Weil-McLain Ultra 3 series User Manual page 30

-
gas fired water boiler
U-Control operation and setup
For detailed control information
and additional wiring
VANCED INSTALLATION section
of this manual.
Low-temperature systems
diant slab, etc.) —
the Ultra boiler control as the only
means of water temperature regula-
tion for low-temperature systems if
higher-temperature systems are also
supplied.
30
— Boiler Manual
EXPRESS SETUP — using default settings
1. The U-Control is factory programmed to supply a DHW circuit
, see the AD-
(control priority 1) and finned tube baseboard space heating (control
priority 2).
2. Control priority 3 is also available, and preset to run all three circulators
if desired, but requires settings to be configured.
Figure 35
(ra-
Priority
DO NOT
use
1
2
3
3. You can use the factory default settings for most systems supplying
space heating with finned-tube baseboard with or without a DHW
tank, provided:
a.
b.
c.
4. Wiring to use the factory default settings — see information in
ure 32, page 27 for wiring instructions.
(continued)
Factory default settings
Type Target temperature
DHW
Direct
180°F fixed (if no outdoor sensor) or
Finned
180°F at 0°F outside / 130°F at 70°F
tube BB
outside
180°F fixed (if no outdoor sensor) or
Custom 180°F at 0°F outside / 130°F at 70°F
outside
A DHW tank, if used, must be piped directly to the boiler, as in the
piping shown in Figure 5, page 12 or Figure 6, page 13.
If the DHW tank is a separate zone off of the system main, or if it is
piped as in Figure 48, page 48, you will need to enable additional cir-
culators for DHW operation. The U-Control is factory programmed
to operate only the DHW circulator during DHW heating.
The heat emitters in the system must be finned tube baseboard only.
Other heat emitters require changes in the U-Control setup. See
ADVANCED INSTALLATION section for information.
Circulators
enabled
190°F #1 Only
#2 and #3
Part number 550-100-090/0809
None
Fig-