Marvair ComPac II AVP48 User manual

Chapter 1 Description ...................................... 5

Chapter 2 Installation .................................... 18

Chapter 3 Start-Up ........................................

Chapter 4 Troubleshooting ............................ 32

Chapter 5 Maintenance .................................. 35

Chapter 6 Warranty ....................................... 36

Parts List & Exploded Views .............................. 38

ComPac

I and ComPac

Air Conditioner Product Manual

Vertical Wall-Mount Air Conditioners

with Front Control Box Panel

Models AVP24-30-36-42-48-60-72

P/81024 6/09-18

supersedes 10/07-17

Manufactured By:

Marvair

Division of AIRXCEL

, Inc.

P.O. Box 400 • Cordele, Georgia 31010

156 Seedling Drive • Cordele, Georgia 31015

(229) 273-3636 • Fax (229) 273-5154

E-mail: [email protected] • Internet: www.marvair.com

ComPac 6/09-18

How To Use This Manual

This manual is intended to be a guide to Marvair's ComPac

line of vertical air conditioners. It contains installation,

troubleshooting, maintenance, warranty, and application information. The information contained in this manual is to

be used by the installer as a guide only. This manual does not supersede or circumvent any applicable national or local

codes.

If you are installing the ComPac

unit, rst read Chapter 1 and scan the entire manual before beginning the installation

as described in Chapter 2. Chapter 1 contains general, descriptive information and provides an overview which can

speed up the installation process and simplify troubleshooting.

If a malfunction occurs, follow this troubleshooting sequence:

1. Make sure you understand how the ComPac

unit works (Chapters 1 & 3).

2. Identify and correct installation errors (Chapter 2).

3. Refer to the troubleshooting information in Chapter 4.

If you are still unable to correct the problem, contact the Factory at 1-800-841-7854 for additional assistance.

Please read the following “Important Safety Precautions” before beginning any work.

Important Safety Precautions

1. USE CARE when LIFTING or TRANSPORTING equipment.

2. TRANSPORT the UNIT UPRIGHT. Laying it down on its side may cause oil to leave the compressor and breakage

or damage to other components.

3. TURN ELECTRICAL POWER OFF AT THE breaker or fuse box BEFORE installing or working on the equipment.

LINE VOLTAGES ARE HAZARDOUS or LETHAL.

4. OBSERVE and COMPLY with ALL applicable PLUMBING, ELECTRICAL, and BUILDING CODES and ordi

nances.

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 recovering or adding refrigerant

Use COMMON SENSE - BE SAFETY-CONSCIOUS

This is the safety alert symbol . When you see this symbol on the ComPac 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.

Div. Airxcel

, Inc.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

DANGER

WARNING

CAUTION

ComPac 6/09-18

Table of ConTenTs

Chapter 1 ComPac

A/C Description & Specications

1.1 General Description .................................................................................................................................5

1.2 Model Identication .................................................................................................................................5

1.3 Serial Number Date Code ........................................................................................................................5

1.4 Ratings and Specications .......................................................................................................................6

1.5 General Operation ....................................................................................................................................9

1.6 Electronic Control Board Mode of Operation ........................................................................................10

1.7 Optional Controls ...................................................................................................................................12

1.8 Electrical Diagrams ................................................................................................................................13

1.9 Economizer Components .......................................................................................................................16

Chapter 2 Installation

2.1 Equipment Inspection .............................................................................................................................18

2.2 Installation Requirements .......................................................................................................................18

2.3 Installation Materials ............................................................................................................................19

2.4 Porting and Duct Work ..........................................................................................................................21

2.5 Fresh Air Hood Installation ...................................................................................................................22

2.6 Bracket Installation ...............................................................................................................................23

2.7 Mounting the Unit .................................................................................................................................23

2.8 Electrical Connections ...........................................................................................................................24

Chapter 3 Start-Up

3.1 Check-Out of Cooling Cycle .................................................................................................................30

3.2 Check-Out of Heating Cycle ..................................................................................................................30

3.3 A/C Testing with LL357D4 ....................................................................................................................31

Chapter 4 Troubleshooting

4.1 Overview ................................................................................................................................................32

4.2 Failure Symptoms Guide ........................................................................................................................32

4.3 Compressor Troubleshooting .................................................................................................................33

4.4 Control Board Diagnosis ........................................................................................................................34

WARNING

• If the information in these instructions are not followed exactly, a re 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 or service agency in

accordance with these instructions and in compliance with all codes and requirements

of authorities having jurisdiction.

INSTALLER: Afx the instructions on the inside of the building adjacent to the

thermostat.

END USER: Retain these instructions for future reference.

ComPac 6/09-18

Illustrations

Figure 1a. ComPac

I & II A/C Dimensions - Models 24-36 .................................................................. 7

1b. ComPac

I & II A/C Dimensions - Models 42-60 ................................................................... 7

1c. ComPac

I & II A/C Dimensions - Model 72 .......................................................................... 8

Figure 2. Refrigerant Circuit ................................................................................................................... 9

Figure 3a. Typical Electrical Schematic-ComPac

I A/C Models 24-72 w/ Electronic Control Board .. 14

3b. Typical Electrical Schematic-ComPac

II A/C Models 24-72 w/ Electronic Control Board 15

Figure 4. H205A Temperature Control Points ....................................................................................... 16

Figure 5. H205A Control Point Adjustment .......................................................................................... 17

Figure 6. Fresh Air Hood Installation .................................................................................................... 22

Figure 7. Wall Mounting Detail - ComPac

A/C AVP24-72 ................................................................. 23

Figure 8a. Thermostat Wiring Details ..................................................................................................... 27

Figure 8b. Thermostat Connection Diagram ........................................................................................... 28

Figure 8c. LL357D4 Wiring Detail ......................................................................................................... 28

Figure 8d. CommStat 3™ Wiring Detail ................................................................................................. 29

Tables

Table 1 CFM @ External Static Pressure ............................................................................................. 6

Table 2 Ship Weight .............................................................................................................................. 6

Table 3 Standard Filter Size .................................................................................................................. 6

Table 4 Minimum Clearances ............................................................................................................. 19

Table 5 Voltage Limitations ................................................................................................................ 19

Table 6 Maximum Static Pressure ...................................................................................................... 22

Table of ConTenTs

Chapter 5 Maintenance

5.1 Scheduled Maintenance .........................................................................................................................35

Chapter 6 Warranty

6.1 Limited Product Warranty ......................................................................................................................36

6.2 Optional Silver Service Program ...........................................................................................................

Parts List and Exploded Views .....................................................................................................................38

ComPac 6/09-18

1.1 General DesCripTion

Marvair's ComPac

lines are a series of vertical wall-mounted air conditioning systems that provide

heating, cooling, and ventilation for electronic equipment shelters, process control centers, and other

applications with high internal heat gains. The series includes multiple sizes and nominal cooling

capacities from 24,000 to 72,000 BTUH. Resistance heating elements are available in various watt-

ages.

Marvair’s ComPac

I & ComPac

II air conditioners, models AVP24-72, feature an exclusive electronic

control board. The control board consolidates several of the electrical components and improves the air

conditioner’s reliability. The control board replaces the blower relay, the lockout relay, the compressor

time delay and the timed low pressure bypass. In addition, the control board has LED’s to indicate

operating status and fault conditions to assist the service technician. A complete description of functions

of the control board is in Section 1.6.

The ComPac

I & ComPac

II models are designed for easy installation and service. Major components

are accessible for service beneath external panels.

All units have internal disconnects (optional on 460V). Depending upon state and local code require-

ments, this feature may eliminate the need for an external breaker or disconnect.

The ComPac

I A/C has a 0-15% manual outside air damper and the ComPac

II A/C has a factory

installed economizer for 100% free cooling with outside air.

1.2 Model Identication

The model identication number is found on the data sticker. Rating plate located on side panel.

Chapter 1 Description & Specications

1.3 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 Y = 2009

C = March G = July L = November N = 2002 T = 2006

D = April H = August M = December P = 2003 U = 2007

AVP ** AC * * * *

Air Source Vertical Package

*Ratings at 60 Hz.

Power Supply

A = 208/230V, 1ø, 60 Hz E = 380V, 3ø, 50 Hz

C = 208/230V, 3ø, 60 Hz F = 220V, 1ø, 50 Hz

D = 460V, 3ø, 60 Hz G = 220V, 3ø, 50 Hz

Electric Heat (kW)

00, 04, 05, 06, 08, 09, 10, 15

Conguration

N = ComPac

I A/C

C = ComPac

II A/C

System Type = Air Conditioner

Nominal Cooling*

24 = 24,000 BTUH 48 = 48,000 BTUH

30 = 29,400 BTUH 60 = 55,000 BTUH

36 = 35,000 BTUH 72 = 72,000 BTUH

42 = 41,500 BTUH

Special Option Code

R = Electric Reheat

U = Scroll Compressor

ComPac 6/09-18

1.4 Ratings & Specications

Table 1. CFM @ External Static Pressure (Wet Coil) (IWG)

Table 2. Ship Weight

Table 3. Filter Size

MODEL 0.10 0.20 0.25 0.30 0.40 0.50

24 860 810 740 670

30 1100 1000 960 920 810

36 1310 1220 1185 1150 1060

42 1650 1585 1520 1450 1360

48 1900 1830 1760 1700 1620

60 1900 1830 1760 1700 1620

72 2100 1950 1800 1730 1660

24 30/36 42 48 60 72

MODEL LBS/KG LBS/KG LBS/KG LBS/KG LBS/KG LBS/KG

COMPAC

I A/C 274/125 355/160 495/225 521/240 535/245 625/284

COMPAC

II A/C 286/130 365/170 527/240 552/250 565/260 640/290

MODEL 24 30/36 42/48/60 72

FILTER SIZE (inches) 16 x 25 x 2 16 x 30 x 2 22 x 36-1/2 x 2 18 x 24 x 2*

FILTER SIZE (mm) 406 x 635 x 51 406 x 762 x 51 559 x 927 x 51 452 x 610 x 51

*Two lters required.

ComPac 6/09-18

Figure 1b. ComPac

I A/C & ComPac

II A/C Dimensions- Models AVP42-60 (in inches)

Figure 1a. ComPac

I & ComPac

II A/C Dimensions- Models AVP20-36 (in inches)

ComPac 6/09-18

Figure 1c. ComPac

I A/C & ComPac

II A/C Dimensions- Models AVP72 (in inches & mm)

ComPac 6/09-18

1.5 General Operation

Refrigerant Cycle (Cooling Mode)

The ComPac

I & ComPac

II A/C use R-22 refrigerant in a conventional vapor-compression refrigera-

tion cycle to transfer heat from air in an enclosed space to the outside. A double blower assembly blows

indoor air across the evaporator. Cold liquid refrigerant passing through the evaporator is boiled into gas

by heat removed from the air. The warmed refrigerant gas enters the compressor where its temperature

and pressure are increased. The hot refrigerant gas condenses to liquid as heat is transferred to outdoor

air drawn across the condenser by the condenser fan. Liquid refrigerant is metered into the evaporator

through capillary tubes to repeat the cycle.

Heating Mode

A wall-mounted thermostat controls the heating cycle of models which incorporate resistance heating

elements. On a call for heat, the thermostat closes the heat relay to energize the indoor fan and the

resistance elements. Except on units with the optional dehumidication kit, the compressor is locked

out during the heating cycle.

Economizer Operation (ComPac

II A/C Only)

The economizer is a regulated damper system with controls. The damper regulates the circulation

of outside air into the enclosure (when the outdoor air conditions are suitable) to reduce the need for

mechanical cooling, save energy, and extend compressor life.

Depending upon the options selected, the damper responds to the enthalpy of the outdoor air. On a call

for cooling from a space thermostat, it operates as follows:

When the enthalpy of the outdoor air is below the set point, the outdoor air damper is proportion-

ally open (and return air damper is proportionally closed) to maintain between 50°F and 56°F at the

mixed/discharge air sensor. Integral pressure relief allows the indoor air to exit the shelter through the

air conditioner.

When the enthalpy of the outdoor air is above the set point, the outdoor air damper closes to its minimum

position. A call for cooling from the space thermostat brings on mechanical cooling.

An optional built-in adjustable minimum position potentiometer (part number 70012) controls the

amount of outdoor air admitted to meet minimum ventilation requirements.

Figure 2. Refrigerant Circuit

Evaporator (Indoor Coil)

Distributor &

Capillary

Tubes

Filter

Drier

Twin Blowers

Discharge Line

Condenser Fan

Condenser (Outdoor Coil)

Suction

Line

Compressor

ComPac 6/09-18

1.6 eleCTroniC ConTrol boarD MoDe of operaTion (aVp24-72)

Normal

24 VAC power must be continuously applied to “R” and “C”. Upon a call for cooling “Y” and with

the high pressure switch (HPS) closed, the compressor will be energized. (Note: See the delay on

make feature.) The compressor will remain energized during the 3 minute timed low pressure by-pass

cycle. If the low pressure switch (LPS) is open after the 3 minute by-pass cycle, the compressor will

de-energize.

Lock-out

If either of the fault conditions (LPS or HPS) occurs twice, the control board will enter into and indicate

the lockout mode. In the lockout mode, the compressor is turned off. If there is a call for indoor air

ow “G”, the blower remains energized, the alarm output is energized and the status led will blink

to indicate which fault has occurred. When the lockout condition is cleared, the unit will reset if the

demand for the thermostat is removed or when the power is reset. With the control board, the user can

now have either normally closed or normally open contacts by moving a wire on the control board.

The ComPac

air conditioners are factory wired to be normally open.

Delay on Break

If the compressor is de-energized due to a loss of a cooling “Y” call or the rst fault, the unit re-start

will be delayed 3 minutes from the time the contactor is de-energized. (Note: There is no delay on

break if the lockout condition is reset.)

Delay on Make

On initial power up only, the unit will wait 0.03 to 10 minutes from the cooling “Y” call before al-

lowing the contactor to energize. The delay can be adjusted by the DOM wheel on the board. Factory

recommended wait is 3 minutes.

Low Pressure By-Pass Time

When starting, the low pressure switch (LPS) fault condition will be by-passed for 3 minutes before

the contactor is de-energized.

Post Purge

Upon a call for indoor airow “G” the blower will energize immediately. When in the cooling mode,

the blower will remain energized for 10 to 90 seconds (adjustable) after the compressor has been

de-energized. The time period can be changed by fan purge wheel on the board. Factory setting is 90

seconds.

LED Indicator Lights

COLOR TYPE STATUS DESCRIPTION

Green Power Constant On 24 VAC power has been applied

Red Status Constant On Normal operation

Red Status 1 Blink High pressure switch has opened twice

Red Status 2 Blinks Low pressure switch has opened twice

ComPac 6/09-18

Low Ambient Control

The low ambient control permits cooling when outdoor ambient temperatures are low. The control

uses a reverse-acting high pressure switch to cycle the condenser fan motor according to liquid refrig-

erant pressure conditions. Switch closure and fan operation occurs when the pressure reaches 250

PSIG. The switch opens again when the refrigerant pressure falls to 190 PSIG. Therefore, the outdoor

fan always starts after the compressor, and it will cycle frequently during normal operation at low

outdoor conditions.

High Pressure Switch

The high pressure switch is mounted on the compressor discharge line. It is electrically connected to a

lockout relay which shuts down the system if the refrigerant pressure rises to 400 PSIG (AVP60 setting

is 450 PSIG). This protects the unit if airow through the condenser is blocked or if the outdoor fan

motor fails.

Although the contacts of the high pressure switch close when the refrigerant pressure falls to approxi-

mately 300 PSIG, the system must be manually reset once the lockout relay is activated. A manual

reset is necessary to prevent harmful short-cycling. To reset switch, turn primary power off, then back

on or turn thermostat system switch off, then back on.

Low Pressure Switch

The low pressure switch is mounted on the compressor suction line. It is designed to open if the re-

frigerant pressure drops to 35 PSIG; it resets when the pressure rises to 60 PSIG. The switch protects

the unit if airow through the indoor blower is impeded, if the blower motor fails, or if there is a loss

of refrigerant.

LEDs

POST PURGE

WHEEL

DELAY ON MAKE

(COMPRESSOR TIME DELAY)

WHEEL

ComPac 6/09-18

1.7 opTional ConTrols & paCkaGes

Hard Start Kit

Used on single phase equipment to give the compressor higher starting torque under low voltage condi-

tions. Generally not recommended on units with scroll compressors.

Extreme Duty Package

The Extreme Duty Package allows selected Marvair

ComPac

I & ComPac

II air conditioners to

operate in extremely cold and hot ambient conditions. The Extreme Duty Kit is always factory installed

and is available on all ComPac

air conditioners. ComPac

I air conditioners (non-economizer units)

will operate from 0° F to 130° F (-18° to 54°C). ComPac

II air conditioners (economizer units) will

operate from -20° F to 130° F (-29° to 54°C).

The Extreme Duty Package includes a suction line accumulator, thermal expansion valve (TXV),

crankcase heater, hard start kit, an auto reset, adjustable high pressure switch and an outdoor thermostat

and fan cycle switch. The fan cycle control is standard on all ComPac

air conditioners and operates

based upon the liquid line pressure. The outside thermostat closes whenever the outside temperature is

below 50°F (10°C) and opens when the outside temperature is 50° F (10°C) or higher. Whenever the

temperature is below 50°F (10°C), the fan cycle switch is in the circuit; when temperatures are 50° F

(10°C) or higher, the fan cycle switch is not in the circuit. The fan cycle control is used with a TXV to

prevent excessive cycling or "hunting" of the TXV.

Coastal Environmental (ComPac® I A/C Only)

Recommended for units to be installed near an ocean or on seacoast. Includes corrosion resistant

fasteners, sealed condenser fan motor, protective coating applied to all exposed internal copper in the

condenser section and a protective coating on the condenser coil.

Stainless Steel Cabinet (ComPac® I A/C Only)

All sheet metal constructed of stainless steel.

Hot Gas Bypass (ComPac® I A/C Only)

Used in specialty applications; i.e., Magnetic Resonance Imaging (MRI) buildings, to prevent magnetic

voltage disturbance caused by compressor cycling. Two hot gas bypass option packages are available

to allow operation to 20°F (-7°C) or minus 20°F (-29°C). Please refer to Hot Gas Bypass Application

Bulletin for details.

Electric Reheat Dehumidication

A humidity controller (p/n 50057) allows electric heat and cooling to operate simultaneously. Marvair

air conditioners equipped with the dehumidication option 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 building.

IMPORTANT: The electrical wire and breaker or fuses must be sized for simultaneous operation

of the electric heater and the air conditioner. Refer to the data sticker on the unit or the ComPac

Air Conditioner Product Data Sheet for the sizing information.

Dehumidication is achieved by operating mechanical cooling in conjunction with electric reheat. The

strip heat is sized approximately to the sensible capacity of the total tonnage of the machine (i.e., on a

24,000 BTU unit the strip heat is sized at approximately 20,000 BTU). Because the strip heat is sized

to the approximate sensible cooling capacity, only selected models are available.

Operation:

When the humidity rises above the set point on the humidity controller both mechanical cooling and

ComPac 6/09-18

electric reheat operate to temper the air and lower the humidity. If the temperature in the controlled

environment rises above the set point of the thermostat and the unit is operating in the dehumidication

mode, the call for cooling will override the call for dehumidication and the strip heat is disengaged

until the thermostat is satised. This assures the environment temperature is maintained as rst priority

and humidity control is second.

In applications where a shelter has redundant air conditioning units and is controlled by a lead lag

controller (Marvair's LL357D4 or CommStat3™ Controller), most times the dehumidication option

is only necessary on one of the two units. It is possible for one unit to be operating in the cooling mode

while the unit with dehumidication is operating at the same time. If the cooling unit does not maintain

the shelter temperature set point, the unit with dehumidication will go into the cooling mode. It does

not matter whether the unit with dehumidication is the lead or lag unit.

Three Phase Voltage Monitor, Marvair®

Continuously measures the voltage of each of the three phases. The monitor separately senses low

and high voltage, voltage unbalance including phase loss and phase reversal. An LED indicator glows

when all voltages are acceptable. Automatically resets when voltages and phases are within operating

tolerances.

Dirty Filter Indicators

A diaphragm type of indicator measures the air pressure on either side of the lter and when the pressure

drops below the set point, an LED is illuminated.

Minimum Potential Potentiometer

Used in the ComPac

II units with the factory installed economizer. The potentiometer prevents the

economizer from closing completely, assuring that outside air will be brought into the shelter and ex-

hausted whenever the indoor blower is operating. This prevents negative pressurization of the building.

The minimum potential potentiometer is adjustable.

1.8 eleCTriCal DiaGraMs

The compressor and condenser fan are energized with a contactor controlled by a 24 VAC pilot sig-

nal.

Some compressors incorporate an internal PTC crankcase heater that functions as long as primary power is

available. The heater drives liquid refrigerant from the crankcase and prevents loss of lubrication caused

by oil dilution. Power must be applied to the unit for 24 hours before starting the compressor.

The condenser (outside fan) motor is energized by the same contactor. However, the motor is cycled

on and off by the low ambient control (see low ambient control 1.6).

The indoor evaporator fan motor is controlled by the fan purge on the electronic control board.

ComPac 6/09-18

Figure 3a. Typical Electrical Schematic - ComPac

I A/C, Models AVP24-72

with Electronic Control Board

TRANSFORMER

ComPac 6/09-18

TRANSFORMER

OPTIONAL FIELD INSTALLED 270 OHMS MINIMUM POSITION POTENTIOMETER.

Figure 3b. Typical Electrical Schematic - ComPac

II A/C, Models AVP24-72

with Electronic Control Board

ComPac 6/09-18

1.9 eConoMizer CoMponenTs (CoMpaC

ii a/C only)

Damper Actuator:

The damper actuator is a 24V motor that modulates the position of the damper blade. It is capable

of driving a full 90 degrees within 90 seconds. The assembly has a spring return to close the damper

during power outage.

Controls:

The economizer is controlled by the H205A enthalpy control or optional dry bulb sensor.

H205A Economizer Changeover Control:

The H205A enthalpy controller responds to the total heat content of the outdoor air to provide changeover

to outside air for free cooling. The change point (factory set at "D") is adjustable from 53°F @ 50%

RH (full counterclockwise) to 78°F @ 50% RH (full clockwise). Refer to Figure 4 and Figure 5.

Once the H205A has selected outside air, the mixed air sensor will limit the air temperature delivered

to the space by modulating the damper blade to "mix in" a quantity of inside air to provide a constant

50° to 56°F. (Adjustable minimum potentiometer, part number 70012, is optional.)

Figure 4. H205A Temperature Control Points

CONTROL CONTROL POINT*

CURVE AT 50% RH

A 72°F/23°C

B 68°F/20°C

C 63°F/17°C

D 58°F/14.5°C

Full CCW is 55°F

*Approximate Deg.

ComPac 6/09-18

Mixed Air Sensor:

The mixed air sensor is a thermistor mounted on a bracket adjacent to the right side of the blower

assembly. The thermistor senses the air temperature entering the structure, and provides a signal to the

economizer controller for modulating the position of the damper. Nominal resistance of the sensor at

77° F is 3000 ohms.

Figure 5. H205A Control Point Adjustment

The controller modulates the position of the outside air damper in response to input from the enthalpy

and mixed air sensors. The controller is designed to maintain the supply air temperature between 50°

to 56°F by mixing warm indoor air with cooler outdoor air.

On a call for cooling from the wall-mounted thermostat, if outdoor conditions are suitable, the controller

will open the damper and admit outside air (i.e., economizer cooling). If the outdoor ambient is too

hot or humid, the controller will place the actuator in the closed or minimum open position and activate

mechanical cooling. The compressor is locked out during the economizer cooling mode.

54.4 Degrees

Between

Scaleplate

and Knob

Index Mark

on Controller

Flat on Shaft

Perpendicular

to Index Mark

on Controller

ComPac 6/09-18

2.1 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 "L"-shaped bottombracket is stored in the condenser air compart-

ment. Remove it 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 or to the oil system. 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 pump, return the unit to the

freight carrier.

2.2 insTallaTion requireMenTs

General

1. Inspect unit for completeness. Check for missing parts (e.g. hardware). Refer to the installation

kit information in section 2.3.

2. Remove access panels and check for loose wires. Tighten screw connections.

3. Complete and mail the warranty registration card.

You must consider all of the following when choosing the installation site:

1. Noise. Install the unit so that the least amount of noise will be transmitted to inhabited spaces.

2. Condensate Drainage. Condensate produced during operation must be discharged to a suitable

drain.

3. Placement.

A) Place the unit in a shaded area, if possible.

B) Install it above ground for protection against ooding.

C) The unit exhausts air. Be sure that the airow is not impeded by shrubbery or other obstruc-

tions.

D) When installing multiple units, please note the recommended clearances noted in Table 4.

4. Airow Requirements:

Note the minimum CFM requirements (Table 6). Keep duct lengths as short as possible. Do not

obstruct airow through the unit.

Chapter 2 Installation

WARNING

Failure to observe and follow Warnings and Cautions and these Instructions could result in

death, bodily injury or property damage. Read this manual and follow its instructions and

adhere to all Cautions and Warnings in the manual and on the Marvair unit..

ComPac 6/09-18

Installation Kits

The ComPac

I and ComPac

II A/C units, models AVP24-72, are shipped with one 12 Ga. "L" shaped

bottom bracket. On AVP24,30 & 36 units, there is an air intake hood packed inside each unit. If you

have not yet unpacked the unit, follow the instructions in section 2.1. All units have built-in full length

mounting anges. Therefore, use of mounting brackets is not required.

Kit Components - Models AVP24-72:

1. One 12 Ga. "L"-shaped bottom bracket

Accessories:

The package may include other factory-supplied items (optional) as follows on the next page:

6. Codes:

Make sure your installation conforms to all applicable electrical, plumbing, building, and municipal

codes. Some codes may limit installation to single story structures.

7. Electrical Supply:

The power supply must have the appropriate voltage, phase, and ampacity for the model selected.

Voltage must be maintained above minimum specied values listed below. Refer to the data sticker

on the unit for ampacity requirements.

Table 4. Minimum Clearances

Table 5. Voltage Limitations

2.3 Installation Materials (AVP24-72)

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 of

the heater element. This includes proper supply duct sizing, sufcient quantity of supply registers,

and adequate return and lter areas. Duct work must be of correct material and must be properly

insulated. Duct work must be constructed of galvanized steel with a minimum thickness of .019

inches. Duct work must be rmly attached, secured, and sealed to prevent air leakage. See section

2.4 for additional duct work requirements.

Clearances:

Note the minimum clearances required for proper operation and service.

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 5.

MODEL

MIN. CLEARANCE AROUND

SIDES (SINGLE UNIT)

MIN. CLEARANCE BETWEEN

UNITS (TWO UNITS)

MIN. SPACE

ABOVE UNIT

24 30 inches 18 inches 24 inches

30/36 30 inches 18 inches 24 inches

42/48/60 30 inches 30 inches 24 inches

72 30 inches 30 inches 12 inches

ComPac 6/09-18

P/N Description

S/04581 CommStat 3™ Controller, Solid State Lead/Lag Controller

S/07529 LL357D4, Lead/Lag Controller with T'stat & Sub-Base; Controls 2 A/C Units

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.

50107

Digital thermostat. 2 stage heat, 2 stage cool. 7 day programmable. Fan switch: Auto &

On. Auto-change over. Status LED’s. Backlit display. Programmable fan. Non-volatile

program memory.

80674 VPG - 20S, 20 x 8" Adjustable, Aluminum, Double Deection Supply Grill for

AVP24

80675 VPG - 30S, 28 x 8" Adjustable, Aluminum, Double Deection Supply Grill for

AVP30-36

80676 VPG - 40S, 30 x 10" Adjustable, Aluminum, Double Deection Supply Grill for

AVP42-48-60-72

80677 VPG - 20R, 20 x 12" Aluminum Return Grill for AVP24

80678 VPG - 30R, 28 x 14" Aluminum Return Grill for AVP30-36

80679 VPG - 40R, 30 x 16" Aluminum Return Grill for AVP42-48-60-72

06777 Start Relay and Capacitor for AVP24-36 (Field Installed) (Not recommended for scroll

compressors.)

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. Concrete or berglass structures have different requirements.

ComPac

I and ComPac

II A/C Models 24-72

(10) 3/8" carriage head mounting bolts for unit mounting anges. The length needed is typically

the wall thickness plus one inch.

(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

• 4-conductor low voltage multicolored 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.

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Marvair ComPac II AVP48 User manual

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