
WIRING THE BG-300 SERIES IN A
CONVENTIONAL HVAC SYSTEM
(To ensure proper performance of product, instructions must be followed.)
1. Ensure the power is disconnected to
the unit at the main panel prior to
moving to the next step. Refer to the
appliance manufacturer’s installation
and operating instructions and review
wire layout in their instructions.
2. Locate the Red wire connecting the 24
Volt Transformer on the air handler and
the Thermostat (See Fig 1).
3. Disconnect or cut.
4. Using Wire nuts, connect one of the
wires of the BG-300 series to the cable
going to the 24 VAC transformer on the
air handler.
5. Using Wire nuts, connect the other
wire of the BG-300 series to the red
wire going to the Thermostat. This
conguration results in power to both
air handler and compressor terminating
when switch is tripped.
Note: If only compressor power is to be
terminated, it is acceptable to connect
to the yellow Thermostat wire as
alternate conguration.
The BG-300 series is a normally closed
switch. The switch is compatible with
communicating HVAC systems. Please
refer to your HVAC manufacturer for
wiring instruction in communicating
HVAC systems.
Red 24VAC Supply
Air Handler
Wire Wire
Fig. 1
INSTRUCTIONS