Nortek GR4GM-150 Series User manual

These instructions are intended primarily to assist qualified individuals experienced in the proper installation of this
appliance. Some local codes require licensed installation/service personnel for this type of equipment. Read all
instructions carefully before starting the installation.
GR4GM - 150/180 Series High Efficiency
Installation Instructions
Single Package Gas Heating/Electric Cooling Rooftop Units
Improper installation, adjustment, alteration,
service, or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult
a qualified installer, service agency, or the
gas supplier.
• Donottrytolightanyappliance.
• Donottouchanyelectricalswitch;do
not use any phone in your building.
• Immediatelycallyourgassupplierfrom
a neighbor’s phone.  Follow the gas
supplier’s instructions.
• Ifyoucannotreachyourgassupplier,
call the fire department.
• Extinguishanyopename.
Do not store or use gasoline or other
ammablevaporsandliquidsinthevicinity
of this or any other appliance.
WARNING:
!WHATTODOIFYOUSMELLGAS:
DONOTDESTROY.PLEASEREADCAREFULLYANDKEEPINASAFEPLACEFORFUTUREREFERENCE.
Model GR4GM-150/180 Shown

2

3
GENERAL SPECIFICATIONS......................................4
SAFETY CONSIDERATIONS.......................................4
 •Literature,Labels,andTags ..................................4
 •PressuresWithinTheSystem ...............................4
INSTALLATION REQUIREMENTS...............................4
 •EquipmentApplication ..........................................4
 •EquipmentCheck..................................................4
 •RequirementsandCodes .....................................4
 •UnitLocation .........................................................4
 •VentingRequirements..........................................4
 •UnitDimensions .................................................5-6
 •ClearancestoCombustibleMaterials....................7
 •Thermostat ............................................................7
 •AirFilterRequirements .........................................7
 •CondensateDrain .................................................7
UNIT INSTALLATION ...................................................8
 •Rooftop..................................................................8
 •GroundLevel.........................................................8
 •RiggingandHoisting .............................................9
AIR SUPPLY FOR COMBUSTION
 ANDVENTILATION .................................................9
CIRCULATING AIR SUPPLY......................................10
 •UnconditionedSpaces ........................................10
 •AcousticalDuctwork............................................10
 •DownowtoHorizontalConversion.....................10
GAS SUPPLY AND PIPING .......................................11
 •LeakCheck .........................................................11
GASCONVERSIONANDHIGH
ALTITUDE DERATE...............................................11
 •Conversion ..........................................................11
 •HighAltitudeDe-Rate .........................................12
ELECTRICALWIRING ...............................................12
 •General ...............................................................12
 •LineVoltage.........................................................12
 •BlowerSpeed......................................................13
 •RoomThermostat................................................13
SYSTEMCHECK .......................................................13
 •Pre-StartCheckList ............................................13
 •ElectricalDataTable......................................14,20
START-UP PROCEDURE..........................................14
 •AirCirculation.....................................................14
 •SystemCooling ..................................................15
 •SystemHeating..................................................15
 •VerifyingandAdjustingTemperatureRise..........15
 •VerifyingBurnerOperation.................................15
 •VerifyingOperationofOver-Temperature
Limit Control ....................................................15
COMPONENT FUNCTIONS .....................................16
 •FlameSensor.....................................................16
 •FlameRoll-OutControl ......................................16
 •PressureSwitch .................................................16
 •Over-TemperatureLimitControl .........................16
UNIT MAINTENANCE...............................................16
 •RefrigerantCharging..........................................16
 •RoutineMaintenance .........................................17
 •AirFilters ............................................................17
 •VentCoverAssembly .........................................17
 •CondensateDrainandOutdoorCoil ..................17
 •Electrical.............................................................17
 •MotorLubrication ...............................................17
 •BlowerCompartment .........................................17
 •HeatExchangerandBurnerMaintenance .........17
 •CleaningofHeatExchanger ..............................17
 •CleaningofBurners ...........................................18
OPERATING SEQUENCE.........................................18
 •CoolingMode .....................................................18
 •BlowerMode ......................................................18
 •HeatingMode.....................................................18
 •UnitFailstoOperate ..........................................19
 •HeatingRise/RangeTable..................................19
SPECIFICATIONS/ELECTRICAL DATA ....................20
LIGHTINGINSTRUCTIONS......................................21
WIRINGDIAGRAMS ............................................22-23
BLOWERPERFORMANCE .................................24-25
UNITFEATURES,LAYOUT.......................................26
ACCESSORIES,REPLACEMENTPARTS ...............27
INSTALLATIONCHECKLIST........................backcover
TABLEOFCONTENTS

4
GENERALSPECIFICATIONS
GR4GM Series Single Package Gas Heating/Electric
Cooling units are designed for outdoor rooftop or ground
level slab installations. The units are shipped ready for
downowductconnectionsandareeasilyconvertedfor
horizontalowconnections.
All models are shipped from the factory with the
following:
 1. AdjustableBelt
 2. Downowductconnections
 3. 24Vcircuitbreakerprotection.
UnitdimensionsareshownonthePhysicalDatapages.
SAFETYCONSIDERATIONS
It is the responsibility of the installer to ensure that the
installationismadeinaccordancewithallapplicablelocal
and national codes.
Equipment Check — All units have been securely
packaged at the point of shipment.  After unpacking
theunit,carefullyinspectitforapparentandconcealed
damage.  Claims for damage should be led with the
carrier by the consignee.
Requirements and Codes — The installer must comply
withalllocalcodesandregulationswhichgovernthistype
equipment.Localcodesandregulationstakeprecedence
overanyrecommendationscontained inthese instructions.
Intheabsenceoflocalcodes,theinstallationmustconform
withtheNationalFuelGasCode(ANSI2223.1,NFPA-54),
orCanadianinstallationsmustconformwithCAN/CGA-
B149installationcodes.Allelectricalwiringmustbemade
inaccordancewithcodesandregulationsandwiththe
NationalElectricCode(ANSI/NFPA70)orinCanadathe
Canadian Electric Code Part 1 CSA C.22.1. Air Ducts
must be installed in accordance with the standards of
the National Fire Protection Association “Standards for
InstallationofAirConditioningandVentilationSystems”
(NFPA90A),“Installationofcombinationheating/cooling
unitsmustalsoconformwithcurrentC.S.A.StandardB52
“MechanicalRefrigerationCode.”
TheNationalFuelGasCodeisavailablebywriting:
 AmericanNationalStandardsInstitute,Inc.
 1430Broadway
 NewYork,NY10018
NFPApublicationsareavailablebywriting:
National Fire Protection Association
 BatterymarchPark
 Quincy,ME02269
Unit Location — The R4 series gas/electric unit is
designed only for outdoor installations. Choosing the
locationoftheunitshouldbebasedonminimizingthe
lengthof thesupply andreturn ducts.Considerationshould
alsobegiventoavailabilityoffuel,electricpower,service
access,noise,andshade.
Venting Requirements — This unit has been equipped
withanintegralventingsystemanddesignedtooperate
onlywiththisventingsystem.Noadditionalventingshall
be used. This unit must be vented to the outdoors.
WARNING:
Improper installation, service, adjustment,
or maintenance may cause explosion, re,
electricalshockor otherhazardousconditions
whichmayresultinpersonalinjuryorproperty
damage. Unless otherwise noted in these
instructions, only factory authorized kits or
accessoriesmaybeusedwiththisproduct.
!
Literature,Labels,andTags—Whenworkingwiththis
equipment,followallprecautionsintheliterature,ontags,
and on labels provided with the unit and/or approved
eldinstalledkits.Thetypeofhazardandseverityare
described on each label or tag.
Pressures Within The System — This equipment
contains liquid and gaseous refrigerant under high
pressure. Installationor servicingshouldonly beperformed
byqualiedtrainedpersonnelthoroughlyfamiliarwiththis
type equipment.
INSTALLATIONREQUIREMENTS
Equipment Application — Before beginning the
installation,verify that the unitmodelis correct forthe
job.Theunitmodelnumberisprintedonthedatalabel.
This furnace is NOT to be used for temporary heating of
buildings or structures under construction.
WARNING:
Donotventfurnacethroughaconventional
venting system.
!

5
GR4GM-150/180SERIES–PHYSICALDATA
FRONT VIEW
COMPRESSOR
ACCESS
BLOWER MOTOR
ACCESS
ELECTRICAL PANEL
ACCESS
BURNER
ACCESS
CG
TOP VIEW
HEAT EXCHANGER
CONDENSER
COIL
CONDENSER
FANS (3)
4 (102) TYP
VENT HOOD
38.75"
93 (2362)
85 (2159)
INDUCER/BURNER
ASSY
4 (102) TYP
87 (2210)
41.25"
79 (2007)
CORNER "A"
CORNER "D"
CORNER "C"
CORNER "B"
REAR VIEW
STAGE 2
EVAPORATOR
FILTERS (8)
HOISTING
CONNECTION
POINTS
STAGE 1
EVAPORATOR HEAT EXCHANGER
TUBE ACCESS
88.50 (2248)
2 (51) TYP
43 (1092)
47 (1194)
AIRFLOW
COMPRESSOR
ACCESS
BLOWER
ACCESS
FILTER
ACCESS
Dimensionsshownininches(mm)

6
EVAPORATOR/FILTER END
ELECTRICAL SUPPLY
ENTRIES
MANUAL
FRESH
AIR PANELS
HORIZONTAL RETURN
AIR OPENING
66 (1676)
18 (457)
1 (25)
12.5 (318)
5.5 (140)
3 (76)
GAS SUPPLY
ENTRY
4 (210)
6 (152)
8.5 (216)
11 (279)
15.5 (394) 3 (76)
5.5 (140)
3 (76)
115V
=
GFCI
15.5 (394)
10.5 (267)
5.5 (140)
2.5 (64)
2 (51)
4 (102)
8 (203)8 (203)
68 (1727)
65.5 (1664)
20 (508) 16
(406)
16.5
(419)
2 (51)
29 (737) TYPCONDENSATE DRAIN
ACCESS (2)
SUPPLY AIR
OPENING
RETURN AIR
OPENING
BOTTOM POWER
WIRING ENTRY
BOTTOM CONTROL
WIRING ENTRY
2"K.O. BOTTOM GAS
SUPPLY ENTRY
BOTTOM VIEW
4 (102)
28 (711)
ROOF CURB
OUTLINE
CONDENSER END
BLOWER ASSEMBLY
CONDENSER COIL
COMPRESSORS (2)
BLOWER
MOTOR
GR4GM-150/180SERIES–PHYSICALDATA
† Factory Installed Option.
† Fieldwiringrequired.
Model No.
Weights Corner Weights
Unit Wt.‡ Shipping Wt. Center of Gravity A B C D
Lbs. Kg. Lbs. Kg. Inches(mm) Inches(mm) Lbs. Kg Lbs. Kg Lbs. Kg Lbs. Kg
R4GM-150*- 1570 714 1770 805 38.75(984) 41.25(1048) 376 171 449 204 339 154 405 184
R4GM-180*- 1650 750 1850 841 38(965) 41(1041) 390 177 482 219 348 158 430 195
‡Unitweightwithoutpackagingoreldinstalledaccessories.
Dimensionsshownininches(mm)

7
Aventcoverassemblyhasbeensuppliedwiththeunit.
It can be found secured to the gas controls within the
controlpanelareaofthisunit.Figure1showstheproper
installation of the vent cover assembly over the vent outlet
on the exterior of the louvered combustion panel. The
fasteners used to secure the vent cover assembly have
been included on the unit panel.
Thefollowinglistisasummaryoftherequirementsforthe
locationoftheterminationoftheventingsystem:
1. The location of the vent termination must be consistent
with the National Fuel Gas Code (ANSI Z223.1) or
CAN/CGA-B149 Installation Codes.
2. Theventterminationmustbelocatedatleastfour(4)
feethorizontallyfromanyelectricmeters,gasmeters,
regulators,andreliefequipment.
3. Theventterminationmustbelocatedatleastthree(3)
feetaboveanyforcedairinletlocatedwithinten(10)
feet.
4. Theventterminationmustbelocatedatleastfour(4)
feetbelow,four(4)feethorizontallyfrom,orone(1)
footaboveanydoor,window,orgravityairinletinto
any building.
5. Theventterminationmustbelocatedatleastone(1)
foot above grade.
6. The unit should be installed in such a manner as to
preventsnowaccumulationfromobstructingthevent
termination.
7. Theunitinstallationshallavoidareaswherecondensate
drainage may cause problems. Ensure that the
exhaustgaseswillnotimpingeonwindowsorbuilding
surfaces,whichmaybecompromisedordamagedby
condensation.Do not install the unit such that exhaust
from the vent termination is directed into window
wells,stairwells,underdecks,orinalcovesorsimilarly
recessed areas. The vent termination must not be
locatedaboveanypublicwalkways.
Figure 1. Vent Assembly
WARNING:
The vent cover assembly must be installed to
assure proper operation of the unit.
!
Clearances to Combustible Materials — See Figure 3
for required clearances to combustible materials. Refer
to the unit data label for the model number.
The GR4GM series gas/electric unit is suitable for
installationon combustibleooring or class A, B,or C
roofing materials. A clearance of at least 72 inches from
thebloweraccesspanelandfromthelouveredcontrol
accesspanelisrecommendedtoallowforservicingand
maintenance. Where accessibility to combustibles
clearances are greater than minimum clearances,
accessibility clearances must take preference.
Sufcientclearanceforunobstructedairowthroughthe
louveredcontrol accesspaneland throughthe outdoor coil
mustbe maintainedin order toachieverated performance.
See Figure 3 for minimum clearances to obstructions.
Thermostat —A twostagecooling/twostage heating
24VACthermostatshouldbeusedwiththeseunits.
Air Filter Requirements — A suitable air filter must be
installed in the unit or in the return air system. Refer to
Specification & Electrical Data Table for recommended
ltersizes.Airlterpressuredropmustnotexceed0.08
inchesWC.
Thisunitissuppliedwithairlters.Airlter(s)mustbe
installed ahead of the evaporator coil of this unit. All
return air to this unit must pass through the filters before
entering this unit.
Neveroperateunitwithoutalter.Afailure
tofollowthiswarningcouldresultinare,
personal injury, or death.
WARNING:
!
Condensate Drain-Condensate can be removed from
the unit through one of two 3/4” (19mm) PVC female
threaded fittings located on each side of the unit. One
inside the bottom of the filter access area and one at the
bottom of the control panel area. Both are accessible up
Figure2.CondensateDrain
Condensate
Drain
3"
Min.

8
Thisproductcontainsberglasswool.Disturbing
the insulation of this product during installation,
maintenance,orrepairwillexposeyoutoberglass
wool.Breathingthismaycauselungcancer.(Fi-
berglasswoolisknowntotheStateofCalifornia
to cause cancer.)
Fiberglasswoolmayalsocauserespiratory,skin,
and eye irritation.
!WARNING!
throughthebaserailusingastraightlengthof3/4”pipe
equippedwitha3/4”threadedmaletting.Onceinstalled
thedrainmustbeequipped witha 3”(8 cm)Min.trap
between the drain line and an open vent of the same
sizeforpropercondensateremoval.(SeeFigure2)Re-
fer to local codes and restrictions for proper condensate
disposal requirements. Ensure drain plug is installed in
unused drain fitting.
Whenconnectingrigiddrainline,holdanyttingswitha
wrenchtopreventtwisting.
Do not overtighten!
UNITINSTALLATION
Notice to Installer: Minimum Clearance requirements
shownareforclearancetocombustiblematerialsonly.
Specialconsideration ofunit location shouldbe givento all
sidesforapplicationofaccessoryitemssuchasHooded
HailGuards,HeatExchangerRemoval,EconomizerPower
Exhaust,BlowerandFilteraccess.
Minimum Clearance Requirements – GR4GM units are
certiedascombinationHeatingandCoolingequipment
for outdoor installation only at the minimum clearances
to combustible materials shown.  Clearances shown
are for both Downow and Horizontal discharge. (See
Figure3)
GR4GMunitsmaybeinstalledonwoodooringoron
ClassA,B,orCroofcoveringmaterialwhenusedwith
horizontalsupply andreturnair ducts.(Horizontalroof
curbisrequired.)
GR4GMunitsmaybeinstalledonwoodooringoron
ClassA,B,orCroofcoveringmaterialwhenusedwith
bottomdischargeandreturnairductsinconjunctionwith
a roof curb.
Figure 3. Minimum Clearances to Combustibles
Notice to Installer: IfinstallingGR4GMunitswithdown-
owdischarge,an8”minimumroofcurbisrequired.
Rooftop Mounting – For rooftop installations use the
appropriateaccessoryroofcurbandfollowallinstructions
includedwithit.Locatetheunitaccordingtolocalbuilding
codes and ordinances. The roof curb must be square and
level to ensure proper condensate drainage.
Onbottomdischargeapplications,supplyandreturnair
ductsmustbeattachedtotheroofcurbductsupports,
not the unit.  Install all ductwork before setting unit to
curb or frame.
Notice to Installer: Indownowapplicationsneverdrill
orpunchholesinunitbase.Leakagemayoccurifunit
bottom pan is punctured.
If any brand other than a NORDYNE Roof Curb is to
be used the frame support must be constructed using
non-combustible materials. Units require full perimeter
supportundertheunitandaminimumheightof8”.Sup-
ports must be made of steel or suitably treated wood
materials. The unit must be square and level to ensure
proper condensate drainage.
Theroofmustbecapableofhandlingtheweightofthe
unit.SeePhysicalDatapagesforunitweights.Reinforce
the roof if required.
Frame must be high enough to ensure prevention of any
moisture from entering the unit. Recommended height to
unitbaseis8”(20cm)forbothDownowandHorizontal
applications.
Secure roof curb or frame to roof using acceptable
mechanical methods per local codes.
Ground Level – If installing the unit at ground level,
provide a concrete mounting pad separate from the build-
ing foundation. The pad must be level to ensure proper
condensate disposal and strong enough to support the
unit’sweight.Makesuretheslabisaminimumof3”(8cm)
abovegradeandinanareathatdrainswell.
36" (92cm)
48" (122cm)
(92cm)
36"
(92cm)
36"

9
GR4GMunitclearancesmustbeinaccordancewiththose
showninFigure3.
Ductworkshouldbeattacheddirectlytoangesonrear
unitpanelandopeningofhorizontalroofcurb.
Units require full perimeter support under the unit. Sup-
ports must be made of steel or suitably treated wood
materials. The unit must be square and level to ensure
proper condensate drainage.
Frame must be high enough to ensure prevention of any
moisture from entering the unit. Minimum height to unit
baseis8”(20cm).
Unconditioned Spaces –Allductworkpassingthrough
unconditioned spaces must be properly insulated to mini-
mizeductlossesandpreventcondensation.Useinsulation
withanoutervaporbarrier.Refertolocalcodesforany
insulation material requirements.
Donotplacecombustiblematerialonoragainst
the unit cabinet. Do not place combustible
materials, including gasoline and any other
ammablevaporsandliquids,inthevicinity
of the unit.
WARNING:
!
All panels must be securely in place when
rigging and hoisting.
CAUTION
!
To avoid the risk of property damage or
personalinjury,it is the rigger’s responsibility
toensurethatwhatevermeansareusedto
hoist the unit are safe and adequate.
WARNING:
!
Figure 4. Rigging and Hoisting
AIRSUPPLYFORCOMBUSTIONAND
VENTILATION
Provisions must be made in the installation of this unit
to provide an adequate supply of air for combustion.
Detailed instructions for determining the adequacy of
an installation can be found in the current revision of the
NationalFuelGasCode(ANSIZ223.1)andNFPA54,or
inCanadian installationcodes(CAN/CGA-B149), or in
applicable local building codes. Consult local codes for
special requirements.
Iftheunitisoperatedwithinadequatecombustionairsupply
theameroll-outcontrollocatedabovetheburnerswill
open,turningoffthegassupplytotheburners.Theame
roll-out control is a manually re-setable device. DO NOT
installajumperwireacrossthiscontroltodefeatitsfunction.
DONOTresetthecontrolwithoutidentifyingandcorrecting
thefaultconditionwhichcausedthecontroltotrip.Ifthis
controlmustbereplaced,useonlythereplacementpart
specified in the Replacement Parts List.
Airopeningsinthedooroftheunit,warmairregisters,
and return air grilles must not be restricted.
Installation using methods other than those
described in the following sections must
complywiththeNationalFuelGasCodeand
all applicable local codes to provide sufficient
combustion air for the furnace.
WARNING:
!
Rigging and Hoisting –Removewoodentopandside
assemblyandloosentwobottomboardslocatedbetween
forkliftopenings.
The unit should be lifted by spreader bars using slings
or chains attached to the four lifting holes supplied from
the factory. Spreader bars are required to ensure even
loading. Ensure the lifting equipment is adequate for the
load.RefertoPhysicalDatapagesforunitweights.Keep
the unit in an upright position at all times. The rigging
must be located outside the units center of gravity. Refer
to Physical Data pages for center of gravity location.
LIFTING
BEAM CABLE OR CHAIN
SPREADER
BAR
SPREADER
BAR

10
CIRCULATINGAIRSUPPLY
Thisunitisdesignedonlyforusewithasupplyandreturn
duct.Anyexteriorducts,joints,oropeningsinthebuilding
roof or walls must be weatherized with conventional
ashing and sealing compounds. Air ducts should be
installedinaccordancewithallapplicablelocalcodesand
the standards of the National Fire Protection Association
“Standard for Installation of Air Conditioning Systems”
(NFPA90A).
Design the ductwork according to methods described
bytheAirConditioningContractorsofAmerica(ACCA)
ManualD.Theductsmustbeproperlysizednottoexceed
0.2inchesWCpressuredropat400scfmpernominal
ton of cooling capacity.
Itisrecommendedthattheoutletductbeprovidedwith
a removable access panel. This opening should be
accessiblewhentheunitisinstalledinserviceandshall
beofasizesuchthatthesmokeorreectedlightmay
be observed inside the casing to indicate the presence
ofleaksintheheatexchanger.Thecoverfortheopening
shallbeattachedinsuchamannerastopreventleaks.
Ifoutsideairisutilizedasreturnairtotheunitforventilation
or to improve indoor air quality, the system must be
designed so that the return air to the unit is not less than
50°F(10°C)duringheatingoperation.Ifa combination
ofindoorandoutdoorairisused,theductsanddamper
system must be designed so that the return air supply to
thefurnaceisequaltothereturnairsupplyundernormal,
indoor return air applications.
Unconditioned Spaces — Allductworkpassingthrough
unconditioned space must be properly insulated to
minimize duct losses and prevent condensation.  Use
insulationwithanoutervaporbarrier.Refertolocalcodes
for insulation material requirements.
AcousticalDuctwork—Certaininstallations mayrequire
theuseofacousticallininginsidethesupplyductwork.
Acoustical insulation must be in accordance with the
current revision of the Sheet Metal and Air Conditioning
ContractorsNationalAssociation(SMACNA)application
standard for duct liners. Duct lining must be UL classified
battsorblanketswitharehazardclassicationofFHC-
25/50orless.Fiberductworkmaybeusedinplaceof
internalductlinersiftheberductworkisinaccordance
with the current revision of the SMACNA construction
standardonbrousglassducts.Fibrousductworkand
internal acoustical lining must be NFPA Class 1 air ducts
whentestedperULStandard181forClass1ducts.
Downow to Horizontal Conversion — The unit is
shippedreadyfordownowductconnections.Ifhorizontal
ductsarerequired,theunitmustbeconvertedaccording
tothedirectionsinthehorizontalroofcurbkitforboththe
supply and return ducts.
Products of combustion must not be
allowed to enter the return air ductwork or
the circulating air supply. Failure to prevent
products of combustion from being circulated
into the occupied space can create potentially
hazardous conditions including carbon
monoxide poisoning that could result in
personal injury or death.
Allreturnductworkmustbeadequatelysealed,
alljointsmustbetaped,andtheductworkmust
besecuredtotheunitwithsheetmetalscrews.
Whenreturnairisprovidedthroughthebottom
oftheunit,thejointbetweentheunitandthe
return air plenum must be air tight.
Theroofcurborframingonwhichtheunitis
mountedmustprovidesound physicalsupport
oftheunitwithnogaps,cracks,or sagging
betweentheunitandthecurborframe.
Returnairandcirculatingairductworkmust
not be connected to any other heat producing
device such as a fireplace insert, stove, etc.
Doingsomayresultinre,explosion,carbon
monoxide poisoning, personal injury, or
property damage.
WARNING:
!
WARNING:
Combustible air must not be drawn from
a contaminated atmosphere. Excessive
exposure to contaminated combustion air
willresultinsafetyandperformancerelated
problems.
!
Tomaximizeheatexchangerlife,thecombustionair
mustbefreeofchemicalcontaminantswhichform
corrosiveacidiccompoundswhencombusted.Some
examplesofthesechemicalcontaminantsarechlorine,
uorine,andsulphur.Somecommonsourcesofthese
chemical contaminants are detergents, bleaches,
aerosolsprays,cleaningsolvents,andawidevariety
of commercial and household products.