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®
SlimFit
Series 3
Install water piping
Circulator zoning –
(Shown with optional DHW piping)
This configuration 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 flow and head as shown.
2. The flow/check valve shown on the boiler outlet piping prevents
gravity circulation in the boiler loop during DHW heating.
Use
Figure 4, page 13 on all boiler loop piping (connecting
boiler to and from the primary/secondary connection,
item 21).
the boiler loop will have sufficient flow. For other piping
methods, see guides on page 13.
Expansion Tank required
1. Provide a system expansion tank following the guidelines on
page 14.
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 configure Boiler Circulator to run during DHW demands and
change TARGET MOD SENSOR to System Supply.
3. Priority of DHW/Space Heating:
a. DHW Priority – DHW is priority over space heating. Use Prior-
ity1 for DHW; Priorities 2 and/or 3 for space heating. The 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. The
control will not run multiple priorities simultaneously.
c. No Priorities – Space heating and DHW can occur
ously. 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. The control can control up to four circulators (boiler circulator
and three others). Refer to Field wiring, beginning on page 50, for
instructions on wiring to circulators. The boiler circulator cannot
be used for a zone pump.
1
SlimFit boiler
2
Indirect water heater (DHW), if used
3
Boiler relief valve (see page 12 for piping details)
4
Relief valve discharge piping (see page 12 for details)
5
DHW circulator)
6
Isolation valves
7
System circulator (see information above for wiring)
8
Diaphragm (or bladder) type expansion tank (see page 14 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
Part number 550-100-168/0516
COMMERCIAL CONDENSING GAS
(continued)
primary/secondary
See Figure 9.
the
pipe size shown in
simultane-
-
FIRED WATER BOILER
Circulator zoning plus optional DHW piping
ensures
2. The factory default settings are: all three inputs are set up
for Space Heating (
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.
Legend — 9
12 Boiler circulator
13
Zone valves, typical
14 Zone circulators, typical
20 Make-up water supply
21 Primary/secondary connection
24 Strap system supply and return sensors to lines as shown, at least 6 pipe
diameters (but no more than 3 feet) from boiler connection tees.
26 Boiler drain valve, ¾" or larger
31 Install a union on the boiler supply and return connections as close as pos-
sible to the boiler to allow disconnection for service when required.
Items supplied with boiler
Items supplied by others
—
Boiler Manual
Priority 2)
. Each input correlates to its
17
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