Installation Instructions
229050 (24-volt) and 229051 (120-volt) Current Sensing Relays
Designed to Interface with Most Heating and Cooling Systems
These relays sense current rather than measure voltage, making them more reliable. They are less expensive than using traditional flow
switches, pressure switches or other types of relays. The relay installs around the blower motor’s common lead and interface easily
into the circuitry.
The current sensing relay case is constructed from high-impact plastic. The lead wire bracket is protected by a soft sponge insert, in
order to prevent damage to the motor/blower wire and/or accidental contact with any metal.
Important:
The wire lead bracket needs to carry a minimum of 5.0 amps for proper operation. If the current draw is less than 5.0 amps,
wrap the lead wire around the bracket so that it passes between the bracket and relay housing two or more times.
Caution:
Turn off all power to the furnace motor circuit and cabinet.
229050 and 229051 Current Sensing Relays
General Installation Procedures
1. Follow the step-by-step instructions for
Common
Blower Lead
5 Amp. Min.
L
O
A
D
24 or 120 VAC.
Detail A
Model 229050 Wiring Diagrams (24 Volt)
BRAEBURN MODELS 220700/220750 BRAEBURN MODELS 220500/220550 & 220600/220650
229100 229100
COMMON
Y
LEAD
mounting the humidifier, found in the
humidifier installation manual.
2. Please follow these wiring instructions:
A. Turn off electrical power to the
furnace. Attach the current sensing
relay around the common lead of
the furnace blower motor. The relay
must be located at least 3” from any
transformer. Make sure the relay’s
metal bracket does not touch any
other metal. (See detail A)
B. Confirm the voltage of the switched
load matches the current sensing relay.
C. Wire the current sensing relay as
required for this installation. Refer to
the figures shown below as reference.
For Digital Humidistats, refer to the
Digital Humidistat wiring diagrams.
3. Follow the instructions supplied with the
humidifier to complete the installation.
Y
COMMON
LEAD
120 V
CURRENT
SENSING
D
LEAD
YELLOW
Z
YELLOW LEA
X
RELAY
229050
Fan Powered Humidifier
FURNACE
BLOWER
MOTOR
120 V 24 V
CURRENT
SENSING
Z
X
RELAY
229050
Bypass Humidifier
FURNACE
BLOWER
MOTOR
229050 (24-volt) and 229051 (120-volt) Current Sensing Relays
Model 229051 120 Volt Installation Instructions
Fan Powered Humidifiers and Electronic Air Cleaners
120 VAC
2 x 4
Electrical
Box
1. Install the Indoor Air Quality Accessory according
to the manufacturer’s instructions.
2. Install the 229051 on the common wire of the blower
motor as shown in the diagram .
3. Open the main power junction box on the side of
the furnace and run the leads of the 229051
into the junction box.
4. Connect the leads of the
229051 in series with one
of the Indoor Air Quality
device leads. Connect the
remaining lead and ground
C
A
E
wire. The 120 VAC source
IAQ
DEVICE
must be independent of the
furnace blower motor.
120 VAC
5. Check all wire connections, close junction box
COMMON
CURRENT
SENSING
RELAY
229051
and restore furnace to working order. Test proper
functioning by observing that the air cleaner’s
indicator lamp turns on when the blower runs and
turns off when the blower stops.
LEAD
FURNACE
BLOWER
MOTOR
Checkout Procedures
1. Replace all safety devices.
2. Reconnect power to furnace.
3. Activate furnace blower motor.
4. Check load for operation. It should now be working properly. Check
indicating lamp or other conditions showing that the load is receiving
power.
5. Switch off the blower unit. The power to the device should shut off.
6. If the device is activated properly and turns off when the power
through the common wire is removed, installation is complete.
Technical Specications
24-volt and 120-volt Current Sensing Relay
Voltage Range 21-24 VAC, 50-60 Hz 100-125 VAC, 50-60 Hz
Sensing Current Minimum 5 amps Minimum 5 amps
Operating Ambient Temperature Range 40˚F - 104˚F 40˚F - 104˚F
7. If the device is not powered when the blower is turned on:
• Ensure the device’s power switch is in the “ON” position.
• Recheck all wiring.
• Check line fuses.
• Confirm that five or more amps is flowing through the control wire.
Wrap additional turns around the bracket if necessary.
229050
24-volt Model
229051
120-volt Model
Load Ratings Maximum (12 watts) 0.50 amps
Braeburn Systems LLC
2215 Cornell Avenue • Montgomery, IL 60538
Technical Assistance: www.braeburnonline.com
Call us toll-free: 866-268-5599 (U.S.)
630-844-1968 (Outside the U.S.)
Minimum (3 watts) 0.12 amps
Maximum (130 watts) 1.5 amps
Minimum (3 watts) 0.03 amps
©2009 Braeburn Systems LLC • All Rights Reserved • 22905-100-001
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