Page 1
Owner's Manual
GenReady™ Load Center and Transfer Switch
This manual should remain with the unit.
0054480
0054510
0054490
0054520
0054530
0054540
0054560
Model Numbers
GenReady Basic Panelboard
GenReady Advanced Panelboard
with Operator
GenReady Basic Panelboard
NEMA 3R
GenReady Advanced Panelboard
with Operator NEMA 3R
Page 2
Safety Rules
SAVE THESE INSTRUCTIONS - This manual contains important instructions that should be followed during
installation and maintenance of the generator and batteries.
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SAVE THESE INSTRUCTIONS! Read the following information carefully before attempting to install, operate
or service this equipment. Also read the instructions and information on tags, decals, and labels that may
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be affixed to the transfer switch. Replace any decal or label that is no longer legible.
DANGER! Connection of a generator to an electrical system normally supplied by an electric utility shall
be by means of suitable transfer equipment so as to isolate the electric system from utility distribution sys-
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tem when the generator is operating (Article 701 Legally Required Standby Systems or Article 702 Optional
Standby Systems, as applicable). Failure to isolate electric system by these means may result in damage to
generator and may result in injury or death to utility workers due to backfeed of electrical energy.
The manufacturer cannot anticipate every possible circumstance
that might involve a hazard. The warnings in this manual, and on
tags and decals affixed to the unit are, therefore, not all-inclusive. If
using a procedure, work method or operating technique the manufacturer does not specifically recommend, ensure that it is safe for
others. Also make sure the procedure, work method or operating
technique chosen does not render the transfer switch unsafe.
Throughout this publication, and on tags and decals affixed to the
generator, DANGER, WARNING, CAUTION and NOTE blocks are
used to alert personnel to special instructions about a particular
operation that may be hazardous if performed incorrectly or carelessly. Observe them carefully. Their definitions are as follows:
After this heading, read instructions that, if not
strictly complied with, will result in serious
personal injury, including death.
After this heading, read instructions that, if not
strictly complied with, could result in serious
personal injury, including death.
After this heading, read instructions that, if not
strictly complied with, might result in minor or
moderate injury.
NOTE:
After this heading, read instructions that, if not strictly complied
with, may result in damage to equipment and/or property.
These safety warnings cannot eliminate the hazards that they
indicate. Common sense and strict compliance with the special
instructions while performing the service are essential to preventing accidents.
Four commonly used safety symbols accompany the DANGER,
WARNING and CAUTION blocks. The type of information each
indicates follows:
This symbol points out important safety information that, if not followed, could endanger
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personal safety and/or property.
This symbol points out potential explosion
hazard.
This symbol points out potential fire hazard.
This symbol points out potential electrical
shock hazard.
GENERAL HAZARDS
Any AC generator that is used for backup power if a NORMAL •
(UTILITY) power source failure occurs, must be isolated from
the NORMAL (UTILITY) power source by means of an approved
transfer switch. Failure to properly isolate the NORMAL and
STANDBY power sources from each other may result in injury
or death to electric utility workers, due to backfeed of electrical
energy.
Improper or unauthorized installation, operation, service or •
repair of the equipment is extremely dangerous and may result
in death, serious personal injury, or damage to equipment and/
or personal property.
Extremely high and dangerous power voltages are present inside •
an installed transfer switch. Any contact with high voltage terminals, contacts or wires will result in extremely hazardous,
and possibly LETHAL, electric shock. DO NOT WORK ON THE
TRANSFER SWITCH UNTIL ALL POWER VOLTAGE SUPPLIES
TO THE SWITCH HAVE BEEN POSITIVELY TURNED OFF.
Competent, qualified personnel should install, operate and ser-•
vice this equipment. Adhere strictly to local, state and national
electrical and building codes. When using this equipment,
comply with regulations the National Electrical Code (NEC),
CSA Standard; C22.1 Canadian Electric Code and Occupational
Safety and Health Administration (OSHA) have established.
Never handle any kind of electrical device while stand-•
ing in water, while barefoot, or while hands or feet are wet.
DANGEROUS ELECTRICAL SHOCK MAY RESULT.
Remove all jewelry (such as rings, watches, bracelets, etc.) •
before working on this equipment.
Page 3
Table of Contents
If work must be done on this equipment while standing on metal •
or concrete, place insulative mats over a dry wood platform.
Work on this equipment only while standing on such insulative
mats.
Never work on this equipment while physically or mentally •
fatigued.
Keep the transfer switch enclosure door closed and bolted at all •
times. Only qualified personnel should be permitted access to
the switch interior.
In case of an accident caused by electric shock, immediately •
shut down the source of electrical power. If this is not possible,
attempt to free the victim from the live conductor but AVOID
DIRECT CONTACT WITH THE VICTIM. Use a nonconducting
implement, such as a dry rope or board, to free the victim from
the live conductor. If the victim is unconscious, apply first aid
and get immediate medical help.
When an automatic transfer switch is installed for a standby •
generator set, the generator engine may crank and start at
any time without warning. To avoid possible injury that might
be caused by such sudden start-ups, the system’s automatic
start circuit must be disabled before working on or around the
generator or transfer switch. Then place a “DO NOT OPERATE”
tag on the transfer switch and on the generator. Remove the
Negative (Neg) or (–) battery cable.
Safety Rules .................................................Inside Front Cover
General Information .................................................................2
Introduction ......................................................................................... 2
Equipment Description ......................................................................... 2
Installation Options ............................................................................... 2
Product Options ................................................................................... 2
GenReady Basic Load Center ...................................................... 2
GenReady Advanced Load Center ............................................... 2
EZ Transfer Operator Fiels Installation Kit ..................................... 3
GenReady Load Center Features ........................................................... 3
Specification ........................................................................................ 3
Load Center ................................................................................ 3
Transfer Switch Mechanism ........................................................ 4
Transfer Switch Data Decal .................................................................. 4
Panelboard Enclosure ........................................................................... 4
Safe Use Of Transfer Switch ................................................................. 4
Installation ............................................................................... 5
Introduction to Installation .................................................................... 5
Unpacking ............................................................................................ 5
Mounting ............................................................................................. 5
Connecting Power Source and Load Lines............................................5
Connecting Control Circuit Wires .......................................................... 6
Operation ................................................................................. 6
Functional Tests & Adjustments ............................................................ 6
Manual Operation ................................................................................. 6
Close to Utility Source Side ......................................................... 6
Close to Generator Source Side ..................................................6
Return to Utility Source Side ....................................................... 6
Voltage Checks .................................................................................... 7
Generator Tests Under Load ................................................................. 7
Electrical Operation .............................................................................. 8
Mounting Dimensions .............................................................. 9
Interconnection Diagrams ...................................................... 10
Notes ..................................................................................... 16
Warranty .................................................................. Back Cover
For authorized service,
reference the dealer locator
number found inside the
generator owner’s manual.
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Page 4
General Information
INTRODUCTION
This manual has been prepared especially for the purpose of familiarizing personnel with the design, application, installation, operation and servicing of the applicable equipment. Read the manual
carefully and comply with all instructions. This will help to prevent
accidents or damage to equipment that might otherwise be caused
by carelessness, incorrect application, or improper procedures.
Every effort has been expended to make sure that the contents
of this manual are both accurate and current. The manufacturer,
however, reserves the right to change, alter or otherwise improve
the product at any time without prior notice.
EQUIPMENT DESCRIPTION
The automatic transfer switch is used for transferring electrical
load from a UTILITY (NORMAL) power source to a GENERATOR
(STANDBY) power source. Such a transfer of electrical loads
occurs automatically when the UTILITY power source has failed or
is substantially reduced and the GENERATOR source voltage and
frequency have reached an acceptable level. The transfer switch
prevents electrical feedback between two different power sources
(such as the UTILITY and GENERATOR sources) and, for that reason, codes require it in all standby electric system installations.
This transfer switch is suitable for use as service entrance equipment.
The GenReady transfer switch is designed to operate in conjunction with an air-cooled or R-panel series (liquid cooled) control
panel used on Generac generators. Utility voltage, automatic
transfer switch operation and sequence delays are controlled by
the control panel on the generator. The AUTO/OFF/MANUAL switch
must be in the AUTO position for automatic operation of the transfer switch mechanism.
Utility voltage is monitored by the control panel. When the Utility
voltage drops below a preset value the generator will start and run.
After a warm up period, the transfer switch mechanism will turn off
the Utility supply and turn on the Generator switch connecting the
customer load to the Generator supply.
The Utility voltage is continuously monitored by the control panel.
When the voltage is above a preset value, the Return to Utility timer
is initiated. When this timer expires, the transfer mechanism will
turn off the Generator switch and turn on the Utility switch connecting the customer load to the Utility supply.
PRODUCT OPTIONS
GENREADY™ BASIC LOAD CENTER
200A Main Circuit Breaker•
125A Circuit Breaker (Lower panel Utility feed).•
125A Lower Panel Circuit Switch•
To make this Load center into a transfer switch mechanism will
require the installation of an EZ Transfer operator. This can be
installed in the field at the time of installation or at a later date.
GENREADY™ ADVANCED LOAD CENTER
200A Main Circuit Breaker•
125A Circuit Breaker (Lower panel Utility feed).•
(2) 125A Lower Panel Circuit Switch•
15A, 2-pole circuit breaker for Utility sensing•
EZ Transfer™ Operator plus field installation kit components.•
INSTALLATION OPTIONS
GenReady Basic GenReady Advanced GenReady Complete
The GenReady load center is installed
without the EZ Transfer operator. It
replaces the home’s main load center.
This option will save the homeowner
thousands in upgrade costs when a
generator is installed.
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The GenReady load center is installed
with the EZ Transfer operator. All
fuel and electrical lines (contractor
supplied) are installed to the planned
generator site along with the generator pad (if required). The home is
completely wired and ready for the
addition of a generator in the future.
Everything included in the GenReady
Advanced level is installed along
with an automatic standby generator.
The home’s selected circuits will be
backed up by generator power whenever the utility is lost.
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General Information
EZ TRANSFER OPERATOR FIELD INSTALLATION KIT
(GENERAC MODEL NO. 05447)
Transfer Operator•
15A, 2-pole circuit breaker for Utility sensing•
125A Lower Panel Generator Circuit Switch•
Hold down bracket.•
Interlock Bar•
Mounting Hardware•
Decals •
Installation Guide•
GENREADY™ LOAD CENTER FEATURES
200 amp main circuit breaker•
40 circuit capacity with the use of tandem breakers•
Dimensions are the same as a standard 42-space main load •
center
Utilizes standard Siemens components•
Split interior design allows for standby back-up power to user •
defined critical circuits.
- Lower, standby protected section has 18 one-inch spaces for
30 circuits
- Upper, utility only section has 10 one-inch spaces for 10
circuits
- An additional two spaces and two circuits are reserved for
generator installation (utility voltage sensing)
Circuits can easily be shifted from protected to non-protected •
and vice versa
UL listed and service entrance rated•
Models available with or without EZ Transfer operator factory •
installed
Single panels are compatible with generators rated up to 125 •
Amps/30 kW
Multiple GenReady load centers can be supported with a single •
generator
Flush Mount NEMA 1 or NEMA 3R enclosure depending on the •
model
Designed for use with Siemens, Generac, Centurion, and •
Guardian standby generators
Neutral and ground bars have multiple 1/0 conductor terminals•
The neutrals and grounds in the generator ready load center are •
NEC and UL Listed to accept multiple ground terminations in
one terminal*
* See the wiring diagram on the panel door for the latest product informa-
tion.
Figure 1 — GenReady Advanced Panelboard
with Operator
SPECIFICATIONS
LOAD CENTER
Enclosure .............................................. NEMA Type 1 or NEMA Type 3R,
general purpose, painted metal
Main Breaker .........................................................................200 Amp
Generator Switch ...................................................................125 Amp
Main breaker wire size ...................................... # 1 to 300 mcm Cu-Al
Generator switch wire size .............................# 2 to 1/0 Cu, 1/0-2/0 Al
Neutral Lug .................................................................# 6 to 300 mcm
Ground Lug ........................................................................... # 14- 2/0
Ground Fault or Arc Fault Circuit Breaker ...............QPF or QAF Siemens
Maximum number of circuits (standard 1" breakers /
tandem 1" breakers)
Protected circuits ......................................................................18/30
Non-protected circuits .............................................................10/NA
Total circuits .............................................................................28/40
Withstand rating Main bus (amps)..............................................22,000
Meets NEC wire bending space ........................................................Yes
UL listed ..........................................................................................Yes
Seismically qualified to meet UBC code ............................................Yes
Weight – GenReady Basic w/o EZ transfer operator
(GenReady Advanced with EZ transfer operator)..... 45.5 lbs. (49 lbs.)
Operating temperature range ........................................ -20º F to 140º F
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Page 6
General Information
TRANSFER SWITCH MECHANISM
This transfer switch consists of a Utility and a Generator supply
2-pole switch which feeds a common bus (the lower half of the
panelboard). The switches look similar to a circuit breaker but do
not have internal current sensing components. The two switches
are mechanically interlocked so that both sources cannot feed the
common bus at the same time. The operator is a rotary device
that actuates the arms that push on the 2-pole switch handles
transferring the customer load from one source to the other. The
operator returns to a neutral position so the arms move freely and
the switches can be operated by hand for a manual transfer.
This transfer switch is used with a single-phase system, when the
single-phase NEUTRAL line is to be connected to a Neutral Lug and
is not to be switched (Figure 1).
Solderless, screw-type terminal lugs are standard.
This transfer switch is suitable for control of motors, electric discharge lamps, tungsten filament and electric heating equipment
where the sum of motor full load ampere ratings and the ampere
ratings of other loads do not exceed the ampere rating of the
switch and the tungsten load does not exceed 30 percent of the
switch rating.
This transfer switch is for use in optional standby systems only
(NEC article 702).
TRANSFER SWITCH DATA DECAL
A DATA DECAL is permanently affixed to the transfer switch enclosure (Figure 2). Use this transfer switch only with the specific
limits shown on the DATA DECAL and on other decals and labels
that may be affixed to the switch. This will prevent damage to
equipment and property.
When requesting information or ordering parts for this equipment,
make sure to include all information from the DATA DECAL.
Record the Model and Serial numbers in the space provided below
for future reference.
Figure 2 — Data Decal
PANELBOARD DATA
ASSEMBLY NUMBER
MODEL NUMBER
SERIAL NUMBER
GENERAC POWER SYSTEMS, INC.
WHITEWATER, WI
Figure 2 — Transfer Mechanism
PANELBOARD ENCLOSURE
The standard switch enclosure is a National Electrical Manufacturer’s
Association (NEMA) type 1 or type 3R depending on the model.
SAFE USE OF TRANSFER SWITCH
Before installing, operating or servicing this equipment, read the
SAFETY RULES (inside front cover) carefully. Comply strictly
with all SAFETY RULES to prevent accidents and/or damage to
the equipment. The manufacturer recommends that a copy of the
SAFETY RULES are posted near the transfer switch. Also, be sure
to read all instructions and information found on tags, labels and
decals affixed to the equipment.
The publications that outline the safe use of transfer switches are
the following:
NFPA 70; National Electrical Code•
NFPA 70E; Standard for Electrical Safety in the Workplace•
UL 1008, Standard for Safety - Automatic Transfer Switches•
UL 67, Standard for Safety - Panelboard•
NOTE:
It is essential to use the latest version of any standard to ensure
correct and current information.
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Page 7
Installation
INTRODUCTION TO INSTALLATION
This equipment has been wired and tested at the factory. Installing
the switch includes the following procedures:
Mounting the enclosure.•
Connecting power source and load leads.•
Connecting the generator sensing and transfer relay circuits.•
Testing functions; manual and electrical operations.•
UNPACKING
Carefully unpack the load center/transfer switch. Inspect closely
for any damage that might have occurred during shipment.
Check that all packing material is completely removed from the
switch prior to installation.
MOUNTING
Mounting dimensions for the transfer switch enclosure are in
this manual. Enclosures are typically wall-mounted. See the
“Installation Diagram”.
Handle load centers carefully when installing.
Do not drop. Protect the load center against
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impact at all times, and against construction
grit and metal chips. Never install a load center
that has been damaged.
This load center is mounted in a NEMA 1 or NEMA 3R enclosure.
It can be mounted outside (NEMA 3R) or inside (NEMA 1 or 3R)
and should be based on the layout of installation, convenience and
proximity to the utility supply and electrical loads.
Install the transfer switch as close as possible to the electrical
loads that are to be connected to it. Mount the switch vertically to
a rigid supporting structure. To prevent switch distortion, level all
mounting points. If necessary, use washers behind mounting holes
to level the unit.
NOTE:
It is accepatable to mount the load center with the 200A Service
Disconnect circuit breaker at the bottom of the load center. It
will be necessary to reverse all reference positional callouts in
this manual (left-right and top-bottom).
CONNECTING POWER SOURCE AND LOAD LINES
Make sure to turn OFF both the UTILITY
(NORMAL) and GENERATOR (STANDBY)
power supplies before trying to connect power
source and load lines to the transfer switch.
Supply voltages are extremely high and dangerous. Contact with such high voltage power
supply lines causes extremely hazardous, possibly lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this
manual.
NOTE:
All installations must comply with national, state and local
codes. It is the responsibility of the installer to perform an
installation that will pass the final electrical inspection.
The utility supply connection is made at the UTILITY SERVICE DISCONNECT circuit breaker terminals. The generator supply connection is made at the GENERATOR DISCONNECT switch terminals.
The customer load connections are made at the individual 1 or
2-pole circuit breakers, inside the switch enclosure.
Conductor sizes must be adequate to handle the maximum current
to which they will be subjected to, based on the 75°C column of
tables, charts, etc. used to size conductors. The installation must
comply fully with all applicable codes, standards and regulations.
Before connecting wiring cables to terminals, remove any surface
oxides from the cable ends with a wire brush. All power cables
must enter the enclosure through the knockouts. If not using the
knockouts, entry must be at or below knockouts. If ALUMINUM
conductors are used, apply corrosion inhibitor to conductors.
Tighten terminal lugs to the torque values as noted on the decal
located on the inside of the door. After tightening terminal lugs,
carefully wipe away any excess corrosion inhibitor.
Use a torque wrench to tighten the conductors, being sure not to overtighten, or damage
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to the insulating base could occur. If not tightened enough, a loose connection would result,
causing excess heat which could damage the
switch base.
Connect power source load conductors to clearly marked transfer
mechanism terminal lugs as follows
1. Connect UTILITY (NORMAL) power source cables to UTILITY
SERVICE DISCONNECT circuit breaker.
2. Connect GENERATOR (STANDBY) source power cables to
GENERATOR DISCONNECT switch.
3. Connect customer LOAD leads to 1 or 2-pole circuit break-
ers.
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Operation
Conductors must be properly supported, of approved insulative
qualities, protected by approved conduit, and of the correct wire
gauge size in accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal
parts and grounded metal. Allow at least 1/2 inch for 100-400
amp circuits.
CONNECTING CONTROL CIRCUIT WIRES
Control system interconnections between the load center ATS and
the generator consist of Utility voltage sensing (wire nos. N1 and
N2) and ATS operating control wires (nos. 23, 15B or 194 and 0).
Connect wire nos. N1 and N2 to the 15A, 2-pole circuit breaker
provided and mounted in the top load center. Connect wire nos. 23,
15B or 194 and 0 to transfer switch operator. The transfer switch
operator requires a 5A maximum fused 12 Vdc supply for operation. When used with non-2008 and later model generators, it will
be necessary install a 5A fuse (supplied) in the +12 Vdc supply
line before it leaves the generator control panel.
Control circuit wires must be run in a separate conduit. The exception to this requirement is if the length is 30 feet or less, then the
control and power wires can be run in the same conduit.
All control wiring to be a minimum 300Vac rating and #14 AWG
size. Type THHN wire is recommended.
Consult drawing no. 0G4744 at the back of this manual for further
details.
FUNCTIONAL TESTS AND ADJUSTMENTS
Following transfer switch installation and interconnection,
inspect the entire installation carefully. A competent, qualified
electrician should inspect it. The installation should comply
strictly with all applicable codes, standards, and regulations.
When absolutely certain the installation is proper and correct,
complete a functional test of the system.
Perform functional tests in the exact order
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presented in this manual, or damage could be
done to the switch.
IMPORTANT: Before proceeding with functional tests, read and
make sure all instructions and information in this section are
understood. Also read the information and instructions of labels
and decals affixed to the switch. Note any options or accessories
that might be installed and review their operation.
MANUAL OPERATION
This transfer switch is suitable for manual transfer under load
providing the dead front cover is in place.
Manual operation must be checked BEFORE the transfer switch
is operated electrically. To check manual operation, proceed as
follows:
1. Turn the generator’s AUTO/OFF/MANUAL switch to OFF.
2. Turn OFF both UTILITY (service disconnect breaker) and the
main line circuit breaker on the generator.
3. Note position of the 2 switches below the transfer switch
operator.
• Utility supply switch (left side) ON and Generator supply
switch (right side) OFF – LOAD terminals are connected to the
Utility.
• Utility supply switch (left side) OFF and Generator supply
switch (right side) ON – LOAD terminals are connected to the
Generator.
CLOSE TO UTILITY SOURCE SIDE
Before proceeding, verify the position of the transfer mechanism
by observing the position of 125A, 2-pole switches.
If the Utility Supply switch (left side) is ON, no further action is
required.
If not, move the Utility Supply switch handle to the ON position.
Note: the Generator Supply switch handle should move to the OFF
position.
The customer load is now connected to the Utility supply.
CLOSE TO GENERATOR SOURCE SIDE
Before proceeding, verify the position of the transfer mechanism
by observing the position of 125A, 2-pole switches.
If the Generator Supply switch (right side) is ON, no further action
is required.
If not, move the Generator Supply switch handle to the ON position. Note: the Utility Supply switch handle should move to the OFF
position.
The customer load is now connected to the Generator supply.
RETURN TO UTILITY SOURCE SIDE
Move the Utility Supply switch handle to the ON position. Note: the
Generator Supply switch handle should move to the OFF position.
The customer load is now connected to the Utility supply.
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Operation
VOLTAGE CHECKS
1. Turn ON the UTILITY power supply to the transfer switch
using the UTILITY service disconnect and 125A, 2-pole circuit
breaker for lower panel feed circuit breaker.
PROCEED WITH CAUTION. THE TRANSFER
SWITCH IS NOW ELECTRICALLY HOT.
CONTACT WITH LIVE TERMINALS RESULTS
IN EXTREMELY HAZARDOUS AND POSSIBLY
FATAL ELECTRICAL SHOCK.
2. With an accurate AC voltmeter, check for correct voltage.
Measure across the terminals of the UTILITY voltage sensing
circuit breaker. Also check UTILITY voltage sensing terminals
to NEUTRAL.
3. When certain that UTILITY supply voltage is correct and compatible with transfer switch ratings, turn OFF the UTILITY supply to
the transfer switch.
4. On the generator panel, set the AUTO/OFF/MANUAL switch to
MANUAL position. The generator should crank and start.
5. Let the generator stabilize and warm up at no-load for at least
five minutes.
6. Turn the GENERATOR DISCONNECT SWITCH to the ON position.
7. Set the generator's main circuit breaker (CB1) to its ON or
CLOSED position.
PROCEED WITH CAUTION. GENERATOR
OUTPUT VOLTAGE IS NOW BEING DELIVERED
TO TRANSFER SWITCH TERMINALS.
CONTACT WITH LIVE TERMINALS RESULTS
IN EXTREMELY DANGEROUS AND POSSIBLY
FATAL ELECTRICAL SHOCK.
8. With an accurate AC voltmeter and frequency meter, check the
no-load, voltage and frequency.
Measure across GENERATOR SUPPLY SWITCH terminals.
Also check each switch terminal to NEUTRAL.
a. Frequency ..............................................................60-62 Hertz
b. Generator Supply Switch Terminals ..................... 240-246 VAC
c. Generator Supply Switch Terminals to Neutral ..... 120-123 VAC
9. Set the generator’s main circuit breaker (CB1) to its OFF or
OPEN position.
10. Set the AUTO/OFF/MANUAL switch to the OFF position to shut
down the generator.
NOTE:
Do NOT proceed until generator AC output voltage and frequency are correct and within stated limits. If the no-load voltage is correct but no-load frequency is incorrect, the engine
governed speed may require adjustment. If no-load frequency
is correct but voltage is not, the voltage regulator may require
adjustment.
GENERATOR TESTS UNDER LOAD
The load center dead front must be installed
before proceeding with Generator Tests Under
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Load. This is necessary for proper operation of
the mechancal interlock.
1. Set the generator's main circuit breaker to its OFF or OPEN
position.
2. Set the 125A LOWER PANEL FEED circuit breaker to the OFF
position.
3. Manually actuate the transfer mechanism main contacts to
their GENERATOR (STANDBY) position. Refer to the Manual
Operation section.
4. To star t the generator, set the AUTO/OFF/ MANUAL switch to
MANUAL. When engine starts, let it stabilize for a few minutes.
5. Turn the GENERATOR SUPPLY SWITCH to the ON position.
6. Turn the generator's main circuit breaker to its ON or CLOSED
position. The generator now powers all LOAD circuits. Check
generator operation under load as follows:
• Turn ON electrical loads to the full rated wattage/amperage capacity of the generator. DO NOT OVERLOAD.
• With maximum rated load applied, check voltage and
frequency at a 120 VAC outlet. Voltage should be greater
than 115 VAC and frequency should be greater than 59
Hertz.
• Let the generator run under rated load for at least 30 minutes. With unit running, listen for unusual noises, vibration, overheating, etc., that might indicate a problem.
7. When checkout under load is complete, set main circuit
breaker of the generator to its OFF or OPEN position.
8. Let the generator run at no-load for several minutes. Then,
shut down by setting the AUTO/OFF/MANUAL switch to its
OFF position.
9. Turn the GENERATOR DISCONNECT circuit breaker to the ON
position.
10. Move the transfer mechanism main contacts back to their
UTILITY position. Refer to the Manual Operation section.
11. Turn on the utility power supply to transfer mechanism, using
the 125A LOWER PANEL FEED circuit breaker. The utility
power source now powers the loads.
12. Set the generator's AUTO/OFF/MANUAL switch to its AUTO
position. The system is now set for fully automatic operation.
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Page 10
Operation
ELECTRICAL OPERATION
Test transfer mechanism electrical operation as follows:
1. Verify the Utility Service Disconnect (200A) and the 125A
Utility lower panel feed circuit breakers are in the ON position.
2. Verify the transfer mechanism is in the Utility position. If not,
refer to the Manual operation section and move it to the Utility
position.
3. Refer to the appropriate owner’s manual. Be sure the standby
generator is prepared for automatic operation.
4. Turn the Utility Service Disconnect circuit breaker to the OFF
position. Verify generator starts after the line interrupt delay
and runs.
5. Verify the transfer mechanism rotates and turns the Utility
Supply switch to the OFF position and the Generator Supply
switch to the ON position.
6. Turn the Utility Service Disconnect circuit breaker to the ON
position. After the Return to Utility time delay, verify the transfer mechanism rotates and turns the Generator Supply switch
to the OFF position and the Utility Supply switch to the ON
position. Generator will run during the Engine Cool down timer
and turn OFF.
If the mechanism functioned as indicated above the system is
operating properly and is ready for automatic operation.
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Page 11
Enclosure Mounting Dimensions
9
Page 12
Interconnection Diagrams Drawing No. 0G4744-G
10
Page 13
Drawing No. 0G4744-G Interconnection Diagrams
11
Page 14
Interconnection Diagrams Drawing No. 0G4744-G
12
Page 15
Drawing No. 0G4744-G Interconnection Diagrams
13
Page 16
Interconnection Diagrams Drawing No. 0G4744-G
14
Page 17
Drawing No. 0G4744-G Interconnection Diagrams
15
Page 18
Notes
16 16
Page 19
Notes
17 17
Page 20
Warranty
GENERAC POWER SYSTEMS, INC. WARRANTY/SERVICE
Generac Power Systems, Inc. will warrant that from the date of purchase, our transfer switch will be free from
defects in material and workmanship for the items and periods set forth in the warranty statement found in the
owners manual of the Generac Power Systems Inc. generator that this transfer switch will be utilized with.
Any equipment that the purchaser/owner claims to be defective must be examined by the nearest Generac
Authorized Warranty Service Dealer by visiting our website at www.generac.com or by calling the dealer locator
number at 1-800-333-1322. Select the prompt that describes the brand name of the generator.
THIS WARRANTY IS IN PLACE OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, SPECIFICALLY,
GENERAC MAKES NO OTHER WARRANTIES AS TO THE MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE.
Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply
to you.
GENERAC’S ONLY LIABILITY SHALL BE THE REPAIR OR REPLACEMENT OF PART(S) AS STATED ABOVE. IN
NO EVENT SHALL GENERAC POWER SYSTEMS, INC. BE LIABLE FOR ANY INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, EVEN IF SUCH DAMAGES ARE A DIRECT RESULT OF GENERAC’S NEGLIGENCE.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limita-
tions may not apply to you.
This warranty gives you specific legal rights. You also may have other rights that vary from state to state.
GENERAC® POWER SYSTEMS, INC.
P.O. BOX 297 • WHITEWATER, WI 53190
Part No. 0G4739 Revision B (11/24/10) Printed in U.S.A.
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