Marvair ComPac II AVP48 User manual

Category
Heat pumps
Type
User manual
Chapter 1 Description ...................................... 5
Chapter 2 Installation .................................... 18
Chapter 3 Start-Up ........................................
30
Chapter 4 Troubleshooting ............................ 32
Chapter 5 Maintenance .................................. 35
Chapter 6 Warranty ....................................... 36
Parts List & Exploded Views .............................. 38
ComPac
®
I and ComPac
®
II
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
2
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
6.
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.
© 6/09 Marvair
®
Div. Airxcel
®
, Inc.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.
!
DANGER
!
WARNING
!
CAUTION
3
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.
4
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 ...........................................................................................................
37
Parts List and Exploded Views .....................................................................................................................38
5
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.
Marvairs 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
conditioners 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
6
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.
7
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)
8
ComPac 6/09-18
Figure 1c. ComPac
®
I A/C & ComPac
®
II A/C Dimensions- Models AVP72 (in inches & mm)
9
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
10
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
11
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
12
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
13
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.
14
ComPac 6/09-18
Figure 3a. Typical Electrical Schematic - ComPac
®
I A/C, Models AVP24-72
with Electronic Control Board
5
6
TRANSFORMER
15
ComPac 6/09-18
5
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
16
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.
17
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.
D
C
B
A
54.4 Degrees
Between
Scaleplate
and Knob
Index Mark
on Controller
Flat on Shaft
Perpendicular
to Index Mark
on Controller
18
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..
19
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.
5.
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
20
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

Category
Heat pumps
Type
User manual

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