Specifications

Part number 550-100-090/0809
49
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
ADVANCED INSTALLATION
Install water piping — advanced (continued)
Legend — Figure 49
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)
6 Isolation valves
8 Diaphragm (or bladder) type expansion tank (see page 52 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
20 Make-up water supply
21 Primary/secondary connection (tees no more than 12 inches apart)
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.
Items supplied with boiler
Items supplied by others
Figure 49 Circulator zoning plus optional DHW piping
Example system with DHW as a zone,
zoning with circulators
Connect boiler to system as shown in 1. Figure 49 when circulator
zoning. The boiler circulator cannot be used for a zone. It must
supply only the boiler loop. Also see the information on page 10
for suggested piping and sizing.
Use at least the MINIMUM pipe size shown in Figure 49
on all boiler loop piping (connecting boiler to and from
the primary/secondary connection, item 21). Use only
primary/secondary piping as shown.
Failure to fol-
low these guidelines could result in system problems.
Install a separate circulator for each zone.2.
DO NOT use a closed-type tank with a PLUS water heater in the 3.
system. The automatic air vent required on the water heater will
deplete air in the system, causing the expansion tank to waterlog.
Use only a diaphragm- or bladder-type tank, suitable for automatic
air vent applications.
In this example, the PLUS 60 DHW tank is piped as a zone in the 4.
system, with piping connections to the tank in accordance with
the PLUS manual.
Wiring to the U-Control5.
Priority 1 = PLUS 60 (zone 1): wire PLUS 60 aquastat terminals a.
to U-Control P11, pins 4 and 5. Wire DHW circulator, A, to
U-Control P2, terminals 1, 4 and 7 (H, N, G).
Wire zone pumps B and C to a two-zone circulator relay.b.
Priority 2 = finned-tube baseboard (zones 2 and 3): wire cir-c.
culator relay end switch 1 to U-Control P15, pins 1 and 2.
Make sure to set Priority 1 to DHW system, not DHW direct.6.
Controlling the system circulator and boiler circulator7.
You will have to set up the U-Control to operate both the boiler a.
circulator and the DHW circulator during DHW operation.
Read the instructions on U-Control operation and setup,
beginning on page 28.
MINIMUM
Boiler loop pipe size
Ultra-80, 105
Ultra-155, 230
Ultra-299, 399
1”
1¼”
1½”
See CAUTION at left.