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Toyotomi just announced there new Laser 734 heater. About the only thing new is that this unit has a BlueTooth function.
All other models of the Toyotomi Laser line today, have gone to a "positive pressure " model. This means that "no" exhaust touches the fan. The combustion fan pushes all the air through the heater and out the exhaust. No combustion byproducts touch any fan.
The older Toyos (Laser 56, L73) were what we call "negative pressure units". They had two fans on a common shaft. One provided combustion air to the burner and the other sucked exhaust products out of the burner chamber and heat exchanger. Of course, the exhaust that passed by the fan would get it covered with soot over time. This reduced the service time because the fan needed to be cleaned and in worst cases caused the blower motor to get out of balance and destroy the motor.
I do not understand Toyotomi's insistence in keeping the L730 line a "negative pressure" unit. In days gone by Monitor had 40K BTU units. They seemed to function OK, even though they had their own different problems.
In the early days there was a thought process discussed around the Toyostove business that you could not make a 40K BTU unit run right as a positive pressure unit. That idea was put to bed by Monitor 441 and M2400, both of which functioned fine.
It's long over due for Toyotomi to upgrade their 40K BTU units to a positive pressure design.
Tom
All other models of the Toyotomi Laser line today, have gone to a "positive pressure " model. This means that "no" exhaust touches the fan. The combustion fan pushes all the air through the heater and out the exhaust. No combustion byproducts touch any fan.
The older Toyos (Laser 56, L73) were what we call "negative pressure units". They had two fans on a common shaft. One provided combustion air to the burner and the other sucked exhaust products out of the burner chamber and heat exchanger. Of course, the exhaust that passed by the fan would get it covered with soot over time. This reduced the service time because the fan needed to be cleaned and in worst cases caused the blower motor to get out of balance and destroy the motor.
I do not understand Toyotomi's insistence in keeping the L730 line a "negative pressure" unit. In days gone by Monitor had 40K BTU units. They seemed to function OK, even though they had their own different problems.
In the early days there was a thought process discussed around the Toyostove business that you could not make a 40K BTU unit run right as a positive pressure unit. That idea was put to bed by Monitor 441 and M2400, both of which functioned fine.
It's long over due for Toyotomi to upgrade their 40K BTU units to a positive pressure design.
Tom
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