Figure 18
Pump zoning plus optional DHW piping —
primary/secondary piping
SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler
— Boiler Manual
Part number 550-100-250/0819
21
Legend — Figure 18
1
SVF
TM
boiler
2
Indirect water heater (DHW), if used
3
Boiler relief valve (see page 14 for piping details)
4
Relief valve discharge piping (see page 14 for details)
5 DHW
circulator
6 Isolation
valves
8
Diaphragm (or bladder) type expansion tank (see page 16
for piping of closed-type expansion tank, if used)
9
Air separator [with automatic air vent only on systems using diaphragm
(or bladder) type expansion tank]
10 Flow/check
valves
11 Purge/drain
valves
12 Boiler
circulator
14 Zone pumps, typical
20 Make-up water supply
21 Primary/secondary connection (tees no more than 8 pipe diameters apart)
24 System supply and return immersion sensors, at least 6 pipe diameters (but no
more than 3 feet) from boiler connection tees.
26 External drain/blowdown valve, when used.
33 Strainer,
recommended.
Circulator zoning –
primary/secondary
(Shown with optional DHW piping)
See Figure 18 .
Th
is confi guration is for circulator-zoned systems using a boiler loop
connected as a secondary circuit off of a primary system loop.
1. Install a separate circulator (supplied by installer) for each zone
capable of delivering the proper fl ow and head as shown.
2. Th
e fl ow/check valve shown on the boiler outlet piping prevents
gravity circulation in the boiler loop during DHW heating.
Use
at least
the
-).)-5-
pipe size shown in Figure 11,
page 16
on all boiler loop piping (connecting boiler to and
from the primary/secondary connection, item 21).
0RIMARY
secondary piping shown
ensures the boiler loop will
have suffi
cient fl ow. For other piping methods, see guidelines
starting on page 15 .
Expansion Tank required
1.
Provide a system expansion tank following the guidelines on
page 16 .
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 Advanced
Manual to confi gure Boiler Circulator to run during DHW de-
mands and change TARGET MOD SENSOR to System Supply.
3. System Priority choices:
a. DHW Priority – DHW is priority over space heating. Use
Priority 1 for DHW; Priorities 2 and/or 3 for space heating.
Th
e control will not run multiple priorities simultaneously.
b. Space Heating Priority – Space heating is priority over DHW.
Use Priorities 1 and/or 2 for space heating; Priority 3 for
DHW. Th
e control will not run multiple priorities simulta-
neously.
c. No Priorities – Space heating and DHW can occur simulta-
neously at same Supply Max. temperature. Use only if DHW
is a zone in system. Assign DHW and Space heating to same
Priority. Do not use outdoor reset for this application.
Controlling the circulators
1. Th
e control can control up to four circulators (boiler circulator
and three others). Refer to Field wiring, beginning on page 59 , for
instructions on wiring to circulators. Th
e boiler circulator cannot
be used for a zone pump.
2. Th
e factory default sett ings are: all three inputs are set up for
Space Heating (Priority 2). Each input correlates to its respective
circulator output. For DHW applications, assign DHW inputs to
determined Priority (1, 2 or 3). Priority 1 is defaulted to DHW
for DHW Priority applications.
3. For more than 3-zones, use Weil-McLain WMCR zone Circ.
controller.
Install water piping
(continued)
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