Marvair AVPA12-20-24-30-36-42-48-60 User manual

ModPac PDS 1/2013 Rev. 10
1
General Description
The Marvair®ModPac™ II air conditioner
is a vertical, wall mounted, cost effective air
conditioner designed for a variety of building types
and applications. The unit is manufactured in eight
sizes from 1 to 5 tons. Electric heat may be field
or factory installed. Disconnects are standard on
all units including the 460v. models. Accessories
include a full range of grilles and thermostats.
Cabinet color choices include standard Marvair
beige and grey as well as other options. A Marvair
first, the built-in mounting flanges simplifies
installation. The sloped top, another Marvair
original, eliminates the need for a rainhood.
Outside Air for Ventilation or
Free Cooling
A full range of accessories and options allows
the ModPac air conditioners to be optimized for
each application. For classrooms, a complete
range of ventilation options are available to meet the fresh
air requirements of the ASHRAE 62 standard. To insure
proper operation and optimum performance, all outside
air ventilation packages are non-removable and factory
installed.
Dehumidification
The introduction of outside air can cause humidity levels
to rise to unacceptable levels. To reduce humidity, ModPac
air conditioners can be ordered with electric resistance reheat or a Hot Gas
Reheat (HGR) coil. The HGR coil allows the air conditioner to dehumidify without
adversely lowering the temperature in the classroom and uses less energy than
electric reheat. See page 4 for a detailed description of the operation of the Hot
Gas Reheat Coil.
Safety Listed & Energy Certified
All ModPac air conditioners are built to UL standard 1995, 2nd edition and
CAN/CSA C22, No. 236-5, 2nd edition. For energy efficiency and performance,
the units are tested and rated in accordance to the ANSI/ARI (Air-Conditioning
and Refrigeration Institute) Standard 390- 2003 (Single Package Vertical Units).
All AVPA units meet or exceed the efficiency requirements of ANSI/ASHRAE/
IESNA 90.1.2007. The ModPac air conditioners are commercial units and are not
intended for use in residential applications.
Mo d Pac™ II 1 to 5-Ton Vertical
Wall Mount Air Conditioners
Models AVPA12-20-24-30-36-42-48-60
ModPac II PDS 1/2013 rev. 10

ModPac PDS 1/2013 Rev. 10
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M5 Configuration
The M5 configuration of the ModPac II air conditioner features the following as standard.
PC Board
Each ModPac air conditioner has a PC board that controls the operation of the indoor blower and
the compressor while providing high refrigerant pressure and low refrigerant protection. User
selectable pins and potentiometers permit multi-function control. LED’s indicate operational status
and fault conditions. A dedicated relay controls allows control of the two position motorized fresh
air damper (Ventilation Configurations “B” & “Z”).
LED Indicator Lights
COLOR TYPE STATUS DESCRIPTION
Green Power Constant On 24 VAC power has been applied
Red Status
Constant On Normal Operation
1 Blink High pressure switch has opened twice
2 Blinks Low pressure switch has opened twice
3 Blinks Freeze stat (optional) - indoor coil temperature is below 35°F (1°C)
Modes of Operation
Normal Start-up: On a call for cooling, and the with the high pressure switch closed, the cooling
system
(compressor, indoor blower motor and outdoor fan motor) will be energized. (Note: See the Delay
on Make feature). The cooling system will remain energized during the three minute low pressure
switch bypass cycle. If the low pressure is closed, the cooling system will continue to operate after
the three-minute bypass. If the low pressure switch is open after the three-minute bypass, the
cooling system will be de-energized.
Lockout Mode: If either the high or low pressure switch opens twice on the same call for cooling,
the control board enters into and indicates the lockout mode. In the lockout mode, the compressor
is turned off, the alarm output is energized and the status LED’s will blink to indicate which fault
has occurred. If there is a call for air flow, the indoor blower will remain energized. When the
lockout condition has cleared, the unit will reset if the demand of the thermostat is removed or
when power is reset. The lockout circuit is factory wired for normally open contacts. The user can
select either normally closed or normally open remote alarm dry contacts.
Delay on Make: On initial power up or on resumption of power, the air conditioner will wait .03 to
10 minutes from a call for cooling before allowing the contactor to energize.
In addition to the PC board, the M5 configuration has high and low refrigerant pressure switches
and foil backed insulation lines the indoor air path. A low ambient fan cycle control is available as
an option.
Ease of Installation
•Factoryinstalleddisconnectmayeliminate
need of outside disconnect.
•Built-inmountingflangeseliminateneedfor
side brackets.
•Slopedtopshedswaterandminimizes
chance of water leaks.
•Designedforinstallationinamodular
builder's facility.
•SinglePointPowerEntrycomplieswithlatest
edition of U.L. Standard 1995.
Attractive and Built for Long Term
Operation
•Choiceofcolors-beige,white,grey,light
brown.
•Decorativecoilguard.
•Highefficiencycompressorsprovidereliable
and quiet operation.
Ease of Service
•Serviceaccessvalves.
•Allcomponentsaccessibleforfieldservice.
•Nationwidenetworkofservicecenters.
Quiet
•Twinblowerssizedtoacceptfullduct
system.
•Highandlowrefrigerantswitches
•Highdensity,foilbackedinsulationcomplies
with codes that require a cleanable surface
for the indoor air path.
Standard Features

ModPac PDS 1/2013 Rev. 10
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Grilles & Thermostats
Grilles
Grilles for the AVPA12
Description Size Marvair P/N
DoubleDeection,AluminumSupplyGrille 17” x 5” (432mm x 127mm) 80682
Aluminum Return Grille 17” x 10” (432mm x 254mm) 92352
Return Filter Grille 17” x 10” (432mm x 254mm) 80683
Grilles for the AVPA20/24
DoubleDeection,AluminumSupplyGrille 20” x 8“ (509mm x 203mm) 80674
Aluminum Return Grille 20” x 12” (509mm x 305mm) 80677
Return Filter Grille 20” x 12” (509mm x 305mm) 80671
Grilles for AVPA30/36
DoubleDeection,AluminumSupplyGrille 28” x 8“ (711mm x 203mm) 80675
Aluminum Return Grille 28” x 14” (711mm x 356mm) 80678
Return Filter Grille 28” x 14” (711mm x 356mm 80672
Grilles for AVPA42/48/60
DoubleDeection,AluminumSupplyGrille 30” x 10“ (762mm x 254mm) 80676
Aluminum Return Grille 30” x 16” (762mm x 406mm) 80679
Return Filter Grille 30” x 16” (762mm x 406mm) 80673
Note:ReturnltergrillesshouldbeusedwhenthelterintheModPacunitisnotaccessiblefromtheexteriorofthebuilding.
Thermostats
Thermostat, P/N 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 selectable.
Thermostat, P/N 50123
Digital thermostat. 1 stage heat, 1 stage cool. 7 day programmable. Fan switch: Auto & On.
Auto-changeover. Keypad lockout. Non-volatile program memory. Title 24 compliant - no batteries
needed.
Thermostat, P/N 50218
Digital, non-programmable thermostat. One stage cool/One stage heat. Manual or auto
changeover. Fan mode: Auto or On. Permanent retention of settings upon power loss. Field
adjustable temperature calibration. Max heat and minimum cool set points. Adjustable temperature
differential. Remote sensor capable. Keypad lock out. Status LED. °F or °C selectable.
Thermostat, P/N 50246
Non-programmable, single stage heat, single stage cool. Manual changeover. Fan: Auto & On. 60
minute power back-up.
Thermostat, P/N 50289
Programmable 2-stage heat, 2-stage cool. System settings: Heat, Cool, Off, Auto-changeover. Fan
Auto & ON. 3-hour override and button lockout to prevent tampering.
Thermostat Guard, P/N 50092
For use with 50121, 50123 thermostats.
Digital humidity controller. P/N 50254
To be used with units with Hot Gas or Electric reheat. Programmable dehumidistat, humidistat
and ventilation control. Time of day can be set for dehumidifier, humidifier or ventilation to run.
Auto-changeover for humidification or dehumidification. Permanent memory retention of set
points. Humidity sensor can be field calibrated. High & low dehumidification set points. Outdoor
temperature and humidity sensor included. ºF or ºC selectable.
Choice of Colors
Beige is standard color with grey, white and light brown available.

ModPac PDS 1/2013 Rev. 10
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Outside Air for Ventilation
ASHRAE standard 62 requires 30 cfm of outside air per occupant of a classroom. To meet this
requirement, Marvair offers a variety of ventilation packages for every budget and requirement.
Note: if an air conditioner with an energy recovery ventilator (ERV) is desired, please see the
GreenPac Product Data Sheet. If an air conditioner with an economizer is desired, please see the
ComPac Product Data Sheet.
Outside Air Ventilation Schedule
Ventilation
Package
Designator*
Description Outside Air
Capability
Pressure
Relief Models
B
Motorized, two position damper (open
and closed) includes pressure relief.
A 24-volt actuated motor controls the
damper from an external input such
as a time clock, CO2 sensor, energy
management system or a manual switch
Up to 450 cfm, but not
to exceed 40% of the
ratedairowoftheair
conditioner.
Yes AVPA30-60
ZManualdamper,eldadjustable
Up to 450 cfm, but not
to exceed 40% of the
ratedairowoftheair
conditioner.
Yes AVPA30-60
YManualdamper,eldadjustable.
Up to 450 cfm, but not
to exceed 40% of the
ratedairowoftheair
conditioner
No AVPA30-60
NManual,xedpositiondamper 0-15%ofratedairow No All Models
*SeeModelIdenticationChart
Model Identification
AVP A • AC • ••• M5 • • • •••
Air Source
Vertical Package
Nominal Cooling
12 = 12,000 BTUH
20 = 20,000 BTUH
24 = 24,000 BTUH
30 = 29,000 BTUH
36 = 35,000 BTUH
42 = 42,000 BTUH
48 = 46,500 BTUH
60 = 56,000 BTUH
System Type
Air Conditioner
Power Supply
A = 208/230V,1ø,60Hz
C = 208/230V,3ø,60Hz
D = 460V,3ø,60Hz
Configuration
M5 =PC Board &
Square Cornered
Cabinet
Electric Heat – kW
000 = No Heat 080 = 8 kW
036 = 3.6 kW 090 = 9 kW
040 = 4 kW 100 = 10 kW
050 = 5 kW 120 = 12 kW
060 = 6 kW 150 = 15 kW
Ventilation Code
N = 0-15% fresh air with manual
damper, no pressure relief)
All Models
B = Motorized two position damper
(open & closed) capable of
0 to 450 cfm (up to 40% of
rated air flow) of outside air,
includes pressure relief) Models
AVPA30-60 only
Z = Manual damper, field adjustable
with pressure relief
Y = Manual damper, field adjustable,
no pressure relief
A = R410
Refrigerant
Special Option Code
U = Scroll Compressor
A1= PC Board
K = Coastal Environmental
Package
G = Hot Gas Reheat
R = Electric Reheat
Color Code
100 = Beige (std)
200 = Grey
300 = Brown
400 = White
A2 = Internal
Disconnect
Dehumidification
Two dehumidification configurations – Hot Gas Reheat and Electric Reheat - are available. Both
Hot gas Reheat and Electric Reheat require a humidity controller in addition to a thermostat for
proper operation.
Hot Gas Reheat
Marvair® air conditioners equipped with Hot Gas Reheat (HGR) allow the indoor humidity of the
controlled environment to be maintained at or below a certain humidity set point. These units do
not have the ability to add humidity to the classroom. Dehumidification is achieved by operating
mechanical cooling in conjunction with a hot gas reheat coil.

ModPac PDS 1/2013 Rev. 10
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Operation - If the humidity rises above the set point on the humidity controller and the
temperature in the classroom is satisfied, both mechanical cooling and the HGR coil operate to
temper the air and lower the humidity. If the temperature in the classroom rises above (or falls
below) the set point of the thermostat and the unit is operating in the dehumidification mode, the
call for cooling (or heating) will override the call for dehumidification and the coil is disengaged until
the thermostat is satisfied. This assures the environment temperature is maintained as first priority
and humidity control is second.
Electric Reheat
Allows the electric heat to operate simultaneously with cooling. See Dehumidification Application
Bulletin for details. Note: The electrical characteristics and requirements of air conditioners with
the dehumidification option are different from standard air conditioners. Refer to the appropriate
Summary Rating Charts for the electrical characteristics of units with Electric Reheat.
Accessories
Phase Monitor -• Monitors 3Ø power supply and will turn the air conditioner off if power supply is
not phased properly. Not required on 1Ø units.
Thermal Expansion Valve• - Available on all ModPac air conditioners. Improves operation in high
ambient temperatures, >110°F (43°C).
Compressor sound jackets• - Reduces sound of compressor
Dirty Filter Indicator• – Measures the pressure across the internal filter and illuminates a LED
when the pressure exceeds the specified difference. Not available on the AVPA12.
Security Cages• – Deters theft of the air conditioner and components. Constructed of 1” by 11
gauge square tube and ¾”, #9 expanded metal. Hinges and latches are constructed from steel
plate. The complete cage is powdered coated for longevity and to match the color of the air
conditioners cabinet. Field installed. Color is designated by the xxx suffix. See Model ID for color
code.
Model Part Number
AVPA12 01633-xxx
AVPA20/24 01634-xxx
AVPA30/36 01649-xxx
AVPA42/48/60 01669-xxx
Low ambient cooling (field installed)• – Allows the ModPac unit to operate in the cooling mode
down to 20°F (-7°C).
Wall mount adapter for the AVPA24• – To be used when upgrading from the old AVP24 or
AVPA24 cabinet with the chamfered corners to the new AVPA24 M5 cabinet. p/n K/03955
Special Application Packages and Coil Coatings
Coastal Environmental Package - Recommended for units to be installed near an ocean. Includes
corrosion resistant fasteners, sealed or partially sealed condenser fan motor, protective coating
applied to all exposed internal copper and metal in the condenser section and a protective coating
on the condenser coil. See Coastal Environmental Technical Bulletin for more details.
Protective Coil Coatings - Either the condenser or evaporator coil can be coated; however, coating
of the evaporator coil is not common. For harsh conditions, e.g., power plants, paper mills or
sites were the unit will be exposed to salt water; the coil should be coated with an impregnated
polyurethane coating. The coatings are sprayed on and pass 3,000 hours of B117 salt fog test.
Note: Cooling capacity may be reduced by up to 5% on units with coated coils.