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Circulator zoning with high- and low-
temperature heating zones
Primary/Secondary System piping (continued)
Part number 550-100-260/0520
55
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Circulator zoning – Multiple
temperature zones with primary/
secondary
(Shown with optional DHW piping)
See Figure65.
1. This configuration is for circulator-zoned systems with
high- and low-temperature heating zones using a boiler
loop connected as a secondary circuit off of a primary
system loop. Systems zoned with circulators must pipe
the boiler loop as a secondary circuit as shown.
2. Install a separate circulator (supplied by installer) for
each zone 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.
System setup and settings
1. Hi-temp emitters may be baseboards, radiators, fan coils,
or heat exchangers.
2. Add a mixing device (Figure 65, Item 30) to help ensure
supply water temperature will not exceed the maximum
allowable for the radiant system.
3. Heating zone supply water temperature settings should
be selected for the hi-temp zones. The mixing device
regulates supply temperature to the lower-temp zones.
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. See Field wiring instructions, beginning on page 58, for details.
For Combi models use INPUT2/PRIORITY 2 for the Indirect
DHW systems.
3. For more than 4-zones (Heat only models) or 2-zones (Combi
only models), use an external zone controller.
For Combi models
use INPUT2/PRIORITY 2 for the Indirect DHW systems.
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