MODELS SMSK102 • SMSK103
Page 1
WARNING
Broan SmartSense
®
Intelligent Ventilation System
R E A D A N D S AV E T H E S E I N S T R U C T I O N S
PHASE COUPLER INSTALLATION
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PER-
SONS, OBSERVE THE FOLLOWING:
1. Use this unit only in the manner intended by the manufacturer.
If you have questions, contact the manufacturer at the address or
telephone number listed in the warranty.
2. Before servicing or cleaning unit, switch power off at service panel
and lock the service disconnecting means to prevent power from
being switched on accidentally. When the service disconnecting
means cannot be locked, securely fasten a prominent warning de-
vice, such as a tag, to the service panel.
3. Installation work and electrical wiring must be done by a qualified
person(s) in accordance with all applicable codes and standards,
including fire-rated construction codes and standards.
4. Sufficient air is needed for proper combustion and exhausting of
gases through the flue (chimney) of fuel burning equipment to
prevent backdrafting. Follow the heating equipment manufactur-
er’s guideline and safety standards such as those published by the
National Fire Protection Association (NFPA), and the American
Society for Heating, Refrigeration and Air Conditioning Engineers
(ASHRAE), and the local code authorities.
5. When cutting or drilling into wall or ceiling, do not damage electri-
cal wiring and other hidden utilities.
6. This unit must be grounded.
1. At the service entrance, shut off all power to the breaker box. In
some homes, this will be the
MAIN
breaker in the
CIRCUIT BREAKER
PANEL
. If there isn’t a main power shut OFF (master switch) or you
can’t find it do not attempt the work. Call a licensed electrician.
2. Remove the circuit breaker panel cover.
3. Use a circuit tester or AC voltmeter to be sure the circuits are OFF.
Check to make sure that there is no voltage from the screw termi-
nals of several circuit breakers to the ground or neutral bus bar.
4. The
PHASE COUPLER
will need to be wired directly to two circuit
breakers. It is a violation of the electrical code to use an existing
breaker that already has a wire connected to it. Install a new
220V,
15A, DOUBLE-POLE CIRCUIT BREAKER
. These breakers have a bar
between the paddles so that if one breaker detects any overloaded
condition, both will trip.
TIP: If you don’t have any space in your panel for new circuit
breakers, use a quad-pole breaker. You will need to remove two ex-
isting breakers that are adjoining each other. The quad breaker will
need to have two of the poles rated for the amperage as the ones
removed. For example, if you removed two 20-amp breakers, you
would need a 20/15/15/20 quad breaker. The two 15-amp poles
will be for the new phase coupler while the two 20-amp
poles will be for the circuits that were connected to the
old breakers. A home improvement or electrical supply
store should have a good assortment of these.
5. Install a single-gang electrical box for the phase cou-
pler near the breaker box. Use either a metal or plastic
outlet box that complies with local electrical ordinanc-
es.
6. Run electrical cable (minimum 75
0
C rated) between
the circuit breaker panel and the outlet box for the
phase coupler. The cable should be secured with a
clamp or wire nail to the wall stud within a few inches
of the mounting box. Use 14/3 cable, which has three
conductors plus a ground wire.
7. Use wire nuts to connect BLACK to BLACK, RED to
RED, GROUND (bare wire) to GROUND (bare wire).
The WHITE wire is not used. Cap-off both ends of the
WHITE wire with a wire nut.
LINE
Black
NEUTRAL
White
GROUND
Bare
Copper
CIRCUIT BREAKER PANEL
120VAC
BLACK
RED
PHASE
COUPLER
GRD
BLACK
RED
GRD
15
15
To
SWITCHES
and
VENTILATORS
WHITE
GROUND BUS BAR
220V, 15A
DOUBLE-POLE
CIRCUIT BREAKER
MAIN
8. At the circuit breaker box, connect the ground wire to the
GROUND
BUS BAR
. Some panels do not have a separate ground bus bar so
the ground wire must be connected to the neutral bus bar. The
ground wire must be connected for safety purposes.
9. Connect the BLACK wire to one of the 15-Amp circuit breakers.
10. Connect the RED wire to the other 15-Amp breaker.
11. Check to be sure that all the wires are securely fastened, no
copper is exposed (except for the ground wire) and all screws
are tight. You can confirm that the phase coupler is wired to the
correct breakers if you can read 220 to 240 volts AC between
the two breakers when the power is turned on. If there is no
voltage between the two breakers, check to be sure that both of
the breakers and the master breaker are “ON”. If there is still no
voltage between the two breakers, then they are probably on the
same leg, and you will have to select another breaker for one of
the wires.
12. Replace the circuit breaker panel cover.
13. Restore power to the main breaker.
