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Risk of Fire or Electric Shock
• Disconnect power at the circuit breaker(s) or disconnect switch(es) before installing or servicing.
• Installation and service to be performed by a qualied licensed HVAC technician or licensed electrician.
• More than one circuit breaker or disconnect switch may be required to de-energize the equipment
before servicing.
• Installation and/or wiring must be in accordance with national and local electrical code and/or Canadian
Electrical Code requirements.
• For wet location installations, product should be mounted to a raintight enclosure.
• This device features an internal protection that will disconnect the surge protective component, but
will maintain power to the load--now unprotected. If this is undesirable for the application, follow the
manufacturer’s instructions for replacing the device.
• Do NOT mount device nipple side up.
• This product is not designed for rigid conduit mounting.
Installing the Compressor Defender™
A typical installation of the Compressor Defender™ connects to the load side of the electrical service
panel and is intended to be installed with over current protection up to 60 amps to the device. The wire
gauge size should be 10 AWG with a minimum wire length of 6 inches to a maximum of 20 inches from
the nipple out.
NOTE: The Compressor Defender™ does not have to be reset after a surge or brownout event.
1. Disconnect condensing unit power at circuit breaker(s), the AC disconnect, and at the 24 VAC
thermostat circuit.
2. Mount the Compressor Defender™ making sure the 24 VAC wire is mounted below the nipple. See
Figure 1.
NOTE: Ensure conductor lengths are as short and straight as possible for best performance. Do
not coil excess wire. The SPD functions best if all bends in wires are rounded, ideally to
a 4 inch radius. Hard 90º bend will reduce efciency. Cut all leads to the correct length.
NOTE: If you want to install the Compressor Defender™ inside a condensing unit, drill two holes in
the sheet metal and then insert the L clip on the Compressor Defender™ over the holes and
secure the connection with two customer supplied sheet metal screws. See Figure 2.
Model CD1-024R Surge/Brownout/Short Cycle Protective Device
IMPORTANT SAFETY INSTRUCTIONS • THOROUGHLY READ AND SAVE THESE INSTRUCTIONS
The Compressor Defender™ protects HVAC Compressors (Scroll & Reciprocating), and the electronics
inside central air conditioners, heat pumps, light commercial packaged rooftop units, and mini-splits
from under/overvoltage conditions, surge events, and system short cycling caused from AC power
interruptions.
Specs
INSTALLATION INSTRUCTIONS
WARNING
NOTICE
• Input voltage: 120/208-240 VAC, 60 Hz
• MCOV (Max Continuous Overvoltage):
L-N/G: 150 V L-L: 300 V
• Type 3 Outdoor Enclosure
• In (Nominal Discharge Rating) : 20 kA
• SCCR (Short Circuit Current Rating): 100 kA
• T-stat Normally Closed Relay, 24 VAC
• Output Current Rating: 2 A @ 24 VAC
• VPR (Voltage Protection Rating):
L-N/G: 700 L-L:1200
• Type 2 SPD
• Intended for indoor/outdoor use
• Operating Temp: -40º F to 158º F
(-40º C to 70º C)
This unit contains no serviceable parts.
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