Weil-McLain Eco Tec 2 Series Setup guide

is manual must only be used by a qualied heating installer/service technician. Read all instructions, including this manual and
all other information shipped with the boiler, before installing. Perform steps in the order given. Failure to comply could result in
severe personal injury, death or substantial property damage.
Part number 550-100-272/1021
Series 2
80/110/150/199
Wall Mount Gas - Fired
Condensing Boilers – Combi and Heating Only Models
Advanced Manual
Multiple Boiler Installation & Settings + Single Boiler Advanced Settings

Part number 550-100-272/1021
– 2 –
ECO®Tec series 2 gas-fired water boiler – advanced manual
Contents
Follow all instructions for installation, start-up
and servicing in the ECO Tec boiler manual.
Use this Advanced Manual for multiple boiler
installation guidelines and control settings and
for single boiler advanced control settings.
HAZARD DEFINITIONS
e following dened terms are used throughout this manual to
bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
Indicates presence of hazards that will cause severe
personal injury, death or substantial property
damage.
Indicates presence of hazards that can cause severe
personal injury, death or substantial property
damage.
Indicates presence of hazards that will or can cause
minor personal injury or property damage.
Indicates special instructions on installation,
operation or maintenance that are important but
not related to personal injury or property damage.
IMPORTANT
THE OUTDOOR SENSOR SUPPLIED WITH THE
BOILER MUST BE INSTALLED UNLESS EXEMPTED
BELOW:
In accordance with Section 303 of the 2007 Energy Act, this boiler is
equipped with a feature that saves energy by reducing the boiler water
temperature as the heating load decreases. is feature is equipped
with an override which is provided primarily to permit the use of an
external energy management system that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST
ONE OF THE FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that reduces
the boiler water temperature as the heating load decreases.
• is boiler is not used for any space heating.
• is boiler is part of a modular or multiple boiler system having a
total input of 300,000 BTU/hr or greater.
• is boiler is equipped with a tankless coil (not applicable to ECO
Tec).
If the outdoor sensor is not used, the following
changes must be made to control settings during
control setup:
TARGET ADJUST (in priority menus) must be set
either to NONE (constant supply temperature) or
0–10VDC (remote target).
WWSD must be set to OFF.
ECO Tec Control — Overview . . . . . . . . . . . . . . . 3
Combi Models — For DHW piping . . . . . . . . . . . 6
Multiple boiler installations . . . . . . . . . . . . . . . . 7
EXPRESS Setup — Requirements by Boiler . . . . . . 9
EXPRESS Setup — Steps . . . . . . . . . . . . . . . . .10
EXPRESS Setup — The WIZARD . . . . . . . . . . . . .11
EXPRESS Setup — Typical Application A . . . . . . . .17
EXPRESS Setup — Typical Application B . . . . . . . .21
EXPRESS Setup — Typical Application C . . . . . . . .26
EXPRESS Setup — Typical Application D . . . . . . . .30
Field wiring (see wiring diagram, ) . . . . . . . . . . . . . . . 33
Wiring diagram — schematic . . . . . . . . . . . . . . .44
Wiring diagram — ladder . . . . . . . . . . . . . . . . .46
Zoning with the ECO Tec Control. . . . . . . . . . . . .48
Control operation . . . . . . . . . . . . . . . . . . . . . .50
Control settings menus . . . . . . . . . . . . . . . . . .51
HOMEOWNER NAVIGATION menus . . . . . . . . . . .56
BLUETOOTH . . . . . . . . . . . . . . . . . . . . . . . .57
CONTRACTOR menus . . . . . . . . . . . . . . . . . . .58
BOILER SETTINGS menu . . . . . . . . . . . . . . . . .59
NETWORK SETTINGS menu . . . . . . . . . . . . . . .60
ROTATION AND SEQUENCE . . . . . . . . . . . . . . .61
System Settings . . . . . . . . . . . . . . . . . . . . . .64
Network Boiler PRIORITY menu . . . . . . . . . . . . .65
NETWORK INPUTS menu . . . . . . . . . . . . . . . . .71
SERVICE menus . . . . . . . . . . . . . . . . . . . . . .72
• is device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference,
and (2) this device must accept any interference
received, including interference that may cause
undesired operation.
Assembled From
tested components
Complete system
not tested
FCC: Wireless device unique identier registered
with the U.S. Federal Communications
Commission.
IC: Wireless certication approval number
unique to all devices, required for Canada.

Part number 550-100-272/1021 – 3 –
ECO®Tec series 2 gas-fired water boiler – advanced manual
ECO Tec control setup
1. Set control parameters using the WIZARD option provided on ini-
tial start-up or manually enter parameters using control menus (see
Figure26,page56 and following pages for information.)
2. See Express setup instructions beginning on page10 for basic
systems and minimum settings required.
Boiler Model, Altitude and Fuel Type are critical settings.
Failure to set correctly could result in severe personal injury, death or
substantial property damage.
Temperature settings — You must ensure that the control is set for the
proper water temperatures for the system. Excessive water temperature
can cause signicant property damage in some applications.
Multi-temperature systems — If the heating system includes circuits
that require lower temperature water (radiant slab circuits, for example)
as well as higher temperature circuits (DHW, nned tube baseboard, etc.),
it is recommended to protect low-temperature circuits with limit controls
that are wired to an control external limit circuit. Failure to provide
regulation can result in substantial property damage.
Control Features
 Advanced interface and troubleshooting via Bluetooth®
communication.
 Color touch-screen display for ease of operation monitoring and
troubleshooting.
 Easy conguration with WIZARD step-by-step setup including
on-screen help.
 e ECO Tec control can communicate to existing UnityTM controls
in a multi-boiler network.
 ree (3) programmable priority assignments for up to four (4)
heat inputs.
 Preset operating parameters for typical heating systems, including
target temperatures, reset curves and circulator assignments.
 Integral outdoor reset option, with reset curves matched to the
system type selected.
 ModBus communications for external communication and
monitoring.
 0-10VDC input modulation or remote target input.
Figure 1 Control sequence of operation
Display
status
text
Control action
(Also see Figure20,page50)
POWER
UP
yCheck the boiler model listed on the power-up screen.
If it is not correct, turn o the boiler. See page 59 for
instructions to change setting.
yWhen power is turned on, the screen lists sensors that
are detected. If any sensor is not listed, make sure it is
connected correctly. Turn o power and restart.
Standby
yStandby - no calls for heat.
yToggles through no dots, 1 dot, 2 dots, then 3 dots
while in standby (wrench symbol will show instead if
maintenance is needed).
Blower
ON
yCall for heat detected.
yDisplay on with BLUE banner (space heating) or
PURPLE banner (DHW).
yStart min/max timers if more than one system is call-
ing - highest priority starts rst.
yStart circulators for this priority setup based upon
settings.
yCalculate target temp — If sensor temp is below target
temp, begin ring sequence.
yBlower to ignition speed for prepurge.
Ignition
yAer prepurge times out, begin ignition cycle.
yActivate gas valve and ignition spark.
yContinue ignition spark for ignition period.
yTurn o spark and use electrode to check for ame
signal.
Space
Heating
yFlame detected.
yRelease boiler to modulation.
yNOTE: If ame is not detected, the gas valve is turned
o, blower turns on (postpurge), and control starts
cycle again. Aer 5 failures, the control waits 60
minutes, then tries again.
yIf priority timer times out, switch to next priority and
start priority timer.
yIf demand satised, go to postpurge.
DHW
Heating
yFlame detected.
yRelease boiler to modulation.
yNOTE: If ame is not detected, the gas valve is turned
o, blower turns on (postpurge), and control starts
cycle again. Aer 5 failures, the control waits 60
minutes, then tries again.
yIf priority timer times out, switch to next priority and
start priority timer.
yIf demand satised, go to postpurge.
Blower
OFF
yDemand satised (temperature reaches target tempera-
ture or limit setting).
yGas valve o.
yBlower to ignition speed for postpurge.
yReturn to standby aer purge.
Maintenance
yDisplay banner turns BLUE, toggling between graphic
screen and maintenance screen (occurs if maintenance
schedule timer times out).
yWill show during standby only.
yBoiler operates as normal.
Error/fault
yDisplay banner turns RED due to error or limit event.
WWSD
yWarm weather shut down - the boiler will not be
allowed to re on space heating if the outdoor tem-
perature is greater than the WWSD setting.
yDHW operation is not aected by WWSD.
ECO Tec control overview
yControl inputs and outputs allow operation of multiple heating circuits
(space heating and DHW, for example).
yUp to three priority levels can be set, providing automatic switch-over
on demand.
yis manual provides quick set-up information for boiler installations.
ECO Tec control operation
ye control responds to signals from the room thermostats, DHW
aquastats (if used), boiler sensors (Boiler Out, Boiler In, ue temperature),
outdoor temperature and system sensors, if used. Combi models will also
respond to signals from DHW ow sensor and DHW temperature sensor.
ye control automatically adjusts blower speed to match boiler output to
space heating and/or DHW heating demand.
ye default control settings provides up to four (4) space heating zones.
e control can be easily set up for operation with a DHW zone, with or
without domestic priority.
ECO Tec control WIZARD
ye Wizard leads through a step-by-step setup procedure designed for
the application chosen.
yContext-sensitive help is available to explain the purpose of key setup Items.
ECO Tec Control — Overview

Part number 550-100-272/1021
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ECO®Tec series 2 gas-fired water boiler – advanced manual
Control features continued)
 Up to four (4) congurable outputs, including one (1) internal
boiler circulator output.
 Additional heat demand operation to call a second heat source
to help supply the energy required for heating.
 Advanced PI response to anticipate system needs.
 Flue temperature modier to target temperature.
 Modulation based on ue sensor, Boiler out, DHW Flow sensor
and DHW sensors.
 Dual temperature sensors on boiler outlet, DHW outlet and ue,
providing redundant protection.
 Boiler is shipped with an outdoor sensor.
 Blower speed modulation to control boiler ring rate.
 Alarm relay on error/fault for use with an audible safety.
 Optional PREHEAT mode – Automatically maintains boiler
water temperature to reduce boiler reaction time on Combi
domestic hot water (DHW) draws.
 Select the mode of PREHEAT, between O, Economy and High
Performance.
 ECO BOOST – Reacts to homeowner use to recharge boiler water
temperature once, if needed to reduce boiler reaction time on
subsequent Combi domestic hot water (DHW) draws.
 Select whether or not to use the ECO BOOST feature. If
conditions are met, the burner will continue to re aer Combi
ow ends to recover temperature within the heat exchanger.
 Blower calibration – allows ne tuning of blower control to reach
purge speeds faster, reducing time to heat delivery
.
 Temperature units – Select between using °F or °C.
 Manual Reset High Temperature Limits – Set High Limit
temperature safety value.
 Daylight Saving Time – Select whether your boiler will obey
Daylight Savings Time for your region.
Multiple boiler operation
ye ECO Tec boiler has an auto detection feature for multiple
boiler networks. e Master will automatically detect the
presence of the other boilers wired to the network. (Feature
requires separate kit).
yere will be a 30 second to 1 minute period until the Master
may see the shadow boilers.
yEach shadow boiler must be assigned a network address, from
2 through 8. e address for each boiler must be unique, NOT
selected for any other boiler.
yAerwards, the Master will build a network based on the
communications shared. If a boiler loses communication, the
Master will automatically re-assign the lost boiler to where it
was before once it is back on the network.
yWhen network inputs turn on, the Master boiler will enter the
Network Modulation routine.
yree system modulation types—SERIES, PARALLEL, AND
SMART.
yUsing system sensors, the Master will modulate the entire
network to meet the energy requirements of Network Priority
1 and Network Priority 2 inputs when they are on.
yWhen a Local Priority input becomes active (switch closes),
modulation for that input is not controlled by the Master, but
instead is le to that local boiler using its own local Boiler Inlet
and Outlet sensors.
yEach of the four (4) inputs (Input 2 and 3 for Combi models)
on the Master or any of the Shadow boilers can be assigned as
Network Priority1 or 2 or assigned as Local Priority1 or 2.
Network Priority settings are common across all the boilers.
ese Network Priority settings can only be adjusted from the
Master boiler.
Sequence of operation
Figure1,page3 is a summary of the operating sequence for the
control.
ye statuses shown appear in the display as the control cycles
the boiler. See Figure21,page51 for screen shots.
ye display banner will be red if a problem has been detected.
ECO Tec Control Priorities & Input/
Outputs
For heating installations with multiple systems, the control uses
PRIORITIES to determine the order of operation of the systems.
ye control’s MAX and MIN time settings determine the maxi-
mum and minimum times a system will be operated before
being turned o to allow another system to operate.
yA typical example is DHW priority — heat demand from the
DHW system is given preference over space heating, if set to
use Priority 1. (Combi DHW is defaulted to Priority 1 and
cannot be changed).
ye MAX ON TIME setting controls the maximum time a
priority will be allowed to run before switching to a lower
priority’s call for heat.
ye MIN ON TIME setting controls the minimum time a
priority will be operated before switching to a higher priority’s
call for heat, or the next lower priority.
yEach PRIORITY has its own set of operating parameters.
ye control prompts the user to select the system type (nned
tube baseboard, DHW, etc.) and is factory programmed with
parameters suited to each of these system types.
ye user can also choose CUSTOM to create a system type.
ye 120VAC power output to the boiler circulator is provided
by the boiler’s control board.
ye ECO Tec control provides up to three (3) priorities for
single boiler applications and up to four priorities for network
boiler applications. e order of operation is:
ySingle boilers: PRIORITY 1, PRIORITY 2, PRIORITY 3.
yNetwork boilers: LOCAL PRIORITY 1, NETWORK PRIOR-
ITY 1, NETWORK PRIORITY 2, LOCAL PRIORITY 2.
yFor each boiler in a network, this provides up to two (2) local
priorities, used for heating systems piped directly to the boiler,
such as DHW tanks.
yNetwork priorities are used for heating systems connected in
the primary heating loop and supplied by the boiler network.
ECO Tec Control — Overview (continued)

Part number 550-100-272/1021 – 5 –
ECO®Tec series 2 gas-fired water boiler – advanced manual
yEach boiler has up to four (4) input/output pairs (INPUT/
OUTPUT1,2, 3 and4) for Heating Only boilers, 2 and 3
for Combi models.
yControl setup prompts the user to assign each of these I/O
pairs to a PRIORITY. e control then knows which system
(priority) to operate when the input receives a call for heat. On
a call for heat to an input, the control closes the corresponding
output (120VAC) and begins controlling the boilers according
to the setup for the assigned priority.
yWhen multiple inputs are set up on the same priority, they
will run at the same time if the priority and inputs are active.
Boiler circulator
ye boiler circulator is factory installed inside the boiler
cabinet.
yFor multiple boiler systems, the boiler pump is defaulted to
run and cannot be changed.
The boiler circulator must be installed and
connected. Flow through the boiler must be
provided during all times of operation. Fail-
ure to do so can result in severe personal
injury, death or substantial property damage.
ECO Tec control operation
• e control responds to signals from:
• DHW Flow demand (Combi models only).
• DHW Temperature sensor (Combi models only).
• Room thermostats.
• DHW aquastats (if used).
• Temperature sensors Boiler Out, Boiler In, ue tempera-
ture and when used, outdoor temperature.
• For optimal performance, it is recommended to
install System Supply and Return sensors.
ye control automatically adjusts blower speed to match boiler
output to space heating and/or DHW heating demand.
ye control provides up to four (4) inputs and four outputs
(for circulators or auxiliary devices) plus a h (5) boiler
circulator output based on selected boiler model.
yOutdoor reset must be used in all applications that are not
exempt as described on page 2.
ye outdoor temperature is used for target temperature reset
operation and for the Warm Weather Shut Down (WWSD)
option.
ySystem presets:
e control provides presets by system type for complete
list, see Figure25,page55.
DHW Target
Set DHW target to the required Combi DHW water temperature
for the application according to design mixing valve.
OUTDOOR TEMP FOR MIN TARGET
1. OUTDOOR TEMP FOR MIN TARGET means the outdoor
temperature at which the target temperature reaches its minimum
(Min Target Temp).
ECO Tec Control — Overview (continued)
2. In the examples of Figure2, this occurs at 70 °F (the factory default).
OUTDOOR TEMP FOR MAX TARGET
1. OUTDOOR TEMP FOR MAX TARGET means the outdoor tem-
perature at which the target temperature reaches its maximum value
(Max Target Temp).
2. In the examples of Figure2, this occurs at 0°F outdoor (the factory
default setting).
3. OutDOOR TEMP FOR MAX TARGET should equal the Out-
door Temp (outdoor design temperature) for the installation’s
location.
Outdoor reset operation
1. Set desired temperatures for space heating zones.
2. For an explanation of the target temperatures and associated
outdoor temperatures, see Figure2.
3. e temperature settings discussed below are accessed in the
priority menu for the applicable system. For detailed explana-
tions of the priority menus, see Figure35,page65.
Figure 2 Outdoor reset operation
Figure 3 Remote target operation

Part number 550-100-272/1021
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ECO®Tec series 2 gas-fired water boiler – advanced manual
Hot Water Can Scald!
yConsumer Product Safety Commission and some
states recommend domestic hot water temperature
of 130°F or less.
yWhen installing an automatic mixing valve, selection
and installation must comply with valve manufac-
turer’s recommendations and instructions.
yWater heated to a temperature suitable for clothes
washing, dish washing and other sanitizing needs will
scald and cause injury.
yChildren, elderly, inrm or physically handicapped
persons are more likely to be injured by hot water.
Never leave them unattended in or near a bathtub,
shower or sink. Never allow small children to use a hot
water faucet or draw their own bath. If anyone using
hot water in the building ts this description, or if state
laws or local codes require certain water temperatures
at hot water faucets, take special precautions:
• Install automatic mixing valve set according to those
standards.
• Use lowest practical temperature setting.
• Check water temperature immediately aer rst heat-
ing cycle and aer any adjustment.
Domestic Water Piping – Combi Boiler
1. ermostatic Mixing Valve - An ASSE 1070 automatic
mixing valve for regulating domestic heating water must be
used to regulate the water temperature leaving the plate heat
exchanger. NOTE: the valve must be set to supply a domestic
water temperature of not more than 120 degrees F. It is the
responsibility of the installer to set the valve and remove or
lock the dial depending on valve capabilities.
2. Additional anti-scald devices may be installed at each hot
water faucet, bath and shower outlet.
Combi Models —
For DHW piping
MAX TARGET TEMP
Set Max Target Temp to the required supply water temperature
for the system at design maximum heat loss (typically 180°F for
nned tube baseboard on new installations).
MIN TARGET TEMP
1. Min Target Temp should equal the desire minimum supply water
termperature for the system.
2. e Min Temp is the setpoint whenever the ODT temp is above
the ODT For Min Target and below the WWSD temps.
Setting this value below the Outdoor Temp for Min
Target may reduce the performance of the heating
system at warmer outdoor temperatures.
3. is could be set as low as 60°F, which would supply “zero
heat” when outdoor temperature is 70°F, because supply water
temperature would close to room temperature. See examples in
Figure2,page5.
Remote target operation (0–10VDC
input)
1. is function allows a remote analog input to regulate the supply
temperature for control operation/modulation. is can be
done for any priority.
2. e settings discussed below are accessed in the Priority
menu for the applicable system. For detailed explanations of
the Priority menus, see Figure35,page65.
3. See Figure3,page5 for an explanation of target temperature
vs voltage when using remote target operation.
4. In the priority menu for the applicable system, select 0-10V
for the TARGET ADJUST setting.
5. In the same priority menu, select the VOLTS FOR MIN TAR-
GET and VOLTS FOR MAX TARGET values. VOLTS FOR
MIN TARGET sets the voltage value for the desired minimum
supply temperature. VOLTS FOR MAX TARGET sets the
voltage value for the desired maximum supply temperature.
Remote modulation operation
(0–10VDC input)
1. To use 0-10VDC for remote modulation, go to Contractor
Menu -> System Settings -> select the appropriate priority.
Select Input 2 from System Setting menu, then change Input
2’s source to 0-10V. e priority that is assigned to Input 2
cannot be used by any other Input. Only applicable for Single
boilers. Network cannot use 0-10V remote modulation.
2. e boiler comes on at 0.9VDC and turns o at 0.6VDC.
1VDC = 10% input. 10VDC = 100% input. ese voltage
settings are adjustable.
ECO Tec Control —
Overview (cont.)

Part number 550-100-272/1021 – 7 –
ECO®Tec series 2 gas-fired water boiler – advanced manual
Placing multiple boilers
1. Locate multiple boilers with spacings shown in Figure4.
Provide the indicated clearances around boilers for access
and servicing.
If recommended dimensions are not possible,
provide at least the minimum clearances given
in the ECO Tec boiler manual. Also follow local
codes.
2. If boilers are oor-mounted, construct a boiler founda-
tion if boiler room oor is uneven or if there is a danger
of ooding. Size the foundation to allow for clearance and
spacing dimensions shown in Figure4.
3. Provide a minimum 24-inch walkway in front of the boil-
ers to ensure accessibility.
4. Uncrate, assemble and mount boilers according to instruc-
tions in the ECO Tec boiler manual.
5. Provide clearances needed for installation of venting, air
piping, gas piping, expansion tank, primary circulator
and other accessories. Clearances must comply with all
applicable codes.
Manifolded combustion air option
1. Multiple ECO Tec boilers can use a common combustion
air manifold.
a. Provide minimum clearance to adjacent vents and
grade/snow line as shown in Figure5.
b. Provide minimum free area in duct (adjusted for
louver restriction) of 1 square inch per 2,000 Btuh
total boiler input. See below. Also see information in
Boiler Ratings section of boiler manual.
c. If combustion air damper is used, wire to boilers to
prevent operation, except aer damper has opened.
ONLY air piping can be combined. DO NOT
use combined vent piping. Flue gas leakage and
boiler component damage can occur. Failure to
comply could result in severe personal injury,
death or substantial property damage.
2. Calculate required cross sectional area of combined com-
bustion air duct (for area in square inches):
MINIMUM DUCT AREA
= TOTAL MBH INPUT DIVIDED BY 2
3. Example: A multiple boiler system with six (6)
ECO Tec150 boilers has a total input of 6 x 150 = 900
MBH (900,000 Btuh). e required duct cross sectional
area would be:
MINIMUM DUCT AREA
= 900 DIVIDED BY 2
= 450 sq. inches
Figure 4 Side-to-side mounting of multiple ECO Tec boilers
Multiple boiler installations
Figure 5 Manifolded combustion air option

Part number 550-100-272/1021
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ECO®Tec series 2 gas-fired water boiler – advanced manual
Maximum connected load per manifold:
2-inch manifold — 450 MBH
3-inch manifold — 1400 MBH
4-inch manifold — 2900 MBH
Figure 6 Single-sided EZ-Fit Header connection
Figure 7 Double-sided EZ-Fit Header connection
Multiple boiler installations (continued)
Easy-Fit®piping installation
1. Main header and Easy-Fit® Manifold pipe sizing.
a. Size system piping as required for the ow.
b. Install tees on the system piping for Easy-Fit® manifolds
as shown in Figure6 orFigure7. Size manifolds to handle
total connected boiler output as shown.
2. Provide connections in main header for Easy-Fit® manifolds
as close as possible to the midpoint of multiple boilers.
a. Use tees for four or less boilers, as in Figure6.
b. Use either tees (Figure6) or crosses (Figure7) for ve
or more boilers.
3. Manifold placement:
a. To alternate spacing for supply and return lines to boilers,
reverse the short-end and long-end of the manifolds as
shown in Figure6 andFigure7.
b. Return manifold must be on the return side of the main
and supply manifold must be on the supply side of the
main. Drawings in this manual show ow in system main
from right to le. For system owing le to right, reverse
the locations of the manifolds accordingly.
4. Connect from Easy-Fit® manifold branches to boiler supply
and return connections using copper or steel pipe, sized for
the required ow rate.
It is recommended to pipe to boilers such
that the rst boiler connection o the return
manifold is piped to the furthest connection
on the supply manifold from the main header.
See Figure9,page17 and Figure11,page21 for
example.
5. Install an isolation valve on the supply and return of each
boiler as shown in the piping diagrams in this manual. Some
local codes may require the use of individual water level
controls and limits on each boiler because isolation valves
are installed.
6. Install main system air eliminator and primary circulator in
supply piping as shown in piping diagrams. Place expansion
tank on suction side of system circulator as shown.
7. Install system accessories as shown in drawings.
8. Piping recommendation drawings:
a. Figure6 andFigure7 show details of Easy-Fit® manifolds.
b. Figure8,page9 is a schematic piping drawing showing
the locations of typical boiler piping and system piping,
including limits and other devices oen required by lo-
cal codes.
c. Figure 8, page 14 and Figure 10, page 18 are three di-
mensional piping drawings of typical multiple boiler
installation.
d. Figure 12, page 22 shows recommend piping when an
isolating heat exchanger is needed.
If desired, other primary/secondary piping arrangements
can be used.

Part number 550-100-272/1021 – 9 –
ECO®Tec series 2 gas-fired water boiler – advanced manual
Legend — Figure 8
1 Flow/check or spring check valve.
2 Isolation valves.
3 Cap.
4 Easy-Fit® Manifold (supply) — layout and size per page8.
5 Easy-Fit® Manifold (return) — layout and size per page8.
6 Primary circulator.
7 Expansion tank (diaphragm type).
8 System air eliminator.
9 System automatic air vent.
10 Pressure reducing valve.
11 Check valve or back ow preventer, as required by applicable codes.
12 Cold water supply.
13 Supply water temperature control (when used).
14 Water ow switch (when used) — locate a ow switch in each boiler
loop if individual protection is required.
15 Boiler circulator (Internal to boiler) not shown.
16 System supply.
17 System return.
18 Boiler P/T gauge, installed per the ECO Tec boiler manual.
19 Strap system supply and return sensors to lines as shown, at least
6 pipe diameters (but no more than 3 feet) from boiler connection
tees.
20 Boiler drain valves.
21 Relief valve and discharge piping, installed per the ECO Tec boiler
manual.
22 Unions (recommended).
Figure 8 Piping schematic — typical piping for multiple ECO Tec boilers, using Weil-McLain Easy-Fit manifolds
(adjust boiler connections as required for other boiler models)
Multiple boiler installations (continued)

Part number 550-100-272/1021
– 10 –
ECO®Tec series 2 gas-fired water boiler – advanced manual
EXPRESS SETUP
ECO Tec control EXPRESS Setup takes advantage of the
control WIZARD to provide the shortest possible method to set
up the control.
Perform the EXPRESS Setup steps on page11 to ensure the
minimum adjustments needed for ADVANCED control operation
are completed.
e remainder of this manual provides detailed information about
control setup and operation available for ne tuning, troubleshoot-
ing and custom setup applications.
Temperature settings — You must ensure
that the ECO Tec control is set for the proper
water temperatures for the system. Exces-
sive water temperature can cause signicant
property damage in some applications.
Multi-temperature systems — If the
heating system includes circuits that require
lower temperature water (radiant slab circuits,
for example) as well as higher temperature
circuits (DHW, nned tube baseboard, etc.),
it is recommended to protect low-temperature
circuits with limit controls that are wired to an
ECO Tec control external limit circuit. Failure
to provide regulation can result in substantial
property damage.
Setup for single boilers
For single boilers not operated as part of a network, follow the
single-boiler setup procedures in the ECO Tec boiler manual.
Using an external multiple boiler controller — Re-
mote modulation using an external controller only
works with each boiler set up as a SINGLE boiler
in the ECO Tec Control setup. Follow instructions
in this manual to setup the control.
Multiple boiler networks
Multiple boiler networks are congured with a MASTER boiler
and one or more SHADOW boilers. (See above for applications
using external controller.)
ye MASTER boiler control regulates the ring of all boilers
when providing heat to the system zones.
ySHADOW boilers respond to heat demand from the master
control except when operating for local (direct-connected)
heat calls.
Priorities
e ECO Tec control allows assigning of multiple priorities. ese
priorities will be given preference in the order below:
ySingle boilers: PRIORITY1, PRIORITY2, PRIORITY3.
yMultiple boilers: LOCAL PRIORITY1, NETWORK PRIOR-
ITY1, NETWORK PRIORITY2, LOCAL PRIORITY2.
If a lower priority is activated a fresh call for heat is sensed, the
boiler will switch immediately to it for Local-1, or activate the
highest rotation order boiler for Network calls. In this case, the
control switches to Network calls from Local-2 immediately, or
aer Max On time has expired from Local-1.
DHW circuit in system — For high-demand DHW
circuits, the control setting for MIN BOILERS must
be set using the NETWORK1 or NETWORK2
priority menu aer the WIZARD is completed to
ensure quick response to demand. See page68 for
a description of the MIN BOILERS setting.
Timings
Timing settings regulate boiler sequencing and ensure minimum
and maximum operating times for heating calls on each system.
Timings can be adjusted during the Wizard setup or manually,
as explained elsewhere in this manual.
Also see page61 for additional information on control timings
and rotation and sequencing methods.
NET MIN ON TIME (multiple boilers only)
yis parameter is available during the Wizard or manually
in the NETWORK SETTINGS menu (Figure30,page60).
yWhen a boiler is being called on by the master boiler to satisfy
a network demand, the boiler will re for at least as long as
the MIN TIME ON NET before it switches to satisfy a Local
Priority if one is active.
yis timing avoids short cycling due to changes in demand.
MIN ON TIME
yis parameter is available during the Wizard or manually
in the PRIORITY SETTINGS menu (Figure35,page65).
yWhen the boiler is being called on to satisfy a higher priority,
the boiler will re for at least as long as the MIN ON TIME
before it switches to satisfy that priority.
yis timing avoids short cycling due to changes in demand.
NET MAX ON TIME (multiple boilers only)
yis parameter is available during the Wizard or manually
in the NETWORK SETTINGS menu (Figure30,page60).
yWhen a boiler is being called on by the master boiler to satisfy
a network demand, the boiler will re for no longer than the
MAX TIME ON NET before it switches to satisfy a Local
Priority if one is active.
yis timing avoids a long-duration call from preventing other
demands from being met for too long a duration.
MAX ON TIME
yis parameter is available during the Wizard or manually
in the PRIORITY SETTINGS menu (Figure35,page65).
yWhen a boiler is being called on by to satisfy a lower priority,
the boiler will re for no longer than the MAX ON TIME
before it switches to satisfy that priority.
yis timing avoids a long-duration call from preventing other
demands from being met for too long a duration.
EXPRESS SETUP — Requirements by Boiler