INSTALLATION AND OPERATION INSTRUCTIONS
1-34
SFC BOILER / WATER HEATERS - SFC 199
1.9 ELECTRICAL CONNECTIONS
Electrical wiring to the unit (including grounding) must conform to local electrical
codes and/or National Electrical Code, ANS/NFPA No. 70 – latest edition, or The
Canadian Electrical Code, C22.1 - Part 1.
If using an external electrical source, the unit, when installed, must be
electrically bonded to ground in accordance with the requirements of the
authority having jurisdiction or, in the absence of such requirements, with the
National Electrical Code, ANSI/NFPA 70, and/or the Canadian Electrical Code
Part I, CSA C22.1, Electrical Code.
1.9.1 120VAC Line Voltage Hook-up
(Refer to Section 6.2.Wiring Diagram on page 6-5).
Connect the unit to the grid
power, using the supplied appliance plug in a separate, fused circuit and on/off
switch within sight of the unit.
The unit is equipped with 3 x 1/2" electrical knock-outs for control wiring located
behind the power supply terminal strip.
The SFC series units include a factory installed and pre-wired pump. The pump
may not be able to supply adequate flow for the heat emitter circuits. A system
heating pump switched through a separate relay or control box may be needed.
Field Wiring Junction box
The unit ships with an optional field-wiring junction box. This box provides
wiring connections for a space-heating pump, a DHW pump, and an outlet for
unit power. A certified harness from the wiring box connects to the movable
controller tray. You do not require a junction box if: 1. external pumps do not
need to be controlled for space heating, and 2. there are no DHW indirect or
storage tanks.
Figure 36: Junction box schematic
WARNING
Do not apply power to any
connection point on the
controllers terminal strips.
A hazardous situation could
occur resulting in possible
serious injury or death.
Figure 35: Junction Box
Figure 34: Pullling out the tray
