INSTALLING THE
PRIMARY/SECONDARY TEES
The near-boiler piping must be
primary/secondary as shown above
and left, with the boiler loop piping
entering the tees in the branch
connection.
DO NOT connect boiler piping to the
tee through connections as shown
at right. The system will not work
correctly this way.
The circulator supplied with the boiler (
a
) must be
used only in the boiler secondary loop as shown in the
schematic above and in the manual. System (
b
) and zone
circulators and DHW circulator (
c
) must be supplied by
the installer. Above right is a typical installation, showing
the near-boiler piping and connection to the system.
Boiler loop piping must be sized to the minimums
listed in the boiler manual. Using smaller piping will
cause performance problems.
Ultra-80 / Ultra-105
•
. . . . . use 1” or larger
Ultra-155 / Ultra-230
•
. . . . . use 1¼” or larger
Ultra-299 / Ultra-399
•
. . . . . use 1½” or larger
WATER PIPING
(see boiler manual for details)
22
WRONG
RIGHT
DHW
DHW
System
Sensor
Sensor
Gas
System
Typical piping, zone-valve zoning
Do not exceed
12 inches apart
Optional
Easy-Up Manifolds:
1¼”
(W-M #383-500-649)
1½”
(W-M #383-500-661)
Do not e
xceed
12 inches apar
t
b
a
c
a
b
c
