T-M50 / T-M50 ASME Service manual
Ver. 1.05
8
CONFIDENTIAL
5. Schematic diagram
1.
When a hot water tap is opened, cold water enters the T-M50.
2.
The water flow sensor detects this water flow and sends this information to computer.
3.
The computer initiates fan motor and sends signal to igniter to create ignition spark.
4.
The main, proportional, and solenoid gas valves open to allow gas input.
5.
The gas ignites and flames appear inside the burner chamber.
6.
Water circulates through the heat exchanger and is heated up to the set temperature.
7.
Using thermistors to measure temperatures, the computer modulates the gas and water valves to
ensure proper output water temperatures.
8.
When the tap is closed, the T-M50 shuts down.
Heat
Exchanger
Output
Thermistor
Water
control
valve
Flow sensor
Mixing
Thermistor
Exhaust
Output
Thermistor
Heat
Exchanger
Water control
vale
Flow sensor
Inlet
Thermistor
Computer board
Burner
Gas valve
Fan motor
Fan motor
Hot water
outlet
Cold water
inlet
Gas
Inlet
Thermistor
120 VAC
