Airxcel Marvair ComPac II Series Product Manual
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Airxcel Marvair ComPac II Series Product Manual

Vertical wall-mount air conditioners with front control box panel
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®
®
ComPac
I and ComPac
II
Air Conditioner Product Manual
Vertical Wall-Mount Air Conditioners
with Front Control Box Panel
Models AVP20-24-30-36-42-48-60-72
Description ......................................... 5
Installation ........................................ 22
Start-Up ............................................. 39
Troubleshooting .............................. 41
Parts List .......................................... 44
Maintenance .................................... 47
Warranty ........................................... 48
R
N
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: marvairtech@airxcel.com • Internet: www.marvair.com
P/81024
9/04-12
supersedes 11/03-11

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  • Page 1: Table Of Contents

    Warranty ........... 48 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: marvairtech@airxcel.com • Internet: www.marvair.com P/81024 9/04-12 supersedes 11/03-11...
  • Page 2 * Beware of sharp edges on sheet metal components * Use care when recovering or adding refrigerant 6. Use COMMON SENSE - BE SAFETY-CONSCIOUS SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. ® ® © 9/04 Marvair Div. Airxcel , Inc. ComPac 9/04-12...
  • Page 3 ® ComPac A/C Description & Specifications ABLE OF General Description ..................5 ONTENTS Model Identification ..................5 Serial Number Date Code ................5 Ratings and Specifications ................6 General Operation ..................9 1.6a Electronic Control Board Mode of Operation ..........10 1.6b Mechnical Controls ..................
  • Page 4 ® Figure 1a. ComPac I & II A/C Dimensions - Models 20-36 ....... 7 LLUSTRATIONS ® ComPac I & II A/C Dimensions - Models 42-60 ......7 ® ComPac I & II A/C Dimensions - Model 72 ....... 8 Figure 2. Refrigerant Circuit .................

  • Page 5: Description

    & ESCRIPTION PECIFICATIONS 1.1 G ® Marvair's ComPac lines are a series of vertical wall-mounted air conditioning systems that ENERAL provide heating, cooling, and ventilation for electronic equipment shelters, process control ESCRIPTION centers, and other applications with high internal heat gains. The series includes multiple sizes and nominal cooling capacities from 18,000 to 72,000 BTUH.

  • Page 6: Ratings And Specifications

    1.4 R & ATINGS MODEL 0.10 0.20 0.25 0.30 0.40 0.50 PECIFICATIONS 1100 1000 1310 1220 1185 1150 1060 1650 1585 1520 1450 1360 1900 1830 1760 1700 1620 1900 1830 1760 1700 1620 2100 1950 1800 1730 1660 Table 1. CFM @ External Static Pressure (Wet Coil) (IWG) 20/24 30/36 MODEL...

  • Page 7: Figure 1A

    MOUNTING HOLES CTR TO CTR 2.0"/51 mm SUPPLY AIR OPENING HEATER ACCESS 67.0" 2.0"/ 1702 mm 51 mm SLOTS IN 2.0"/ CII ONLY 51 mm 50-3/4" DISCONNECT K.O.'s** ACCESS 1289 mm RETURN AIR OPENING OUTSIDE AIR HOOD 34-1/2" 876 mm 2.0"/ 51 mm K.O.'s**...
  • Page 8 SLOTS IN COMPAC® II ONLY SLOTS IN COMPAC® II ONLY ® ® Figure 1c. ComPac I A/C & ComPac II A/C Dimensions- Models AVP72 (in inches & mm) ComPac 9/04-12...

  • Page 9: General Operation

    1.5 G Refrigerant Cycle (Cooling Mode) ENERAL ® ® The ComPac I & ComPac II A/C use R-22 refrigerant in a conventional vapor- PERATION compression refrigeration 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.

  • Page 10: Electronic Control Board Mode Of Operation

    Normal LECTRONIC 24 VAC power must be continuously applied to “R” and “C”. Upon a call for cooling “Y” and ONTROL OARD with the high pressure switch (HPS) closed, the compressor will be energized. (Note: See the ODE OF delay on make feature.) The compressor will remain energized during the 3 minute timed low PERATION pressure by-pass cycle, if the low pressure switch (LPS) is open the compressor will de- (AVP20-60)
  • Page 11 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 refrigerant pressure conditions. Switch closure and fan operation occurs when the pressure reaches 250 PSIG.

  • Page 12: Mechnical Controls

    Time Delay/Anti-Short Cycle Timer ECHANICAL The time delay (delay on make) prevents the compressor from restarting immediately after ONTROLS interruption of power. The delay interval, which is adjustable from .2 to 10 minutes (factory (AVP20-72) set at 3 minutes), protects the compressor by allowing internal refrigerant pressures to equalize.
  • Page 13 ® ® 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).

  • Page 14: Electrical Diagrams

    the dehumidification mode, the call for cooling will override the call for dehumidification and the strip heat is disengaged until the thermostat is satisfied. This assures the environment temperature is maintained as first 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 LL357D2 or CommStat3™...

  • Page 15: Figure 3A. Typical Electrical Schematic-Compac

    NOTE 1 NOTE 2 NOTE 4 NOTE 3 TRANSFORMER GENERAL NOTES: 1. 208/230 VOLT 60 HZ, 1 PH POWER SUPPLY. SEE DATA PLATE FOR AMPACITY & FUSE SIZE. DISCONNECT SHOWN. 2. SPEED TAP FOR MULTISPEED MOTORS - SEE MOTOR NAMEPLATE FOR WIRE COLOR. 3.

  • Page 16: With Electronic Control Board

    TRANSFORMER Figure 3b. Typical Electrical Schematic - ComPac ® I A/C, Models AVP20-60 with Electronic Control Board ComPac 9/04-12...
  • Page 17 NOTE 1 NOTE 2 NOTE 5 TRANSFORMER NOTE 3 NOTE 4 GENERAL NOTES: 1. 208/230 VOLT 60 HZ, 1 PH POWER SUPPLY. SEE DATA PLATE FOR AMPACITY & FUSE SIZE. DISCONNECT SHOWN. 2. SPEED TAP FOR MULTISPEED MOTORS - SEE MOTOR NAMEPLATE FOR WIRE COLOR. 3.

  • Page 18: With Electronic Control Board

    TRANSFORMER ® Figure 3d. Typical Electrical Schematic - ComPac II A/C, Models AVP20-60 with Electronic Control Board ComPac 9/04-12...
  • Page 19 TRANSFORMER GENERAL NOTES: 1. 208/230 VOLT 60 HZ, 1 PH POWER SUPPLY. SEE DATA PLATE FOR AMPACITY & FUSE SIZE. DISCONNECT SHOWN. 2. SPEED TAP FOR MULTISPEED MOTORS - SEE MOTOR NAMEPLATE FOR WIRE COLOR. 3. TRANSFORMER IS FACTORY WIRED FOR 230 VOLT OPERATION. FOR LOWER VOLTAGES, INTERCHANGE ORANGE AND RED LEADS.
  • Page 20 TRANSFORMER GENERAL NOTES: 1. 208/230 VOLT 60 HZ, 1 PH POWER SUPPLY. SEE DATA PLATE FOR AMPACITY & FUSE SIZE. DISCONNECT SHOWN. 2. SPEED TAP FOR MULTISPEED MOTORS - SEE MOTOR NAMEPLATE FOR WIRE COLOR. 3. TRANSFORMER IS FACTORY WIRED FOR 230 VOLT OPERATION. FOR LOWER VOLTAGES, INTERCHANGE ORANGE AND RED LEADS.

  • Page 21: Economizer Components

    Damper Actuator: 1.9 E CONOMIZER The damper actuator is a 24V motor that modulates the position of the damper blade. It is OMPONENTS capable of driving a full 90 degrees within 90 seconds. The assembly has a spring return to ®...

  • Page 22: Figure 5. H205A Control Point Adjustment

    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.) The controller modulates the position of the outside air damper in response to input from the enthalpy and mixed air sensors.

  • Page 23: Installation

    NSTALLATION Concealed Damage 2.1 E QUIPMENT Inspect all cartons and packages upon receipt for damage in transit. Remove cartons and NSPECTION check for concealed damage. Important: keep the unit upright at all times. Remove access panels and examine component parts. (Note: the bracket is stored in the condenser air compartment.

  • Page 24: Installation Materials

    must be constructed of galvanized steel with a minimum thickness of .019 inches. Duct work must be firmly 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. MIN.
  • Page 25 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.

  • Page 26: Porting And Duct Work

    2.4 P General Information ORTING AND Note: The following instructions are for general guidance only. Due to the wide variety of installation possibilities, specific instructions will not be given. When in doubt, follow standard (AVP20-72) ® and accepted installation practices, or contact Marvair for additional assistance.

  • Page 27: Fresh Air Hood Installation

    1. Cut and remove insulation on the inside of the lower front access panel in the shape of the 2.5 F RESH rectangular opening. See Figure 6. NSTALLATION 2. Insert flange on hood into opening and secure using the two #8 x 1/2 sheet metal screws (AVP20-72) supplied.

  • Page 28: Electrical Connections

    GRILLE SUPPLY AIR DUCT EXTENSIONS (Not Supplied with Unit) COMP AC II™ A/C ONLY RETURN AIR GRILLE FOAM SEAL ® ® Figure 7. ComPac I and ComPac II A/C Wall Mount Detail (AVP20-72) Important LECTRICAL All electrical work must meet the requirements of local codes and ordinances. Work ONNECTIONS should be done only by qualified persons.
  • Page 29 Dual Unit Phasing For applications where one controller operates two units, e.g., the CommStat 3 or LL357D. The current model, LL357D2, does not require unit phasing. However, if other devices are connected to the control system, phasing of the air conditioner is required. Earlier models; i.e., LL357, LL357A, require the unit to be properly phased.
  • Page 30 • Automatic system switch, No fan signal. • Automatic switch-over between heating and cooling. • Digital display in °F or °C. • Setpoints are permanently held in memory - no batteries required. Timing Device • Solid state timer with both 3.5 and 7 day changeover capability. NOTE: Cut timer circuit wire to provide 3.5 day changeover.

  • Page 31: Figure 8A. Thermostat Wiring Details

    4 WIRE WALL THERMOSTAT Four (4) Conductor Color- Coded 18 Gauge Thermostat Cable (Field Supplied) NOTE: 4 WIRE WALL THERMOSTAT Terminals 5 & 7 are normally open dry contacts and close to indicate lockout. Four (4) Conductor Color- Coded 18 Gauge Thermostat Cable (Field Supplied) NOTE: Terminals 5 &...

  • Page 32: Figure 8C

    Figure 8c. CommStat 3™ Wiring Diagram ComPac 9/04-12...

  • Page 33: Start-Up

    Important: Be sure that the crankcase heater (if used) has been energized for at least TART 24 hours before starting the unit(s). Double-check all electrical connections before applying power. 3.1 C Procedure: HECK UT OF 1. Set the cooling temperature on the wall thermostat to a point higher than the ambient OOLING YCLE temperature.

  • Page 34: A/C Testing With Ll357D2

    Note: The LL357D2 does not require the units to be in phase. 3.3 A/C T ESTING LL357D2 WITH Procedure: (A/C Testing with LL357D2 Lead/Lag Control for Two Units) 1. Set the cooling temperature on the wall thermostat to a point higher than the ambient temperature.

  • Page 35: Troubleshooting

    ® ROUBLESHOOTING A comprehensive understanding of the operation of the ComPac A/C is a prerequisite to troubleshooting. Please read the Chapter 1 for basic information about the unit. 4.1 O ® Marvair's ComPac air conditioners are thoroughly tested before they are shipped from the VERVIEW factory.

  • Page 36: Failure Symptoms Guide

    4.2 F AILURE PROBLEM / SYMPTOM LIKELY CAUSE(S) CORRECTION YMPTOMS UIDE 1. Check power supply for adequate A. Unit does not run. 1. Power supply problem. phase and voltage. Check wiring to unit and external breakers or 2. Tripped internal disconnect. fuses.

  • Page 37: Compressor Troubleshooting

    PROBLEM / SYMPTOM LIKELY CAUSE(S) CORRECTION 1. Obstruction in condensate line. E. Water on floor near unit. 1. Check for clog or restriction. 2. Obstruction or leak in conden- 2. Check pan for leak or blockage. sate pan. 3. Unit is not level. 3.

  • Page 38: Control Board Diagnosis

    4.4 C The control board (see section 1.6a for a complete description of the control board) has ONTROL a red diagnostic LED which indicates the lockout fault. The control board will enter into and OARD indicate lockout if either of the fault conditions (LPS or HPS) occur twice. IAGNOSIS The contactor must be closed before the first fault condition can be recognized by the control board.

  • Page 39: Parts List

    ® ComPac I and II (AVPxxAC) ARTS Item Description Compressor (Comp) 5.1 P ACA (1 Ph, 230 V) 10046 10205 10208 10233 10052 10202 10108 P/10005 ARTS ACA (1 Ph, 230 V, Optional Scroll) 10104 10109 10079 ACC (3 Ph, 230 V) 10206 10209 10226...

  • Page 40: Illustrations

    5.2 I LLUSTRATIONS AVP20-36 Control Box with Mechanical Relays & Contactors AVP20-24 Control Box with Electronic Control Board AVP30-36 Control Box with Electronic Control Board ® ComPac I A/C Models 20-36 AVP42-72 Control Box with Mechanical Relays & Contactors AVP42-60 Control Box with Electronic Control Board ®...
  • Page 41 AVP20-36 Control Box with Mechanical Relays & Contactors AVP20-24 Control Box with Electronic Control Board AVP30-36 Control Box with Electronic Control Board ® ComPac II A/C Models 20-36 AVP42-72 Control Box with Mechanical Relays & Contactors AVP42-60 Control Box with Electronic Control Board ®...

  • Page 42: Maintenance

    AINTENANCE 6.1 S ® Marvair strongly recommends that the air conditioner be serviced a minimum of twice CHEDULED a year – once prior to the heating season and once prior to the cooling season. At this AINTENANCE time the filters, evaporator coil, condenser coil, the cabinet, and condensate drains should be serviced as described below.

  • Page 43: Warranty

    ARRANTY 7.1 L IMITED ® If any part of your Marvair Air Conditioner, Heat Pump or Unit Ventilator fails because of a manufacturing defect within fifteen months from the date of original shipment from RODUCT Marvair or within twelve months from the date of original start-up, whichever is the earlier ARRANTY date, Marvair will furnish without charge, EXW Cordele, Georgia, the required replacement part.

  • Page 44: Optional Silver Service Program

    ® 7.2 O If any part of your Marvair Heat Pump or Air Conditioner fails because of a manufacturing defect within PTIONAL fifteen months from the date of original shipment by Marvair or within twelve months from the date of original start-up, whichever is the earlier date, Marvair will furnish without charge, EXW Cordele, Georgia, the required replacement part and pay for the related service labor to replace the failed part.

This manual is also suitable for:

Marvair compac i seriesMarvair compac i avp24Marvair compac i avp30Marvair compac i avp36Marvair compac i avp20Marvair compac i avp42 ... Show all

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