Zone Valve Zoning - Primary/Secondary - Weil-McLain EcoTec 80 Manual

G -
®
ECO Tec
AS FIRED WATER BOILER
Primary/Secondary System Piping
ZONE VALVE zoning –
(Shown with optional DHW piping)
1. This configuration is for zone valve systems using a boiler loop
connected as a secondary circuit off of a primary system loop.
Systems whose flow characteristics do not comply with those
listed in Direct Connect System Piping must pipe the boiler loop
as a secondary circuit as show.
2. Systems zoned with zone valves MUST use a by-pass pressure regulator
(Taco 3196 or equivalent – Item 21) unless using modulating type of
circulator that has protection against dead heading.
3. Install a system circulator (supplied by installer) capable of
delivering the proper flow and head as shown.
Expansion Tank required
1. Provide a system expansion tank following the guidelines on
page 50 or 51.
2. DO NOT use a closed-type tank if connecting to a water heater
that is equipped with an automatic vent.
Domestic Hot Water (DHW) tank, if used
1. DHW direct connection—Pipe from the near-boiler piping to
the DHW tank's boiler connections as shown.
2. DHW as zone— A DHW tank can be connected as a zone if a
DHW tank is NOT already connected to the boiler. See notices on
page 149 to ensure compliance with the 2007 Energy Act. See Control
section in this manual, page 84 to change TARGET MODULATION
SENSOR to System Supply when system sensors are installed.
3. DHW Priority operation— Using Priority 1 for DHW (default)
will turn off lower priorities during DHW calls. The MAX ON
TIME setting can be adjusted to limit how long this occurs.
Use Priority 2 or 3 for DHW if DHW priority is not desired.
For Combi models use INPUT2/PRIORITY 2 for the Indirect
DHW systems.
Overriding the Outdoor Reset function by setting
control to DHW mode when system is intended for
space heating may violate Section 303 of the 2007
Energy Act. See page 149 for compliance information
and exemptions.
Controlling the circulators
1. The Control, for Heat only models, can control up to five
circulators (boiler circulator and four others.) For Combi
models, the control can control up to three circulators (boiler
circulator and two others.) Refer to Field wiring, beginning on
page 58, for instructions on wiring to circulators.
2. The factory default settings are not configured. Each input
correlates to its respective circulator output. For DHW Priority
applications, wire aquastat to Input 1 and assign to Priority 1.
1 ECO Tec boiler
2 Indirect Water Heater, if used
3 Relief valve, supplied with boiler, field piped — MUST be
piped to Boiler In connection — see page 13 for information
4 Relief valve piping to drain — see page 51
5 DHW circulator
6 Isolation valves
7 System circulator
8 Expansion tank, diaphragm type, if used
9 Air separator
10 Spring check valves
11 Purge/drain valves (one drain valve shipped loose with boiler)
Part number 550-100-260/0520
–
80/110/150/199
primary/secondary
See Figure 63.
.
12 Auto air vent
13 Zone valves
14 Primary/secondary connection (tees no more than 12
inches apart)
15 Expansion tank, closed type, if used (some chiller systems
may use a diaphragm-type expansion tank)
16 Water chiller
17 Check valve
18 Y-strainer
19 Balancing valve
20 Make-up water supply – Use applicable codes to determine
if backflow preventers, pressure reducing valves, and fill
valves may be required
B
OILER
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Single Boiler System
Zone valve zoning — primary/secondary
connection — a system circulator is required
See Field wiring instructions, beginning on page 58, for details.
For Combi models use INPUT2/PRIORITY 2 for the Indirect
DHW systems.
3. The boiler and zone valves can also be operated by an external
zone valve controller or an equivalent wiring strategy.
Connect zone valve end switches to Priority 2 input.
Connect system circulator to Circ. 2 output.
Use isolation relays if connecting 3-wire zone valve
end switches to the input.
This is a common legend for all piping diagrams.
Not all Items listed appear in every figure.
21 By-pass pressure regulator, REQUIRED for zone valve
systems unless other provision is made
22 High limit temperature control (If used)
23 DHW tank boiler water supply connection, when used
24 Zone circulator
25 DHW tank boiler water return connection, when used
26 Pressure/temperature gauge, supplied with boiler, field
piped
27 Heating circuits
28 Additional heating circuits, if any
M
ANUAL
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