Electrical Connections; General; Install Room Thermostat - UTICA BOILERS MAHF-125 Installation, Operation & Maintenance Manual

DANGER
!
Electrocution Hazard! HIGH VOLTAGE - Connections
in terminal block M1 are high voltage (120V / 60Hz).
Before making connections, verify appliance is
disconnected from power supply. Respect the input
polarity on terminal block M1: L (LINE) - N (NEUTRAL).
Failure to follow these instructions WILL result in death
or serious injury.
WARNING
!
Electrical shock hazard. Turn OFF electrical power
supply at service panel before making electrical
connections. Failure to do so could result in death or
serious injury.

8.1 General

Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction or in absence of
such requirements refer to:
• USA- National Electrical Code, ANSI/NFPA 70.
• Install all wiring in accordance with requirements of
National Electrical Code and any additional national, state,
or local code requirements having jurisdiction.All wiring
shall be N.E.C. Class 1.
• Boiler shall be electrically grounded in accordance with the
National Electrical Code, ANSI/NFPA No. 70-latest edition.
• Boiler requires a 120V 60Hz power supply. Ensure electrical
supply is polarized.
• There shall only be one common isolator, providing
complete electrical isolation, for boiler and any external
controls. Using PVC insulated cable 12 AWGx3C 221°F
(105 ºC).

8.2 Install Room Thermostat

Install room thermostat on inside wall. Do not install where it
will be influenced by drafts, hot or cold water pipes, lighting
fixtures, television, sun rays or near a fireplace.

8.3 Electrical Connections

• Boiler requires 120V 60Hz power supply. Verify electrical
supply is polarized.
• Boiler shall be grounded and on dedicated circuit.
• Shall be one common isolator, providing electrical isolation
for boiler and any external controls. Using PVC insulated
cable 18 AWGx3C 221°F (105°C).
• All wiring must be installed in accordance with
requirements of the National Electrical Code and any
additional national, state, or local code requirements
having jurisdiction. All wiring must be N.E.C. Class 1.
• Canada, installation must conform to CSA C22.1 Canadian
Electrical Code Part 1 and any local codes.
• If replacing original boiler wiring use only TEW 105°C or
equivalent.
• If appliance is connected to in floor system, install limit
thermostat to prevent latter from overheating.
8 - ELECTRICAL CONNECTIONS
Note
FIGURE 8-2 Junction Box Left side of Boiler
32
Model Size
Power Supply
133 W 142 W
Power Consumption
Internal Fuse (Qty. 2)
Electrode Spark Gap [3.1 mm to 4.7
Wiring diagrams can be found in Appendix A of
this Manual.
Junction Box
with Knockouts
and grommets
240012565 REV A, [05/15/2019]
125 150
120V - 60Hz
F3.15 A
1/8" to 3/16"
mm]