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M
ascot ST Gas Conversion Kit
4.13 Gas Conversion Kit
Kit # R20769
H2373700-
The Laars Mascot ST condensing gas water heater is
confi gured for Natural Gas (NG) from the factory.
If your gas supply is Propane Gas (LP), your water
heater can be converted to burn propane gas as
follows:
NOTICE
The Natural Gas to Propane Conversion Kit (# R20769)
for the Mascot ST, is not included in the original box. To
order the conversion kit, please visit laars.com/support
to get the contact info for your nearest Laars Sales
Representative.
WARNING
This conversion kit must be installed by a qualifi ed service
agency in accordance with the manufacturer's instructions
and all applicable codes and requirements of the authority
having jurisdiction. You must follow these instructions
to minimize the risk of fire or explosion or to prevent
property damage, personal injury or death. The qualified
service agency is responsible for the proper installation
of this kit. The installation is not proper and complete until
the operation of the converted appliance is checked as
specified in the manufacturer's instructions supplied with
the kit. Installation must conform with local codes and the
latest edition of the National Fuel Gas Code, ANSI Z223.1
and CAN-B149 Failure to follow instructions could result in
serious injury or property damage.
The qualified agency performing this work assumes
responsibility for gas conversion.
CAUTION
This water heater has already been set to burn natural
gas, but can be converted to burn propane gas. Before
operating the heater, verify the type of gas supplied to
your water heater
Original
Natural Gas (NG)
Needle / Ring Ass'y
9.7 mm (0.382˝)
Table A.
Natural gas to Propane gas conversion parts
Laars Kit Document #4286
Conversion Propane Gas (LP)
Orifi ce
Needle / Ring Ass'y
9.5 mm (0.374˝)
6.8 mm (0.268˝)
Customer Service and Product Support:
Customer Service and Product Support:
Headquarters:
800.900.9276 • Fax 800.559.1583
Headquarters:
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
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
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com
ON / OFF
To convert from natural gas
to propane gas
Steps 1 thru 27
1.
Turn OFF the Mascot ST.
The ON / OFF button is located at the bottom left of the
Control Display.
2.
Turn OFF the GAS and WATER supply to the Mascot ST
(valves are located on the plumbing pipes.)
3.
Using a Phillips screwdriver, remove the 4 screws on the
front cover. See Figure A.
4.
Locate the AGM (Air Gas Mixture) Chamber. See Figure B.
In order to open up the AGM Chamber and complete this
conversion, the Ignition Transformer and the Combustion
Air Intake Assembly must be removed.
5.
The Ignition Transformer will lift and pop from it's location
on the side wall. It is designed to do this. Let it hang and do
not disconnect the wires from the transformer.
6.
Then remove the Combustion Air Intake Assembly by
removing the screw at the bracket ( See Figure C) and
the screw holding the Intake Assembly to the AGM cover.
The bracket then hinges outward so that the entire Intake
Assembly can be removed as one piece.
7.
Using a short Phillips screwdriver, remove the 2 screws
from the AGM Actuator. Do not disconnect the actuator.
Keep all screws and washers. Refer to Figure C.
Orifi ce
7.0 mm (0.276˝)
20
Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355
20
Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355
www.Laars.com
Litho in U.S.A. © Laars Heating Systems 1503 Document 4286
LAARS Heating Systems
Document 4286
8.
IMPORTANT!
Using a paint pen or
a sharp object, place a mark onto the
Inner Mount near the top screw (there
are 3 screws). See Figure C. This
'Top' mark, that you make, will be very
important during reassembly.
9.
Then remove the 3 screws. The AGM
Cover and the Inner Mount will separate
800.900.9276 • Fax 800.559.1583
800.900.9276 • Fax 800.559.1583
(Customer Service, Service Advisors)
(Applications Engineering)
www.Laars.com
pg 1 of 4
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