Generac Power Systems C Option User manual

POWER SYSTEMS, INC.
®
50
0100
OIL
300
200
100
V
NOT IN AUTOMATIC
START MODE
OVER
CRANK
OVER
SPEED
TEST
RESET
HIGH
COOL
TEMP.
LOW
OIL
PRESS.
RPM
SENSOR
LOSS
200
150
100
A
50
PRE ALARM
LOW
OFF
PRESS
PRE ALARM
HIGH
COOL
TEMP
LOW
COOL
TEMP
ALARM
HORN
ON - OFF
HIGH
BATT
VOLTAGE
LOW
BATT
VOLTAGE
RUPTURE
BASIN
FILLING
LOW
FUEL
HIGH
FUEL
150
100
200
25
TEMP
0
40 40
AMPS
0000 1
TOTAL HOURS
PREHEAT
30 SEC
MAX START
STOP
AUTO
OFF
MANUAL
FUSE
15-A
AGC
0
31
INCREASE
VO LTA G E
ADJUST
65
60
Hz
Operator’s Manual
“C” Option Control Panel
This manual should remain with the unit.

Generac®Power Systems, Inc.
Important Safety Instructions
“C” Option Control Panel
SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe
operation be copied and posted in potential hazard areas. Safety should be stressed to all
operators and potential operators of this equipment.
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!
Study these SAFETY RULES carefully before
installing, operating, or servicing this equipment.
Become familiar with this manual and all literature
pertaining to the generator set and related equip-
ment. This equipment 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 precau-
tions.
Generac cannot possibly anticipate every possible cir-
cumstance that might involve a hazard. The warn-
ings in this manual, and on tags and decals
affixed to the equipment, are, therefore, not all-inclu-
sive. If using a procedure, work method, or operating
technique Generac does not specifically recommend,
you must satisfy yourself that it is safe for you and oth-
ers. Also must make sure the procedure, work method,
or operating technique that is used does not render the
equipment unsafe.
GENERAL HAZARDS
• For safety reasons, Generac recommends that this
equipment be installed and serviced by a Generac
Authorized Service Dealer or other qualified electri-
cian or installation technician who is familiar with
applicable codes, standards, and regulations. The
operator also must comply with all such codes, stan-
dards, and regulations.
• When working on this equipment, remain alert at all
times. Never work on the equipment when physical-
ly or mentally fatigued.
• Inspect the equipment regularly, and promptly repair
or replace all worn, damaged or defective parts,
using only factory-approved parts.
• Before performing any maintenance on the generator
or any related equipment, disconnect the generator’s
battery cables and remove panel fuse to prevent acci-
dental startup. Disconnect the cable from the battery
post, indicated by a NEGATIVE, NEG, or (–) first.
Reconnect that cable last.
ELECTRICAL HAZARDS
• Generators produce dangerous electrical voltages
and can cause fatal electrical shock. Avoid contact
with bare wires, terminals, connections, etc., while
the generator and related equipment are running.
Ensure all appropriate covers, guards, and barri-
ers are in place before operating the equipment. If
working around an operating unit, stand on an
insulated, dry surface to reduce potential shock
hazards.
• Do not handle any kind of electrical device while
standing in water, while barefoot, or while hands or
feet are wet. DANGEROUS ELECTRICAL SHOCK
MAY RESULT.
• If people must stand on metal or concrete while
installing, operating, servicing, adjusting, or repair-
ing this equipment, place insulative mats over a dry
wooden platform. Work on the equipment only while
standing on such insulative mats.
• Wire gauge sizes of electrical wiring, cables, and cord
sets must be adequate to handle the maximum elec-
trical current (amperage) to which they will be sub-
jected to.
• Before installing or servicing this equipment, make
sure that all power voltage supplies are positively
TURNED OFF at their source. Failure to do so will
result in hazardous and possibly fatal electrical
shock.
• When installed with an automatic transfer switch, the
generator may crank and start anytime, without
warning. To prevent injuries caused by sudden start-
up, disable the generator’s automatic start circuit
before working on, or around, the unit. Then, place
a “Do Not Operate” tag on the generator control
panel and on the transfer switch.
• 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 vic-
tim from the live conductor. AVOID DIRECT CON-
TACT WITH THE VICTIM. Use a nonconducting
implement, such as, a rope or board, to free the vic-
tim from the live conductor. If the victim is uncon-
scious, apply first aid and get immediate medical
help.
• Never wear jewelry when working on this equipment.
Jewelry can conduct electricity, resulting in electric
shock, or may get caught in moving components,
causing injury.
FIRE HAZARDS
• For fire safety, the generator and related equipment
must be installed and maintained properly.
Installation always must comply with applicable
codes, standards, laws, and regulations. Adhere
strictly to local, state, and national electrical and
building codes. Comply with regulations the
Occupational Safety and Health Administration
(OSHA) has established. Also, ensure that the
equipment is installed in accordance with the man-
ufacturer’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.
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Table of Contents
“C” Option Control Panel
Generac®Power Systems, Inc. 1
Part I - C Option Control Panel
Safety Rules ....................................Inside Front Cover
Section 1 — General Information ................................2
1.1 Overview ..............................................................2
1.2 Control Panel Components ..................................2
1.3 Optional Equipment ............................................2
1.3.1 Remote Annunciator Panel......................2
1.3.2 Remote Relay Panel ................................2
1.3.3 Additional Options..................................2
1.4 Panel Face Components ......................................2
1.4.1 AC Voltmeter ..........................................2
1.4.2 AC Ammeter ..........................................2
1.4.3 Frequency Meter ....................................2
1.4.4 Line-Phase Selector Switch ....................3
1.4.5 Voltage Adjust Potentiometer ..................3
1.4.6 Coolant Temperature Gauge ..................3
1.4.7 Oil Pressure Gauge ................................3
1.4.8 DC Voltmeter ..........................................3
1.4.9 Hourmeter ..............................................3
1.4.10 Start/Stop Switch....................................4
1.4.11 Auto/Off/Manual Switch ..........................4
1.4.12 Panel Fuse ..............................................4
1.5 Engine Monitor Panel ..........................................4
1.5.1 Not in Automatic Start Mode Lamp ........4
1.5.2 Overcrank Lamp ....................................4
1.5.3 High Coolant Temperature Lamp............4
1.5.4 Overspeed Lamp ....................................4
1.5.5 Low Oil Pressure Lamp ..........................5
1.5.6 RPM Sensor Loss Lamp..........................5
1.5.7 Test/Reset Switch ....................................5
1.6 Optional Annunciator Panel ................................5
1.7 Optional Remote Annunciator..............................6
1.8 Optional Alarm Relay ..........................................6
1.9 Preparation Before Startup ..................................6
1.9.1 Prior to Initial Startup ............................6
1.9.2 Startup Inspection ..................................7
Section 2 — Operation ....................................................7
2.1 Operating Unit with Manually-Operated
Transfer Switch ..................................................7
2.2 Operating Unit with Automatic Transfer Switch ..7
2.2.1 Manual Startup and Transfer ................7
2.2.2 Manual Retransfer and Engine
Shutdown ..............................................7
2.2.3 Preventing Automatic Startup ................8
Appendix 1 – Electrical Data ........................................9
Appendix 2 – Exploded Views and Parts Lists ......16
Appendix 3 – Interconnection Diagrams ................24
Part II - Remote Annunciator Panels
Section 1 — General Information ..............................29
1.1 Three Light Remote Annunciator ......................29
1.1.1 Installation............................................29
1.2 Five Light Remote Annunciator..........................29
1.2.1 Operation..............................................30
1.2.2 Customer Connections..........................30
1.2.3 Parts Included with Remote Panel ........30
1.3 18 Light Remote Annunciator ............................30
1.3.1 Generator Stop Signals ........................31
1.3.2 Latchable Signals..................................31
1.3.3 Other Lamps ........................................31
1.3.4 Panel Wiring Interconnections ..............31
1.4 Troubleshooting ................................................31
1.5 Annunciated Signals ..........................................32
1.6 Pre-Alarms ........................................................32
Appendix 4 — Electrical Data......................................33
Appendix 5 — Exploded Views and Parts Lists ......41
Appendix 6 — Notes ......................................................47
AUTHORIZED SERVICE
DEALER LOCATION
To locate the nearest GENERAC AUTHORIZED
SERVICE DEALER, please call this number:
1-800-333-1322
DEALER LOCATION INFORMATION
CAN BE OBTAINED AT THIS NUMBER.

1.1 OVERVIEW
The “C” option control panel is an analog generator
set control panel designed for Generac’s range of
standby generators. It allows for either manual or
automatic startup and shutdown.
The panel is housed in a steel sheet metal enclosure
that meets NEMA 1 specifications. The front face of
the panel includes a number of analog meters and
gauges that indicate generator operating conditions,
several indicator lamps for annunciation of engine
fault shutdowns, and various other generator set con-
trols.
1.2 CONTROL PANEL COMPONENTS
The control panel contains one main printed-circuit
board (PCB), the automatic voltage regulator (AVR),
optional components, such as battery monitor, dry
contact boards, run relay, etc., and terminal blocks
for external connections.
To find locations of the circuit board, refer to
Appendix 2 for the control panel exploded view.
Remove the 15-amp fuse from the front of the
panel during all engine maintenance to guard
against accidental or remote startup.
1.3 OPTIONAL EQUIPMENT
1.3.1 REMOTE ANNUNCIATOR PANEL
When connected to the generator via a 19 wire connec-
tion link, this multi-light remote indicator panel will
display the generator’s status.
1.3.2 DRY CONTACTS
This panel is similar to the remote annunciator, but, in
addition to indicator lights, it provides relay contact
closures for status (e.g., alarms). The dry contact
boards are form C rated contacts. The five function dry
contacts are normally open (N.O.). The six function dry
contacts are either normally open (N.O.) or normally
closed (N.C.).
1.3.3 ADDITIONAL OPTIONS
The following are some of the more frequently request-
ed optional accessories for the “C” option control panel:
• Emergency stop button
• Oil temperature gauge
• Engine run relay
• 100 dBa alarm horn
• Over/Under voltage relay
• Pre-alarm kit
• Control panel heater(s)
• Voltage change over switch (special)
• Battery monitor
• Over/Under frequency relay
• Over/Under current relay
1.4 PANEL FACE COMPONENTS
(FIGURE 1.1, PAGE 3)
1.4.1 AC VOLTMETER
This meter indicates the generator AC output voltage.
(Also see “Line-phase Selector Switch” and “Voltage
Adjust Potentiometer” in this section). To determine
the nominal rated AC voltage of the unit, refer to the
unit’s data plate.
NOTE:
Some generators are reconnectable to a variety of
voltages. Some units may be equipped with a
rotary “Voltage Selector Switch.” Be sure to read
the “Generator AC Lead Connections” section in
the Owner’s Manual.
1.4.2 AC AMMETER
This meter indicates the current draw of connected
electrical loads, in amps. (Also see “Line-phase
Selector Switch”). For continuous operation, never
exceed the rated maximum continuous current
capacity of the generator.
1.4.3 FREQUENCY METER
This meter indicates the generator’s AC output fre-
quency in “Hertz” (cycles per second).
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Section 1 — General Information
“C” Option Control Panel
2 Generac®Power Systems, Inc.

Generac®Power Systems, Inc. 3
1.4.4 LINE-PHASE SELECTOR SWITCH
This four-position switch permits selection of either
line-to-line or line-to-neutral readings on the panel
voltmeter and ammeter. Switch positions are as fol-
lows:
1.4.5 VOLTAGE ADJUST POTENTIOMETER
This potentiometer permits the operator to “fine-
adjust” the generator’s AC output voltage. Adjustment
range is plus or minus five percent from the mid-
point. Turn the knob clockwise to increase voltage,
counterclockwise to decrease voltage.
1.4.6 COOLANT TEMPERATURE GAUGE
This gauge indicates the engine coolant temperature.
Normal operating temperature should read between
185° to 215°F (85° to 102°C). If coolant temperature
exceeds a safe level, the engine shuts down automat-
ically.
NOTE:
Actual coolant temperature reading may vary due
to variables, such as, ambient temperature,
applied load, or cooling system condition.
1.4.7 OIL PRESSURE GAUGE
This gauge indicates oil pressure during operation.
After warm-up, oil pressure should be about 25-90
psi. Generac recommends that the operator record
the normal oil pressure during initial startup.
Sudden changes in oil pressure after first starting
indicate a possible engine problem.
NOTE:
Engine oil pressure may vary, depending on oil
viscosity, oil temperature, engine speed, ambient
temperature, etc. The engine automatically shuts
down if oil pressure drops below a safe level.
(10 psi.)
1.4.8 DC AMMETER
The engine is equipped with a belt-driven DC alter-
nator, which charges the battery while the unit is run-
ning. This ammeter indicates the rate of charge to the
battery during operation. If the needle drops to the
left of zero, the battery is discharging. Investigate and
correct this problem immediately. Erratic movement
of the needle should also be corrected immediately.
1.4.9 HOURMETER
The hourmeter provides a continuous indication of
engine/generator operating time, in hours and tenths
of hours. Use the hourmeter with the periodic main-
tenance schedule.
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Section 1 — General Information
“C” Option Control Panel
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1
2
Figure 1.1 – “C” Option Panel Components
Switch Single-phase Units Three-phase units
1 Line E1 to Neutral Line E1 to E2
2 Line E3 to Neutral Line E2 to E3
3 Line E1 to E3 Line E3 to E1
O No Reading No Reading

4 Generac®Power Systems, Inc.
1.4.10 START/STOP SWITCH
Use this switch to crank and start the engine manu-
ally, or to shut down an operating engine.
• To crank and start engine, first set the
Auto/Off/Manual switch to its “Manual” position.
• Hold the Start/Stop switch at “Start.” When the
engine starts, release the switch to its center (run)
position.
• To shut engine down, move the switch to its “Stop”
position.
1.4.11 AUTO/OFF/MANUAL SWITCH
This safety switch should be used to prevent auto-
matic startup of the engine when working on the
engine/generator. Use the switch as follows:
Auto Position
Always set switch to AUTO for automatic system
operation. This means that, when this generator is
installed with a GTS-type automatic transfer switch,
the generator automatically cranks and starts when
the utility source voltage drops below a preset level,
or the unit exercises, if programmed to do so.
Off Position
The engine cannot be started either automatically or
manually. Always set switch to OFF before working
on, or around, the engine-generator.
Manual Position
The engine can be cranked and started manually
using the panel Start/Stop switch. The engine will not
start automatically.
NOTE:
Also see “Engine Monitor Panel.” With switch set
to either OFF or MANUAL, a “Not in Automatic
Start Mode” lamp lights up on the panel.
1.4.12 PANEL FUSE
This fuse protects the control console’s DC circuits
against overload. If the fuse element melts open due
to an overload, engine cranking and startup will not
be possible. Should fuse replacement become neces-
sary, use only an identical fuse (part number
022676).
1.5 ENGINE MONITOR PANEL
This panel has five advisory shutdown lamps for sep-
arate engine fault conditions, plus a “Not in
Automatic Start Mode” lamp. Cranking and starting
will not be possible while any one, or more, of engine
fault conditions lamps is lit, with the exception of
“Not in Auto” illuminated in the manual mode. The
following apply:
• A “lamp ON” condition indicates that fault condi-
tion has been “latched” by DC control/latch-crank
circuit board.
• If any one of the lamps is ON (fault condition
latched), the engine cannot be cranked either man-
ually or automatically.
• To unlatch a fault (that is, to turn a lamp OFF) and
permit cranking, push the Test/Reset switch in.
The lamp will then go OFF, allowing for additional
cranking.
1.5.1 NOT IN AUTOMATIC START MODE
LAMP
This lamp comes ON to indicate that automatic start-
up of the engine is not possible. The lamp lights up
whenever the Auto/Off/Manual switch is set to OFF or
MANUAL.
1.5.2 OVERCRANK LAMP
The control console houses a DC control/latch-crank
circuit board (the “C” board) that controls engine
startup and shutdown. During automatic startup, the
engine cranks for about 14 seconds, rests for about
eight seconds, and so on, until eight crank-rest cycles
have occurred. At the end of eight attempts, cranking
stops, and the overcrank lamp goes ON.
1.5.3 HIGH COOLANT TEMPERATURE LAMP
This lamp comes ON if coolant temperature is too
high or coolant level is too low. The engine shuts
down automatically when such unsafe conditions
occur. The following apply:
• If the engine is started with an existing high coolant
temperature or low coolant level condition, the
engine shuts down, and the lamp comes ON when
engine speed reaches about 1000 rpm.
• If the engine starts normally but high tempera-
ture/low coolant level develops later, the engine
shuts down, and the light comes ON immediately.
1.5.4 OVERSPEED LAMP
An engine overspeed above a safe limit causes the
engine to automatically shut down, which turns ON
the indicator lamp. The overspeed lamp comes on
when the unit is run at a 15% faster rpm than rated.
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Section 1 — General Information
“C” Option Control Panel

Generac®Power Systems, Inc. 5
1.5.5 LOW OIL PRESSURE LAMP
This lamp lights up (latches) to indicate low oil pres-
sure in the engine as follows:
• During cranking, after engine has reached 800 to
1000 rpm, the circuit allows four seconds for oil
pressure to build.
• In auto mode, if the unit runs above 800-1000 rpm
for more than four seconds, and oil pressure is
below a safe level, the engine shuts down, but the
lamp does NOT go ON. The system then actuates
eight restart attempts; the engine shuts down, and
the lamp goes ON.
• If the engine starts normally with good oil pres-
sure, but oil pressure drops later, the system waits
five seconds for oil pressure to be restored. If pres-
sure is still low after a five-second delay, the engine
shuts down, and the lamp goes ON immediately.
1.5.6 RPM SENSOR LOSS LAMP
Units with the “C” Option console are equipped with
an rpm sensor, which is mounted directly over the
engine flywheel gear teeth. This sensor is a magnetic
pickup that emits an electrical pulse at the passage of
each flywheel gear tooth. Sensor electrical signals are
used by the DC control/latch-crank circuit board as
engine speed (rpm) signals. The circuit board uses
these rpm signals (a) to establish a starter lockout
speed, and (b) to shut down the engine if the engine
runs too fast (overspeed). If the rpm signals to the
circuit board are lost, engine shutdown occurs, but
the lamp will not light, (i.e., the condition will not
latch), then, depending on whether the sensor signal
loss occurred during a manual or an automatic start
attempt, the following events occur:
Manual Startup
If the engine starts within two seconds after cranking
begins, shutdown occurs as soon as the Start/Stop
switch is released, but without a lamp ON condition
(latching does not occur). If engine does not start
within two seconds after cranking begins, which dis-
ables starting, the rpm sensor loss light goes ON.
Automatic Startup
The engine recranks within about one second after it
has stopped. If sensor loss persists, engine shuts
down, and lamp lights about two seconds after
cranking has restarted.
If engine starts within two seconds after recrank has
begun, the starter remains engaged until the two-sec-
ond delay is over.
1.5.7 TEST/RESET SWITCH
To test all lamps, push this switch in. Following any
fault shutdown with any monitor panel lamp illumi-
nated, engine cranking is inhibited. To reset the sys-
tem (unlatch a fault) and crank the engine again,
push the switch in (lamp must go out). If the switch
is actuated with the engine running, only the lamps
will be tested. The engine will not shut down.
NOTE:
If engine shuts down due to some unmonitored
problem (such as, out of fuel or failed ignition sys-
tem), none of the lamps will come ON. If such an
unmonitored shutdown occurs with the
Auto/Off/Manual switch set to AUTO, engine
recranks and attempts to start for any of the cycles
remaining in the eight-crank limit. After all eight
crank cycles have been used, the engine shuts
down, and the OVERCRANK lamp goes ON.
1.6 OPTIONAL ANNUNCIATOR PANEL
Some units may come equipped with a factory-
installed annunciator panel having up to nine annun-
ciated fault conditions displayed (Figure 1.2). This
optional panel is often called a “prealarm” panel,
since it warns of impending problems before an actu-
al fault shutdown occurs.
The panel is designed to monitor various engine con-
dition-sensing devices having normally-open (N.O.) or
normally-closed (N.C.) contacts.
Figure 1.2 — Optional Annunciator (Prealarm)
Panel
ALARM HORN
ON/OFF
LOW
FUEL
LOW COOL
TEMP
HIGH
BATTERY
VOLTAGE
LOW
BATTERY
VOLTAGE
HIGH
OILTEMP
SHUTDOWN
HIGH
OILTEMP
PRE-ALARM
PRE-ALARM
LOW OIL
PRESSURE
PRE-ALARM
HIGH COOL
TEMP
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Section 1 — General Information
“C” Option Control Panel

6 Generac®Power Systems, Inc.
1.7 OPTIONAL REMOTE
ANNUNCIATOR
An optional 18-light REMOTE annunciator panel that
can be mounted on a wall (Figure 1.3) is also avail-
able. For information on the remote annunciator pan-
els, ask the local dealer/distributor or consult the fac-
tory. Ask for information on the Models 9555 and
9556 remote annunciator panels. The following apply
to the remote annunciator panels:
• It is designed for use with installation having a
Generac Power Systems GTS-type transfer switch
and a “C” Option control panel.
• The panel is available in both flush-mounted
(Model 9556) and surface-mounted (Model 9555)
configurations.
• The panel has a built-in audible alarm horn, with a
reset switch to turn off the horn without disturbing
the lighted indication.
• Remote monitoring of the standby generator set
provides enough information to avoid unnecessary
maintenance trips to the generator site.
Figure 1.3 — Optional 18-Light Remote
Annunciator
1.8 STANDARD ALARM RELAY
The generator’s DC control/latch-crank circuit board
is equipped with an alarm relay “driver”. All units
with “C” Option control panels are equipped with an
alarm relay that is connected to the circuit board
driver (Figure 1.4). If any one or more of the five
annunciated shutdown faults occur, the circuit board
driver energizes the optional alarm relay.
A remote-mounted alarm or annunciator device may
be connected across the relay contacts so that a fail-
ure will turn on the remote alarm or device. The con-
nected alarm device may range from an alarm horn
to a warning light to a telephone dialer with a pre-
recorded message. The alarm relay normally-open,
normally-closed, and common contacts are shown in
Figure 1.4.
Figure 1.4 — Standard Alarm Relay
1.9 PREPARATION BEFORE STARTUP
The instructions in this section assume that the
standby generator has been properly installed, serv-
iced, tested, adjusted, and otherwise prepared for
use by a competent, qualified installation contractor.
Be sure to read RULES FOR SAFE OPERATION on
the inside of the front cover carefully, before attempt-
ing to operate this (and related) equipment.
1.9.1 PRIOR TO INITIAL STARTUP
Before starting the generator for the first time, the
installer must complete the following:
• Properly locate and properly mount the generator,
transfer switch, and other standby system compo-
nents, in strict compliance with applicable codes,
standards, and regulations.
• Make sure the fuel supply system to the generator
(a) delivers the correct fuel at the correct pressure,
and (b) is properly purged and leak-tested accord-
ing to code. No fuel leakage is permitted.
• Have the engine crankcase properly filled to the
correct level with the recommended oil.
• Have engine cooling system properly filled with rec-
ommended coolant mixture. Check the system for
leaks and other problems.
• If engine is equipped with a mechanical governor,
make sure the governor is properly filled with oil.
Use crankcase oil to fill.
• Check engine v-belt tension and belt condition.
• Make sure the generator is properly connected to
an approved earth ground.
• The generator battery must be fully charged, prop-
erly installed and interconnected, and ready for
use.
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Section 1 — General Information
“C” Option Control Panel

Generac®Power Systems, Inc. 7
1.9.2 STARTUP INSPECTION
A standard, three-part form entitled “Startup
Inspection for Standby Power Systems” (Part No.
67377) must be completed by the installation techni-
cian or engineer in order to activate warranty. As stat-
ed on the form, inspections are to be performed only
by factory-trained personnel. The installer must com-
plete the form and distribute copies as follows:
• White copy: Mail to Generac Service Department,
P.O. Box 310, Eagle, WI 53119.
• Pink copy: For service file of installing dealer.
• Yellow copy: For the customer’s records.
2.1 OPERATING UNIT WITH MANUALLY
OPERATED TRANSFER SWITCH
If the generator was installed with a transfer switch
capable of manual operation only, the following
applies: A manually-operated transfer switch is one
that will not provide automatic startup and does not
include the intelligence circuit, which comprises of a
utility voltage sensor PCB, an inphase monitor PCB,
a seven day exerciser PCB, or other type of sensing
circuits found in a Closed Transition Transfer Switch
(CTTS) or a Bypass Isolation Switch (BIS).
2.2 OPERATING UNIT WITH
AUTOMATIC TRANSFER SWITCH
If the generator has been installed with a Generac
“GTS”-type automatic transfer switch, the engine may be
started and stopped either automatically or manually.
IMPORTANT: BE SURE TO READ THE APPLICA-
BLE AUTOMATIC TRANSFER SWITCH MANUAL
CAREFULLY. DIFFERENCES EXIST BETWEEN
TRANSFER SWITCHES.
2.2.1 MANUAL STARTUP AND TRANSFER
To crank and start the engine and to transfer electri-
cal loads to the STANDBY power source, proceed as
follows:
• See applicable transfer switch instructions. If so
equipped, set the Safety Disconnect Switch to
MANUAL.
• On the generator’s Meter and Control Panel, set the
Auto/Off/Manual switch to MANUAL.
The safety disconnect switch and the
Auto/Off/Manual switches must be set as
instructed above, or the generator will crank
and start as soon as the utility power to the
transfer switch is turned OFF.
• Turn OFF both the NORMAL (utility) and EMER-
GENCY (standby) power supplies to the transfer
switch, using whatever means is provided (such as
the main-line circuit breaker(s).
DO NOT attempt manual operation until all
power voltage supplies to the transfer switch
have been positively turned OFF; otherwise,
extremely dangerous---possibly lethal--- elec-
trical shock will result.
• Refer to the instructions that correspond to the
installed transfer switch. Manually actuate the
switch main contacts to their STANDBY (emer-
gency) position, as outlined in the corresponding
manual. LOAD circuit must be connected to the
STANDBY power supply before proceeding.
• On the generator console, hold the Start/Stop
switch START to crank the engine. Hold it until it
begins running, then release the switch to its cen-
tered (RUN) position.
• Let the engine warm up and stabilize at no-load.
• Turn ON the STANDBY power supply to the trans-
fer switch, using whatever means provided (such
as STANDBY source main-line circuit breaker).
• The generator will now power the load circuits.
2.2.2 MANUAL RETRANSFER AND ENGINE
SHUTDOWN
To retransfer LOAD circuits back to the NORMAL
(utility) power source and to stop the engine, proceed
as follows:
• Turn OFF both the UTILITY and STANDBY power
supplies to the transfer switch, using whatever
means provided, such as the main-line circuit
breaker(s).
DO NOT attempt manual operation until all
power voltage supplies to the transfer switch
have been positively turned OFF; otherwise,
extremely dangerous---possibly lethal---elec-
trical shock will result.
• Refer to the applicable transfer switch instruc-
tions. Manually actuate the transfer switch main
contacts to their utility position (LOAD connected
to UTILITY power supply).
• Turn ON the UTILITY power supply to the transfer
switch, using whatever means are provided (such
as the UTILITY main-line circuit breaker(s).
• Check that the UTILITY voltage is available to the
transfer switch (see appropriate transfer switch
instructions).
• Let the generator engine run at no-load for a few
minutes. Then, set the generator Start/Stop switch
to STOP. Wait for the engine to come to a complete
stop.
• Reset the system for fully automatic operation.
DANGER
◆
DANGER
!
DANGER
◆
◆
Section 2 — Operation
“C” Option Control Panel

8 Generac®Power Systems, Inc.
2.2.3 PREVENTING AUTOMATIC STARTUP
When installed with an automatic transfer
switch, Generac standby generators can crank
and start suddenly, without warning, when
UTILITY source voltage drops below a preset
value. To prevent possible injuries caused by
such sudden starts, disable the automatic
transfer switch before working on, or around,
the generator. Use any one, or more, of the fol-
lowing methods to disable the automatic start
function:
• Set the generator’s Auto/Off/Manual switch to OFF.
Neither a manual nor an automatic start can be
accomplished with this switch set to OFF.
• Remove the fuse from the generator control panel.
To remove the fuse, push fuse holder cap in and
turn cap counterclockwise. Remove cap and fuse
element.
• Refer to the automatic transfer switch instructions.
If the transfer switch is so equipped, set its Safety
Disconnect switch to MANUAL position to prevent
automatic startup and transfer.
• Disconnect battery cable from generator battery
post, indicated by a negative, NEG, or (-).
!
DANGER
◆
Section 2 — Operation
“C” Option Control Panel

Generac®Power Systems, Inc. 9
Appendix 1 — Electrical Data
“C” Option Control Panel 24 Volt, 400 kW and Larger
Interconnection Diagram — Drawing No. A7296-B

10 Generac®Power Systems, Inc.
Appendix 1 — Electrical Data
“C” Option Control Panel 24 Volt, 400kW and Larger
Electrical Schematic — Drawing No. A4722-A

Generac®Power Systems, Inc. 11
Appendix 1 — Electrical Data
“C” Option Control Panel 24 Volt, 400 kW and Larger
Wiring Diagram – Drawing No. A4723-B

12 Generac®Power Systems, Inc.
Appendix 1 — Electrical Data
“C” Option Control Panel 24 Volt Diesel, Less than 400 kW
Control Panel Electrical Schematic – Drawing No. 84850-C

Generac®Power Systems, Inc. 13
Appendix 1 — Electrical Data
“C” Option Control Panel 24 Volt Diesel, Less than 400 kW
Control Panel Wiring Diagram – Drawing No. 84849-C

14 Generac®Power Systems, Inc.
Appendix 1 — Electrical Data
“C” Option Control Panel 12 Volt Gas
Control Panel Electrical Schematic – Drawing No. 85023-A

Generac®Power Systems, Inc. 15
Appendix 1 — Electrical Data
“C” Option Control Panel 12 Volt Gas
Control Panel Wiring Diagram – Drawing No. 85024-A

9
27
24
22
21
11
13
59
66
60
5
7
3
58
59
25
M
I
C
A
6
4
12
1
6
1
55
6
2
56
4
5
7
58
77
72
26
53
A
7
3
68
6
46
68
78
26
10
26
53
14
17
18
26
26
18
D
7
23
5
19
59
17
17
77
15
70
VIEW
42
7
A
4
7
1
B
A
6
9
3
20
2
60
66
9
58
40
41
29
28
30
39
-
+
3
7
63
5
1
45
5
2
53
5
4
8
35
16
36
43
65
3
4
33
58
44
59
60
66
3
1
5
7
26
0
0
16 Generac®Power Systems, Inc.
Appendix 2 — Exploded Views and Parts Lists
“C” Option Control Panel 24 Volt Diesel
Control Panel – Drawing No. 84851-J

Generac®Power Systems, Inc. 17
ITEM PART NO. QTY. DESCRIPTION
1 070023 1 CONTROL PANEL BOTTOM
2 070026 1 SLKSCRND PANEL FRONT
3 070028 1 COVER CON PNL SIDE
4 067680 1 ASSY VOLTAGE REGULATOR 60HZ
092952 1 ASSY VOLTAGE REGULATOR 50HZ
5 039271 1 FITTING 90 DEGREE 3/4
6 034616 1 FITTING STRAIGHT 3/4
7 1 CIRCUIT BREAKER
8 082985 1 RES 100R 5% 5W ASSY=55405
9 082984 1 RES 120R 10% 2W ASSY 55406
10 086266 1 RES WW LUG 75R 5% 25W
11 055444 1 HEATSINK
12 030468 1 WASHER STEP NYLON .20
13 049939 1 RECTIFIER MSC 12A 600V 1N1206R
14 083089 1 ASSY PCB "C" CONTROL 12/24V
15 033147 1 SCREW HHM #10-32 X 1
16 024469 2 SCREW HHTT #10-32 X 3/8 CZ_
17 084853A 1 HARNESS F/<100KW 24V C DIESEL
084853B 1 HARNESS F/>101KW 24V C DIESEL
084853C 1 HARNESS F/12LMITS 24V C DIESEL
18 029333 6 TIE WRAP 7.4"X.19" NATL UL
19 084875 1 DECAL TERMINAL STRIP
20 055920 1 SWITCH SPST SPADE PNL MNT
21 055867 1 SWITCH TOG SPDT 15A SPD MOM
22 067625 1 SWITCH TOGGLE 3P3T 15/10A
23 032300 1 HOLDER FUSE
24 022676 1 FUSE 15A X AGC15
25 040213 4 PCB SUPPORT SNAP-IN 1/4"
26 0C2428 14 SCREW PHTT #6-32 X 1/2 ZYC
27 061945 1 SWITCH SELECTOR 6A AMP/V
28 071361 1 POT 5K 10% 2.25W PNL
29 050123 1 KNOB PLASTIC .25 SHAFT
30 055349 1 INSULATOR
31 070030 1 COVER GENERAC SILKSCREENED
33 070042 1 FREQUENCY METER 240V 55-65HZ
070042-A 1 FREQUENCY METER 240V 45-55HZ
34 1 AC AMMETER
35 1 AC VOLTMETER
36 083287 1 LIGHT HLDR CLR LNS W/O BULB
ITEM PART NO. QTY. DESCRIPTION
37 070081 1 HOURMETER
38 062304 1 AMMETER 40-0-40 DC
39 055405 1 GAUGE OIL PRESSURE
40 055406 1 GAUGE COOLANT TEMPERATURE
41 070083 1 ASSY PCB ENGINE MONITOR
42 055089 1 CONN PLUG PNL 15P AMP M-N-L
43 070082 1 BLOCKER LIGHT
44 053247 1 LUG RNGTNG INS 22-18 X10 X.322
45 029187 2 SPACER .19 X .31 X .50 PL
46 077043B 1 FLEX CONDUIT .50 ID
50 036904 4 SCREW PPHM #6-32 X 3/4 (NOT SHOWN)
51 036908 2 SCREW PPHM #6-32 X 1-1/4
52 022155 2 WASHER LOCK #6
53 022985 6 WASHER FLAT #6 ZINC
54 022188 2 NUT HEX #6-32 STEEL
55 036918 4 SCREW PPHM #8-32 X 1/2
56 022264 4 WASHER LOCK #8-M4
57 033121 16 SCREW HHC #10-32 X ½
58 022152 26 WASHER LOCK #10
59 023897 14 WASHER FLAT #10 ZINC
60 022158 20 NUT HEX #10-32 STEEL
61 038150 4 WASHER FLAT #8 ZINC
62 022471 4 NUT HEX #8-32 STEEL
63 084787 1 CABLE RIBBON 16"
64 070370 2 WASHER MICA .203
65 083288 1 LIGHT 28VDC .17A MIN BAYNT MNT
66 023762 4 WASHER SHAKEPROOF EXT #10 STL
68 081767 2 RELAY PNL 24VDC DPDT 10A
70 064000 1 CONTROL PNL SIDE
71 064008 1 COVER CON PNL TOP
72 098940 1 HARNESS C-OPT CTRL PNL
73 066040 1 DECAL - TERM STRIP
77 0C2323 4 SCREW PHTT #6-32 X 5/8 ZYC
78 0C1229 1 DECAL CUST CONN BOX
79 022507 4 SCREW HHC 1/4-20 X 1/2 G5 (NOT
SHOWN)
80 022097 8 WASHER LOCK M6-1/4 (NOT SHOWN)
81 040479 4 VIB MNT 1.0 X 1.0 X 1/4-20 (NOT SHOWN)
Appendix 2 — Exploded Views and Parts Lists
“C” Option Control Panel 24 Volt Diesel
Control Panel – Drawing No. 84851-J

18 Generac®Power Systems, Inc.
7
1
5
17
31
32
55
58
4
5
56
11
12
1
3
35
34
64
2
6
21
22
24
51
52
54
53
2
3
2
2
0
4
0
27
2
8
2
9
30
5
4
1
62
33
47
4
9
56
61
56
1
5
57
4
9
4
6
56
61
42
38
37
39
59
58
57
14
2
5
3
58
59
1
9
4
3
67
8
41
65
66
9
63
60
69
7
0
59
69
72
71
7
3
60
5
4
9
56
61
1
0
44
58
60
57
59
81
IN
S
TALLATI
O
N
O
F WIRE HARNE
SS
A
S
M
.
S
EE WIRIN
G
DIA
G
RAM #
8
4
6
7
3
F
O
R
13
10
7
A
3
6
9
A
4
1
A
7
B
VIEW
219A
3
1
219
+
-
(
2-PLCS
)
MI
CA
Appendix 2 — Exploded Views and Parts Lists
“C” Option Control Panel 24 Volt Gas
Control Panel – Drawing No. 84711-N