7
Electrical connections
Boiler operating control module
The operating temperature control for the appliance is the
SMART TOUCH control module. It is located on the inside
of the control panel, behind the front access door. Access
to adjust the temperature set point and other user adjustable
points is made through the Operator Interface Smart Touch
display. The outlet sensor is placed in a bulbwell installed in the
outlet side of the heat exchanger top header. The inlet sensor
is located in a bulbwell on the inlet side of the heat exchanger
top header.
The operating sensor, inlet or outlet, is selectable from the
screen in the Operator Interface.
The exact temperature set point is based on your system’s
requirements. Set the control set point(s) to the desired
operating water temperature.
The maximum temperature set point that can be programmed
into the standard control module from the Operator Interface
on a heating boiler is 220°F (104.4°C). The manual reset high
limit control for a heating boiler is adjustable up to a fixed
maximum setting of 230°F (110°C).
The appliance, when installed, must be electrically grounded
in accordance with the requirements of the authority having
jurisdiction or in the absence of such requirements, with the
latest edition of the National Electrical Code ANSI/NFPA No.
70. When the unit is installed in Canada, it must conform to
the CAE C22.1, Canadian Electrical Code, Part I and/or local
Electrical Codes. Multiple units connected in a Cascade must
be grounded to the same ground connection.
1. All wiring between the appliance and field installed devices
shall be made with type T wire [63°F (35°C) rise].
2. All line voltage wire exterior to the appliance must be
enclosed in approved conduit or approved metal clad
cable.
3. The circulating pump must run continuously when the
appliance is being fired.
4. To avoid serious damage, DO NOT energize the appliance
until the system is full of water. Ensure that all air is
removed from the heat exchanger and piping before
beginning initial operation. Serious damage may result if
the appliance is operated without proper flow.
5. Provide the appliance with proper overload protection.
TABLE - 7A
AMP DRAW DATA
Model
Amp Draw
2500
4.9
3000
4.9
3500
6.0
4000
6.0
5000
3.4
ELECTRICAL SHOCK HAZARD – For your
safety, turn off electrical power supply before
making any electrical connections to avoid
possible electric shock hazard. Failure to do
so can cause severe personal injury or death.
Wiring must be N.E.C. Class 1.
If original wiring as supplied with the boiler
must be replaced, use only type 105°C wire
or equivalent.
Boiler must be electrically grounded as
required by National Electrical Code ANSI/
NFPA 70 – latest edition.
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
WARNING
NOTICE
CAUTION
Installation must comply with:
1. National Electrical Code and any other national, state,
provincial, local codes, or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1, and
any local codes.
Line voltage connections
1. Provide and install a fused disconnect or service switch
sized per the boiler amp draw (shown on the boiler rating
plate) as required by the code (see FIG.’s 7-1A and 7-1B on
page 39).
2. When connecting the boiler, system and hot water generator
pumps connect the wiring to the line voltage terminal strip
as shown in FIG.’s 7-1A and 7-1B. Maximum current is
1.5 amps. Install a field supplied contactor between the
pump(s) and the boiler connections.
3. For alternate voltages, consult factory.
38
Installation & Operation Manual
TABLE - 7B
SUPPLY VOLTAGE
Model
Supply Voltage
2500 - 3000
240 VAC 1
3500 - 4000
208 VAC 3
wye
5000
480 VAC 3
wye