Kohler RDT ATS - User Manual

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TT-1646 6/15

INSTALLATION INSTRUCTIONS

Original Issue Date: 6/15

Model: RDT and RXT ATS with Load Management

Market: Residential/Commercial ATS

Subject: Power Relay Module Kit GM92001-KP1-QS

Introduction

The power relay module kit contains one 50 amp relay

with connecting lugs in a NEMA type 3R enclosure. Use

up to four power relay module kits with the following load

management devices:

D RDT automatic transfer switch with load shed kit

GM88281-KA1 or GM88281-KP1-QS

D RXT automatic transfer switch with load shed kit

GM88281-KA1 or GM88281-KP1-QS

D RXT automatic transfer switch with combined

interface/load management board

Note: A load shed kit or RXT combined interface/load

management board is required for load

management. See TT-1609 for the load shed kit

or TP-6807, RXT Operation and Installation

Manual, for load management operation

information.

The power relay modules can be mounted indoors or

outdoors. Mount the modules on a sturdy vertical

surface with the drain holes at the bottom of the module.

Two (2) 120 VAC loads (shed simultaneously) or a

single 240 VAC load can be wired to each relay.

An adequate e lectrical supply is required for operation

of the power relay module. The 120 VAC relays require

a customer-supplied voltage source. Check the

electrical requirements of the customer-provided

equipment prior to installation to determine the wire size

and circuit protection required. Verify that

customer-provided equipment complies with applicable

local and national electrical codes.

Read the entire installation procedure and compare the

kit parts with the parts list at the end of this publication

before beginning installation. Perform the steps in the

order shown.

See Figure 1 for an illustration of the power relay

module.

Equipment Required

D Two to four #8 screws to mount each module

D Drill with 7/8 inch and/or 1 3/8 inch bits or hole saws

D Level

D Power cable for relay source and load connections

(see Specifications below)

D Control cable for relay coil connection (see

Specifications below)

D Conduit

d If the modules are mounted outside, use outdoor-

rated conduit hubs .

d If metal conduit is used, use conduit hubs with

screw terminals for the ground connection.

Figure 1 Power Relay Module

Specifications

Relay Rating 50 A @ 240 VAC

Operating Temperature

--20 to 55_C

(--4 to 131_F)

Storage Temperature

--40 to 85_C

(--40to185_F)

Relay Type DPST -- NC

Coil Voltage 120 VAC

Control Relay Output

Connection (to relay coil)

#6--32 screw

12--18 AWG cable

(ring terminals included)

Connecting Lug Wire Size

(qty. 4, relay source and load

connections)

#4--14 AWG

(Copper only)

Figure 2 Specifications

Main Page

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The Kohler Power Relay Module Kit, model GM92001-KP1-QS, is an accessory designed for use with Kohler RDT and RXT automatic transfer switches (ATS) that incorporate load management capabilities. This kit facilitates the shedding and adding of non-essential electrical loads to optimize generator performance during power outages. It is compatible with RDT ATS models equipped with load shed kits GM88281-KA1 or GM88281-KP1-QS, and RXT ATS models with either the same load shed kits or a combined interface/load management board. Up to four power relay module kits can be integrated into a single load management system.

Function Description:

The primary function of the power relay module is to control the power supply to non-essential loads based on signals from a load management device (either a load shed kit or an RXT combined interface/load management board). The relay operates in a normally closed (NC) configuration, meaning that the connected load is powered when the normal utility source is available. When the transfer switch shifts to the emergency source position and the generator set is supplying power, the load management device sends a signal to the relay. If the relay receives a signal to open, the load is shed (not powered). If it receives a signal to close, the load is reconnected and powered by the generator set. This allows for prioritized load management, ensuring that critical loads remain powered while non-essential loads are shed to prevent generator overload. The load management priorities are determined by how the control relay outputs are connected to the load shed kit or interface/load management board. Typically, Load A is the first to be added and the last to be shed. Each relay module can manage either two 120 VAC loads (shed simultaneously) or a single 240 VAC load.

Important Technical Specifications:

Relay Rating: 50 A @ 240 VAC. This indicates the maximum current and voltage the relay can safely handle for switching loads.
Operating Temperature: -20 to 55°C (-4 to 131°F). This specifies the ambient temperature range within which the module is designed to operate reliably.
Storage Temperature: -40 to 85°C (-40 to 185°F). This defines the temperature range for safe storage of the module when not in operation.
Relay Type: DPST - NC (Double Pole, Single Throw - Normally Closed). This describes the electrical configuration of the relay, indicating it has two independent contacts that are closed in its de-energized state.
Coil Voltage: 120 VAC. This is the voltage required to energize the relay coil and change the state of its contacts.
Control Relay Output Connection (to relay coil): #6-32 screw, 12-18 AWG cable (ring terminals included). This specifies the type of screw terminal and the acceptable wire gauge for connecting the control signals from the load management device to the relay coil.
Connecting Lug Wire Size (qty. 4, relay source and load connections): #4-14 AWG (Copper only). This indicates the range of wire gauges that can be used for the main power connections to the relay, specifically for copper conductors.
Enclosure: NEMA type 3R. This rating signifies that the enclosure is suitable for outdoor use, providing protection against rain, sleet, snow, and external ice formation, and is undamaged by the formation of ice on the enclosure.
Dimensions: The module measures approximately 233 mm (9.2 inches) in height, 172 mm (6.8 inches) in width, and 91 mm (3.6 inches) in depth.
Weight: Approximately 1.36 kg (3 lbs).

Usage Features:

Versatile Mounting: The power relay modules can be mounted both indoors and outdoors. For outdoor installations, outdoor-rated conduit hubs are required. The modules must be mounted on a sturdy vertical surface with the drain holes positioned at the bottom to ensure proper water drainage.
Load Management Integration: Designed to seamlessly integrate with Kohler RDT and RXT ATS systems equipped with load shed kits or combined interface/load management boards.
Flexible Load Control: Each relay can manage either two 120 VAC loads simultaneously or a single 240 VAC load, offering flexibility in managing different types of non-essential circuits.
Prioritized Shedding: Load management priorities are established through the wiring connections to the load shed kit or interface/load management board, allowing users to define which loads are shed first and reconnected last.
Easy Installation: The kit includes all necessary components for installation, such as the relay, enclosure, mounting screws, and terminals. Detailed instructions are provided for wiring connections to the load shed kit or interface board, as well as for source and load connections.
Grounding: The non-conductive resin enclosure requires manual bonding between conduit connections for grounding. Ground leads are connected to a 1/4-20 post within the box.
Safety Precautions: The manual emphasizes critical safety procedures, including disconnecting battery cables and all power sources before installation or maintenance to prevent accidental starting or electrical shock.

Maintenance Features:

Durable Enclosure: The NEMA 3R enclosure provides robust protection for the internal components, minimizing the need for frequent maintenance due to environmental factors.
Component Replacement: The relay is a sub-assembly (GM92005) that can be removed and reinstalled, suggesting potential for individual component replacement if necessary.
Clear Wiring Diagrams: The provided wiring diagrams (Figure 4 and Figure 6) facilitate troubleshooting and ensure correct connections, which can aid in maintenance and repair.
Gasket for Sealing: A gasket (GM92009) is used to seal the enclosure cover, protecting internal components from dust and moisture, thereby reducing the need for cleaning or repair due to environmental ingress.
Access for Wiring: The design allows for cutting openings for cables into and out of the box, facilitating initial wiring and potential rewiring during maintenance.
Debris Protection: Instructions advise covering or removing the relay from the box during installation to protect it from debris, which helps maintain the longevity and functionality of the relay contacts.

Kohler RDT ATS Specifications

General

Brand	Kohler
Model	RDT ATS
Category	Relays
Language	English