment is complete. Otherwise
continue with the procedure.
Attention!!
If Screw 2 has been adjusted, it is
necessary to repeat the 'Ajusting
the CO2 at Max Power' procedure.
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2
Adjusting the Gas Valve at Min Power
Remove cap and adjust screw 2by
turning counter-clockwise to reduce
Figure 8 - Min Power
CO2 Adjustment
4. Ending Adjustment
1. Exit Test Mode by pressing the 'Press to
Stop Test' button (located in the lower-
left corner of the Burner Test screen).
2. Turn down the thermostat and / or stop
the DHW draw.
3. Reinstall the Combustion Test Port plug
(see Figure 6).
4. Check for and repair any gas leaks.
5. Reinstall the front cover.
If the CO2 (%) reading at Min Power is
not 0.2 – 1.0% lower than the CO2(%)
reading at Max Power, adjust the gas
valve following the instructions below.
Otherwise move directly to the next
operation.
WARNING
10 %
B u r n e r Power
100 %
2
Part 3. Checking/Adjusting the CO2 at Max and Min Power

10
5. Update rating plate
Gas to LP Conversion Kit, you must
indicate on the boiler that it has been
converted for use with Propane (LP) Gas:
a. Update Rating Plate Decal – Locate
the rating plate decal on the side of
the appliance. Using a regular ink pen,
check the box next to “Field converted
Press hard enough to permanently
mark the decal. See Figure 9.
FACTORY SET FOR NATURAL GAS
Field converted to Propane Gas
ADJUSTER A L’USINE POUR GAZ NATURAL
Convertie au propane sur place
Date: Date:
Gas Pressure [Pression du Gaz]
Maximum Inlet Gas Pressure [Pression maximale d’entrée du gaz]
Minimum Inlet Gas Pressure [Pression minimum d’entrée du gaz]
Manifold Pressure [Pression d’admission]
Natural [Naturel] Propane
10.5" wc [2.6 kPa]
3,5" wc [1 kPa]
0" wc [0 kPa] 0" wc [0 kPa]
8" wc [2 kPa]
13" wc [3.2 kPa]
October 22,2018
b. Conversion Decal - Fill out the
required information on the
Conversion Decal (included in this
adjacent to the rating plate decal, in
a location where it can be easily seen.
See Figure 10.
Figure 9 - Update the Rating Plate Decal
Figure 10 - Conversion Decal
THIS CONTROL WAS CONVERTED FOR USE WITH PROPANE GAS
This appliance has been converted for use with Propane Gas, in accordance with the
instructions provided with the Natural to Propane Conversion Kit
by ______________________________________ , which accepts responsibility that
the conversion was performed properly.
Reference rating plate for Propane Input and Gas Pressure
420060882600
John Smith
Part 3. Checking/Adjusting the CO2 at Max and Min Power

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NTI Boilers Inc.
30 Stonegate Drive Saint John,
NB E2H 0A4 Canada
Technical Assistance: 1-800-688-2575
Website: www.ntiboilers.com
Fax: [phone]
Visit us online
86662 Rev. 22.7.13