Read this owner information thoroughly before attempting to operate or maintain this unit to become
familiar with the capabilities and use of your appliance. Keep this literature where you have easy
access to it in the future. If a problem occurs, check the instructions and follow recommendations
given. If these suggestions don’t eliminate your problem, call your NORDYNE Servicing Contractor
(Service PRO).
Any additions, changes, or conversions required in order for the appliance to satisfactorily meet
the application needs must be made by a qualified installer, service agency, or the gas supplier
using factory specified and approved parts.
Single Package Gas Heating/Electric Cooling Rooftop Unit
GR4G(*) Series - 090/120/150/180
Single Package Gas Heating /Electric Cooling Rooftop Unit
7.5/10 Ton
GR4G* 090 Series Shown
12.5/15 Ton
GR4G* 150/180 Series
USER’S INFORMATION MANUAL
IMPORTANT
DO NOT DESTROY. PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
WHAT TO DO IF YOU SMELL GAS
• Donottrytolightanyappliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Leavethebuildingimmediately.
• Immediately call your gas supplier from a
neighbors phone. Follow the gas suppliers
instructions.
• Ifyoucannotreachyourgassupplier,call
the fire department.
FIRE OR EXPLOSION HAZARD
•Failure to follow safety warnings exactly
could result in serious injury or property
damage.
•Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
• Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WARNING:
!
2
3
GENERAL INFORMATION
This gas heating/electric cooling unit has been designed
and built to provide many years of safe and dependable
comfort, providing it is properly installed and maintained.
With regular maintenance, this unit will operate satisfactorily
year after year. Abuse, improper use, and/or improper
maintenance can shorten the life of the appliance and
create hazards for you. Please read this manual carefully
to familiarize yourself with operation, maintenance, and
safety procedures for this unit.
A regular service and maintenance schedule should be
established to ensure efficient and safe operation of the
unit. Contact your dealer for a periodic unit inspection by
a qualified service technician.
WARNING:
To avoid possible equipment damage, fire,
or death, the following instructions must be
observed regarding unit location, combustion air
requirements, and operation procedures.
Gas Heating/Electric CoolingUnit Location—The area
around the gas heating/electric cooling unit and the vicinity
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 must be kept clear and clean. The unit must
also be kept clear of loose or exposed insulation materials.
Examine the unit’s area 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.
Immediately call a qualified service technician to inspect
the unit and to replace any part of the control system and
any gas control which 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 both the gas
and electrical power. 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 proper and safe operation. Do not
block or obstruct air openings on the unit or air openings
supplying the area where it is installed.
If the unit is operated with inadequate combustion air
supply, the flame roll-out control switch located above the
burners will open, turning off the gas supply to 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. DO NOT reset the control without identifying and
correcting the fault condition which caused the control to
trip. If this switch must be replaced, use only the factory
specified replacement part.
CAUTION:
Combustion air must not be drawn from a
corrosive atmosphere.
To maximize heat exchanger life, the combustion air
must be free of chemicals which form corrosive acidic
compounds in the combustion gases. Some examples
of these chemicals are chlorine, fluorine, and sulphur.
Some common sources of these chemicals are detergents,
bleaches, aerosol sprays, cleaning solvents, and a wide
variety of commercial and household products.
Ductwork—
WARNING:
Failure to prevent products of combustion from
being circulated into the occupied space can
create potentially hazardous conditions including
carbonmonoxidepoisoningthatcouldresultin
personal injury or death.
The duct connections must be physically sound and sealed
to the unit’s casing to prevent products of combustion
from entering the occupied space.
The 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 fire,
explosion, personal injury, carbon monoxide poisoning,
or property damage.
OPERATING INSTRUCTIONS
Cooling Operation— 2 Stage
1. Set the thermostat system switch to COOL and the
thermostat fan switch to AUTO. (See Figure 1)
2. Set the thermostat temperature selector to the desired
temperature level. The outdoor fans, compressors, and
indoor blower will all cycle on and off to maintain the
indoor temperature at the desired cooling level.
4
Figure 1. Typical Thermostat
Heating Operation — 2 Stage
1. Set the thermostat system switch to HEAT and the
thermostat fan switch to AUTO. (See Figure 1)
2. Set the thermostat temperature selector to the desired
temperature level. The indoor blower and gas heat
module will cycle on and off to maintain the indoor
temperature at the desired heating level.
NOTE: There is a factory set 3 minute time delay between
Stage 1 and Stage 2 heat when Stage 2 heating is required.
WARNING:
Should overheating occur, or the gas supply fail
to shut off, shut off the manual gas valve to the
unit before shutting off the electrical supply.
NOTE: This unit is equipped with a manual-reset flame
roll-out limit switch. This switch acts to verify that the
burner flame is being drawn into the heat exchanger
tubes. If the flame is not being drawn into the tubes, the
flame roll-out switch 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 thermostat is
satisfied or the switch is closed. Do not reset the flame
roll-out switch before identifying and correcting the fault
condition that caused the switch to open. If the switch
will not reset or continues to open, immediately contact
a qualified serviceman to identify and repair the problem.
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 —Set the
thermostat fan switch to ON (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 operation can be obtained
with the 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.
5
A. This appliance does not have a pilot. It is equipped with
an ignition device which automatically lights the burner.
Do not try to light the burner by hand.
B. BEFORE OPERATING smell all around the appliance
area for gas. Be sure to smell next to the fl oor because
some gas is heavier than air and will settle on the fl oor.
WHAT TO DO IF YOU SMELL GAS
• 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 fi re
department.
C. Use only your hand to push in or turn the gas control
knob. Never use tools. If the knob will not push in or move
by hand, do not try to repair it, call a qualifi ed service
technician. Force or attempted repair may result in a fi re
or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualifi ed service technician
to inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
1. ATTENTION! Lire d’abord la liste des mesures de
sécurité ci-dessus.
2. Mettre le thermostat à la position minimale.
3. Couper le courant électrique qui mène à l’appareil.
4. Cet appareil ménager étant doté d’un système
d’allumage automatique, ne pas essayer d’allumer le
brûleur manuellement.
5. Retirer le panneau/volet d’accès de commande
(panneau supérieur s’il s’agit d’un modèle à deux
panneaux).
6. Réglez l’interrupteur de commande du gaz à la position
“OFF”. (voir Figure 1).
7. Attendre cinq (5) minutes pour s’assurer de la
dissipation du gaz.
En cas d’odeur, ARRÊTER LE PROCÉDÉ. Suivre les
instructions ci-dessus (Section B). En l’absence de
toute odeur de gaz, avancer à l’étape suivante.
8. Réglez l’interrupteur de commande du gaz à la position
“ON”. (voir Figure 1).
9. Remettre le panneau/volet d’accès de commande en
place (panneau supérieur s’il s’agit d’un modèle à deux
panneaux).
10. Rebrancher l’appareil sur le réseau électrique.
11. Ajuster le thermostat à la position désirée.
12. Si l’appareil ne fonctionne pas, suivre les “Directives
d’arrêt” cidessous et appeler le technicien de service.
A. Cet appareil ménager n’a pas de veilleuse. II est doté
d’un système d’allumage automatique. Ne pas essayer
d’allumer le brûleur manuellement.
B. AVANT L’USAGE. Attention à une possible odeur de
gaz surtout au niveau du plancher où les gaz les plus
lourds ont la tendance de se concentrer.
EN CAS D’ODEUR DE GAZ.
• Ne mettre en marche aucun appareil électrique.
• Ne toucher à aucun commutateur électrique, ne pas
employer le téléphone.
• Quitter le bâtiment immédiatement et avertir la
compagnie du gaz en utili sant le téléphone d’un voisin.
• A défaut de la compagnie du gaz, avertir le service des
pompiers.
C. Enfoncer ou faire tourner le robinet à gaz à la main
seulement. Ne jamais utiliser d’outils. S’il n’est pas
possible de faire tourner ou d’enfoncer le robinet à la
main, ne pas essayer de le réparer. Faire appel à un
spécialiste. Forcer ou tenter de réparer le robinet pourrait
être à l’origine d’une explosion ou d’un incendie.
D. II est déconseillé d’utiliser cet appareil en contact
prolongé avec l’eau. Faire inspecter ou remplacer
toute commande par un technicien qualifi é si un des
systèmes de contrôle du gaz s’est trouvé sous l’eau.
1. STOP! Read the safety information above on this label.
2. Set the thermostat to the lowest setting.
3. Turn off all electrical power to the appliance.
4. The appliance’s ignition de
vice automatically lights the
burner. Do not try to light burner by hand.
5. Remove the control access door/panel (upper door if
two-door model).
6. Move the gas control switch to the “OFF” position. (See
Figure 1)
7. Wait fi ve (5) minutes to clear out any gas. Then
smell for gas, including near the fl oor. If you
smell gas, STOP! Follow “B” in
above information. If you
don’t smell gas, go to
the next step.
8. Move the gas control
switch to the “ON”
position. (See Figure 1)
9. Replace the control
access door/panel
(upper door if two-door
model).
10. Turn on all electrical power to the appliance.
11. Turn the thermostat to a desired setting.
12. If the appliance will not operate, follow the instructions
“To Turn Off Gas To Appliance” and call your service
technician or gas supplier.
710674-0 (Replaces 7104030) (03/07)
1. Mettre le thermostat à la position minimale.
2. Débrancher l’appareil en prévision de la réparation.
3. Retirer le panneau/volet d’accès de commande
(panneau supérieur s’il s’agit d’un modèle à deux
panneaux).
4. Réglez l’interrupteur de commande du gaz à la position
“OFF”. Ne forcez pas. (voir Figure 1).
5. Remettre le panneau/volet d’accès de commande en
place (panneau supérieur s’il s’agit d’un modèle à deux
panneaux).
POUR VOTRE SÉCURITÉ.
À LIRE AVANT L’EMPLOI
FOR YOUR SAFETY READ
BEFORE OPERATING
1. Set the thermostat to the lowest setting.
2. Turn off all electrical power to the appliance if service is
to be performed.
3. Remove the control access door/panel (upper door if
two-door model).
4. Move the gas control switch to the “OFF” position. Do
not use force. (See Figure 1)
5. Replace the control access door/panel (upper door if
two-door model).
ATTENTION!
L’inobservation de ces instructions
peut entraîner un incendie ou une explosion pouvant
causer des dam mages à votre propriété à votre
personne, ou la mort.
WARNING:
If you do not follow these instructions
exactly, a fi re or explosion may result causing property
damage, personal injury, or loss of life.
TO TURN OFF
GAS TO APPLIANCE
DIRECTIVES D’ARRÊT
MODE D’EMPLOI
OPERATING INSTRUCTIONS
SWITCH
(INTERRUPTEUR)
Figure 1
6
SYSTEM MAINTENANCE
CAUTION:
Be certain the electrical power to the unit is
disconnected and the gas is shut off before doing
the following recommended maintenance.
Proper maintenance is most important to achieve the best
performance from the appliance and should be performed
by a qualified service technician at least once a year.
Follow the maintenance schedule and the instructions
below for years of safe, trouble free operation.
• Donotplacecombustiblematerialsonoragainst
the cabinet.
• Donotstoregasolineoranyotherammablevapors
and liquids in the vicinity of the unit.
• Annuallyinspectthephysicalsupportoftheunitto
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-airconnectiontoensure
that it is physically sound and is still sealed to the
casing of the unit.
•Annuallyinspecttheunit,ductwork,andventsystem
for signs of physical deterioration.
• Alwaysreplacethedoorsontheunitafterservicing.
Do not operate the unit without all doors and covers
in place.
CAUTION:
Do not strike any of the internal electrical
components while cleaning.
1. Regular Cleaning:
• Removeanydebrisfromtheoutdoorcoil,beingcareful
not to damage the aluminum fins.
• Checkforandremoveanyobstructionstocondenser
airflow.
•Clean the blower compartment regularly during the
heating and cooling seasons to remove any dust
that may have accumulated in the compartment or
on the blower and motor. Buildup of dust on the blower
and motor can create excessive loads on the motor
resulting in higher than normal operating temperatures
and possible shortened service life.
2. Air Filters:
WARNING:
Never operate the unit without a filter in the return
air system. Dust and lint in the return air can
build up on the internal components, resulting
in a loss of efficiency, equipment damage, and
possible fire risk.
GR4G(M,N)unitsarefactoryequippedwithpleated2”
disposable filters. The filters should be checked periodically
and replaced (or cleaned) when necessary with filters of the
samedimensionalsize.Replaceusingdisposablelters
withaminimumairowratingof500FPMorpermanent
filters only. For 7.5 and 10 ton models only: the filter rack is
eldadjustabletoaccommodate1”permanentlters.DO
NOTuse1”disposableltersinGR4G(M,N)-090/120units.
NOTE: Filters must be ULC approved or equivalent for
use in Canada.
Always replace the filter access panels after changing
or cleaning the filters. Do not operate unit without the
filter access panels in place.
3. Motor Lubrication:
WARNING:
Lubrication of the motors in this unit is not
required. Do not lubricate any motor in this
product.
The motors for the circulating air blower, outdoor fan, and
combustion blower are pre-lubricated at the factory. No
further oiling is required for the life of this product.
CAUTION:
Some components in the burner vestibule are
at high temperatures while the burners are
operating. Use caution to avoid personal injury.
4. Burner Maintenance:
Check the burner flames at the start of every heating
season. Set the thermostat to a temperature setting
above the room temperature. With the louvered service
panel in place, rotate the burner observation port to the
open position and visually inspect the burner assembly to
make sure that the flame is drawn directly into the center
of the heat exchanger tube (See Figure 3). In a properly
adjusted burner assembly the flame color should be blue,
however, some light yellow streaks may occur on the outer
portions of the flame.
7
Figure 3. Burner Inspection
Before Calling A Technician:
If the unit fails to operate in cooling, be certain of the
following:
1.Thethermostatisoperatingproperly.Referto“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.Thethermostatisoperatingproperly.Referto“Heating
Operation.”
2. The electrical power to the unit is turned on.
3. The gas is turned on.
4.Theltersarenotdirty.
708343A (Replaces7083430)
Specifications & illustrations subject to change without notice or incurring obligations (07/15).
O’Fallon,MO,©NortekGlobalHVACLLC2015.AllRightsReserved.
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