Marvair AVG24 User manual

Installation Instructions
GPac Wall Mount
Air Conditioner with Gas Heat
Models AVG Category I Furnace
Part # 01518 GPac Installation Instructions 11/07-2
WARNING
SAFETY REQUIREMENTS
• If the information in these instructions are not followed exactly, a re, carbon monoxide
poisoning or explosion may result causing property damage, personal injury or loss of
life.
• Read all instructions carefully prior to beginning the installation. Do not begin installation
if you do not understand any of the instructions.
• Improper installation, adjustment, alteration, service or maintenance can cause property
damage, personal injury or loss of life.
• Installation and service must be performed by a qualied installer, service agency or the
gas supplier in accordance with these instructions and in compliance with all codes and
requirements of authorities having jurisdiction.
• Follow all safety codes.
Manufactured By:
Marvair® Division of AIRXCEL®, Inc.
P.O. Box 400 • Cordele, Georgia 31010
156 Seedling Drive • Cordele, Georgia 31015
[phone] • Fax [phone]
E-mail: [email protected] • Internet: www.marvair.com
AVERTISSEMENT
EXIGENCES POUR LA SÉCURITÉ
• Si les informations contenues dans ces instructions ne sont pas suivies exactement, il
peut en résulter un empoisonnement au monoxyde de carbone ou une explosion, causant
dommages, blessure ou mort.
• Lisez soigneusement toutes les instructions avant de commencer l'installation. Ne la
commencez pas si vous n'avez pas assimilé toutes ces instructions.
• Une mauvaise exécution d'installation, réglage, altération, intervention ou entretien peut
causer dégâts matériels et dommages corporels ou même mort.
• Installation et interventions doivent être effectuées par un installateur ou une agence de
dépannage qualiés, ou par le fournisseur de gaz en conformité avec toutes les normes
et exigences des autorités ayant juridiction en la matière.
• Respectez toutes les normes de sécurité.

2GPac Installation Instructions 11/07-2
This is the safety alert symbol . When you see this symbol on the GPac unit and in the instruction manuals
be alert to the potential for personal injury. Understand the signal word DANGER, WARNING and CAUTION.
These words are used to identify levels of the seriousness of the hazard.
Failure to comply will result in death or severe personal injury and/or property
damage.
Failure to comply could result in death or severe personal injury and/or property
damage.
Failure to comply could result in minor personal injury and/or property
damage.
IMPORTANT is used to point out helpful suggestions that will result in improved installation, reliability or
operation.
Voici le symbole d'alerte concernant la sécurité . Quand vous le voyez sur l'unité GPac et dans les manuels
d'instructions, soyez conscient du risque de blessure personnelle. Assimilez la signication des mots de mise
en garde DANGER, AVERTISSEMENT et ATTENTION. Ils sont utilisés pour qualier les niveaux de gravité
du risque.
La non-observation entraînera des blessures graves voire mortelles et/ou
des dégâts matériels.
La non-observation pourrait entraîner des blessures graves voire
mortelles et/ou des dégâts matériels.
La non-observation pourrait entraîner des blessures et/ou des dégâts
matériels mineurs.
IMPORTANT est utilisé pour mettre en évidence des suggestions utiles qui peuvent améliorer installation,
abilité ou fonctionnement.
!WARNING
!CAUTION
!DANGER
!AVERTISSEMENT
!ATTENTION
!DANGER

3GPac Installation Instructions 11/07-2
Chapter 1 Safety Requirements..............................................................................1
Chapter 2 Start-Up Check List................................................................................4
Chapter 3 Model ID & Serial Number Explanation.................................................. 5
Chapter 4 Safe Installation Requirements ..............................................................5
4.1 Safety Rules .................................................................................. 6
Chapter 5 Installation..............................................................................................8
5.1 Location & Clearances ..................................................................8
5.2 Installation Requirements.............................................................. 9
5.3 Dimensional Data........................................................................ 11
5.4 Equipment Inspection.................................................................. 13
5.5 Clearances ..................................................................................13
5.6 Installation Materials ................................................................... 13
5.7 Porting & Ductwork .....................................................................13
5.8 General Information .................................................................... 15
5.9 Wall Openings .............................................................................15
5.10 Minimum Air Flow Requirements ................................................15
5.11 Ducting ........................................................................................15
5.12 Hanging the AVG Unit on the Wall ..............................................16
5.13 Gas Supply & Piping ...................................................................17
5.14 Gas Supply Requirements ..........................................................17
5.15 Gas Piping Requirements ...........................................................17
5.16 Electrical Connections.................................................................20
5.17 Venting of the Furnace ................................................................24
5.18 Installation of the Vent Hood .......................................................24
Chapter 6 Checks & Adjustments ......................................................................... 25
6.1 Gas Supply Pressure ..................................................................25
6.2 Manifold Gas ............................................................................... 25
6.3 Natural Gas Input ........................................................................ 27
 6.4 OriceSizing ...............................................................................27
6.5 LP Gas Conversion .....................................................................27
6.6 High Altitude Installation..............................................................30
 6.7 ChangingtheOrice ...................................................................31
6.8 Main Burner Flame...................................................................... 31
6.9 Temperature Rise Range ............................................................32
Chapter 7 General Description ............................................................................. 32
7.1 Cooling Mode .............................................................................. 33
7.2 Heating Mode..............................................................................35
7.3 Ventilation Options ......................................................................36
7.4 Economizer Operation ................................................................ 36
Table of Contents

4GPac Installation Instructions 11/07-2
START-UP CHECK SHEET
(Keep this page for future reference)
Dealer Name:
Address:
City/State/Zip:
Phone:
Business Card Here
Owners Name: Manual Gas Shut-Off Upstream of Furnace/Drip-Leg?
Address: YES NO
City/State/Zip: Drip-Leg Upstream of Gas Valve? YES NO
Model Number: AVG Blower Speed Check? YES NO
Serial Number: All Electrical Connections Tight? YES NO
Type of Gas: Natural LP Gas Valve OK? YES NO
Blower Motor HP: Measured Line Pressure When Firing Unit:
Supply Voltages: Gas Input Rating Check:
Limit Opens at: _____°F or _____°C (See Checks and Adjustments section)
Limit Closes at: _____°F or _____°C Measured Manifold Pressure:
Temperature of Supply Air: _____°F or _____°C Thermostat OK? YES NO
Temperature of Return Air: _____°F or _____°C Sub-Base Level? YES NO
Rise (Supply Temp. – Return Temp.): _____°F or _____°C Anticipator Set? YES NO Set At?
Filter Type and Size: Breaker On? YES NO
Fan “Time ON” Setting: Date of Installation:
Fan “Time OFF” Setting: Date of Start-up:
Dealer Comments:
Chapter 2 Start-Up Check List

5GPac Installation Instructions 11/07-2
Chapter 3 Model ID & Serial Number Explanation
Chapter 4 Safe Installation Requirements
WARNING
FIRE, EXPLOSION AND ASPHYXIATION HAZARD
Improper adjustment, alteration, service, maintenance or installation could cause serious
injury, death and/or property damage.
Installation or repairs made by unqualied persons could result in hazards to you and
others. Installation MUST conform with local codes or, in the absence of local codes, with
codes of all governmental authorities have jurisdiction.
The information contained in this manual is intended for use by a qualied service agency
that is experienced in such work, is familiar with all precautions and safety procedures
required in such work, and is equipped with the proper tools and test instruments.
AVERTISSEMENT
DANGER D'INCENDIE, EXPLOSION OU ASPHYXIE
Une mauvaise exécution d'installation, réglage, altération, intervention ou entretien peut
causer dégâts matériels et dommages corporels ou même mort.
Une installation ou des réparations faites par des personnes non qualiées peuvent
entraîner des dangers pour vous et les autres. L'installation DOIT être faite en conformité
avec les normes locales, ou en leur absence avec les normes des autorités nationales
ayant juridiction en la matière.
Les informations contenues dans ce manuel sont prévues pour être utilisées par une
agence de dépannage qualiée, ayant de l'expérience dans ce type de travaux, familière
avec les précautions et procédures de sécurité que cela implique, et équipée des outils et
instruments de test adéquats.
NOTE: This furnace is design-certied by the CSA International (formerly AGA and CGA) for installation in
the United States and Canada. Refer to the appropriate codes, along with this manual, for proper installation.
Air Source
Vertical
Gas
Nominal Cooling
24 = 24,000 BTUH
30 = 30,000 BTUH
36 = 36,000 BTUH
42 = 41,500 BTUH
48 = 48,000 BTUH
60 = 55,000 BTUH
System Type
Air Conditioner
Power Supply
A = 208/230V, 1ø, 60Hz
C = 208/230V, 3ø, 60Hz
D = 460V, 3ø, 60Hz
Ventilation Configuration
N = 0-15% fresh air with manual damper, no pressure relief.
Y = 0 to 450 cfm of outside air, field adjustable, manual damper, no
pressure relief.
Z = 0 to 450 cfm of outside air, field adjustable, manual damper,
includes pressure relief.
B = Motorized two position damper (open & closed) capable of 0 to
450 cfm of outside air, includes pressure relief.
C = Economizer; capable of 100% of rated cooling capacity using
outside air.
H = GreenWheel®energy recovery ventilator
Heating Input (MBTUH)
045 = 45,000 BTUH
067 = 67,000 BTUH
090 - 90,000 BTUH
075 = 75,000 BTUH
100 = 100,000 BTUH
125 = 125,000 BTUH
Model Identication
AVG • AC • •• •
Serial Number Date Code
A = January E = May J = September L = 2000 R = 2004 V = 2008
B = February F = June K = October M = 2001 S = 2005 W = 2009
C = March G = July L = November N = 2002 T = 2006
D = April H = August M = December P = 2003 U = 2007

6GPac Installation Instructions 11/07-2
• Use only the Type of gas approved for this furnace (see Rating Plate on unit). Overring will result in
failure of heat exchanger and cause dangerous operation. (Furnaces can be converted to LP gas with
approved kit.)
• Install this furnace only in a location and position as specied in the Installation Requirements section of
these instructions.
• Provide adequate combustion and ventilation air to the furnace as specied in Venting the Furnace section
of these instructions. Vent this furnace only as specied in Venting the Furnace.
• The AVG air conditioner with gas heat is only to be installed on the exterior of a building.
• Never test for gas leaks with an open ame. Use a commercially available soap solution made specically
for the detection of leaks to check all connections, as specied in Gas Supply and Piping, Final Check
check of these instructions.
• Always install furnace to operate within the furnace's intended temperature rise range with a duct system
which has an external static pressure within the allowable range, as specied in Porting and Ductwork
section of these instructions and on the data plate.
• Supply ducts and the return air shall be handled by a duct(s) sealed to the furnace casing as specied in
Porting and Ductwork.
• Seal around supply and return air ducts.
• Install correct lter type and size.
4.1 Safety Rules
Your unit is built to provide many years of safe and dependable service providing it is properly installed and
maintained. However, abuse and/or improper use can shorten the life of the unit and create hazards for you, the
owner.
A. The U.S. Consumer Product Safety Commission encourages installation of carbon monoxide alarms.
There can be various sources of carbon monoxide in a building or dwelling. The sources could be gas-
red clothes dryers, gas cooking stoves, water heaters, furnaces, gas-red replaces, wood replaces, and
several other items.
Carbon monoxide can cause serious bodily injury and/or death. Carbon monoxide or "CO" is a colorless
and odorless gas produced when fuel is not burned completely or when the ame does not receive
sufcient oxygen.
Therefore, to help alert people of potentially dangerous carbon monoxide levels, you should have a
commercially available carbon monoxide alarm that is listed by a nationally recognized testing agency
in accordance with Underwriters Laboratores, Inc. Standard for Single and Multiple Station Carbon
Monixide Alarms, ANSI/UL 2034 or the CSA 6.19-01 Residential Carbon Alarming Devices installed
and maintained in the building or dwelling concurrently with the gas-red furnace installation (see
Note below). The alarm should be installed as recommended by the alarm manufacturer's installation
instructions.
B. There can be numerous sources of re or smoke in a building or dwelling. Fire or smoke can cause serious
bodily injury, death and/or property damage. Therefore, in order to alert people of potentially dangerous
re or smoke, you should have re extinguisher and smoke alarms listed by Underwriters Laboratories
installed and maintained in the building or dwelling (see note below).
NOTE: Marvair does not test any alarms and makes no representations regarding any brand or type of
alarms.
C. To ensure safe and efcient operation of your unit, you should do the following:
1. Thoroughly read this manual and labels on the unit. This will help you understand how your unit

7GPac Installation Instructions 11/07-2
operates and the hazards involved with gas and electricity.
2. Do not use this unit if any part has been under water. Immediately call a quality service agency to
inspect the unit and to replace any part of the control system and any gas control which has been under
water.
3. Never obstruct the vent grilles, or any ducts that provide air to the unit. Air must be provided for
proper combustion and ventilation of ue gases.
WARNING
FROZEN AND BURST WATER PIPE HAZARD
Failure to protect against the risk of freezing could result in property damage and/or
personal injury.
Do not leave the structure unattended for long periods during freezing weather without
turning off water supply and draining water pipes or otherwise protecting against the risk
of frozen pipes and resultant damage.
AVERTISSEMENT
DANGER DE GEL ET D'ÉCLATEMENT DES CONDUITES D'EAU
Le manque de protection contre le risque de gel peut entraîner des dégâts matériels et/ou
des blessures corporelles.
Ne laissez pas la structure sans surveillance durant de longues périodes à la saison où
il peut geler sans avoir auparavant coupé toutes les alimentations en eau et vidangé les
conduites d'eau, ou bien protégez les conduites contre le gel et les dommages qui peuvent
en résulter..
Your furnace is designed solely to provide a safe and comfortable living environment. The furnace is NOT
designed to ensure that water pipes will not freeze. It is equipped with several safety devices that are designed
to turn the furnace off and prevent it from restarting in the event of various potentially unsafe conditions.
If your furnace remains off for an extended time, the pipes in the structure could freeze and burst, resulting in
serious water damage.
If the structure will be unattended during cold weather, you should take these precautions:
1. Turn off the water supply to the structure and drain the water lines if possible and add an antifreeze for
potable water to drain traps and toilet tanks. Open faucets in appropriate areas.OR
2. Have someone check the structure frequently during cold weather to make sure it is warm enough to
prevent pipes from freezing. Instruct them on a service agency to call to provide service if required.OR
3. Install a reliable remote sensing device that will notify somebody of freezing conditions within the
structure.
D. Important Safety Precautions
WARNING
1. TURN ELECTRICAL POWER OFF AT THE breaker or fuse box BEFORE installing or working on
the equipment. LINE VOLTAGES ARE HAZARDOUS or LETHAL.
AVERTISSEMENT
1. COUPEZ L'ALIMENTATION ÉLECTRIQUE, au niveau du disjoncteur ou du fusible en
amont, AVANT l'installation de cet équipement ou une intervention dessus. LES TENSIONS
D'ALIMENTATION SECTEUR SONT DANGEREUSES OU MORTELLES.

8GPac Installation Instructions 11/07-2
2. USE CARE when LIFTING or TRANSPORTING equipment.
3. TRANSPORT the UNIT UPRIGHT. Laying it down on its side may cause oil to leave the compressor or
other problems, resulting in DAMAGE upon START-UP.
4. OBSERVE and COMPLY with ALL applicable PLUMBING, ELECTRICAL, and BUILDING CODES &
ordinances.
5. SERVICE may be performed ONLY by QUALIFIED and EXPERIENCED PERSONS.
* Wear safety goggles when servicing the refrigeration circuit
* Beware of hot surfaces on refrigerant circuit components.
* Beware of sharp edges on sheet metal components
* Use care when reclaiming or adding refrigerant.
6. Use COMMON SENSE - BE SAFETY CONSCIOUS.
Chapter 5 Installation
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to properly vent this furnace or other appliances could result in death, personal
injury and/or property damage.
If this furnace is replacing a previously common-vented furnace, it may be necessary to
resize the existing vent system to prevent oversizing problems for the other remaining
appliance(s). See Venting the Furnace section of this instruction.
AVERTISSEMENT
DANGER D'EMPOISONNEMENT AU MONOXYDE DE CARBONE
Un défaut de ventilation pour cette chaudière ou d'autres appareils peut causer la mort, des
dommages corporels et/ou des dégâts matériels.
Si cette chaudière remplace une chaudière précédente à ventilation partagée, il pourra être
nécessaire de redimensionner le système de ventilation existant pour éviter des problèmes
de surdimensionnement au niveau du ou des autres appareils. Reportez-vous à la section
Ventilation de la chaudière dans ce manuel d'instructions.
5.1 Location and Clearances
Choose the location or evaluate the existing location based upon the minimum clearance and furnace
dimensions.
MODEL
Min. Clearance
From the Front
Min. Clearance
Around Both
Sides
Min. Clearance
Above the Unit
Min. Clearance
Below the Unit)
Min. Clearance
Around the Flue
Vent or Pipe
AVG24/30/36 36" 19" 2" 0" 18"
AVG42/48/60 36" 19" 2" 0" 18"
Table 1. Minimum Clearances from Unprotected Combustible Material and For Service

9GPac Installation Instructions 11/07-2
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow safety warnings could result in serious injury, death, or property damage.
Do NOT operate furnace in a corrosive atmosphere containing chlorine, ourine or any
other damaging chemicals which could harm the furnace and vent system, and permit
spillage of combustion products into an occupied space.
Refer to Venting the Furnace section, contaminated combustion air for combustion air
evaluation and remedy.
AVERTISSEMENT
DANGER D'EMPOISONNEMENT AU MONOXYDE DE CARBONE
La non-observation des AVERTISSEMENTS de sécurité peut causer des blessures graves
ou mortelles ou des dégâts matériels.
NE faites PAS fonctionner la chaudière dans une atmosphère corrosive contenant chlore,
uor ou tout produit chimique détériorant qui pourrait attaquer la chaudière et le système
de ventilation, et permettre le déversement de produits de combustion dans un lieu habité.
Reportez-vous à la section Ventilation de la chaudière, air de combustion contaminé, pour
une évaluation de l'air de combustion et les remèdes s'il y a lieu.
5.2 Installation Requirements
1. Install furnace level.
2. Install the vent pipes as short as practical. (See Venting the Furnace section).
3. Maintain clearance for re safety and servicing. See Table 1 for minimum clearances.
4. Furnace must be located or physically protected from possible damage by a vehicle.
5. When the unit is installed on a new building, make sure that:
a. The air temperature rise is within the rated rise range on the furnace rating plate, and the ring rate has
been set to the rating plate value.
b. The lters used to clean the circulating air during the construction process must be either changed or
thoroughly cleaned prior to occupancy.
c. The furnace, ductwork and lters are cleaned as necessary to remove drywall duct and construction
debris from all HVAC system components after construction is completed.
d. Verify proper furnace operating conditions including ignition, gas input rate, and venting according to
these installation instructions.
6. The AVG wall mounted air conditioner with gas heat furnace is designed to be installed on the
EXTERIOR wall of a building. Do NOT install this unit in an interior space.
7. The AVG unit is not certied or suitable for use in drying or process applications. Use in such applications
voids any warranty and Marvair disclaims any responsibility for the duct furnace and/or application.
8. The AVG unit is not designed for use in hazardous atmospheres containing ammable vapors or
combustible dust, in atmospheres containing chlorinated or halogenated hydrocarbons, or in applications
with airborne substances containing silicone.
9. The presence of chlorine vapors in the combustion air supply to gas red heaters presents a substantial
corrosion hazard.

10 GPac Installation Instructions 11/07-2
10. The use and storage of gasoline or other ammable vapors and liquids in the vicinity of the AVG unit is
hazardous.
11. Install the unit so that the least amount of noise will be transmitted to the living spaces.
12. Condensate is produced during the cooling cycle. This condensate must be disposed of to a suitable
location.
13. In the cooling mode, condenser air is drawn in through the sides of the unit and discharged through the
coil in the front of the unit. Both the intake and exhaust air must not be impeded or restricted by shrubbery
or any other obstructions.
14. The power supply must have the appropriate voltage, phase and ampacity for the model selected. Refer to
the data plate on the unit for ampacity requirements. Voltage must be maintained above minimum levels
and below maximum levels shown below.
Table 2. Electrical Rating Designations
15. The AVG air conditioner with gas heat may be used for heating and cooling in buildings under
construction provided that ALL installation procedures described in this manual are followed including,
but not limited to:
a. The unit must be properly vented,
b. The unit must be controlled by a thermostat,
c. The return air duct must be sealed to the unit,
d. The air lters must be in place,
e. The input rate and the temperature rise must be within the range shown on the data plate on the unit,
f. The unit must be installed on the exterior of the building for providing outdoor air for combustion, and
g. Return air temperature between 55°F (13°C) and 80°F (27°C)
Upon the completion of the construction process, the unit, duct work and components must be cleaned and
the proper operation of the furnace veried including ignition, input rate, temperature rise and venting as
described in this manual.
Electrical Rating Designations* A C D
Nominal Voltage 208/230 208/230 460
Phase 1 3 3
Minimum Voltage 197 197 414
Maximum Voltage 253 253 506
* Letters refer to model number code designations. Refer to page 4..

11 GPac Installation Instructions 11/07-2
5.3 Dimensional Data
.6250
4.5625
9.8125
5.5313
40.5
2.5
1.0625
9.8125 9.8125 9.8125
9.8125 9.8125 9.8125
AVG 24/30/36
Figure 1a. AVG Models 24/30/36 Dimensional Data

12 GPac Installation Instructions 11/07-2
Figure 1b. AVG Models 42/48/60 Dimensional Data

13 GPac Installation Instructions 11/07-2
5.4 Equipment Inspection
Concealed Damage
Inspect all cartons and packages upon receipt for damage in transit. Remove cartons and check for concealed
damage. Important: Keep the unit upright at all times. Remove access panels and examine component parts.
(Note: The top (optional) and bottom brackets are stored in the condenser air compartment. Remove them
before replacing the side screen). Inspect refrigerant circuit for fractures or breaks. The presence of refrigerant
oil usually indicates a rupture. If damage is apparent, immediately le a claim with the freight carrier.
Units that have been turned on their sides or tops may have concealed damage to compressor motor mounts, to
the oil system or to other components. If the unit is not upright, immediately le a claim for concealed damages
and follow these steps:
1. Set unit upright and allow to stand for 24 hours with primary power turned on.
2. Attempt to start the compressor after 24 hours.
3. If the compressor will not start, makes excessive noise, or will not operate, return the unit to the freight
carrier.
General
1. Inspect unit for completeness. Check for missing parts (e.g. hardware). Refer to the installation kit
information in section 5.6, Installation Kits.
2. Remove access panels and check for loose wires. Tighten screw connections.
3. Complete and mail the warranty registration card.
5.5 Clearances
The sides and front of the unit must be kept free of any obstructions or anything that impedes or restricts the
movement of intake or exhaust air. Follow local codes.
WARNING
CARBON MONOXIDE, FIRE OR EXPLOSION HAZARD
Failure to have the minimum clearances could result in severe personal injury or death.
AVERTISSEMENT
DANGER DE MONOXYDE DE CARBONE, D'INCENDIE OU D'EXPLOSION
Ne pas respecter les écartements minimum peut entraîner des blessures graves voire
mortelles.
Table 3. Minimum Clearances from Unprotected Combustible Material and For Service
After the unit has been installed, make sure that the unit is level.
5.6 Installation Materials
Installation Kits
The GPac air conditioners with gas furnace have built-in mounting anges that function as side brackets. All
models require and are shipped with a bottom mounting bracket. There is also an air intake hood packed inside
each unit and a vent hood.
MODEL
Min. Clearance
From the Front
Min. Clearance
Around Both
Sides
Min. Clearance
Above the Unit
Min. Clearance
Below the Unit)
Min. Clearance
Around the Flue
Vent or Pipe
AVG24/30/36 36" 19" 2" 0" 18"
AVG42/48/60 36" 19" 2" 0" 18"

14 GPac Installation Instructions 11/07-2
Standard Kit Components
1. One 12 Ga. “L”-shaped bottom bracket
The package may include other factory-supplied items (optional ) listed below and on the following page:
Part # Description
Thermostats
50121 Digital thermostat. 1 stage heat, 1 stage cool. Non-programmable. Fan switch: Auto & On. Manual
changeover system switch: Cool-Off-Heat. Low temperature protection. °F or °C.
50123 Digital thermostat. 1 stage heat, 1 stage cool. 7 day programmable. Fan switch: Auto & On. Auto-change
over. Keypad lockout. Non-volatile program memory. Title 24 compliant - no batteries needed.
50124 Digital thermostat. 1 stage heat, 1 stage cool. 7 day programmable. Fan switch: Auto & On. Manual
changeover system switch. LCD display. Title 24 compliant - no batteries needed.
50100 Seven day programming. Two occupied and two unoccupied periods per day. Individual heat and cool
setpoints. Manual or automatic changeover. System switch: Off, Cool, Heat, Emergency Heat. Fan
Switch: Auto & On. Keypad lockout available. Ventilation terminals. No batteries required. Display
indicates when Auxiliary Heat or Emergency Heat are activated. Requires a 50101 sub-base if used on
a heat pump or a 50109 if used on an air conditioner.
70076 Internal Thermostat - Factory Installed 1 Stage Heat, 1 Stage Cool with Auto Changeover, Eliminates
need for External Wall Mount T’Stat and Sub-Base.
50092 Thermostat Guard. For use with the 50107, 50122, 50121, 50123 and 50124.
Supply Grilles
80675 28 x 8" Adjustable, Aluminum, Double Deection Supply Grille for AVG 24-30-36
80676 30 x 10" Adjustable, Aluminum, Double Deection Supply Grille for AVG 42-48-60
Return Grilles
80678 28 x 14" Aluminum Return Grille for AVG 24-30-36
80679 30 x 16" Aluminum Return Grille for AVG 42-48-60
Additional Items Needed:
Additional hardware and miscellaneous supplies (not furnished by Marvair®) are needed for installation. For
example, the list below contains approximate quantities of items typically needed for mounting a unit on a wood
frame wall structure with standard full length mounting bracket or anges. Concrete or berglass structures have
different requirements.
(10) 3/8" mounting bolts or lag screws for side brackets and anchors, if required for side brackets.
(20) 3/8" washers
(10) 3/8" hex nuts
(6) 3/8" x 2-1/2" lag screws for bottom bracket
• Silicone Sealer to seal around cracks and openings
• 7-conductor low voltage multi-colored wire cable (i.e. thermostat wire)
• Appropriate electrical supplies such as conduit, electrical boxes, ttings, wire connectors, etc.
• High voltage wire, sized to handle the MCA (minimum circuit ampacity) listed on the data plate.
• Over-Current Protection Device sized in accordance with the MFS (maximum fuse size) listed on
the unit data plate.
Duct materials usually are also needed in addition to the mounting hardware. To save time, design the duct
work before mounting the unit.

15 GPac Installation Instructions 11/07-2
5.7 Porting and Duct Work
WARNING
FIRE AND CARBON MONOXIDE POISONING HAZARD
Failure to properly install the duct work could result in death, bodily injury and/or property
damage. In each installation, the duct system must be properly engineered and installed
to insure sufcient air ow to prevent overheating. All units must have at least one inch
clearance on all four sides of the supply outlet duct ange on the unit. The minimum one
inch clearance must extend on all sides of the supply duct for the rst three feet from the
unit.
AVERTISSEMENT
DANGER D'INCENDIE ET D'EMPOISONNEMENT AU MONOXYDE DE CARBONE
Une installation incorrecte de la tuyauterie peut entraîner mort, blessure corporelle et/ou
dégâts matériels. Sur chaque installation le système de conduites doit être bien calculé et
installé, an d'assurer un ux d'air sufsant évitant la surchauffe. Toutes les unités doivent
avoir au moins 2,5 cm de dégagement sur les quatre côtés de la bride de sortie de conduite
d'amenée sur l'unité. Ce minimum de 2,5 cm doit s'étendre de tous les côtés de la conduite
d'arrivée sur ses premiers 90 cm en partant de l'unité.
5.8 General Information
Note: The following instructions are for general guidance only. Due to the wide variety of installation possibilities,
specic instructions will not be given. When in doubt, follow standard and accepted installation practices, or
contact Marvair® for additional assistance.
5.9 Wall Openings
Measure the dimensions of the supply and return openings on the GPac A/C.
Cut the supply opening in the exterior wall for the supply and return. IMPORTANT: All units must have at
least one inch clearance on all four sides of the supply outlet duct ange on the unit. The one inch clearance
must extend on all sides of the supply duct for the rst three feet from the unit. The duct must be constructed
of galvanized steel with a minimum thickness of .019".
5.10 Minimum Airow Requirements
The duct system must be engineered to assure sufcient air ow through the AVG air conditioner with gas heat,
even under adverse conditions such as dirty lters, etc. Proper engineering will insure longevity and maximum
performance from the AVG unit.
5.11 Ducting
Extensions should be cut ush with the inside wall for applications without duct work.
Applications using duct work should be designed and installed in accordance with all applicable safety codes
and standards. Marvair® strongly recommends referring to the current edition of the National Fire Protection
Association Standards 90A and 90B before designing and installing duct work. The duct system must be engineered
to insure sufcient air ow through the unit to prevent over-heating. This includes proper supply duct sizing,
sufcient quantity of supply registers, adequate return and lter area. Ductwork must be of correct material and
must be properly insulated. Ductwork must be constructed of galvanized steel with a minimum thickness of
.019". Ductwork must be rmly attached, secured and sealed to prevent air leakage. Do not use duct liner on
inside of supply duct within four feet of the unit.
Galvanized metal duct extensions should be used to simplify connections to duct work and grilles. Use fabric
boots to prevent the transmission of vibration through the duct system. The fabric must be U.L. rated (UL-181)
to a minimum of 197oF.

16 GPac Installation Instructions 11/07-2
5.12 Hanging the AVG Unit on the Wall
1. Remove and discard the 4 x 4 shipping boards attached to the base of the unit.
2. The AVG models have built-in mounting anges. See Figure 2.
3. Refer to Figure 2. Attach the bottom support bracket to the wall using appropriate 3/8" diameter
hardware.
For example, on wooden structures, use 3/8 x 2-1/2 inch all-thread lag screws. The screws must penetrate the
center of the wall stud. Drill a pilot hole in the stud to prevent it from splitting.
Figure 2. Mounting Unit on Wall
4. For wiring into the back of unit, locate the lower of the two knock-outs on the wall side of the GPac unit.
Drill a one inch hole in the building wall to match this opening. Allow sufcient clearance to run 3/4"
conduit through the hole and to the unit.
5. Apply a bead of silicone sealer on the wall side of the mounting brackets on the GPac A/C. Circle the
mounting holes with the silicone bead.
6. Using an appropriate and safe lifting device, set the GPac A/C on the bottom support bracket mounted
on the wall. You must stabilize the unit on the bracket with the lifting device or by some other means - the
bracket alone is not sufcient.
7. Make sure that the duct anges are properly aligned with the wall opening. Adjust as necessary.
8. Note the holes in each side bracket. Using the holes for guides, drill holes through the wall with a 3/8
inch drill bit. Insert the 3/8" bolts or lag screws through the brackets. Tighten the bolts to secure the unit.
9. Apply a bead of silicone where the top ange and side brackets contact to the structure wall.
10. Fasten the top ange to the wall using #10 x 1/2 inch sheet metal screws.
11. On the inside of the structure, wall sleeves must be installed in the supply and return air openings. The
sleeves should be trimmed to t ush with the inside wall.
12. Check the t of each sleeve to its mating ange for possible air leaks. Apply silicone sealer to close any
gaps. Install the air return and supply grilles.

17 GPac Installation Instructions 11/07-2
5.13 Gas Supply and Piping
WARNING
CARBON MONOXIDE, FIRE AND EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death and/or
property damage.
Models designated for Natural Gas are to be used with Natural Gas ONLY, unless properly
converted to use with LP gas.
AVERTISSEMENT
DANGER DE MONOXYDE DE CARBONE, D'INCENDIE OU D'EXPLOSION
Ne pas respecter exactement les AVERTISSEMENS de sécurité peut causer des dommages
corporels graves ou mortels et/ou des dégâts matériels.
Les modèles conçus pour du gaz naturel ne doivent fonctionner qu'avec ce gaz
UNIQUEMENT, sauf s'ils ont été convertis dans les règles pour utiliser du gaz propane (LP).
5.14 Gas Supply Requirements
• Use only the type of gas approved for this furnace. See rating plate for approved gas type.
• Gas input must not exceed the rated input shown on the rating plate. Overring will result in failure of
heat exchanger and cause dangerous operation.
• Do not allow minimum supply pressure to vary downward. Doing so will decrease input to furnace. Refer
to Table 4 for gas supply pressure. Refer to Section 6.2 Gas Manifold Pressure Adjustments.
Table 4.Gas Pressures
5.15 Gas Piping Requirements
NOTE: The gas supply line must be installed by a qualied service technician in accordance with all building
codes.
NOTE: In the state of Massachusetts.
a. Gas supply connections MUST be performed by a licensed plumber or gas tter.
b. When exible connectors are used, the maximum length shall not exceed 36" (915 mm).
c. When lever handle type manual equipment shutoff valves are used, they shall be T-handle valves.
1. Install gas piping in accordance with local codes, or in the absence of local codes, the applicable national
codes.
2. It is recommended that a manual equipment shutoff valve be installed in the gas supply line outside the
furnace. Locate valve as close to the furnace as possible where it is readily accessible.
Gas Pressures
Supply Pressure
Gas Type Recommended Max. Min.
Natural 7" 14" 4.5"
Propane 11" 14" 11"

18 GPac Installation Instructions 11/07-2
WARNING
FIRE HAZARD
Failure to follow safety warnings exactly could result in serious injury, death and/or
property damage.
Use wrench to hold furnace gas control valve when turning elbows and gas line to prevent
damage to the gas control valve and furnace.
AVERTISSEMENT
DANGER D'INCENDIE
Ne pas respecter exactement les AVERTISSEMENTS de sécurité peut causer des
dommages corporels graves ou mortels et/ou des dégâts matériels.
Utilisez une clé pour maintenir la vanne de contrôle de gaz de la chaudière quand vous
tournez coudes ou conduite de gaz, an d'éviter d'endommager la vanne et la chaudière.
3. Use black iron or steel pipe and ttings or other pipe approved by local code.
4. Use pipe thread compound which is resistant to natural and LP gases.
5. Use ground joint unions and install a drip leg no less than 3" long to trap dirt and moisture before it can
enter gas control valve inside furnace.
6. Provide a 1/8" NPT plugged tapping for test gauge connection immediately up stream of gas supply
connection to furnace.
7. Use two pipe wrenches when making connections to prevent furnace gas control valve from turning.
NOTE: If local codes allow the use of a exible gas appliance connector, always use a new listed connector.
Do not use a connector which has previously serviced another gas appliance.
8. Flexible corrugated metal gas connector may NOT be used inside the furnace or be secured or supported
by the furnace or ductwork.
9. Properly size gas pipe to handle combined appliance load or run gas pipe directly from gas meter or LP
gas regulator.
10. Install correct pipe size for run lenght and furnace rating.
11. Measure pipe length from gas meter or LP second stage regulator to determine gas pipe size.
WARNING
FIRE OR EXPLOSION HAZARD
Failure to properly install metal gas connector could result in death, bodily injury and/or
property damage.
A exible corrugated metal gas connector must be properly installed, shall not extend
through the side of the furnace, and shall not be used inside the furnace.
Black iron pipe shall be installed at the furnace gas control valve and extend a minimum of
2" outside furnace.

19 GPac Installation Instructions 11/07-2
AVERTISSEMENT
DANGER D'INCENDIE OU D'EXPLOSION
Ne pas installer correctement le connecteur métallique du gaz peut causer des dommages
corporels graves ou mortels et/ou des dégâts matériels.
Un connecteur métallique de gaz exible ondulé doit être correctement installé, ne doit pas
dépasser du côté de la chaudière, et ne doit pas être utilisé à l'intérieur de la chaudière.
Un tuyau en fer noir doit être installé sur la vanne de contrôle du gaz de chaudière et
dépasser d'au moins 5 cm hors de la chaudière.
Additional LP Piping Requirements
• Have a licensed LP gas dealer make all connections at storage tank and check all connections from tank to
furnace.
• If copper tubing is used, it MUST comply with limitation set in local codes, or in the absence of local
codes, the gas codes of the country having jurisdiction.
• Two-stage regulation of LP gas is recommended.
WARNING
FIRE OR EXPLOSION HAZARD
A natural gas or LP gas leak ignited by an open ame or spark could result in death,
personal injury and/or property damage.
Natural gas is lighter than air and will rise. Liquidied petroleum (LP) gas is heavier than air
and will settle and remain in low areas and open depressions.
Thoroughly ventilate area and dissipate gas. DO NOT use a match or open ame to
test for leaks, or attempt to start up furnace before thoroughly ventilating area. Use a
commercially available soap solution made specically for the detection of leaks to check
all connections. A re or explosion may result causing property damage or loss of life.
AVERTISSEMENT
DANGER D'INCENDIE OU D'EXPLOSION
Une fuite de gaz naturel ou propane allumée par une amme nue ou une étincelle peut
causer des dommages corporels graves ou mortels et/ou des dégâts matériels.
Le gaz naturel est plus léger que l'air et va monter. Le gaz propane (pétrole liquéé)
est plus lourd que l'air et va descendre et s'accumuler dans les zones basses et les
dépressions ouvertes.
Ventilez complètement la zone. N'utilisez PAS d'allumette ou de amme nue pour chercher
des fuites, et n'essayez pas de démarrer la chaudière avant d'avoir bien ventilé la zone.
Utilisez une solution savonneuse disponible dans le commerce faites spécialement pour
vérier l'absence de fuite à tous les raccordements. Une fuite peut causer incendie ou
explosion, avec dégâts matériels et blessures mortelles.
Final Check of Gas Piping
• Test all pipes for leaks.
• If orices were changed, make sure they are checked for leaks.
• During pressure testing of gas supply piping system:

20 GPac Installation Instructions 11/07-2
a. If test pressure does not exceed 1/2" psi, isolate the furnace from the gas supply piping system by
closing the equipment shutoff valve.
b. If test pressure exceed 1/2" psi, the furnace and its manual equipment shutoff valve must be
disconnected from the gas supply piping system.
• To check for leaks apply soap suds or a liquid detergent to each joint. Bubbles forming indicate a leak.
• Do not use an open ame to test for gas leaks. Fire or explosion could occur.
• Correct even the smallest leak at once.
5.16 Electrical Connections
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow safety warnings exactly could result in serious injury, death, and/or
property damage.
Turn off electrical power at fuse box or service panel BEFORE making any electrical
connections and ensure a proper ground connection is made before connecting line
voltage.
AVERTISSEMENT
DANGER D'ÉLECTROCUTION
Ne pas respecter exactement les AVERTISSEMENTS de sécurité peut causer des
dommages corporels graves ou mortels et/ou des dégâts matériels.
Coupez l'alimentation électrique en amont au boîtier de fusibles ou au panneau de
distribution secteur AVANT d'effectuer des raccordements électriques, et assurez-vous
qu'une bonne liaison de terre est réalisée avant de brancher la tension d'alimentation
secteur.
The AVG air conditioner with gas furnace MUST be wired and grounded in accordance with electrical codes,
or in the absence of local codes, with the current editions of the National Electrical Code (NEC), ANSI/NRPA
70-2002 in the US. In Canada, follow the Canadian Electrical Code (CEC), C22.1 CSA.
The GPac air conditioner may incorporate an internal crankcase heater for compressor protection. The crankcase
heater must be energized for at least 24 hours prior to starting the compressor.
High Voltage Wiring
The power supply should have the proper voltage, phase, and ampacity for the selected model.
1. Refer to electrical data stamped on the unit rating plate for eld wiring requirements. The electrical data
lists heater sizes, fuse sizes, and wire sizes for all models. Also shown are the number for eld power
circuits required for the various modes with the electric heaters.
Each unit is marked with a “Minimum Circuit Ampacity”. This means that the eld wiring used must be
sized to carry that amount of current. Use “Copper Conductions Only”. Refer to the National Electrical
Code for complete current carrying capacity data on the various insulation grades of wiring materials.
Note: Power supply service must be within allowable range (+10% - 5%) of rated voltage stamped on the
unit rating plate. To operate nominal 230/208V unit at 208V, change the transformer line tap from
240V to 208V following the instruction on wiring label in unit.
2. Connect the wires to the input side of the internal breaker (L1 & L2 for single-phase units; L1, L2, & L3
for three phase models).