Bel-Aire FCS003 120 Vac Current Sensing Switch Interlocking Instruction Manual
- July 20, 2024
- Bel-Aire
Table of Contents
Bel-Aire FCS003 120 Vac Current Sensing Switch Interlocking Instruction
Manual
120 VAC CURRENT SENSING SWITCH INTERLOCKING
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Interlocking yow UV or HEPAunit t:Q quickand’ffih’t:urrentsensing switeft:caniised-f�Qll$
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capadty of 2.5 amp · l:20VAC/ 1.25.amp.@240VAC.,
The current sensing switch works like an amp probe. You simply run the wire you • want to monitor thro:ugh the center of the switch and it senses when there is a load on that wire.
When a load is present the switch closes. If there is no load it opens.
AC OR DC WIRING DIAGRAM
The switch senses AC loads only. The easy place to find a AC load to monitor
is to utilize the wire coming from the blower door safety switch. When the
blower starts up there is a load on that wire. This will work on
furnaces with eitherAC or DC blowers. The minimumamp. This will allow the
switch to ignore the small continuous loadofthe furnace transformer and
controls, making installation on any air handler easy
AC OR DC WIRING DIAGRAM
There is more than one way to sldn a cat!
If the furnace is equipped with an AC blower you can also use the neutral wire from the blower to trip the switch. This type of wiring will only work on AC motors. There are many options and they are all quick and easy.
- Neutral wire to blower motor
- 120 V Power to current switch
- Power to outlet for HEPA/ UV unit. (load)
- Current switch
INSTALLATION INSTRUCTIONS
All wiring must conform to local codes.
- Turn off power to air
- Remove front panels from air
- For units equipped with a OC blower, locate blower door safety Unplug one wire from safety switch and route through the center of the current sensing switch. Plug the wire back into the safety switch. For units equipped with an AC blower, a simpler option is to locate the white neutral wire supplying the blower motor. Unplug the wire, route it through the center of the current sensing switch, then plug it back in. If the wattagefrom a variable speed blower is so low that the switch does not remain closed on lowfan operation, you can loop the wire through the switch a second time to double the amp reading.
- Bring power from the power switch on the side of the air handler to L1 on the current sensing
- Route a wire from Tl on the current sensing switch to your
- Bring both ground and neutral wires from the power switch on the side of the air handler to your
- Secure current sensing relay either with tie wraps or
- Connect the UV or HEPA unit to the outlet and cycle air handler to be sure they turn on and off with the blower. If necessary, you can adjust the sensitivity of the switch by turning the pot on the front of the This will not be necessary most of the time.
- Reinstall front
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