Weil-McLain ULTRA299-S4 Manual page 12

S 4
®
ERIES
Install water piping — typical systems
Zoning with zone valves
1. Connect boiler to system as shown in Figure 5 when zone valve
zoning. The primary/secondary piping shown ensures the boiler
loop will have suffi cient fl ow. It also avoids applying the high head
of the boiler circulator to the zone valves. Also see the information
on page 14 and page 15 for suggested piping and sizing.
Use the
on all boiler loop piping (connecting boiler to and from
the primary/secondary connection, item 21).
low these guidelines could result in system problems.
2. When using a closed-type expansion tank, connect the expansion
tank and make-up water piping as shown in Figure 4, page 11 . (DO
NOT use a closed-type tank with a AQUA PLUS water heater.)
3. Connect DHW (domestic hot water) piping to indirect storage
water heater as shown.
By default, the U-Control Module turns off space heating
during DHW heating (if DHW input is priority 1). The
boiler circulator will turn off, preventing hot water from
circulating to the system (optional time out setting can
be used to override). The fl ow/check valve shown on the
boiler outlet piping prevents gravity circulation in the
boiler loop during DHW heating.
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 137 for
compliance information and exemptions.
4. Controlling the circulators
a. The U-Control can control up to three circulators (boiler cir-
culator and two others). Refer to Field wiring, beginning on
page 30 , for instructions on wiring to circulators.
b. The factory default settings are: DHW circulator as Circula-
tor 1, boiler circulator as Circulator 2 and system circulator
as Circulator 3. See Field wiring instructions, beginning on
page 30 , for details.
1 Ultra boiler
2 Indirect water heater (DHW), if used
3 Boiler relief valve (see page 9 for piping details)
4 Relief valve discharge piping (see page 9 for details)
5 DHW circulator (see page 56 for suggested sizing)
6 Isolation valves
7 System circulator (see information above for wiring)
8 Diaphragm (or bladder) type expansion tank (see page 56 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
See page 14 and page 15 and ADVANCED INSTALLATION section for additional piping suggestions.
12
-
GAS FIRED WATER BOILER
pipe size shown in Figure 5
Failure to fol-
Legend — Figure 5
Other piping alternatives
— Boiler Manual
Zone valve zoning plus optional DHW piping
Boiler loop pipe size
Ultra-80, 105
1"
Ultra-155, 230
1¼"
Ultra-299/310,
1½"
399
See CAUTION at left.
12 Boiler circulator
13 Zone valves, typical
20 Make-up water supply
21 Primary/secondary connection
23 DHW connections — see water heater manual for piping
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.
25 Systems using high-head pumps may require a bypass pressure regulator
to prevent damage to control valves.
26 Temperature/Pressure gauge
27 DHW relief valve, if used
Items supplied with boiler
Items supplied by others
Part number 550-100-400/0717