Ultra Boiler Manual

Part number 550-100-440/0122
63
  
ADVANCED INSTALLATION
Figure 64 Piping layout — typical piping for multiple Ultra boilers, with DHW storage heaters (4-boiler system)
Suggested DHW
boiler-side pipe
sizing
(for max 0.04
feet head loss per foot of
total equivalent length,
TEL)
Flow rate Size Flow rate Size
1 – 3.9 gpm ¾” 24 – 45 gpm 2”
3.9 – 7.1 gpm 1” 45 – 75 gpm 2½”
7.1 – 16 gpm 1¼” 75 - 140 gpm 3”
16 – 24 gpm 1½” 140 – 290 gpm 4”
 (continued)
Legend — Figure 64
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Caps
4 Easy-Fit® Manifold (supply) — layout
and size per page60
5 Easy-Fit® Manifold (return) — layout
and size per page60
6 Primary circulator
7 Expansion tank (diaphragm type)
8 System air eliminator
9 System automatic air vent
13 Cold water supply
17 Boiler circulator (each boiler)
18 System supply
19 System return
20 Boiler relief valve and discharge piping,
installed per Ultra Boiler Manual
21 Indirect-red storage water heaters (Weil-McLain AQUA PLUS shown) — Example
is shown with reverse-return boiler-side piping using a single circulator. Alternate:
each water heater could have its own circulator.
22 Boiler water inlet
23 Boiler water outlet
24 DHW boiler-side circulators
25 DHW boiler-side supply Easy-Fit® Manifold
26 DHW boiler-side return Easy-Fit® Manifold
27 Flow/check valves (to prevent induced or gravity ow in heating system or DHW
piping)
28 Check valve to prevent heat migration in heating system.
29 See water heater manual for DHW piping — e DHW piping must also be manifolded
together since the boiler-side piping is manifolded. If DHW heaters supply separate
DHW circuits, provide an individual circulator for each water heater, and control
each circulator by its water heater’s aquastat.
30
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.
31 Temperature/pressure gauge
This piping is
suggested only.
The layout above should be
controlled with a boiler se-
quencing panel that provides
DHW operation as well. Wire
the heating system circulator to
operate only on call for heat.
Alternatively, use the boiler se-
quencing panel to provide do-
mestic priority by disabling the
heating system circulator any
time there is a DHW call for
heat. e boiler circulators, item
17, must operate on any call for
heat, whether heating system or
DHW. Oset the DHW boiler-
side supply and return mani-
folds as shown so the total run
of pipe and ttings to each of the
water heaters is approximately
equal.
20
31
20
31
20
31
U3158-sp
20
31
1
17
2
Drain
valves
2
2
25
26
29
2
2
17
2
17
2
17
1
22
23
24
21
23
27
24
21
22
23
27
24
21
21
21
3
4
5
6
7
8
9
13
18
19
2
2
2
27
28
2
1
1
2
30
30