Zone Valve Zoning - Primary/Secondary - Weil-McLain Aqua Balance WMB-155 Manual

W
TM
AquaBalance
17 Primary/Secondary System Piping
Zone Valve zoning – primary/secondary
(Shown with optional DHW piping)
See Figure 50.
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 Figure 47, page 38 must pipe the boiler loop as a
secondary circuit as show.
2. Systems zoned with zone valves MUST use a by-pass pressure
regulator.
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
pages 37 or 39.
2. DO NOT use a closed-type tank if connecting to a boiler 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. To provide
DHW priority operation, use a zone controller. See notices
on page 51 to ensure compliance with the 2007 Energy Act.
3. DHW Priority operation—The control turns off space heating
to the HEAT zones during domestic water heating calls on the
DHW input. The MAX ON TIME setting can be adjusted to
limit how long this occurs. Set the MAX ON TIME to "0" to
disable domestic priority. See page 65 for setting instructions.
4. If NOT connecting an indirect water heater, do not use the DHW
input or DHW Circulator output on the control.
Overriding the Outdoor Reset function by connecting
space heating zones to inputs and outputs intended
for DHW applications may violate Section 303 of
the 2007 Energy Act. See page 131 for compliance
information and exemptions.
Wiring the Indirect tank aquastat to the Heating Only
Boilers, refer to Section 21 - Field Wiring.
Controlling the Zones
1. The control can be used to control space heating only, domestic
water heating only, or both. Refer to field wiring, beginning
on page 50, for instructions on wiring to zone valves.
2. The boiler and zone valves can also be operated by a zone
controller.
LEGEND for Figure 50
1 WMB wall mount boiler
2 Indirect Water Heater, if used
3 Relief valve, supplied by Installer, field piped — MUST be
piped to boiler supply connection — see page 9 for infor-
mation
4 DHW Relief valve piping to drain — see page 40
5 DHW circulator
6 Isolation valves
7 System circulator
8 Expansion tank, diaphragm type, if used
9 Air separator
10 Flow/check valves
11 Purge/drain valves
(Installer supplied)
Part number 550-100-305/0118
M -
ALL OUNT GAS FIRED WATER BOILER
.
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 deter-
mine if backflow preventers, pressure reducing valves,
and fill valves may be required
—
Boiler Manual
(continued)
Figure 50 Zone valve zoning — primary/secondary
connection — a system circulator is required
Connect zone valve end switches to HEAT input.
Connect system circulator to HEAT Circ. output.
Use isolation relays if connecting 3-wire zone
valve end switches to the HEAT input.
Note: 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
23 Zone circulator
24 Pressure/temperature gauge, (field supplied), field piped
25 Heating circuits
26 Additional heating circuits, if any
27 Boiler circulator,
Combi boiler the circulator is already inside the boiler
jacket).
28 Mixing valve, if any
Note:
Do not
install
on
Combi
Boil-
ers.
(See Note,
page 42)
Note: This
pump does
not run in
DHW mode
on Heating
Only Boil-
ers.
* (For Heating Only boilers, In the
41