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Page 40
4.13 Natural Gas to Propane Conversion (continued)
The FT Series, Floor-Standing, Gas Conversion Kit
ON
MIN Fire
MAX Fire
NG Natural
3" Vent Size
ON
OFF
ON
OFF
OFF
MBH
Table B DIP Switch Settings
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 fi 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 fi re. Refer to Table D for acceptable MAX fi 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 fi re. Refer to
Table D for acceptable MIN fi re combustion readings.
20.
If CO 2 readings in Max Fire and MIN fi 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 .
Manifold pressure
FTCF140
FTCF199
Table C
CO
FTCF140
FTCF199
Table D
OFF
Normal Operation
Normal Operation
LP Propane
2" Vent Size
ON
ON
OFF
ON
ON
ON
ON
140
199
Gas Type 'NG'
2" VENT
MAX Fire
"
-0.15
"
WC
MIN Fire
0
MAX Fire
MIN Fire
Gas Type 'NG'
value
2
2" VENT
MAX Fire
MIN Fire
MAX Fire
800.900.9276 • Fax 800.559.1583
MIN Fire
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com
Photo shows a model
140 using 3" venting
and natural gas.
3" VENT
2" VENT
"
WC
-0.216
WC
-0.15
"
"
0.002
WC
0.1
"
-0.134
WC
"
-0.015
WC
3" VENT
2" VENT
8.5~10.5%
8~10%
8.5~10.0%
8~10%
(Customer Service, Service Advisors)
Document 4290C
Figure D
Gas Type 'LP'
3" VENT
"
"
WC
-0.216
WC
"
WC
0.079
WC
"
-0.173
WC
"
-0.015
WC
Gas Type 'LP'
3" VENT
9.5~11 %
9~10.5 %
9.5~11 %
9~10.5 %
(Applications Engineering)
pg 3 of 4
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