Laars FT Series Installation And Operation Instructions Manual page 41

The FT Series Heating Only, Boiler
The FT Series, Heating Only, Gas Conversion Kit
MFTHW 80/100
All sizes
120/140/175/199
(and all altitudes)
Table D
Refer to the below table.
14.
Setup your combustion analyzer and place the sensor into the combustion test port
15.
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.
16.
Manifold pressure
WAIT for your combustion analyzer to stabilize. This may take up to 3 minutes depending on your
combustion analyzer. Then measure the CO 2 for MAX fi re. Refer to Table D for acceptable MAX fi re
combustion readings Do NOT adjust CO2 at MAX Fire. ONLY in MIN Fire, so...
MFTHW 100
17.
Per Table B for MIN Fire , change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
18.
WAIT for your combustion analyzer to stabilize. Then measure the CO 2 for MIN fi re. Refer to Table D for
MFTHW 140
acceptable MIN fi re combustion readings
19.
Open the Gas Valve Adjustment Port by removing the cap screw with a T15 Star/Torx screwdriver.
20.
Then use the T15 Star/Torx to make a minor adjustment (1/8 turn) to either increase or decrease CO 2 . MFTHW 175
21.
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
MFTHW 199
adjustment port cap screw back onto the valve when done.
22.
Once the CO 2 and manifold pressure measurements for both MIN and MAX Fire are acceptable, set DIP
switches 6 and 7 to the OFF position for Nominal Fire (normal operation).
23.
Write in the correct conversion date and the technicians name to the included gas conversion sticker. See
Figure E. Then apply that sticker adjacent to the rating plate.
24.
Put the boiler cover back on and assemble/tighten the 4 screws that hold the cover in place.
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 _____
(nom et société_________________________________
responsable)___________________________________
_____________________________________________
CO value
2
par______________
800.900.9276 • Fax 800.559.1583
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
Propane Gas (LP)
2˝ VENT 3˝ VENT
9.5~11%
9~10.5 %
Propane Gas (LP)
-0.075˝ WC
-0.003˝ WC
-0.130˝ WC
-0.004˝ WC
-0.169 ˝ WC
-0.015˝ WC
-0.169˝ WC
-0.015˝ WC
Figure E (Conversion label)
(Customer Service, Service Advisors)
Page 41
Document 4387
Natural Gas (NG)
2˝ VENT 3˝ VENT
8.5~10.5%
8~10%
Natural Gas (NG)
-0.070˝ WC
-0.000˝ WC
-0.100˝ WC
-0.002˝ WC
-0.129˝ WC
-0.015˝ WC
-0.129˝ WC
-0.015˝ WC
(Applications Engineering)
pg 4 of 4