5
Page
INTRODUCTION
•
This manual provides informa
tion
necessary for the installa
tion,
opera
tion,
and maintenance
of the micro-boiler.
•
The model descrip
tion
is listed on the ra
ting
plate which is a
tt
ached to the side panel of the
micro-boiler.
•
Please read all installa
tion
ins
tructions
completely before installing this product.
•
If you have any problems or ques
tions
regarding this equipmen
t,
consult the manufacturer or
its local representa
ti
ve.
•
These
high e
fficiency
models
have a built-in secondary heat exchanger that absorbs latent
heat from the exhaust gas.
•
The principle behind condensing micro-boilers is simple:
*This diagram illustrates condensing micro-boiler design concepts only and does not accurately
represent the micro-boiler’s physical descrip
tion.
1. Your thermostat indicates a need for heat and turns on a circulator pump.
2. Water enters the boiler.
3. The water
fl
ow sensor detects the water
fl
ow.
4. The computer
initi
ates the fan motor and sends a signal to the igniter to create an
ignition
spark.
5. The gas ignites and
flames
appear within the burner chamber.
6. Water circulates through the heat exchanger and then gets hot.
7. Using thermistors to measure temperatures throughout the micro-boiler
,
the computer modulates
the gas and water valves to ensure proper output water temperature.
8.
Your room reaches desired temperature and the micro-boiler shuts off.
Exhaust
Secondary
heat exchanger
Intake port
Condensate
drain port
Cold water inlet
Gas
Hot water outlet
Computer board
Fan motor
Gas valves
Thermistor
Thermistor
Bypass valve
Primary
heat exchanger
Exhaust thermistor
Water control valve
Thermistor
Flow sensor
Burners