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Part number 550-100-260/0520
3
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
The corr
osion resistant fire tube heat exchanger is our method of
transferring heat from the combustion chamber to the water.
Note !
: Combi shows cover plate (Item 2) (insulation removed for clarity),
Heating Only has insulation covering shown.
The advanced blower design and air inlet silencer on ECO
Tec boilers
results in very quiet operation. Air enters the boiler enclosure through
the air intake adapter (Item 21), flows through the enclosure, enters
the air inlet silencer (Item 5), then enters the venturi (Item 6) where it
mixes with gas before entering the blower. The blower pulls air through
these components and then pushes it through the cover plate
(Item 2)
to the burner (Item 13- not shown).
The automatic gas valve references the pressure in the cabinet and
allows gas to flow when the control (Item 18) applies power. (An on/
off switch is attached to the gas valve. It allows the shutting off of the
gas supply for servicing or shut down).
The horn-shaped air inlet silencer significantly reduces fan noise,
providing exceptionally quiet operation.
When air flows through the venturi, a negative pressure is created.
This causes gas to flow from the gas valve into the venturi, where it is
mixed with the air. The gas/air mixture then continues into the blower.
The pump is used to circulate hot water from the boiler, and then pass
it into heating system or the brazed plate heat exchanger.
This dual sensor monitors boiler outlet water temperature. The control
adjusts boiler firing rate so the outlet water temperature is correct,
based on the calculated (if outdoor reset used — see page 149) or
fixed target temperature.
This sensor monitors boiler in water temperature. The Control may
reduce boiler input depending on if the boiler in and boiler out water
temperature difference is too large
.
The electronic color touch screen display is used to configure boiler
settings and monitor boiler operation. This display allows changing
display mode, selecting and adjusting control settings, and resetting
the control after lockout.
Internal flue pipe that carries exhaust gasses from heat exchanger to
vent/flue adapter.
Made with high-grade stainless steel construction, the burner uses pre-
mixed air and gas. The burner and control provide modulating firing.
3/4
This plug can be removed to install a low water cut-off (LWCO).
This stainless steel flexible gas line connects the incoming gas line to the
gas valve.
The gas line has a ½” Male NPT connection for installation.
Air pressure switch monitors maximum flue pressure.
120VAC field wiring connections.
The bottom middle knockouts are designated for line voltage wiring
only. Ensure all wiring entrances are sealed.
22
The bottom right side and top right knockouts are designated for
low voltage wiring only. Ensure all wiring entrances are sealed.
Shipped loose for field piping. Pipe drain valve on reducing tee at the
lowest point of return piping to boiler. See instructions, page 13 in
this manual.
The outlet at the bottom of the boiler to drain condensate. The
condensate trap assembly attaches here.
The condensate trap assembly is field-installed, condensate drain trap
is connected to the condensate tube (Item 24) as shown in this manual.
The jacket door is sealed to the boiler assembly around its entire
perimeter.
Two (2) latches secure the door in place.
The burner flame is ignited by applying a high voltage to the ignition
electrode. This causes a spark (from electrode to ground). After
ignition, the electrode measures flame signal.
The quartz glass window provides a view of the burner surface and
the flame.
This dual sensor monitors the flue gas exit temperature. The control
will shut down the boiler if flue gas temperature gets too hot.
This protects the flue pipe and the heat exchanger from overheating.
The 120V/24V transformer provides 24V to low voltage control
circuitry. Do NOT splice wiring into transformer.
The air baffle protects internal boiler components by diverting any
incoming moisture or debris away from critical components.
This secondary heat exchanger allows heat to transfer from the boiler
to the domestic water.
This sensor monitors domestic hot water leaving the brazed plate. The
control reduces or increase boiler input, depending on how close the
water is to target set point.
This valve will change boiler water flow either through the brazed plate
or bypass the braze plate and out to the heating system.
This valve will change boiler water flow either through the brazed plate
or bypass the braze plate and out to the heating system.
This sensor monitors the DHW (domestic hot water) flow rate. When
flows 0.5 GPM or greater are detected, the boiler control will allow the
boiler to turn on and modulate accordingly.
Use 3/4" tee and 3/4" street elbow to connect relief valve. It is
recommended to connect an automatic air vent to top tee connection.
3/4
3/4
The ECO
Tec
Gas-fired water boilers
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