Mascot FT Combination Boiler
Page 3
Model Name
MFTCW140
Gas Input Rate
MAX
140,000 Btu/h
MIN
28,000 Btu/h
Hot Water Capacity
35°F Rise
7.1 GPM
45°F Rise
5.5 GPM
77°F Rise
3.2 GPM
Installation
Indoor / Wall hung type
Flue System
Sealed Combustion Direct / Single Vent / Concentric Vent
Vent Run
2˝(50ft) , 3˝(100ft) Schedule 40 CPVC, PP, PVC
Gas Supply Pressure
NG
3.5˝ WC to 10.5˝ WC
LP
8.0˝ WC to 13˝ WC
Manifold Pressure
Gas type
LP
NG
Vent size
2˝ VENT
3˝ VENT
2˝ VENT
3˝ VENT
High fire
-0.85±0.2"
-0.5±0.2"
-0.75±0.25"
-0.4±0.25"
Low fire
0.005±0.005"
-0.02±0.005"
-0.005±0.005"
Power Supply
Main Supply
120V 60Hz / 4A
Maximum Power
Consumption
160W
Ignition System
Direct Electronic Ignition / Automatic Flame Sensing
Burner System
Single Orifice Premixed Fuel Modulation
Gas Valve System
Combination modulating (Current proportional)
Minimum Flow Rate
0.5 GPM
Dimensions
W17.25˝ - H29.0˝ - D15.5˝
Weight
110 lbs
Sub Heat Exchanger Water Capacity(DHW)
Under 1 Gallon
Main Controller / Control Panel
NGTX-900CP / P-920C
Water Pressure
Min 15 ~ Max 150 PSI
Connection Sizes
Cold Water Inlet / Hot Water
Outlet
3/4˝ NPT
Space Heating Supply/Return
1˝ NPT
Gas Inlet
1/2˝ NPT
Materials
Casing
Cold Rolled Carbon Steel
Heat Exchanger
Primary Heat Exchanger : Stainless Steel
Sub Heat Exchanger : Stainless Steel
Safety Devices
Flame Rod, Overheat Cut Off Device, Gas Valve Operation
Detector, Exhaust Temperature High Limit Switch, Water
Temperature High Limit Switch
2.2 Specifications
Customer Service and Product Support:
800.900.9276 • Fax 800.559.1583
Headquarters:
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
Litho in U.S.A. © Laars Heating Systems 1503 Document 4288
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 4288
M
ascot FT Gas Conversion Kit
pg 4 of 4
Figure F (Conversion label)
19.
Once the CO2 and manifold pressure measurements for both MIN and MAX Fire are correct,
turn OFF the Control Display
and set DIP switches 6 and 7 to the OFF position for
Nominal Fire (normal operation).
Turn the Control Display
back on when done.
20.
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.
21.
Put the boiler cover back on and assemble/tighten the 4 screws that hold the cover in place.
WARNING
Always make sure that the Control Display is turned
OFF
before changing any DIP switch. Then turn Control
Display back ON to continue with CO2 measurements.
Table C
Table D
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)___________________________________
_____________________________________________
CO
2
value
Natural Gas (NG)
Propane Gas (LP)
2˝ VENT
3˝ VENT
2˝ VENT
3˝ VENT
MFTCW140
MAX FIRE
8.5 - 10.5%
9.5 - 11%
MIN FIRE
8 - 10%
9 - 10.5 %
Manifold pressure
Natural Gas (NG)
Propane Gas (LP)
2˝ VENT
3˝ VENT
2˝ VENT
3˝ VENT
MFTCW140
MAX FIRE
-0.15” W.C
-0.216” W.C
-0.15” W.C
-0.216” W.C
MIN FIRE
0” W.C
0.002” W.C
0.1” W.C
0.079” W.C
NOTE: Installer is required to verify combustion
settings as part of the installation process.
CO should not exceed 200 ppm.
H2373800-
