IOTA ITS-50R User manual

ITS-50R TRANSFER SWITCH
OWNER’S MANUAL
IOTA Engineering Transfer Switches provide automatic
power switching between two or three separate 120/240
voltACinputsources,includingpowercords,onboardgen-
erators, onboard inverters, or all three.The ITS will sense
the presence of available supplies and automatically se-
lectthe proper one.
The ITS can be installed at the electrical entry of the RV
on the line side of the main distribution panel, or it can be
installed on the load side of the panel between the main
panel and a sub panel, allowing switching for either the
entire electrical load or only designated circuits.
INSTALLATION
READ AND FOLLOW ALL SAFETY INSTRUCTIONS
I. DISCONNECT POWER
Make sure the generator is off, the external powercord is
unplugged, and the inverter, if any, is shut off.
II.MOUNTING LOCATION
The ITS mounting location may be on any interior surface
where the unit will be out of direct weather. The chosen
location must be accessible after installation is complete
to facilitate future servicing. If possible, mount the ITS
near the powercord entry or the location of the generator
output.Typical locations include under counter cabinets,
below closet compartments, inside the bed pedestal or
cabinets,overheadcabinets,under-floorstoragecompart-
ments accessed from the vehicle exterior, etc.CAUTION:
TOPREVENTEXPOSURETOFOREIGNCONTAMINANTS,
DONOTMOUNTTHETRANSFERSWITCHINANENGINE
COMPARTMENT,UNDERKITCHENSINKDRAINSORWA-
TERPIPES,WITHINTHEBATTERY COMPARTMENT, OR
ANY COMPARTMENT DESIGNED FOR STORAGE OF
FLAMMABLELIQUIDS SUCH AS GASOLINE.
III. ELECTRICAL PREPARATION
Use knockouts 12, 5, and 6 when installing the ITS-50R.
Do not use knockouts 3, 4, 7, and 8 when preparing the
ITS-50R for installation.
IV. MOUNTING
Mountthe ITS-50R withscrews through holes provided in
bottomcornersofthe can.Theunit should be screwed to a
solid surface firmly enough to hold its weight during ve-
hicleoperation.
V. ELECTRICAL CONNECTIONS
A. Attach an 8 gauge chassis ground wire to the transfer
switch ground bar. A direct access hole to the ground bar is
providedthrough the enclosure forconvenience.
B.Determineproper connections of wire conductorstoelectrical
terminals. On 120VAC wiring the ground wire is bare or green,
the neutral wire is white, and the hot wire is black. On 240 VAC
wiring there are two hot wires; one is black, and the other is red.
C. Strip the outer jacket from all of the incoming cables. Strip
insulation from all ends of the copper conductors.Insert cables
through clamps in openings. Do not tighten cable clamps at this
time.
D. Route internal ground wires around lower area of enclosure
and secure to ground wires away from electrical contacts on
components to avoid the possibility of electrical short-circuit.
E.Connectthe groundwires totheground bar.Tighten terminals
to a minimum of 20 inch-pounds.
F.Connectthe neutral(white)wire connections.
G. Connect the hot wire(s). If there is a black wire and a red wire
(for240VAC),it does not matter which is hot 1 and which ishot 2.
H. In some applications it may be desirable to feed a 120 volt
supply, such asaninverter, into both hotlegs ofatransfer switch,
so that the 120 volt supply can operate the entire RV load. Al-
though discretion is advised in designing this into the system, it
is acceptable,
as long as the connection to both hot legs is ac-
complished on the input side of the transfer switch
.To do this,
connect the hot from the 120 volt supply, such as an inverter, to
hot1, then attacha jumper wireof the samegauge from hot1 to
hot2. Consideration shouldbe given to the following:
•Allthe load must be 120 volt;youcannotoperatea 240
volt load from a 120 volt supply.
•Theremaybe aloadwhichwould be undesirabletorun
from this particular 120 volt supply;that load should be
isolated when the 120 volt supply is operating.The ITS-
30R is sometimes used as a‘lock-out’switch to prevent
specificloadsfrombeingoperatedfromdesignatedsup-
plies.Example:preventing a battery charger or air condi-
tioner from running from an inverter, yet operating from
generatoror powercord.
I.Tighten cable clamps on switch enclosure.
J.Attach lid.The lid is designed to snap on and should not open
withoutdeliberate effort.

12345
DESIGNATED CIRCUITS
TRANSFER
SWITCH
50 AMP
120/240 VOLT
50A POWERCORD
12 KW
GENERATOR
50 AMP
240 VOLT
TRANSFER
SWITCH
30 AMP
120 VOLT
INVERTER
3000 W
MAX
30
12 34 5 678
5050
INSTALLATION BETWEEN POWERCORD AND GENERATOR
(CONFIGURATION A)
The ITS-50R is designed with an easy-to wire bridge. Refer to
Diagram1 forwiringlugdesignations. Connectthepowercordneu-
tral to the powercord lug labeled NEUTRAL WHT. Connect
powercordhot 1 and hot 2 to powercordlugsHOT1 BLK and HOT
2RED.Connect thegeneratorneutral(s)togenerator lug labeled
NEUTRALWHT.Connect generator hot 1 and hot 2 to generator
lugsHOT 1 BLK and HOT2RED.Connect output to panel or other
destinationto theapplicable“panel”lugs.The bypassswitchshould
bein the“off”position (marked“1”).
INSTALLATION BETWEEN INVERTER AND ALTERNATING
SOURCE (CONFIGURATION B)
For installation between an inverter (default) and another power
supply (dominant), such as the output from a prior powercord/
generatortransferswitch,connecttheinverterneutralto“powercord’
lug labeled NEUTRAL WHT, and connect the inverter hot to
“powercord”lugslabeledHOT1 BLK andHOT2RED.Connectthe
alternatepowersupply neutralto“generator”lugNEUTRALWHT.
Connectalternatepower supply hot 1 and hot 2to“generator”lugs
HOT 1 BLK and HOT 2 RED. Connect the output to applicable
“panel”lugs.Theseconnections willallowanyothersupply todomi-
nate the inverter, and the inverter output will pass through the
normally closed contacts of the switch.This allows the inverter to
operateonly in theabsence of theother power supplies,which is
ideal for inverters. Set the timer delay bypass switch of the in-
verter/alternate source transfer switch to the ON position
.
INSTALLATION IN HYBRID SYSTEMWITH ITS-30R FOR DES-
IGNATED CIRCUITS (CONFIGURATION C)
Installthe ITS-50R on thelinesideofthemain distribution panel as
illustratedinConfigurationA.TheITS-30Rcanbeinstalledbetween
inverter (default) and a circuit panel supplied by the larger amp
alternatingpowersupply (dominant).Connecttheinverterto termi-
nals 7 and 8, and connect the 30 amp branch circuit to 5 and 6.
Connect the designated circuit panel to the output terminals.The
inverter will only supply the load in the absence of the 50 amp
power supply, in which case, only the load designated to the 30
amp branch circuit is supplied.The timer delay bypass switch on
the ITS-30R should be in the ON position.
MAIN
TRANSFER
SWITCH
50 AMP
240 VOLT
50A POWERCORD
12 KW
GENERATOR
50 AMP
120/240 VOLT
TRANSFER
SWITCH
50 AMP
240 VOLT
INVERTER
6000 W
MAX
12 34 5 678
5050
BRANCH CIRCUITS
MAIN
TRANSFER
SWITCH
50 AMP
240 VAC
50A POWERCORD
12 KW
GENERATOR
50 AMP
120/240 VAC
12 34 5 678
5050
BRANCH CIRCUITS
MAIN
TYPICAL INSTALLATION
CONFIGURATIONS
A
50 AMP SYSTEM
POWERCORD/
GENERATOR
B
C
50 AMP SYSTEM
POWERCORD
GENERATOR
INVERTER
DIAGRAM 1.
BRIDGE WIRING
DESIGNATIONS
50 AMP
HYBRID SYSTEM:
50A 240V SWITCH
POWERCORD
GENERATOR
30A 120V SWITCH
INVERTER
(Switching designated
circuits to sub-panel)

OPERATIONAL TESTING
READ AND FOLLOW ALL SAFETY INSTRUCTIONS
I. Plug in the powercord. If the main panel circuit breakers are
switched on, RV load should operate normally. Unplug the
powercord.
II.Start the generator.There is a pre-programmed 20-30 sec-
onddelayin thetransferswitch.The delayis designed toallow
thegeneratorabriefwarm-upperiod.Whenthe delaycompletes
its cycle the switch should engage and the RV load should
operate normally.An audible click should sound as the switch
engages.
III.Shut down the generator.As the generator winds down the
switchshould disengage without chatterorcycling. An audible
click should sound as the switch disengages.
IV. Plug in the powercord. Start the generator. After the pre-
programmeddelay, theswitch should transfer powerautomati-
callyfromthepowercordto thegenerator.Listenforthe audible
click as the switch transfers, as there will likely be no other
indicationthatthe switch has engaged.Shutdown the genera-
torand unplug the powercord.
V.Ontransferswitch arrangementswiththree powersupplies,
plug in the powercord, start the generator, and turn on the in-
verter.With all three supplies energized at the same time, the
switch will select the generator for the primary supply choice.
Shut down the generator. The switch will transfer to the
powercord. Unplug the powercord.The switch will transfer to
the inverter.Theinverter should always be connected so that it
is only selected in the absence of both the other supplies.
TROUBLESHOOTING
I. LOWVOLTAGE: Low voltage is harmful to most appliances.
Contactor-basedtransfer switchesarealso affectedbylowvolt-
age; if the voltage level drops far enough the contactor points
will “chatter”. Sustained contact chattering can cause transfer
switchdamage.Switchesthathavebeendamagedbychatter-
ing need to be returned to the factory for replacement.
GENERAL LOW VOLTAGE: Low voltage can be caused by
low voltage conditions such as an RV park with inadequate
wiring forcrowded camper conditions where everyone’s elec-
tricity suffers (brownout). In this case a voltmeter will be help-
ful and will show a low voltage reading from the park recep-
tacle, even before the RV is plugged in.When you experience
generallowvoltageconditions,remember,thatbrownoutscan
beharmfulto most appliances. A betteralternativemightbe to
utilize the generator until park voltage conditions improve.
LOCALIZED LOWVOLTAGE:Low voltage conditions can be
causedbyspecific situations such as anadditionalcord which
istoo long and toosmallfor the load. Donot attempt to extend
the RV powercord by using a 16 gauge 100 foot extension
cord,or anycordnot rated foran RV-size load.A localizedlow
voltage condition will result when a load is turned on which is
larger than that which the cord is designed for.Assoonasthe
RVtriestodrawmorecurrentthan theamountforwhichthecord
is rated, the voltage will fall
within the length of the cord,
and the
RVwillexperiencelowvoltage.Thisis especiallynoticeabledur-
ing inrushcurrent situationssuch asan air conditioner start-up.
Contactor-based transfer switches are affected by this.The
compressor will try to start, the voltage will drop, which will
cause the contactor to drop out, at which point the voltage
willriseto thepre-inrushlevel.Thecontacts willchatterwhen
theA/Ccompressorkicksin,howeverthevoltage may read
normal.Most meters are notfast enough to recordthis volt-
age drop.You can test for low voltage readings during this
inrushcyclebyreadingvoltageatthecontactorterminalswhile
manuallyholdingthecontactorplungerdowninits closedpo-
sition.Thiswilloverridethechatteringconditionandthemeter
willhave timeto registerthereduced voltage. Ifthiscondition
exists, identify and correct the low voltage situation before
proceedingfurther.
PHYSICAL INTERFERENCE:Some transfer switchmod-
elshavewiringconnections made by wire nuts on6″leads.
Occasionally on these models, the wiring connections will
getfolded into thecan in sucha manner thatthe wiring will
interfere with the physical operation of the relay. Visually
inspect for free operation of the relay(s).
TIME DELAY BYPASS SWITCH:The time delay function
in the control module on some models may be bypassed.
Relay-based transfer switches have incorporated into the
controlmodule board a smallswitchwhich allows the tech-
nician to activate or bypass the time delay.The time delay
is necessary during generator start-up so that the genera-
tor does not have to start under load;the delay is not nec-
essary for powercords or inverters. Therefore in transfer
switch operation where the module is controlling a supply
other than a generator, the delay switch should be set to
the bypass (ON) position. This will allow instantaneous
switching. Another time for bypassing the delay is during
diagnostic and troubleshooting efforts; if bypassing the
delay causes the switch to work when it otherwise won’t,
thenthe time delay has malfunctionedandtheboardshould
be replaced.To bypass the time delay, locate the switch on
the end of the circuit board and select the position on the
switch marked ON. Time delay bypass is now activated,
andtransfer will beinstantaneous.
FAILEDTIME DELAY CONTROL MODULE: It is possible
for a voltage spike, etc. to cause the time delay module to
fail:ifthishappenstheswitch will no longer transfer.Transfer
Switchmodels have a diagnosticLEDmounted on the con-
trolmodulecircuitboard.If the module is receiving 120VAC
inputandisoperatingproperly,theLEDwillbelit.Thismeans
thecontrolmodulehastimedforthe20-30seconddelay and
is now providing power to the coil on the relay.If the module
input is energized and the LED does not light after 30 sec-
onds, the time delay function in the module has failed, and
the module should be replaced.To verify this, try setting the
timedelayswitchontheboardtothedelaybypassposition;
the switch should transfer with no delay.
Note that this posi-
tion will allow emergency operation until the module can be
replaced;howeverthere willnot bea 20-30 seconddelayfor
generator start-up
. All repairs should begin by unplugging
andreplacing the control modulefirst.However,iftheLEDis
on and the switch is not working, then the control module is
functioningproperly andtheswitchhasotherproblems,such
asa failedrelayor contactor,andthe entire switchshouldbe
returnedfor replacement.

HI-POT TESTING
(MANUFACTURINGCOMPANIES ONLY)
NOTE:If the hi-pot test is performed from the plug on the
powercord, the test may only hi-pot the cord itself; it may
not test the RV wiring beyond the switch. The hi-pot test
shouldbe performed from either thetransferswitch
output
or from the main panel.Test as follows:
I.Turn on all circuit breakers in the panel.
II. Make sure the generator is off.
III.Make sure the powercord is unplugged.Verify that the
prongson the powercord plugareprotected so that thehi-
pot voltage won’t cause a fault reading from a short, or
cause bodily injury from electrical shock.
IV.Turnoffordisconnect all appliances that would be dam-
aged by the hi-pot test.
V.Connect the hi-pot leads to:
a)Transferswitchground bar
b)Transfer switch output terminals hot 1, hot 2 (if
present), and neutral.
VI. Energize the hi-pot and conduct test. This will hi-pot
test for leakage (short) between the current-carrying con-
ductorsand the ground inthe entire 120/240VACcircuitry
beyond the transfer switch. In most cases it will also test
the powercord itself.Turn off the hi-pot.
VII.Do not test the transfer switch generator input.The
hi-pot will damage the time delay control module in
the transfer switch. If the generator wires to the switch
mustbechecked, disconnect the generatorwiresfrom the
transfer switch and connect hi-pot test leads to the loose
wires.Reconnect wires aftertesting.
VIII. If hi-pot test fails, there is a short in the system.The
next step is to isolate the location of the short.Turn off the
main breaker in panel and hi-pot test again. If the test still
fails, the fault is between the switch and the panel. Test
cord for shorted plug.If the test passes, turn on the main
breaker, and turn on all branch breakers except one.Re-
test each branch circuit individually until the shorted cir-
cuit is isolated.Repair the fault and retest.The hi-pot test
is successful when there are no more fault indications.
GENERATOR NOTE
It is never advisable to start or stop a generator under
load.To prolong the life of this transfer switch, and the life
of the air conditioner, microwave oven, and other appli-
ances, always turn those appliances off before starting or
stoppingthegenerator.
MEDICAL APPLIANCES
IOTA Engineering L.L.C. will not knowingly sell an ITS
Transfer Switch for any life-support application. It is
strongly recommended that you do not operate any life
support equipment from a transfer switch. If the switch
should malfunction, or fail to operate due to other exter-
nalconditions, it is possiblethat all connected appliances,
including any life support equipment, will also shut down,
resulting in a risk of medical complications and potential
loss of life.
CAUTION
Do not install this or any electrical accessory in the bat-
tery compartment, or a compartment intended for storing
flammable liquids or liquids which produce flammable or
explosive fumes such as gasoline, etc.There are compo-
nents in theTransfer Switch which, in their normal opera-
tion, may cause arcing. In addition, the act of turning on a
light switch or unplugging the cord on an electrical appli-
ance can cause a spark, which can ignite any combus-
tible liquids or vapors.Therefore, do not install a trans-
fer switch in a compartment intended for storing flam-
mable liquids, and never store flammable liquids in-
side a compartment containing
any
electrical device.
WARRANTY
All ITS Series Transfer Switches come with a two-year
warranty.IOTAwarranties allTransfer Switchesin the con-
tinentalUnited States andCanada from defects in materi-
als or workmanship under normal use for two years from
date of retail purchase and will repair or replace any ITS
Transfer Switch under warranty found to be defective free
ofcharge. For completewarrantydetails,consultCustomer
Service orvisit www.iotaengineering.com.
Rev. 121702
68313-202
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