Install Instructions
30
VI. ELECTRICAL
A. General. Install wiring and electrically ground boiler
in accordance with authority having jurisdiction or, in
the absence of such requirements, follow the National
Electrical Code, NFPA 70, and/or CSA C22.1 Electrical
Code.
B. A separate electrical circuit must be run from
the main electrical service with an over-current
device/disconnect in the circuit. A service switch is
recommended and may be required by some local
jurisdictions. Install the service switch in the line
voltage “Hot” leg of the power supply. Locate the
service switch such that the boiler can be shut-off
without exposing personnel to danger in the event of
an emergency. Connect the main power supply and
ground to the three (3) boiler wires (black, white and
green) located in the junction box at the inside top of
the boiler jacket.
C. INSTALL A ROOM THERMOSTAT on an
inside wall about four feet above oor. Never install
thermostat on an outside wall or where it will be
inuenced by drafts, hot or cold water pipes, lighting
xtures, television, rays of the sun or near a replace.
Keep large furniture away from thermostat so there will
be free movement of room air around this control.
Heat Anticipator in Thermostat should be set to 0.6
amp. If system tends to overheat above the thermostat’s
temperature setting, reduce heat anticipator setting by
.1 or .2 amps. If system tends to short cycle without
reaching desired room temperature, increase heat
anticipator setting by .1 or .2 amps.
D. For zone valve wiring, a separate 24V transformer
is required rather than attempting to use the boiler
mounted control. Consult zone valve manufacturer for
assistance.
WARNING
The combined boiler and circulator amperage
must not exceed 15 amps.
Install over-current protection in accordance with
authority having jurisdiction or, in the absence of
Code, NFPA 70, and/or CSA C22.1 Electrical
Code. Do not provide over-current protection
greater than 15 amperes.
E. Refer to Figures 17 and 18 for details on the internal
boiler wiring.
DANGER
Positively assure all electrical connections are unpowered before attempting installation or service of
electrical components or connections of the boiler or building. Lock out all electrical boxes with padlock
once power is turned off.
WARNING
Failure to properly wire electrical connections to the boiler may result in serious physical harm.
Electrical power may be from more than one source. Make sure all power is off before attempting any
electrical work.
Each boiler must be protected with a properly sized over-current device.
Never jump out or make inoperative any safety or operating controls.
The wiring diagrams contained in this manual are for reference purposes only. Each boiler is shipped with
a wiring diagram attached to the front door. Refer to this diagram and the wiring diagram of any controls
used with the boiler. Read, understand and follow all wiring instructions supplied with the controls.
NOTICE
of the boiler. This limit provides boiler shutdown in the event the boiler water temperature exceeds the set
certain types of systems may operate at temperatures below the minimum set point of the limit contained in
the boiler.
piping as shown in the Water Piping and Trim Section of this manual. Wire as indicated in the Electrical
Section of this manual.