Laars FT Series Installation And Operation Instructions Manual page 40

Page 40
The FT Series, Heating Only, Gas Conversion Kit
4.13 Natural Gas to Propane Conversion (continued)
ON
MIN Fire
MAX Fire
NG Natural
3" Vent Size
MBH 100
These 3 bottom switches must be set per unit SIZE.
Table B DIP Switch Settings
9.
Per Table B, set DIP Switch
10.
Turn ON the GAS and WATER supply to the FT.
11.
Turn ON the FT.
12.
Connect a manometer to the manifold pressure port. For dual port manometers, use the positive pressure
side. Check for proper manifold gas pressure. Refer to Table C.
CO
2
Manifold Pressure Port
MFTHW 80/100
CO
2
120/140/175/199
MFTHW 80/100
120/140/175/199
Refer to the below table.
Refer to the below table. Manifold pressure
Gas Valve for
MFTHW 100
Manifold pressure
MFTHW 140
MFTHW 100
MFTHW 175
MFTHW 140
MFTHW 175
MFTHW 199
MFTHW 199
Table C
13.
Establish a call for heat. You may need to disconnect the outdoor reset if you are making this gas
conversion during warm weather.
OFF
Normal Operation
Normal Operation
LP Propane
2" Vent Size
140 199
5 to OFF
for LP Propane.
value
Figure D
value
The gas valve on
the smaller models is
mounted vertically.
Propane Gas (LP)
100 & 140 MBH
Propane Gas (LP)
NOTE: Values are in the range of -.001 to -.35 Inches WC are indicative
of proper set-up. If your readings are outside this range, please call
technical support.
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
Shown is a
Model 140
with 3"
Venting and using
Natural Gas
Propane Gas (LP)
2˝ VENT 3˝ VENT
9.5~11%
Propane Gas (LP)
2˝ VENT 3˝ VENT
9~10.5 %
9.5~11%
9~10.5 %
-0.075˝ WC
-0.003˝ WC
-0.130˝ WC
-0.075˝ WC
-0.004˝ WC
-0.003˝ WC
-0.169 ˝ WC
-0.130˝ WC
-0.015˝ WC
-0.004˝ WC
-0.169 ˝ WC
-0.169˝ WC
-0.015˝ WC
-0.015˝ WC
-0.169˝ WC
-0.015˝ WC
(Customer Service, Service Advisors)
Document 4387
Natural Gas (NG)
Manifold Pressure Port
2˝ VENT 3˝ VENT
8.5~10.5%
Natural Gas (NG)
2˝ VENT 3˝ VENT
8~10%
8.5~10.5%
8~10%
Natural Gas (NG)
199 MBH
Gas Valve for
-0.070˝ WC
Natural Gas (NG)
-0.000˝ WC
-0.100˝ WC
-0.070˝ WC
-0.002˝ WC
-0.000˝ WC
-0.129˝ WC
-0.100˝ WC
-0.015˝ WC
-0.002˝ WC
-0.129˝ WC
-0.129˝ WC
-0.015˝ WC
-0.015˝ WC
-0.129˝ WC
-0.015˝ WC
(Applications Engineering)
pg 3 of 4