Electrical Connections; Line Voltage Connections; External Connections - Dunkirk HELIX VX-399 Installation, Operation & Maintenance Manual

8.1 General
Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction. Refer to:
• USA- National Electrical Code, ANSI/NFPA 70.
• Canada - Canadian Electrical Code, Part I, CSA C22.1:
Safety Standard for Electrical Installations.
8.2 Line Voltage Connections (figure 8-2)
• Boiler
A. Provide individual 120V, 30 amp circuit
(recommended) with fused disconnect or service
switch as required by authority having jurisdiction.
B. Open High Voltage Junction Box (see figures 3-4
and 3-5) to access line voltage terminal strip.
C. Connect 120 VAC circuit to line voltage terminal
strip 120 VAC L,N,G.
• Central Heating Pump
A. Isolate pump from control module if pump FLA (Full
Load Amps) exceeds 10 amp maximum allowable
current draw. See Figure 8-3 and Table 9.
B. Connect pump to line voltage terminal strip CH
PUMP L,N,G.
• Domestic Hot Water Pump
A. Isolate pump from control module if pump FLA
exceeds 10 amp maximum allowable current draw.
See Figure 8-3 and Table 9.
B. Connect pump to line voltage terminal strip DHW
PUMP L,N,G.
C. PUMP L,N,G.
• GeneralPump
A. Isolate pump from control module if pump FLA
exceeds 10 amp maximum allowable current draw.
See Figure 8-3 Table 9.
B. Connect pump to line voltage terminal strip primary
pump, L, N, G.
8.3 External Connections (figure 8-4)
• User Interface Terminals
A. Factory wired to USER INTERFACE terminals
B. Optional - Remote mount user interface for
improved access. Use low voltage knockout.
C. Maximum wire length is 100 ft (30m) for 22 ga.
wire, or 150 ft (45m) for 18 ga. wire.
• Argus Link (Multiple boiler applications only)
• Outdoor Sensor, if used.
A. Provided with boiler.
B. Locate outdoor sensor to protect against wind and
direct sunlight. Mounting instructions provided with
sensor.
C. Maximum wire length is 100 ft (30m) for 22 ga.
wire, or 150 ft (45m) for 18 ga. wire.
D. Connect wires to OUTDOOR SENSOR terminals.
Wires are interchangeable.

8 - ELECTRICAL CONNECTIONS

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.
Wiring diagrams can be found in Section 14 of this
Manual.
FIGURE
High Voltage
Terminal Box
High Voltage
Knockouts (5)
Low Voltage Knockouts
(Use supplied
grommets when using
these knockouts)
position)
Line Voltage
Terminals
FIGURE
31
!
WARNING
NOTICE
8-1
Electric Knockouts
8-2

Line Voltage Connections

P/N 240010940, Rev. A [10/2015]