17
ELECTRICAL WIRING
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.
!
NOTICE
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
Electric Power Supply
Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction. Refer to
National Electrical Code, ANSI/NFPA 70.
Line Voltage Connections
A. Provide individual 120V, 15 amp circuit
(recommended) with fused disconnect or service
switch as required by authority having jurisdiction.
B. Locate a shut-off switch at the boiler.
C. Connect 120V electrical supply to primary leads on
24 volt transformer. Securely fasten with wire nuts.
Thermostat Installation
1.
Install thermostat on inside wall per manufacturer's
instructions.
2.
NEVER install thermostat on outside wall.
3.
Do not install thermostat where it will be affected by
drafts, hot or cold pipes, sunlight, lighting fi xtures,
televisions, fi replace, or chimney.
4.
Check thermostat operation by raising and lowering
thermostat setting as required to start and stop
burners.
5.
Instructions for fi nal adjustment of thermostat see
manufacturer's instructions.
Electronic Thermostats
A. Some electronic thermostats may lose their
memory or shut down. With probe type low water
cutoff, this may occur each time low water cutoff
detects low water condition. If this is the case, an
isolation relay is required for thermostat circuit.
See Figure 17 page 25.
B. Some electronic thermostats are not acceptable
for use with steam systems, check manufacturer
suggested use.
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