Heatmaster G100 Operation And Maintenance Manual page 15

To maintain pressure in an existing boiler system while using an outdoor furnace a wa-
ter-to-water heat exchanger is used. The water-to-water exchanger is installed in-line
on the supply side of the existing pressurized boiler system.
FLAT PLATE EXCHANGER FOR PRESSURIZED BOILER SYSTEMS
FLAT PLATE EXCHANGER FOR PRESSURIZED BOILER SYSTEMS
Flat plate exchanger systems that are used with pressurized systems such as in floor
heating systems help to heat the water going in to the pressurized system while keep-
ing the two systems separate. Because an outdoor furnace is an open system (not
pressurized) and the system tied in to in this type of application is pressurized it allows
both systems to stay the same while being operational.
The water supplied by the outdoor furnace will heat the water in the pressurized system
while the present heat source in the pressurized system (such as a boiler) can be used
as a back up heat source in case of emergency or need for additional heat.
When connecting the furnace to an existing pressurized boiler system:
the furnace must not be installed so that it interferes with normal heat delivery of

the existing boiler system
The furnace must be installed without affecting the operation of the electrical and

mechanical safety controls of the original boiler
Provide for a changeover from one fuel to the other without requiring manual ad-

justment of any controls or components other than the thermostats.
Have provisions for preventing, or adequate water capacity within the boiler to

prevent damage from loss of circulation due to electrical power failure.
Be installed without changing the function of the controls or rewiring the original

boiler. A wiring interconnection is permitted. The electrical system of both boiler
shall be powered from a single branch circuit without exception.
Boiler Safety
Operate the boiler periodically to ensure that it will operate satisfactorily when

needed.
Do not relocate or bypass any of the safety controls in the original boiler installation

 The operation of the boiler must be verified for acceptable operation before and after
installation of the add-on appliance by a gas fitter who is recognized by the regulatory
authority
Do not connect to any chimney or vent serving a gas appliance

Installation should comply with requirements of CAN/CSA-B365, and changes to the instal-
lation should comply with CSA B139 (for oil-fired boilers), C22.1 (for electric boilers), or
CAN/CSA B149.2 (for gas fired boilers).
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WATER - TO - WATER HEAT EXCHANGERS
WATER - TO - WATER HEAT EXCHANGERS
G Series Outdoor Furnaces
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