LAARS Heating Systems
Page 32
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 3 of 4
Figure D
WARNING
DIP Switch Settings
Table B
9.
Turn
ON
the GAS and WATER supply to the Mascot FT.
10.
Per Table B, set DIP Switch
5 to OFF
for LP Propane.
11.
Per Table B
,
change dip switches 6 and 7 to
a minimum fi re state
(MIN Fire)
12.
Turn
ON
the Mascot FT.
13.
Open the manifold pressure port by loosening the screw two turns as shown in Figure E.
14.
Connect a manometer to the manifold pressure port. For dual port manometers, use the positive pressure side.
15.
While operating the water heater, check CO2 measurement and refer to Table C
16.
Adjust the Cap Screw / Offset Adjustment (See Figure E) until you are within range of Table C.
17.
Turn
OFF
the Mascot FT.
18.
Repeat steps 11 thru 17 at
MAX
FIRE by changing DIP switches 6 and 7.
BUT Do NOT ADJUST MAX FIRE.
If the MAX FIRE is too Low, then go back to MIN FIRE and adjust MIN FIRE to come up. Be sure to shut
boiler OFF before moving DIP switches.
If the MAX FIRE is too High, then go back to MIN FIRE and adjust MIN FIRE to come down. Repeat this
process between the MIN FIRE settings and MAX FIRE settings (
without adjusting at MAX FIRE
) until
both MAX and MIN are within allowable CO2 as per Table C.
ON
OFF
#
MIN
Fire
Normal Operation
7
MAX
Fire
Normal Operation
6
NG Natural
LP Propane
5
3” Vent Size
2” Vent Size
4
Do Not Touch
Normal Operation
3
Do Not Touch
Normal Operation
2
Normal Operation
Do Not Touch
1
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.
Figure E
4.13 Natural Gas to Propane Conversion
SECTION 4. Installation
