Nordyne R4G(M,N) - 090 Series Guide

Read this owner information thoroughly before attempting to operate or maintain this unit to
becomefamiliarwiththecapabilitiesanduseofyourappliance. Keepthisliteraturewhereyouhave
easyaccesstoitinthefuture. Ifaproblemoccurs,checktheinstructionsandfollowrecommendations
given. Ifthesesuggestionsdon’teliminateyourproblem,callyourNORDYNEServicingContractor
(Service PRO).
Anyadditions,changes,orconversionsrequiredinorderfortheappliancetosatisfactorilymeetthe
application needs must be made by a qualified installer, service agency, or the gas supplier using
factory specified and approved parts.
IMPORTANT
Single Package Gas Heating/Electric Cooling Rooftop Unit
(*)R4G(M,N) - 090/120 Series
Single Package Gas Heating /Electric Cooling Rooftop Unit
USER’S INFORMATION MANUAL
— Donotstoreorusegasolineorotherflammable
vaporsandliquidsinthevicinityofthisorany
other appliance.
— Installationandservicemustbeperformedby
a qualified installer, service agency, or the
gas supplier.
WARNING: If the information in this manual is
not followed exactly, a fire or explosion may
resultcausingpropertydamage,personalinjury,
or loss of life.
FOR YOUR SAFETY
— WHATTODOIFYOUSMELLGAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediatelycallyourgassupplierfrom
a neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.

2

3
Failuretopreventproducts
of combustion from being
circulatedintotheoccupied
spacecancreatepotentially
hazardous conditions in-
cluding carbon monoxide
poisoning that could result
in personal injury or death.
WARNING:
!
To maximize heat exchanger life,
thecombustionairmustbefreeof
chemicals which form corrosive
acidiccompounds inthe combus-
tion gases. Some examples of
thesechemicalsarechlorine,fluo-
rine, and sulphur. Some common
sources of these chemicals are
detergents, bleaches, aerosol
sprays, cleaning solvents, and a
wide variety of commercial and
household products.
GENERAL INFORMATION
Thisgasheating/electriccooling
unithas beendesignedand built
to provide many years of safe
anddependablecomfort,provid-
ing it is properly installed and
maintained. With regular main-
tenance,thisunitwilloperatesat-
isfactorilyyearafteryear. Abuse,
improper use, and/or improper
maintenancecanshortenthelife
of the appliance and create haz-
ards for you. Please read this
manual carefully to familiarize
yourself with operation, mainte-
nance,andsafetyproceduresfor
this unit.
Aregularserviceandmaintenance
schedule should be established to
ensure efficient and safe operation
oftheunit.Contactyourdealerfora
periodicunitinspectionbyaqualified
service technician.
Gas Heating/Electric Cooling
Unit Location
The area around the gas heating/
electriccoolingunitandthevicinity
of any other gas appliances must
be kept clear and free of
combustible materials, gasoline,
and other flammable vapors and
liquids. Do not store or use
flammable items such as paint,
varnish, or strippers in the vicinity
of the unit.
Do not use the area around the
unit as a storage area. This area
mustbekeptclearandclean. The
unit must also be kept clear of
loose or exposed insulation
materials. Examinetheunit'sarea
when it is installed or when
insulation is added, since some
insulation materials may be
combustible.
Do not use this appliance if any
part has been under water.
Immediatelycallaqualifiedservice
technician to inspect the unit and
to replace any part of the control
systemandany gas controlwhich
has been under water.
Familiarize yourself with the
controls that shut off the gas and
electrical power to the unit. If the
unit is to be shut down for an
extended period of time, turn off
boththe gasand electricalpower.
For your safety always turn off
both the gas and electrical power
before performing service or
maintenance on the furnace.
Combustion Air Supply
The gas heating/electric cooling
unit needs an adequate supply of
combustion and ventilation air for
properand safeoperation. Donot
block or obstruct air openings on
the unit or air openings supplying
the area where it is installed.
If the unit is operated with
inadequatecombustionairsupply,
the flame roll-out control switch
located above the burners will
open,turningoffthe gassupplyto
the burners. The flame roll-out
control is a manual-reset device.
DO NOT install a jumper wire
across this switch to defeat its
function. DONOTresetthecontrol
without identifying and correcting
the fault condition which caused
the control to trip. If this switch
must be replaced, use only the
factoryspecifiedreplacementpart.
Combustion air must not be
drawn from a corrosive
atmosphere.
CAUTION:
!
Toavoidpossibleequipment
damage, fire, or death, the
following instructions must
be observed regarding unit
location, combustion air
requirements, and operation
procedures.
WARNING:
!
Ductwork
The duct connections must be
physicallysoundandsealedtothe
unit's casing to prevent products
of combustion from entering the
occupied space.
The return air and circulating air
ductwork must not be connected
toanyotherheatproducingdevice
such as a fireplace insert, stove,
etc. Doing so may result in fire,
explosion,personalinjury,carbon
monoxide poisoning, or property
damage.

4
Cooling Operation— 2 Stage
1. Set the thermostat system
switch to COOL and the
thermostatfanswitchtoAUTO.
(See Figure 1)
2. Setthethermostattemperature
selectortothedesiredtempera-
ture level. The outdoor fans,
compressors,andindoorblower
will all cycle on and off to main-
tain the indoor temperature at
the desired cooling level.
Heating Operation — 2 Stage
1. Set the thermostat system
switch to HEAT and the
thermostatfanswitchtoAUTO.
(See Figure 1)
2. Set the thermostat tempera-
ture selector to the desired
temperaturelevel. The indoor
blower and gas heat module
will cycle on and off to main-
tain the indoor temperature at
the desired heating level.
NOTE: There is a factory set 3
minute time delay between
Stage1andStage2heatwhen
Stage 2 heating is required.
OPERATINGINSTRUCTIONS
Figure 1. Typical Thermostat
System Shutdown—
Set the thermostat system switch
to OFF and the thermostat fan
switch to AUTO. (See Figure 1)
The system will not operate,
regardless of the thermostat
temperature selector(s) setting.
To Operate the Indoor Blower
Continuously —
Setthe thermostatfanswitchtoON
(may be called CONT on some
thermostat models). (See Figure 1)
The indoor blower will start
immediately, and will run
continually until the fan switch is
reset to AUTO.
The continuous indoor blower
operationcanbeobtainedwiththe
thermostat system switch set in
any position, including OFF.
The continuous indoor blower
operation is typically used to
circulate the indoor air to equalize
a temperature unbalance due to a
solar load, cooking, or fireplace
operation.
NOTE:Thisunitisequippedwitha
manual-reset flame roll-out limit
switch. This switch acts to verify
thattheburnerflameisbeingdrawn
into the heat exchanger tubes. If
the flame is not being drawn into
thetubes,theflameroll-outswitch
will open within several seconds.
When this switch opens, the gas
valve will de-energize to stop the
flow of gas. The combustion
inducer will stay energized and
continue to operate until the
thermostatissatisfiedortheswitch
is closed. Do not reset the flame
roll-out switch before identifying
and correcting the fault condition
that caused the switch to open. If
theswitchwillnotresetorcontinues
to open, immediately contact a
qualifiedservicemantoidentifyand
repair the problem.
Should overheating occur,
orthegassupplyfailtoshut
off,shut off the manual gas
valve to the unit before
shutting off the electrical
supply.
WARNING:
!

6
2. Air Filters:
System Maintenance
Propermaintenanceismostimpor-
tanttoachievethebestperformance
from the appliance and should be
performed by a qualified service
technician at least once a year.
Follow the maintenance schedule
andtheinstructionsbelowforyears
of safe, trouble free operation.
• Do not place combustible
materials on or against the
cabinet.
• Do not store gasoline or any
other flammable vapors and
liquids in the vicinity of the
unit.
• Annually inspect the physi-
cal support of the unit to
ensure that it is physically
sound without sagging,
cracks, gaps, etc., around
the base so as to provide a
seal between the support
and the base.
• Annuallyinspectthereturn-
airconnectiontoensurethat
itis physicallysoundandis
still sealed to the casing of
the unit.
• Annually inspect the unit,
ductwork, and vent system
for signs of physical
deterioration.
•Always replace the doors
on the unit after servicing.
Do not operate the unit
withoutalldoorsandcovers
in place.
NOTE: Filters must be ULC ap-
proved or equivalent for use in
Canada.
Alwaysreplacethefilteraccess
panels after changing or clean-
ing the filters. Do not operate
unit without the filter access
panels in place.
3. Motor Lubrication:
CAUTION:
Donotstrikeanyoftheinternal
electrical components while
cleaning.
!
Lubrication of the motors in
this unit is not required. Do
notlubricateanymotorinthis
product.
WARNING:
!
CAUTION:
Becertaintheelectricalpower
totheunitisdisconnectedand
thegasisshutoffbeforedoing
the following recommended
maintenance.
!
WARNING:
Neveroperatetheunitwithout
afilterinthereturnairsystem.
Dust and lint in the return air
can build up on the internal
components, resulting in a
loss of efficiency, equipment
damage,andpossiblefirerisk.
!
(*)R4G(M,N) units are factory
equipped with pleated 2” dispos-
able filters. The filters should be
checkedperiodicallyandreplaced
(orcleaned)whennecessary with
filters of the same dimensional
size. Replace using disposable
filters with a minimum airflow
rating of 500 FPM or permanent
filters only. The filter rack is field
adjustable to accommodate 1”
permanentfilters. DO NOT use1”
disposable filters in (*)R4G(M,N)
units.
The motors for the circulating air
blower,outdoorfan,and combus-
tion blower are pre-lubricated at
the factory. No further oiling is
requiredforthelifeofthisproduct.
1. Regular Cleaning:
• Remove any debris from the
outdoorcoil,beingcarefulnot
todamagethealuminumfins.
• Check for and remove any
obstructions to condenser
airflow.
• Clean the blower compart-
ment regularly during the
heatingand coolingseasons
to remove any dust that may
have accumulated in the
compartmentorontheblower
and motor. Buildup of dust
on the blower and motor can
createexcessiveloadsonthe
motorresultinginhigherthan
normal operating tempera-
turesandpossibleshortened
service life.

7
Before Calling A Technician:
If the unit fails to operate in cooling, be certain of the following:
1. The thermostat is operating properly. Refer to “Cooling
Operation.”
2. The electrical power to the unit is turned on.
3. The filters are not dirty.
If the unit fails to operate in heating, be certain of the following:
1. The thermostat is operating properly. Refer to “Heating
Operation.”
2. The electrical power to the unit is turned on.
3. The gas is turned on.
4. The filters are not dirty.
Figure 3. Burner Inspection
Some components in the
burner vestibule are at high
temperatures while the
burners are operating. Use
caution to avoid personal
injury.
CAUTION:
!
4. Burner Maintenance:
Checktheburnerflamesatthestart
of every heating season. Set the
thermostattoatemperaturesetting
above the room temperature. With
thelouveredservicepanelinplace,
rotate the burner observation port
to the open position and visually
inspecttheburnerassemblytomake
surethattheflameisdrawndirectly
intothecenteroftheheatexchanger
tube (See Figure 3). In a properly
adjustedburnerassemblytheflame
colorshouldbeblue,however,some
light yellow streaks may occur on
the outer portions of the flame.

¢708121o¤
7081210
7081210
Specifications and illustrations subject to change
without notice and without incurring obligations.
PrintedinU.S.A.(11/01)
O’Fallon, MO
®
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