Specifications
Part number 550-100-090/0809
15
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
BASIC INSTALLATION
Using with Weil-McLain PLUS water heaters
(continued)
Ultra boiler with Ultra PLUS or PLUS-40, -60 or -80 water heater, zone valve zoning, typical pipingFigure 9
Ultra boiler with Ultra PLUS or PLUS water heater, typical piping schematicsFigure 10
Legend for Figure 9 and Figure 10
5 DHW circulator (see page 52 for suggested
sizing)
7 System circulator (provided by installer)
8 Diaphragm type expansion tank ONLY
— DO NOT use a closed-type tank with
PLUS water heaters, because the auto-
matic air vent will deplete the air from
the system, causing the expansion tank
to waterlog.
9 Air separator with automatic air vent
10 Flow/check valves
12 Boiler circulator — provided with boiler
13 Zone valves, 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.
23 DHW connections — see water heater
manual for piping
27 Automatic air vent must be installed in
the vent tapping on top of the PLUS water
heater.
Items supplied with boiler
Items supplied by others
12
20
23
23
27
10
10
7
5
9
8
Zone valve zoning
System/zone pipe sizing
(Baseboard, convector or cast iron
radiators ONLY)
For residential space heating appli-
cations (other than radiant heating
or unit heaters) ONLY, you can use:
Ultra Model System header
80
105, 155
230
299, 399
1” or larger
1¼” or larger
1½” or larger
2” or larger
Recommendations are based on a 20°F temp
drop through the system.
Zone piping selection for series loops
with finned-tube baseboard — general
Copper pipe and
baseboard size
Max recommended
feet of baseboard
¾"
1"
106
179
Contact your supplier to size the system and zone
circulators needed. See below for zone piping
using Taco 007 or equivalent circulators.
Limits for series loop zones with
finned-tube baseboard using
Taco 007 (or equivalent) circulators
Copper
pipe and
baseboard
Max
load
MBH
Max feet of
baseboard
Max total
length of
circuit (feet)
¾"
1"
50
79
82
104
93
123
Circulator zoning
Boiler loop pipe size
Ultra-80, 105
Ultra-155, 230
Ultra-299, 399
1” or larger
1¼” or larger
1½ or larger
DHW loop pipe size
See Figure 7, page 14