Generac Power Systems 20 kW Synergy User manual

Owner’s Manual
60 Hz Air-Cooled Generators
20kW Synergy™
SAVE THIS MANUAL FOR FUTURE REFERENCE
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Register your Generac product at:
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1-888-GENERAC
(888-436-3722)
(000209a)
WARNING
This product is not intended to be used in
a critical life support application. Failure to
adhere to this warning could result in
death or serious injury.

ii Owner’s Manual for 60 Hz Synergy™ Generators
Use this page to record important information about your generator set.
Record the information found on your unit data label on this
page. See General Information for the location of the unit
data label. The unit has a label plate affixed to the inside
partition, to the left of the control panel console as shown in
Figure 2-1. See Operation for directions on how to open the
top lid and remove the front panel.
When contacting an Independent Authorized Service Dealer
(IASD) about parts and service, always supply the complete
model and serial numbers of the unit.
Operation and Maintenance: Proper maintenance and care
of the generator ensures a minimum number of problems
and keeps operating expenses at a minimum. It is the
operator’s responsibility to perform all safety checks, to
make sure that all maintenance for safe operation is
performed promptly, and to have the equipment checked
periodically by an IASD. Normal maintenance, service, and
replacement of parts are the responsibility of the owner/
operator and are not considered defects in materials or
workmanship within the terms of the warranty. Individual
operating habits and usage may contribute to the need for
additional maintenance or service.
When the generator requires servicing or repairs, Generac
recommends contacting an Independent Authorized Service
Dealer for assistance. Authorized service technicians are
factory–trained and are capable of handling all service
needs.To locate the nearest Independent Authorized Service
Dealer, please visit the dealer locator at:
www.generac.com/Service/DealerLocator/
Model:
Serial:
Prod Date Week:
Volts:
LPV Amps:
NG Amps:
Hz:
Phase:
Controller P/N:
(000005)
WARNING
California Proposition 65. This product contains or
emits chemicals known to the state of California to
cause cancer, birth defects, and other reproductive
harm.
(000004)
WARNING
California Proposition 65. Engine exhaust and some
of its constituents are known to the state of California
to cause cancer, birth defects, and other reproductive
harm.

Owner’s Manual for 60 Hz Synergy™ Generators iii
Section 1: Safety Rules
Introduction ..........................................................1
Read This Manual Thoroughly ....................................1
Safety Alerts .........................................................1
How to Obtain Service .................................................1
Safety Rules .........................................................2
General Hazards .........................................................2
Exhaust Hazards .........................................................3
Electrical Hazards .......................................................3
Fire Hazards ................................................................4
Explosion Hazards ......................................................4
Section 2: General Information
Synergy Operating Principle ..............................5
Benefits .......................................................................5
Start Up .......................................................................5
Normal Running ..........................................................5
Small Load Changes ...................................................5
Large Load (Not Overload) ..........................................5
Overload ......................................................................5
Low Speed Exercise ....................................................5
Normal Exercise ..........................................................5
Automatic Voltage Regulator (AVR) Cooling Fans ......5
The Generator ......................................................6
Specifications ......................................................7
Generator ....................................................................7
Engine .........................................................................7
Protection Systems .............................................7
Emission Information ..........................................8
Fuel Requirements ..............................................8
Battery Requirements .........................................8
Battery Charger ....................................................8
Engine Oil Requirements ....................................8
Activating the Generator .....................................8
Replacement Parts ..............................................8
Accessories ..........................................................9
Section 3: Operation
Site Prep Verification .........................................10
Generator Enclosure .........................................10
Opening the Lid .........................................................10
Removing the Front Access Panel ............................10
Intake Side Panel Removal .......................................11
Main Line Circuit Breaker (Generator Disconnect) ....12
LED Indicator Lights ..................................................12
Control Panel Interface ..................................... 12
Using the AUTO/OFF/MANUAL Interface ........ 13
Interface Menu Displays ................................... 13
The LCD Panel ..........................................................13
Menu System Navigation ..........................................14
Setting the Exercise Timer ............................... 16
Battery Charger ................................................. 16
Manual Transfer Operation ............................... 16
Transfer to Generator Power Source ........................16
Transfer to Utility Power Source ................................18
Automatic Transfer Operation ......................... 18
Automatic Sequence of Operation .................. 18
Utility Failure ..............................................................18
Cranking ....................................................................18
Cold Smart Start ........................................................18
Load Transfer ............................................................19
Shutting Generator Down While Under Load Or
During An Extended Outage ............................ 19
To turn the generator OFF (while running in AUTO and
online): ......................................................................19
To turn the generator back ON: .................................19
Section 4: Maintenance
Maintenance ....................................................... 23
Performing Scheduled Maintenance ............... 23
Before Servicing ................................................ 23
Maintenance Kits ............................................... 23
Preparing for Maintenance ............................... 24
Service Schedule ............................................... 25
Maintenance Log ............................................... 26
Checking Engine Oil Level ............................... 26
Engine Oil Requirements ..........................................27
Changing the Oil and Oil Filter ......................... 27
Servicing the Air Cleaner .................................. 28
Replacing the AVR Filter .................................. 28
Table of Contents

Table of Contents
iv Owner’s Manual for 60 Hz Synergy™ Generators
Spark Plugs ........................................................28
Valve Clearance Adjustment ............................29
Check Valve Clearance ............................................ 29
Adjust Valve Clearance ............................................. 29
Battery Maintenance ..........................................30
Cleaning the Sediment Trap .............................31
Attention After Submersion ..............................31
Corrosion Protection .........................................32
Remove From, and Return To
Service Procedure .............................................32
Remove From Service .............................................. 32
Return to Service ...................................................... 32
Section 5: Troubleshooting / Quick
Reference Guide
General Troubleshooting ..................................33
Synergy Troubleshooting .................................34
Load Shed Troubleshooting .............................36
Quick Reference Guide .....................................37

Safety Rules
Owner’s Manual for 60 Hz Synergy™ Generators 1
Section 1: Safety Rules
Introduction
Thank you for purchasing this compact, high
performance, air-cooled, engine-driven generator. It is
designed to automatically supply electrical power to
operate critical loads during a utility power failure.
This unit is factory installed in an all-weather, metal
enclosure that is intended exclusively for outdoor
installation. This generator will operate using either vapor
withdrawn liquid propane (LP) or natural gas (NG).
NOTE: This generator is suitable for supplying typical
residential loads such as induction motors (sump pumps,
refrigerators, air conditioners, furnaces, etc.), electronic
components (computer, monitor, TV, etc.), lighting loads,
and microwaves, when sized properly.
The information in this manual is accurate based on
products produced at the time of publication. The
manufacturer reserves the right to make technical
updates, corrections, and product revisions at any time
without notice.
Read This Manual Thoroughly
If any portion of this manual is not understood, contact
the nearest Independent Authorized Service Dealer
(IASD) for starting, operating, and servicing procedures.
This manual must be used in conjunction with the
appropriate installation manual.
SAVE THESE INSTRUCTIONS: The manufacturer
suggests that this manual and the rules for safe operation
be copied and posted near the unit installation site.
Safety should be stressed to all operators and potential
operators of this equipment.
Safety Alerts
Throughout this publication and on tags and decals
affixed to the generator, DANGER, WARNING, and
CAUTION 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:
NOTE: Notes provide additional information important to
a procedure or component.
These safety alerts cannot eliminate the hazards they
indicate. Observing safety precautions and strict compli-
ance with the special instructions while performing the
action or service are essential to preventing accidents.
The operator is responsible for proper and safe use of
the equipment. The manufacturer strongly recommends
that if the operator is also the owner, to read the owner’s
manual and thoroughly understand all instructions before
using this equipment. The manufacturer also strongly
recommends instructing other users to properly start and
operate the unit. This prepares them if they need to
operate the equipment in an emergency.
How to Obtain Service
Contact an IASD for assistance when the generator
requires servicing or repairs. Service technicians are
factory-trained and are capable of handling all service
needs. Please visit the dealer locator at:
www.generac.com/Service/DealerLocator/ to locate
the nearest IASD.
When contacting a dealer about parts and service,
always supply the complete model and serial numbers of
the unit as given on its data plate (decal), which is
located on the generator. See Figure 2-1 for decal
location. Record the model and serial numbers in the
spaces provided on the inside front cover of this manual.
(000100a)
WARNING
Consult Manual. Read and understand manual
completely before using product. Failure to
completely understand manual and product
could result in death or serious injury.
(000001)
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
(000002)
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
(000003)
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.

Safety Rules
2Owner’s Manual for 60 Hz Synergy™ Generators
Safety Rules
Study these SAFETY RULES carefully before installing,
operating, or servicing this equipment. Become familiar
with this owner’s manual and with the unit. The generator
can operate safely, efficiently, and reliably only if it is
properly installed, operated, and maintained. Many
accidents are caused by failing to follow simple and
fundamental rules or precautions.
The manufacturer cannot anticipate every possible
circumstance that might involve a hazard. The alerts in
this manual and on tags and decals affixed to the unit are
not all-inclusive. If using a procedure, work method, or
operating technique the manufacturer does not
specifically recommend, verify that it is safe for others
and does not render the generator unsafe.
General Hazards
(000190)
DANGER
Loss of life. Property damage. Installation must always
comply with applicable codes, standards, laws and
regulations. Failure to do so will result in death
or serious injury.
Automatic start-up. Disconnect utility power and
render unit inoperable before working on unit.
Failure to do so will result in death or serious injury.
(000191)
DANGER
(000209a)
WARNING
This product is not intended to be used in
a critical life support application. Failure to
adhere to this warning could result in
death or serious injury.
WARNING
This unit is not intended for use as a prime power
source. It is intended for use as an intermediate power
supply in the event of temporary power outage only.
See individual unit specifications for required
maintenance and run times pertaining to use. (000247)
(000130)
WARNING
Accidental Start-up. Disconnect the negative battery
cable, then the positive battery cable when working
on unit. Failure to do so could result in death
or serious injury.
(000182)
WARNING
(000187)
WARNING
(000155)
WARNING
Only a trained and licensed electrician should perform
wiring and connections to unit. Failure to follow proper
installation requirements could result in death, serious
injury, and damage to equipment or property.
(000115)
WARNING
Moving Parts. Do not wear jewelry when
starting or operating this product. Wearing
jewelry while starting or operating this product
could result in death or serious injury.
(000111)
WARNING
Moving Parts. Keep clothing, hair, and
appendages away from moving parts. Failure
to do so could result in death or serious injury.
(000108)
WARNING
Hot Surfaces. When operating machine, do not
touch hot surfaces. Keep machine away from
combustibles during use. Hot surfaces
could result in severe burns or fire.
(000146)
WARNING
Equipment and property damage. Do not alter
construction of, installation, or block ventilation for
generator. Failure to do so could result in unsafe
operation or damage to the generator.

Safety Rules
Owner’s Manual for 60 Hz Synergy™ Generators 3
•Inspect the generator regularly, and contact the
nearest IASD for parts needing repair or
replacement.
Exhaust Hazards
•The generator must be installed and operated
outdoors only.
Electrical Hazards
WARNING
Risk of injury. Do not operate or service this
machine if not fully alert. Fatigue can impair the
ability to service this equipment and could result
in death or serious injury. (000215)
WARNING
Environmental Hazard. Always recycle batteries at an
official recycling center in accordance with all local
laws and regulations. Failure to do so could result in
environmental damage, death or serious injury.
(000228)
WARNING
Injury and equipment damage. Do not use
generator as a step. Doing so could result in falling,
damaged parts, unsafe equipment operation,
and could result in death or serious injury. (000216)
Asphyxiation. Running engines produce
carbon monoxide, a colorless, odorless,
poisonous gas. Carbon monoxide, if not
avoided, will result in death or serious injury.
(000103)
DANGER
(000178a)
Asphyxiation. Always use a battery operated carbon
monoxide alarm indoors and installed according to
the manufacturer’s instructions. Failure to do so
could result in death or serious injury.
WARNING
(000146)
WARNING
Equipment and property damage. Do not alter
construction of, installation, or block ventilation for
generator. Failure to do so could result in unsafe
operation or damage to the generator.
(000144)
DANGER
Electrocution. Contact with bare wires,
terminals, and connections while generator
is running will result in death or serious injury.
(000150)
DANGER
Electrocution. Never connect this unit to the electrical
system of any building unless a licensed electrician
has installed an approved transfer switch. Failure to
do so will result in death or serious injury.
(000237)
DANGER
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
(000152)
DANGER
Electrocution. Verify electrical system is
properly grounded before applying power.
Failure to do so will result in death or serious
injury.
(000188)
DANGER
Electrocution. Do not wear jewelry while
working on this equipment. Doing so will
result in death or serious injury.
(000104)
DANGER
Electrocution. Water contact with a power
source, if not avoided, will result in death
or serious injury.
(000145)
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.

Safety Rules
4Owner’s Manual for 60 Hz Synergy™ Generators
Fire Hazards
•Comply with regulations the Occupational Safety
and Health Administration (OSHA) has
established. Also verify that the generator is
installed in accordance with the manufacturer’s
instructions and recommendations. Following
proper installation, do nothing that might alter a
safe installation and render the unit in
noncompliance with the aforementioned codes,
standards, laws, and regulations.
Explosion Hazards
WARNING
Fire hazard. Do not obstruct cooling and
ventilating airflow around the generator. Inadequate
ventilation could result in fire hazard, possible
equipment damage, death or serious injury. (000217)
WARNING
Fire and explosion. Installation must comply
with all local, state, and national electrical
(000218)
building codes. Noncompliance could result in unsafe
operation, equipment damage, death or serious injury.
WARNING
Fire hazard. Use only fully-charged fire
(000219)
extinguishers rated “ABC” by the NFPA. Discharged or
improperly rated fire extinguishers will not extinguish
electrical fires in automatic standby generators.
(000100a)
WARNING
Consult Manual. Read and understand manual
completely before using product. Failure to
completely understand manual and product
could result in death or serious injury.
WARNING
to use required safety equipment could result
in death or serious injury. (000257)
Electrocution. Refer to local codes and
standards for safety equipment required when
working with a live electrical system. Failure
(000147)
WARNING
Risk of Fire. Unit must be positioned in a
manner that prevents combustible material
accumulation underneath. Failure to do so
could result in death or serious injury.
(000192)
DANGER
(000151)
DANGER
Connection of fuel source must be done by a qualified
professional technician or contractor. Incorrect installation
of this unit will result in death, serious injury, and damage
to equipment and property damage.
(000174)
DANGER
Risk of fire. Allow fuel spills to completely dry
before starting engine. Failure to do so will
result in death or serious injury.
(000110)
WARNING
Risk of Fire. Hot surfaces could ignite
combustibles, resulting in fire. Fire could
result in death or serious injury.

General Information
Owner’s Manual for 60 Hz Synergy™ Generators 5
Section 2: General Information
Synergy Operating Principle
Benefits
The Synergy 20 kW generator brings exciting new
technology to the Home Standby Generator. The
generator is significantly more fuel-efficient than constant
speed generators at normal loads, provides premium
power quality, and is significantly quieter while operating
at exercise and normal loads.
•Exceptionally quiet exercise at 57 dB
•Quieter operation; 3 dB sound reduction with
improved tonal qualities at exercise and under
normal loads
•Cleanest Standby power available with 1.5 THD
•Significant fuel savings: more fuel efficient under
normal loads
•Lower operating speed at 2700 rpm at low loads
•Tuned Helmhortz resonator and muffler to further
reduce sound levels
•Variable Speed / Constant Frequency operation
Start Up
When the generator starts, the engine speed increases to
3600 RPM to produce maximum power. This optimizes
power to carry the load when the transfer switch
operates. The engine RPM then gradually decreases to a
speed appropriate for the attached load.
For example: If there is no load, the engine speed
decreases to approximately 2700 RPM. The time it takes
to decrease to 2700 RPM is approximately 4–5 minutes.
Since the rate of decrease is linear, less time would be
required for it to decrease to only 3400 RPM.
During startup, as the engine speed increases to 3600
RPM, the Automatic Voltage Regulator (AVR) electronics
perform a self test (before transfer) involving an overall
system check of the unit. If a fault is detected, the unit
shuts down and displays an alarm.
Normal Running
The engine operates between 2700 RPM–3600 RPM
depending on the attached load. When the load
increases or decreases, the speed increases or
decreases accordingly.
Small Load Changes
The system is designed to maintain the current engine
speed for small load changes. Larger load changes result
in a change in engine speed to appropriately handle the
load.
Large Load (Not Overload)
The engine always runs at a speed appropriate for the
attached load. When a large load is applied, the fast
loadshed signal is activated. All loads attached to the
loadshed controller in the transfer switch are dropped
and the engine speed immediately increases to 3600
RPM. Five seconds later, the loadshed signal is
deactivated, and Loads 3 and 4 are sequenced back on,
spaced 15 seconds apart. Loads 1 and 2, which are
designed for air conditioners, are sequenced back on
after five minutes.
The engine speed remains at 3600 RPM for a
programmable time (20 minutes default) and then slows
to the speed appropriate for the attached load. The
programmable time can be changed by the dealer to
prevent annoying increases and decreases in engine
speed if large loads turn on and off frequently.
Overload
If a load is sensed to be too large for the engine, that load
will be locked out for a period of 30 minutes. If the load is
not connected through a fast loadshed-enabled controller
and module, the generator will shut down with an
“Overload” alarm.
Low Speed Exercise
Low speed exercise operates at 1950 RPM for five
minutes. The output voltage and frequency will not be at
the rated voltage and frequency during exercise.
Normal Exercise
Normal exercise is at 3600 RPM at normal voltage and
frequency levels for 5 minutes.
Automatic Voltage Regulator (AVR) Cooling Fans
The system is equipped with two fans to cool the AVR
electronics. The primary fan is powered by AC during
operation. The secondary fan is powered by 12V DC
through the controller. The fans are monitored during
operation and, if a failure occurs, an alarm is displayed.
The secondary fan continues to operate for up to eighty
minutes after the generator is shut down (even if the 7.5
amp ATO fuse is removed). Proper cooling must occur
before removing battery connections for maintenance or
other service activity to prevent damage. Be extremely
careful when working near the AVR fan housing.
(000111)
WARNING
Moving Parts. Keep clothing, hair, and
appendages away from moving parts. Failure
to do so could result in death or serious injury.

General Information
6Owner’s Manual for 60 Hz Synergy™ Generators
The AVR cooling air inlet includes a filter. Verify the filter
is installed and properly seated at time the unit is
installed.
Check the filter at regular maintenance intervals to verify
proper airflow.
The Generator
Figure 2-1. Components and Control Locations
003589
B
G
H
A
C
D
AE
F
R
Q
P
S
N
OL
KJ
M
A. Lock with Cover F. Oil Dipstick L. Oil Drain Hose Q. Fuel Regulator
B. Main Line Circuit
Breaker (Generator
Disconnect)
G. Exhaust Enclosure M. Composite Base R. Fuel Inlet
C. Control Panel H. Status LED Indicators N. Airbox with Air Cleaner S. AVR Air Filter
D. Battery Compartment
(Battery not supplied)
J. Oil Fill Cap O. Automatic Voltage
Regulator (AVR)
E. Data Plate Location K. Oil Filter P. Sediment Trap

General Information
Owner’s Manual for 60 Hz Synergy™ Generators 7
Specifications
Generator Engine
The specification sheet for your generator was included
in the documentation provided with the unit at the time of
purchase. For additional copies, consult your local
Independent Authorized Service Dealer (IASD) for your
specific generator model.
Protection Systems
The generator may need to run for long periods of time
with no operator present to monitor the engine/generator
conditions. The generator is equipped with protection
systems to automatically shut down the unit to protect
against potentially damaging conditions. Some of these
systems include:
Alarms:
Model 20 kW Synergy
Rated Voltage 240
Rated Maximum Load Current
(Amps) at rated voltage (LP)* 83.3
Main Circuit Breaker 100 Amp
Phase 1
Rated AC Frequency 60 Hz
Battery Requirement
12 volts, Group 26R-540CCA
Minimum or Group 35AGM-
650CCA Minimum
(see Replacement Parts)
Enclosure Aluminum
Unit Weight (lbs/kilos) 481 / 218
Normal Operating Range
This unit is tested in accordance to
UL 2200 standards with an operat-
ing temperature of -20 ºF (-29 ºC)
to 122 ºF (50 ºC). For areas where
temperatures fall below 32 ºF (0
ºC), cold weather accessories are
recommended. When operated
above 77 ºF (25 ºC) there may be a
decrease in engine power. (Please
reference the engine specifica-
tions.)
These generators are rated in accordance with UL 2200, Safety Stan-
dard for Stationary Engine Generator Assemblies, and CSA-C22.2 No.
100-04 Standard for Motors and Generators.
* Natural Gas ratings will depend on specific fuel joules/BTU content.
Typical derates are between 10-20% off the LP gas rating.
** Circuits to be moved must be protected by same size breaker. For
example, a 15 amp circuit in the main panel must be a 15 amp circuit
in the transfer switch.
Model 20 kW Synergy
Type of Engine G-Force 1000 Series
Number of Cylinders 2
Displacement 999 cc
Cylinder Block Aluminum w/ cast iron sleeve
Recommended Spark Plug see Replacement Parts
Spark Plug Gap 1.02 mm (0.040 in)
Valve Clearance 0.05 - 0.1 mm
(0.002 - 0.004 in)
Starter 12 VDC
Oil Capacity Including Filter Approx. 1.9 qt (1.8 L)
Recommended Oil Filter see Replacement Parts
Recommended Air Filter see Replacement Parts
Engine power is subject to and limited by such factors as fuel BTU/joules,
ambient temperature and altitude. Engine power decreases about 3.5
percent for each 1000 feet (304.8 meters) above sea level and also will
decrease about 1 percent for each 6 ºC (10 ºF) above 15 ºC (60 ºF) ambi-
ent temperature.
•High Temperature
•Low Oil Pressure
•Overcrank
•Overspeed
•Overvoltage
•Undervoltage
•Overload
•Underspeed
•RPM Sensor Loss
•Controller Fault
•Wiring Error
•Fuse Problem
•Stepper Overcurrent

General Information
8Owner’s Manual for 60 Hz Synergy™ Generators
Warnings:
The control panel contains a display which alerts the
operator when a fault condition occurs. The above list is
not all inclusive. See Operation for more information
about alarms and control panel operation.
NOTE: A warning will indicate a condition on the
generator that should be addressed, but will not shut the
generator down. An alarm will shut the generator down to
protect the system from any damage. In the event of an
alarm, an owner can clear the alarm and restart the
generator prior to contacting an IASD. If the intermittent
issue occurs again, contact an IASD.
NOTE: For Synergy-specific alarms, see General
Troubleshooting.
Emission Information
The United States Environmental Protection Agency (US
EPA) (and California Air Resources Board (CARB), for
engines/equipment certified to California standards)
requires that this engine/equipment complies with
exhaust and evaporative emissions standards. Locate
the emissions compliance decal on the engine to
determine applicable standards. For emissions warranty
information, please reference the included emissions
warranty. Follow the maintenance specifications in
Maintenance to ensure that the engine complies with the
applicable emissions standards for the duration of the
product’s life.
This generator is certified to operate on Liquid Propane
Vapor fuel or pipeline Natural Gas.
The Emission Control System code is EM (Engine
Modification). The Emission Control System on this
generator consists of the following:
Fuel Requirements
The engine has been fitted with a dual fuel carburetion
system. The unit will run on natural gas or LP gas
(vapor), but it has been factory set to run on natural gas.
The fuel system will be configured for the available fuel
source during installation.
Recommended fuels should have a BTU content of at least
1000 BTUs per cubic foot (37.26 megajoules per cubic
meter) for natural gas, or at least 2500 BTUs per cubic foot
(93.15 megajoules per cubic meter) for LP gas (vapor).
NOTE: If converting to LP gas from natural gas, a
minimum LP tank size of 250 gal (946 L) is
recommended. See the installation manual (p/n 0L6632)
for complete procedures and details.
Battery Requirements
12 volts, Group 26R-540CCA minimum or Group 35AGM-
650CCA minimum (not included with unit.) See
Maintenance for proper battery maintenance procedures.
Battery Charger
The battery charger is integrated into the control panel
module in all models. It operates as a smart charger,
which ensures output charging levels are safe and
continuously optimized to promote maximum battery life.
Engine Oil Requirements
See Engine Oil Requirements in the Maintenance
section for proper oil viscosity.
Activating the Generator
The generator should be activated upon initial start-up.
See the installation manual for complete instructions.
Replacement Parts
•Charger Warning
•Charger Missing AC
•Low Battery
•Battery Problem
•Exercise Set Error
•USB Warning
•Download Failure
System Components
Air Induction - Intake Manifold
- Air Cleaner
Fuel Metering - Carburetor and Mixer Assembly
- Fuel Regulator
Ignition - Spark Plug
- Ignition Module
Exhaust
- Exhaust Manifold
- Muffler
- Resonator
Description 20 kW Synergy
26R Exide Battery 0H3421S
Spark Plug 0G0767A
Oil Filter 070185E
Air Filter 0J8478
Control Panel Fuse 0D7178T
Transfer Switch Fuses 073590A
AVR Filter 0K3054
(000105)
DANGER
Explosion and Fire. Fuel and vapors are
extremely flammable and explosive. Add fuel
in a well ventilated area. Keep fire and spark
away. Failure to do so will result in death
or serious injury.

General Information
Owner’s Manual for 60 Hz Synergy™ Generators 9
Accessories
NOTE: Performance enhancing accessories are available for air-cooled generators. Contact an IASD or visit
www.generac.com for additional information on replacement parts, accessories, and extended warranties. See also
http://www.ordertree.com/generac/air-cooled-homestandby-generators/.
Accessory Description
Cold Weather Accessories*—
•Battery Pad Warmer
•Oil Warmer
•Breather Warmer
* each sold separately
•Recommended in areas where temperatures fall below 0 °F (-18 °C).
(Not necessary for use with AGM-style batteries)
•Recommended in areas where temperatures fall below 0 °F (-18 °C).
•Recommended in areas where heavy icing occurs.
Scheduled Maintenance Kit Includes all pieces necessary to perform maintenance on the generator along with oil
recommendations.
Auxiliary Transfer Switch Lockout Enables any of the transfer switches to completely lock out one large electrical load by tying
into its control system.
Fascia Base Wrap The fascia base wrap snaps together around the bottom of the new air-cooled generators.
This offers a sleek, contoured appearance as well as offering protection from rodents and
insects by covering the lifting holes located in the base. Requires use of the mounting pad
shipped with the generator.
Touch-Up Paint Kit Very important to maintain the look and integrity of the generator enclosure. This kit includes
touch-up paint and instructions.
Wireless Local Monitor The Wireless Local Monitor is completely wireless and battery powered and provides owners
with instant generator status updates without ever leaving the house. Status lights (red,
yellow, and green) alert owners when the generator needs attention. Magnetic backing
permits refrigerator mounting and gives a 600 ft (183 m) line of sight communication.
Extended Warranty Coverage Extend your generator warranty coverage by purchasing extended warranty coverage.
Covers both parts and labor. Extended coverage can be purchased within 12 months of the
end-users purchase date. This extended coverage is applicable to registered units and end-
user proof of purchase must be available upon request.
Available for Generac®and Guardian®products. Not available for PowerPact™ and
EcoGen™ products or all international purchases.
Power Management Module (PMM) Power Management Modules are used in conjunction with the Smart Switch to increase its
power management capabilities. It gives the Smart Switch additional power management
flexibility not found in any other transfer switch
PMM Starter Kit The PMM Starter Kit consists of a 24 VAC, field installed transformer that enables the use of
the 24 VAC Power Management Modules (PMMs) and one PMM. The standard controller
(without starter kit) can control two HVAC loads with no additional hardware. This kit is
required if installing this unit in a home with a digital HVAC controls vs. the standard 24 VAC
system.

Operation
10 Owner’s Manual for 60 Hz Synergy™ Generators
Section 3: Operation
Site Prep Verification
The generator must be installed so that airflow into and
out of the generator is not impeded. Verify that all shrubs
or tall grasses within 3 ft (0.91 m) of the intake and
discharge louvers on the sides of the enclosure have
been removed. Install the generator on high ground
where water levels will not rise and endanger it. This unit
should not operate in or be subjected to standing water.
Verify that all potential water sources such as water
sprinklers, roof run-off, rain gutter downspouts, and sump
pump discharges are directed away from the generator
enclosure.
Turn the generator OFF before performing maintenance.
Remove 7.5 Amp fuse, T1 and T2 battery charge fuses,
and disconnect battery cables to prevent accidental start
up. Disconnect the NEGATIVE (-) cable first, then
disconnect the POSITIVE (+) cable. When connecting
the cables, connect the POSITIVE cable first, the
NEGATIVE cable last.
Generator Enclosure
The lid will be locked. A set of keys is attached to the
intake side of the generator.
1. Cut the plastic bag to remove the keys.
2. Use the keys to open the lid of the generator.
NOTE: The enclosed keys provided with this unit are
intended for service personnel use only.
Opening the Lid
Two locks secure the lid—one on each side (A in Figure
3-1). Open the protective rubber cap to access the
keyhole and press down on the lid above the side lock
and unlock the latch to properly open the lid.
Repeat for the other side. The lid may appear stuck if
pressure is not applied from the top.
NOTE: Always verify that the side locks are unlocked
before attempting to lift the lid.
Removing the Front Access Panel
Remove the front access panel by lifting it straight up and
out once the lid is open.
Always lift the front access panel straight up before
pulling it away from the enclosure (B and C in Figure 3-
1). Do not pull the panel away from the enclosure before
lifting up (D in Figure 3-1).
Risk of fire. Keep air inlet and exhaust areas
WARNING
(000251)
free from leaves, grass, snow and other debris.
Failure to do so could result in death, serious injury,
property, and equipment damage.
Automatic start-up. Disconnect utility power and
render unit inoperable before working on unit.
Failure to do so will result in death or serious injury.
(000191)
DANGER
(000182)
WARNING

Operation
Owner’s Manual for 60 Hz Synergy™ Generators 11
Figure 3-1. Side Lock Location and Front Panel Removal
Intake Side Panel Removal
See Figure 3-2. The intake side panel (A) must be
removed to access the battery compartment, fuel
regulator, and sediment trap.
1. Raise the lid and remove the front panel.
2. Use an Allen wrench to remove two mounting
screws (B) and the L-bracket screw (C).
3. Lift the intake panel up and away from the
generator.
NOTE: Always lift the intake side panel straight up
before pulling away from enclosure. Do not pull the panel
away from the enclosure before lifting up (D).
Figure 3-2. Intake Side Panel Removal
001797
A
A
BD
C
002961
A
BD
C

Operation
12 Owner’s Manual for 60 Hz Synergy™ Generators
Main Line Circuit Breaker (Generator
Disconnect)
This is a 2-pole breaker rated according to relevant
specifications. See (A) in Figure 3-3.
The breaker can be locked in the OFF (OPEN) position
for security. Use an appropriately-sized padlock (not
included) with a shackle long enough to pass through
both lock tabs (B).
Figure 3-3. Main Breaker
NOTE: DO NOT lock out the MLCB during normal
generator operation. Doing so will compromise automatic
standby functionality.
LED Indicator Lights
Figure 3-4. LED Indicator Lights
See Figure 3-4. Three LEDs are visible behind a
translucent lens on the generator side panel. These
LEDs indicate the operating status of the generator.
•Green LED “Ready” light (A) is illuminated when
utility is present and the control panel button is in
the AUTO position. The LED flashes when the
automatic transfer switch converts to generator
power during a utility power outage.
•Red LED “Alarm” light (B) is illuminated when the
generator is OFF or a fault is detected. Contact an
IASD.
•Yellow LED “Maintenance” light (C) is illuminated
when scheduled maintenance is due.
NOTE: Yellow Maintenance or Warning LED may be on
at the same time as either the Red or Green LED.
Control Panel Interface
See Figure 3-5. The control panel interface (A) is located
under the lid of the enclosure. Verify that both the left and
right side locks are unlocked before attempting to lift the
lid of the enclosure. Open the lid as directed in Opening
the Lid.
The 7.5A fuse is located beneath the rubber cover (B) to
the right of the control panel.
Verify that both the left and right side locks are securely
out of the way before closing the unit.
Figure 3-5. Generator Control Panel
All appropriate panels must be in place during any
operation of the generator. This includes operation by a
servicing technician while conducting troubleshooting
procedures.
001810
BA
001791
BCA
003621
A
B

Operation
Owner’s Manual for 60 Hz Synergy™ Generators 13
Using the AUTO/OFF/MANUAL
Interface
NOTE: Damage caused by mis-wiring of the
interconnect wires is not warrantable.
Interface Menu Displays
The LCD Panel
Button Description of Operation
AUTO
This button activates fully automatic system
operation. It allows the unit to automatically
start and exercise the generator according to
the exercise timer (see Setting the Exercise
Timer).
The Green LED on this button will flash if
running in Automatic mode and the connected
loads are running under generator power (utility
is lost).
OFF This button shuts down the engine and
prevents automatic operation of the unit.
MANUAL
This button cranks and starts the generator.
Transfer to standby power will not occur unless
there is a utility failure.
The blue LED on this button will flash if running
in manual mode and the connected loads are
running under generator power (utility is lost).
Feature Description
HOME
page
Default page that is displayed if no buttons are
pressed for 60 seconds. Normally shows
current status message and the current date
and time. The highest priority active alarm/
warning is automatically posted on this page,
as well as flashing the backlight when such a
condition is detected. In the case of multiple
alarms/warnings, only the first message will be
displayed. Press the OFF button and then
press the ENTER button to clear an alarm.
Display
Backlight
Normally off. The backlight will automatically
light and remain on for 30 seconds if the
operator presses any button.
MAIN
MENU
page
Allows the operator to navigate to all other
pages or sub-menus by using the arrow keys
and the ENTER button. Page can be accessed
at any time with several presses of the
dedicated ESCAPE button. Each press of the
ESCAPE button takes the operator to the
previous menu until the MAIN MENU displays.
This page contains information for - History,
Status, Edit, Debug.

Operation
14 Owner’s Manual for 60 Hz Synergy™ Generators
Menu System Navigation
To get to the MENU, use the ESCAPE button from any page. You may need to press the ESCAPE button several times
before reaching the MENU page. Navigate to the desired menu by using the ↑/↓buttons. When the desired menu is
displayed and flashing, press the ENTER button.
Figure 3-6. Navigation Menu
SYNERGY HSB MENU MAP
“Run Log”
ESC
ENTER
ENTER
SYSTEM
B
A
TTER
Y
HISTOR
Y
EDIT
Exercise Time
Å 14:00 Wednesday Æ
Firmware Update
Å Press Enter Æ
ESC
Current Date/Time
Å 2/12/13 12:22 Æ
ESC
ENTER
ENTER
ESC
ESC
ESC
ESC
ENTER
ENTER
ESC
ESC
ENTER
ENTER
ESC
ENTER
ENTERENTER
ENTER
ENTER
ENTER
ENTER
ESC
Switched to “OFF”
Hours of Protection
0 (H)
Language
Å English Æ
Fuel Selection
Å NG or
L
P Æ
Firmware Update
Å Insert USB Æ
“Alarm Log”
-
A
larm Log +
- Run Log +
- 1 thru 50 +
- 1 thru 50 +
Running Manual
Running-Utility Lost
Running-Remote Start
Running-2 Wire Start
Running - Exercise
Switched Off
Stopped -
A
uto
Stopped -
A
larm
ESC
Select Min (0-59)
- 0 +
ESC
ESC
Select Hour (0-23)
- 14 +
ESC ESC
Quiet Test Mode ?
- YES or NO +
Select Frequency
- WEEK
L
Y
+
- BIWEEK
L
Y
+
- MONTHL
Y
+ Quiet Test Mode only on
certain models
Language
+ English -
Fuel Selection
+ NG or
L
P -
Language
+ Espanol -
+
-
+
-
Battery Condition
“Good” “Inspect Battery” or “Check Battery”
*“Fuse Problem” on
Firmware 1.11 and older
ON
L
Y
Note: Menu functions and features may vary depending
on unit model and firmware revision.
003634a
Warning Message(s)
"Low Battery"
"Exercise Set Error"
"FIRMWARE ERROR-9"
"Fuel Pressure"
"Battery Problem"
"Charger Warning"
"Charger Missing AC"
"Overload Warning"
"Overload Cooldown"
"SEEPROM ABUSE"
"USB Warning"
"Download Failure"
Alarm Message(s)
"High Engine Temp."
"Low Oil Pressure"
"Overcrank"
"Overspeed"
"RPM Sense Loss"
"Underspeed"
"Internal Fault"
"FIRMWARE ERROR-7"
"WIRING ERROR"
"Over Voltage"
"Under Voltage"
"Overload Remove Load"
"Low Volts Remove Load"
"Stepper Over Current"
"Fuse Problem"

Operation
Owner’s Manual for 60 Hz Synergy™ Generators 15
Figure 3-7. Navigation Menu
UP ARROW = +
DOWN ARROW = -
ESC
DATE/TIME
SUB MENUS
MAINT
DEALER
EXAMPLE:
Inspect Battery 200 RnHr or 12/27/13
and
Next Maintenance 200 RnHr or 12/27/13
Current Date/Time
02/14/16 07:40
ESC
ESC
ENTER
ENTER ESC ENTER
ESC ESC ESC
ENTER
ENTER
ESC
MAINT:
Maint. Log
Run Hrs
Scheduled
ENTER
ENTER
Select Month (1-12)
- 2 +
Run Hours (H)
0.0
Select Date (1-31)
- 13 +
ENTER
Select Year (0-99)
- 13 +
ENTER
ENTER
Access Requires Password
Possible Message(s)
Corrupted File
Invalid File
File Not Found
Unsupported Device
"Current: VV XXXX "
"USB: VV XXXX"
"Are You Sure?"
"- Yes or No +"
ESC
ENTER
ESCENTER
ESCENTER
Select “Yes” then Press “Enter” to continue or Press “ESCAPE” to escape out of updating.
During update process the Blue “Manual” light flashes, then the Green “Auto” light flashes. Sequence
does this twice. When update is complete the unit returns to Install Wizard menu.
When the controller powers up the very first screen displays the version number for a few seconds.
When update is complete remove Thumb Drive, then follow the Install Wizard Menu.
- 1 thru 50 +
"Battery Maintained"
"Schedule A Serviced"
"Schedule B Serviced"
"Maintenance Reset"
"Inspect Battery"
"Service Schedule A"
"Service Schedule B"
ESC
Select Min (0-59)
- 0 +
ESC
Select Hour (0-23)
- 14 +
Language
+ Francais -
Language
+ Portuguese -
+
-
+
Select Day
- Wednesday +
001594b
+
-

Operation
16 Owner’s Manual for 60 Hz Synergy™ Generators
Setting the Exercise Timer
This generator is equipped with a configurable exercise
timer. There are two settings for the exercise timer.
Day/Time: Once set, the generator will start and exercise
at a predetermined day and time. During this exercise
period, the unit runs for approximately 5 minutes and
then shuts down.
Exercise frequency (how often the exercise will take
place): Exercise frequency can be set to Weekly,
Biweekly or Monthly. If Monthly is selected, the day of the
month must be selected from 1–28. The generator will
exercise for 5 minutes on that day each month. Transfer
of loads to the generator output does not occur during the
exercise cycle unless utility power is lost.
NOTE: If the installer tests the generator prior to
installation, press the “enter” button to skip setting up the
exercise timer.
NOTE: The exercise feature will operate only when the
generator is placed in the AUTO mode and will not work
unless this procedure is performed. The current date/time
will need to be reset every time the 12 volt battery is
disconnected and then reconnected, and/or when the
fuse is removed.
Table 3-1 details the exercise information and
programming options for all Home Standby generators.
Figure 3-8 shows the engine speed profile during a
typical low speed exercise cycle. While providing the
necessary periodic exercise operation, the lower rpm
also reduces fuel consumption, engine wear and noise.
Figure 3-8. Low Speed Exercise Profile
Battery Charger
NOTE: The battery charger is integrated into the control
module in all models.
The battery charger operates as a smart charger that
verifies:
•output is continually optimized to promote
maximum battery life.
•charging levels are safe.
NOTE: A warning is displayed on the LCD when the
battery needs service.
Manual Transfer Operation
Prior to automatic operation, manually exercise the
transfer switch to verify that there is no interference with
proper operation of the mechanism. Manual operation of
the transfer switch is required if electronic operation
should fail.
Transfer to Generator Power Source
1. Verify generator is OFF.
2. Set the main line circuit breaker (MLCB) (generator
disconnect) to OFF (OPEN).
3. Turn off the utility power supply to the transfer
switch using the means provided (such as a main
line utility breaker).
4. Use the manual transfer handle (A in Figure 3-9)
inside the transfer switch to move the main
contacts to STANDBY (loads connected to the
standby power source).
5. Press the control panel MANUAL button to crank
and start the engine.
6. Allow the engine to stabilize and warm up for a few
minutes.
7. Set the MLCB (generator disconnect) to ON
(CLOSED). The standby power source now
powers the loads.
Table 3-1. Generator Exercise
Characteristics
Generator Size 20 kW Synergy
Low Speed Exercise 1950 rpm
Exercise Frequency Options Weekly/Bi-Weekly/Monthly
Exercise Time Length 5 minutes
2600
2800
3000
3200
3400
3600
3800
1800
2000
2200
2400
0 sec 5 s 10 15 20 25 30 35 40 45 1min 5 min
001403
Exercise Speed (RPM)
Exercise Time
(000132)
DANGER
Electrocution. Do not manually transfer under load.
Disconnect transfer switch from all power sources
prior to manual transfer. Failure to do so will result
in death or serious injury, and equipment damage.