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Part number 550-100-260/0520
46
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
System water piping methods
It is recommended, but not required, to use primary/
secondary piping to the boiler. Using primary/
secondary piping will provide the most accurate
desired system heating temperature.
1. Read the NOTICES and guidelines beginning on page
46 to determine if the system is eligible for this piping strategy.
2. If eligible, reference suggested piping layouts on pages 47
and 48.
3. Use primary/secondary piping if system ineligible.
Using primary/secondary piping will provide the most accurate
desired system heating temperature. Reference suggested piping
layouts on pages 50-55.
Some installations can be piped in numerous
other ways that will work equally as well as the
suggestions here.
Verify the application will work:
Direct connect will only work with the ECO
Tec
80/110/150 models.
The minimum temperature rise across the heat
exchanger is 20°F during high fire operation. The
factory installed circulator will provide between
a 20° and 35°F temperature rise across the heat
exchanger depending on boiler model (System
head loss must be less than what is listed in Table
6 , page 47). If the temperature drop across the
heat exchanger is lower than 20°F during high fire,
the flow rate will need to be reduced until 20° is
achieved.
Systems zoning with circulators must use primary/
secondary piping layout using guidelines starting
on page 50.
Verify that the internal circulator will provide enough head to the
system, see Table 6 , page 47.
If the internal circulator will not provide enough head for the
system, then direct connect piping can not be used. The system
will have to be set up for primary/secondary piping (see page 50).
1. To determine whether direct connection will provide suitable
flow for the intended application
2. The minimum temperature rise across the heat exchanger
is 20°F during high fire operation. Using flow rates higher
than the maximum is NOT RECOMMENDED. The factory
installed circulator will provide the temperature rise given
in Table 2, page 47 during high fire operation if the system
head matches the corresponding table value.
3. Design zoning to ensure minimum flow rate is maintained
under any call for heat condition that could see full input
rate (High Fire).
Use a primary/secondary piping layout if the total flow through
the heat exchanger will be higher than the maximum.
Any system zoned with zone valves must include a
by-pass pressure regulator. Failure to comply may
reduce pump life.
The boiler circulator is factory-installed in the boiler.
remove or relocate the boiler circulator.
The boiler circulator is selected to ensure adequate
flow through the boiler.
Failure to comply could result in unreliable
performance and nuisance shut downs from
insufficient flow.
If replacing included circulator with a replacement
Taco model, replace only with Taco Model 0015e3
circulator. Set to Max.
Expansion tank location
Figure 56 and Figure 58 show typical installation of the system
expansion tank. It is highly recommended that you locate the air
separator and expansion tank as shown in the suggested piping
drawings on page 47 and page 48.
Ensure that the expansion tank size will handle boiler and
system water volume and temperature. See tank manufacturer’s
instructions and ratings for details. Additional tanks may be added
to the system if needed to handle the expansion. These tanks may
be installed by connecting to tees in the system piping.
Undersized expansion tanks cause system water to
be lost from the relief valve and makeup water to be
added through the fill valve. Eventual boiler failure
can result due to excessive make-up water addition.
Always locate the cold-water fill connection at the
expansion tank. Never locate this elsewhere.
Diaphragm- or bladder-type tank:
Refer to Figure 56 for suggested piping when using a diaphragm-
or bladder-type expansion tank.
Install an automatic air vent on top of the air separator, per
separator manufacturer’s instructions.
Diaphragm- or bladder-type expansion tank—
Calculated cold fill pressure should equal tank
air charge pressure. Always check pressure and
charge tank with tank removed from system to
be sure reading is accurate. Boiler relief valve
is set for 30 PSIG. Operating pressure of system,
after temperature expansion above cold fill pressure,
should not exceed 24 PSIG to avoid weeping of relief
valve.
Direct Connect System Piping - Single Boiler System
80/110/150 Boilers only
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