Kohler Power Systems Load Shed Kit
Transfer Switch Accessories
Model: Load Shed Kit for RXT/RDT Automatic Transfer Switches
Product Overview
The Kohler Load Shed Kit is an accessory designed to work with Kohler® RXT and RDT automatic transfer switches. It provides intelligent load management capabilities to prevent generator overload, ensure stable power delivery, and allow for the use of smaller generator sets.
Image Description: A visual representation of the Kohler Load Shed Assembly shows a compact electronic module with various connectors and a heat sink, designed for internal mounting within a transfer switch enclosure.
Applicable Models
The Load Shed Kit is compatible with the following Kohler® products:
- RXT Automatic Transfer Switch (without load center)
- RDT Automatic Transfer Switch (without load center)
- RDT 200 amp service entrance rated transfer switch with 42-circuit load center
A Kohler® single-phase generator set equipped with the RDC2 or DC2 controller is required. The load shed kit operates with the following generator set models:
- 14RESA and 14RESAL
- 20RESA and 20RESAL
- 38RCL
- 48RCL
* Information available at time of publication.
Standard Features
- Automatically manages up to six residential loads.
- Includes four customer-provided power relays for management of non-essential secondary loads.
- Includes two HVAC relays to control two independent air conditioner loads.
- Current transformer for load monitoring is provided.
- Mounts inside the enclosure on Kohler® Model RXT and RDT automatic transfer switches.
Load Management
- Disconnects non-critical loads to prevent generator overload, in compliance with NEC 2008.
- Monitors generator current and frequency to determine when to shed loads, preventing frequency drops that can damage sensitive electronics.
- Enables the use of a smaller generator set by managing load demand.
Priority Setting
- Loads are added and shed according to their priority. Load 1 is the highest priority (added first, shed last), and Load 6 is the lowest priority.
- Less critical loads can be automatically turned off when essential appliances are running.
- Load priorities are hard-wired at installation.
Operation
- Loads are automatically added or disconnected based on generator capacity.
- The Kohler-patented load control system uses dynamic logic to prevent shedding important loads unnecessarily when high-demand appliances like air conditioning, refrigerators, or water pumps start.
- The load shed kit and generator communicate to provide smart power management. The time to shed loads decreases as each load is shed to quickly adapt to critical power requirements.
- Load shed power level and frequency setpoint adjustments are possible only by using Kohler® SiteTech™ software, available to Kohler-authorized distributors and dealers.
Specifications
| Connection | Rating | Connection |
|---|---|---|
| Pilot Relays* and HVAC Relays (qty. 2) | 125VAC, 10 A (general purpose) 120VAC, 125VA (pilot duty) | Connect to #6 screw on terminal block |
| RBUS Communication and Power Connections to the RDC2/DC2 controller | 0.5 A @ 12 VDC | Use Belden #9402 or equivalent 20 AWG shielded, twisted-pair communications cable † |
* Four (4) pilot relays are provided for customer-supplied load-switching contactors/relays.
† For long distances, use an equivalent shielded, twisted pair cable for RBUS connections and individual 12-20 AWG wires (qty. 2) for power connections. A communication harness for the Model RXT transfer switch is included with the load shed kit. See TT-1609, Load Shed Kit Installation Instructions, for details.
Current Transformer (CT)
The load shed kit includes a current transformer (CT) for load monitoring. If the application requires cables that are too large for the inner diameter (I.D.) of the CT provided, order current transformer GM17250, or obtain a CT that meets the specifications shown below.
| CT Specifications | GM83929 (provided) | GM17250 * |
|---|---|---|
| Primary Rating | 400 Amps | 400 Amps |
| Secondary Rating | 3 VAC | 3 VAC |
| Burden Resistor | 16 Ohms | 16 Ohms |
| Burden Resistor Location | Internal | Internal |
| Inner Diameter (I.D.) | 28.7 mm (1.13 in.) | 57.2 mm (2.25 in.) |
* Order GM17250 for applications that use larger cables.
Location Inside ATS Enclosure
Diagram Description: An illustration shows the internal components of an Automatic Transfer Switch (ATS) enclosure. A numbered label '1' points to a typical location where the load shed kit is mounted. The diagram notes that the exact location may vary with the transfer switch model and that the enclosure cover is removed for clarity.
Contact and Distribution Information
Kohler Co. Headquarters:
Kohler, Wisconsin 53044 USA
Phone: 920-457-4441
Fax: 920-459-1646
For the nearest sales and service outlet in the US and Canada, phone: 1-800-544-2444
Website: KohlerPower.com
Kohler Power Systems Asia Pacific Headquarters:
7 Jurong Pier Road
Singapore 619159
Phone: (65) 6264-6422
Fax: (65) 6264-6455
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