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Machinc
Machinc, General Contractor
Category: Home Improvement
Satisfied Customers: 839
Experience:  Has written home improvement articles since 2008. Earned South Carolina Residential Builders License in 1991.
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I am installing a FV-11VHL2 and the wiring instructions are

Customer Question

I am installing a FV-11VHL2 and the wiring instructions are not very detailed. I am using a switch Panasonic Model # FV-WCSW41-W. Is there a new version. I have seen lots of complaints on the internet as to how difficult this is to understand.
Submitted: 6 months ago.
Category: Home Improvement
Expert:  Machinc replied 6 months ago.
The heater/ unit you are Installing requures a 20 amp dedicated circuit from your electrical panel
Expert:  Machinc replied 6 months ago.
You would install a 20 amp breaker . It would feed a #12 copper wire cable to the switch
(20 amp) and then to the heater
Expert:  Machinc replied 6 months ago.
This may require running all new wire as most existing wiring in the bathroom us usually 14 gauge.
Expert:  Machinc replied 6 months ago.
This scope of wiring is best done by a professional unless you are familiar with running wire
yourself.
Expert:  Machinc replied 6 months ago.
I will be back in a moment
Expert:  Machinc replied 6 months ago.
Your switch is designed to handle the functions of your heater / light/ nightlight
Expert:  Machinc replied 6 months ago.
You would need a 12 /2 with ground to feed the switch.
Expert:  Machinc replied 6 months ago.
From the switch to the heater you would need a 12/2 with ground. The heater element and heater fan are wired together internally . They would need the black of the 12/2 wired to the switch. The white of the 12/2 would bypass the switch mechanism and would be wired to the common/neutral side of the heater .
Expert:  Machinc replied 6 months ago.
A 14/3 with ground needs to be run from the switch to the unit .
The white wire (neutral) bypasses the switch mechanism and runs straight to the neutral ( not ground)side of the light and circulating fan motor.
Expert:  Machinc replied 6 months ago.
Do not make a mistake and wire the smaller wire #14 to the hester.
Expert:  Machinc replied 6 months ago.
The other two wires in the 14 three run separately to the light and the circulating fan.
Expert:  Machinc replied 6 months ago.
These of course are run to the switches marked for this purpose.
Expert:  Machinc replied 6 months ago.
A 14/2 with ground is needed to
run from the switch to the night light . The white bypsses the switch
Expert:  Machinc replied 6 months ago.
The black runs from the switch to the "hot" side of the night light
Expert:  Machinc replied 6 months ago.
Connect all bare copper grounds to ground.
Expert:  Machinc replied 6 months ago.
NOTE: all of the switches are fed internally by the 12/2 copper wire from the breaker box
Expert:  Machinc replied 6 months ago.
NOTE: the light and nightlight and circulating fan can operate on the smaller #14 wire.
Expert:  Machinc replied 6 months ago.
NOTE : the heater MUST be
wired to the larger #12 wire.
Using the smaller wire on the heater will create a fire hazard
Expert:  Machinc replied 6 months ago.
If this feels beyond your comfort level you should hire a licensed electrician to complete or help you with the installation.
Expert:  Machinc replied 6 months ago.
Materials:
20amp single pole breaket
12/2 with ground ( from panel to
switch.
12/2 with ground from switch to heater
14/3 with ground from switch to light and ventilation fan
14/2 with ground from switch to night light
Expert:  Machinc replied 6 months ago.
NOTE: All wires must be copper
Expert:  Machinc replied 6 months ago.
Note: all neutrals will be conected together in the box where the switch is mounted.
All grounds must be conncted to ground fed on #12 from panel
Expert:  Machinc replied 6 months ago.
NOTE: the reference of running cables to the switch refers to the box the switch is mounted
In and not the actual switch mechanism .
Expert:  Machinc replied 6 months ago.
The hot wires that control the devices wire directly to the controlled side of the switch. The switch mechanism.