55
VIII. 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
Canadian Electrical
Code
Part 1, 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 3 boiler wires (black, white and green)
located in the junction box at top left side of the boiler
jacket.
C. Refer to Figures 26 and 27 for details on the
internal boiler wiring.
Line Voltage (120 VAC) Connections - see Figure 27
.
1. The line voltage connections
are located in the
junction box on the left side of the vestibule. The
terminal block TB-1 in conjunction with terminal
screw identification label is attached to the junction
box combination cover/inside high voltage bracket.
2. The conductor insulation colors are:
a. Black – L1 line voltage “Hot”
b. White – L2 line voltage “Neutral” for boiler and
circulators
c. Red – Line voltage “Hot” for “Heating”
circulator, “System” circulator and “DHW”
circulator
d. Green – Ground connection
Low Voltage (24 VAC) Connections - see Figure 27.
DANGER
Electrical Shock Hazard. 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
Electrical Shock Hazard. 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
This boiler is equipped with a high water temperature limit located inside the internal wiring of the
boiler. This limit provides boiler shutdown in the event the boiler water temperature exceeds the set
point of the limit control. Certain local codes require an additional water temperature limit. In addition,
certain types of systems may operate at temperatures below the minimum set point of the limit
contained in the boiler.
If this occurs, install an additional water temperature limit (Honeywell L4006 Aquastat). Wire as
indicated in the Electrical Section of this manual.
All wire, wire nuts, controls etc. are installer supplied unless otherwise noted.
Summary of Contents for APEX
Page 57: ...57 VIII Electrical continued Figure 26 Ladder Diagram ...
Page 58: ...58 VIII Electrical continued ...
Page 59: ...59 Figure 27 Wiring Connections Diagram VIII Electrical continued ...
Page 105: ...105 ...
Page 109: ...109 XIII Repair Parts continued APX625 APX725 and APX825 APX825 shown ...
Page 112: ...112 XIII Repair Parts continued APX425 and APX525 ...
Page 114: ...114 XIII Repair Parts continued APX625 APX725 and APX825 ...
Page 122: ...122 ...
Page 123: ...123 ...
