Ultra Boiler Manual

Part number 550-100-440/0122
30
  

See page 94 (Advanced section) for other wiring options
ELECTRICAL SHOCK HAZARD — For your
safety, turn o electrical power supply at service
entrance panel before making any electrical connec
-
tions to avoid possible electric shock hazard. Failure
t
o do so can cause severe personal injury or death.
e installation must comply with: National Electrical
Code and any other national, state, provincial or local
codes or regulations. In Canada, CSA C22.1 Canadian
Electrical Code Part 1, and any local codes.
Wiring must be N.E.C. Class 1. If original wiring
as supplied with boiler must be replaced, use only
type 105 °C wire or equivalent. Boiler must be
electrically grounded as required by National Elec
-
trical Code ANSI/NFPA 70 – latest edition, and/
o
r the Canadian Electrical Code Part I, CSA C22.1,
Electrical Code.
e boiler when installed, must be electrically bonded
to ground in accordance with the requirements of the
authority having jurisdiction or, in the absence of
such requirements, with the National Electrical Code,
ANSI/NFPA 70 – latest edition, and/or the Canadian
Electrical Code Part I, CSA C22.1, Electrical Code.

1. Provide and install a fused disconnect or service switch
(15-ampere rated recommended) as required by applicable
codes.
2. Connect minimum 15-ampere, 120 VAC power wir-
ing to Ultra boiler line voltage terminal strip as shown in
Figure34,page31, and Figure111,page96.

1. e U-Control provides for connection of up to three circula-
tors, one of which must be the boiler circulator. In addition,
you can connect a system circulator and a DHW circulator,
for examples.
The maximum allowable current for each
circulator is 2.2 amps at 120 VAC
. For circula-
tors with higher amp ratings, you must install a
circulator relay or starter to provide line voltage to
the circulator. For circulators rated over 2.2 amps,
connect only the circulator relay or starter coil to
the Ultra circulator terminals.

1. The U-Control provides plug-in, color-coded, non-in-
terchangeable terminal strips for all eld wiring. See the
schematic diagram (Figure111,page96) & ladder diagram
(Figure112,page97).
2. e U-Control provides programmable exibility in system
operation, allowing control of heat supply for up to three dif-
ferent heating systems. Read this manual thoroughly before
connecting the wiring to ensure trouble-free start-up and
operation.

See this and following pages for wiring information. Also
see the Advanced section of this manual for additional wir-
ing connections and options
.
Make the following connections, some of which depend on
your system and how the U-Control will be programmed.

Connect 120VAC power (minimum 15-amp source)

Connect wiring for up to three circulators

Connect thermostats and/or heat demand contacts
• e U-Control can regulate the boiler for up to three dif-
ferent heating systems.

Install system & outdoor sensors, when used
• e boiler is shipped with an outdoor sensor, a system
supply sensor and a system return sensor. e system
supply sensor will be required for most space heating ap-
plications. e system return sensor must also be installed
when using the system supply sensor. Use of the outdoor
sensor is optional.
• Locate the sensors on the system piping as shown in
Figure4,page11 and other piping drawings throughout
this manual.