The FT Series Floor Standing, Combination Boiler
Page 35
5. Connect a manometer to the Manifold Pressure
Port. See Figure E. For dual port manometers,
use the positive pressure side. Check for proper
manifold gas pressure. Refer to Table C on page
34.
6. Establish a call for heat. You may need to
disconnect the outdoor reset if you are making this
gas conversion during warm weather.
800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering)
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com
Document 4290C
The FT Series, Floor-Standing, Gas Conversion Kit
pg 3 of 4
Manifold pressure
Gas Type ‘NG’ Gas Type ‘LP’
2" VENT 3" VENT 2" VENT 3" VENT
FTCF140
MAX Fire
-0.15
"
WC -0.216
"
WC -0.15
"
WC -0.216
"
WC
MIN Fire
0
”
WC 0.002
”
WC 0.1
”
WC 0.079
”
WC
FTCF199
MAX Fire
-0.134
”
WC -0.173
”
WC
MIN Fire
-0.015
”
WC -0.015
”
WC
Figure D
15.
Setup your combustion Analyzer and
place the sensor into the combustion test port.
16.
Per Table B for Max Fire
,
change dip switch 6 to ON and 7 to OFF.
The unit will cycle up to MAX re.
17.
WAIT for your combustion Analyzer to stabilize. This may take up to 3 minutes depending on your combustion
Analyzer. Then check the CO
2
measurement for MAX re. Refer to Table D for acceptable MAX re
combustion readings. At this point, just record the CO
2
readings at MAX Fire. Do NOT attempt to adjust
CO
2
at MAX Fire. ONLY in MIN Fire, so...
18.
Per Table B for MIN Fire
,
change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
19.
WAIT for your combustion Analyzer to stabilize. Then check the CO
2
measurement at MIN re. Refer to
Table D for acceptable MIN re combustion readings.
20.
If CO
2
readings in Max Fire and MIN re are acceptable, then skip ahead to Step 23. If not, then open the
Gas Valve Adjustment Port by removing the cap screw with a 4mm Allen wrench. See Figure E.
21.
Then use the 4 mm Allen wrench to make a minor adjustment (1/8 turn) to either increase or decrease CO
2
.
Table B DIP Switch Settings
Photo shows a model
140 using 3" venting
and natural gas.
MBH 140 199
ON OFF
MIN Fire Normal Operation
MAX Fire Normal Operation
NG Natural LP Propane
3” Vent Size
2” Vent Size
ON OFF ON ON
ON OFF OFF ON
OFF ON ON ON
REFERENCE
ONLY.
CO
2
value
Gas Type ‘NG’ Gas Type ‘LP’
2" VENT 3" VENT 2" VENT 3" VENT
FTCF140
MAX Fire 8.5~10.5% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
FTCF199
MAX Fire 8.5~10.0% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
Table C
Table D
800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering)
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com
Document 4290C
The FT Series, Floor-Standing, Gas Conversion Kit
pg 4 of 4
Figure F (Conversion label)
This unit was converted on ____/____/___to _____gas
with kit #____________by______________________
(name and company __________________________
accountable)_________________________________
___________________________________________
Cette unité a été converti ____/____/____ten ______gaz
en utilisant le kit numéro _____ par______________
(nom et société_________________________________
responsable)___________________________________
_____________________________________________
H2373900C
Manifold
Pressure Port
Gas Valve
Adjustment Port
(under the cap
screw)
Figure E
22.
It may be necessary to go back and forth between HI Fire and LOW Fire several times (and making
adjustments ONLY at LOW Fire), before CO
2
at both are within acceptable levels. Be sure to put the
cap screw back onto the gas valve adjustment port when done.
23.
Once the CO
2
and manifold pressure measurements for both MIN and MAX Fire are acceptable per
Table D, set DIP switches 6 and 7 to the OFF position for Nominal Fire (normal operation). The FT is
now operating in it’s normal mode.
24.
Write in the correct Conversion Date and the Technicians Name to the included gas conversion sticker.
See Figure F. Then apply that sticker adjacent to the rating plate.
25.
Remove your combustion Analyzer from the combustion test port and be sure to thread the test port plug
back into position.
26.
Re-connect outdoor reset if it was disconnected previously in this conversion and put the Front Panel
and Top Access Panel back on. Tighten them into place using the knob and 4 fasteners that you
disassembled in Step 3.
FTCF140
FTCF199
+
-
+
-
7. Setup your combustion analyzer and place the
sensor into the combustion test port.
8. Per Table B (below) for Max Fire, change DIP
switch 6 to ON and 7 to OFF. The unit will cycle
up to MAX re
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