63
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 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.
Refer to
Figures 43 and 44 or details on the internal
boiler wiring.
Line Voltage (120 VAC) Connections - see Figure 44.
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
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
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.
nOTiCE
all wire, wire nuts, controls etc. are installer supplied unless otherwise noted.
Summary of Contents for Apex APX399
Page 65: ...65 VIII Electrical continued Figure 43 Ladder Diagram ...
Page 66: ...66 VIII Electrical continued ...
Page 67: ...67 Figure 44 Wiring Connections Diagram VIII Electrical continued ...
Page 110: ...110 1P 3 1P 2 1P 1 XIII Repair Parts continued 1C 1D 1E ...
Page 116: ...116 XIII Repair Parts continued ...
Page 118: ...118 XIII Repair Parts continued ...
Page 129: ...129 SERVICE RECORD DATE SERVICE PERFORMED ...
Page 130: ...130 SERVICE RECORD DATE SERVICE PERFORMED ...
