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Figure 55
Circulator zoning with high- and low-temperature
heating zones
Primary/Secondary System piping
(continued)
Circulator zoning – Multiple
temperature zones with
primary/
secondary
(Shown with optional DHW piping)
See Figure 55
.
1. This
confi guration 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 fl ow and
head as shown.
Expansion Tank required
1. Provide a system expansion tank following the guidelines
on page 45 or 46 .
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 55
, 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 139 to ensure compliance
with the 2007 Energy Act. See Advanced Manual to
confi gure Boiler Pump to run during DHW demands
and change TARGET MOD SENSOR to System Supply.
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.
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 139 for compliance information and
exemptions.
Controlling the circulators
1. The control can control up to four circulators (boiler
circulator and three others). Refer to Field wiring,
beginning on page 54 , for instructions on wiring to
circulators.
2. The factory default settings are: all three inputs are set
up for Space Heating (
Priority 2)
. 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 54 ,
for details.
3. For more than 3-zones, use Weil-McLain WMZV zone valve
controller.
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.
Part number 550-100-191/0917
51
®
g
as-fired water boiler —
70/110/155
Boiler Manual
Содержание Evergreen EVG 110
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