Marvair AVP 24 Manual

Chapter 1 Description ... 5Chapter 2 Installation ... 18Chapter 3 Start-Up ...

10ComPac 5.20111.5 General OperationRefrigerant Cycle (Cooling Mode)The ComPac® I & ComPac® II A/C use R-407c refrigerant in a conventional vap

11ComPac 5.2011Delay on BreakIf the compressor is de-energized due to a loss of a cooling “Y” call or the rst fault, the unit re-start will be dela

12ComPac 5.2011Low Pressure SwitchThe low pressure switch is mounted on the compressor suction line. It is designed to open if the re-frigerant pres

13ComPac 5.2011until the thermostat is satised. This assures the environment temperature is maintained as rst priority and humidity control is sec

14ComPac 5.20111.8 Electrical OperationThe compressor and condenser fan are energized with a contactor controlled by a 24 VAC pilot s

15ComPac 5.2011Figure 2a. Typical Electrical Schematic - ComPac® I A/C

16ComPac 5.2011Figure 2b. Typical Electrical Schematic - ComPac® II A/C

17ComPac 5.20111.9 Economizer Components (ComPac® II A/C Only)Damper Actuator:The damper actuator is a 24V motor that modulates the position of the

18ComPac 5.2011Chapter 2 Installation WARNINGFailure to observe and follow Warnings and Cautions and these Instructions could result in death, bodi

19ComPac 5.2011standards. Marvair® strongly recommends referring to the current edition of the National Fire Pro-tection Association Standards 90A a

2ComPac 5.2011How To Use This Manual This manual is intended to be a guide to Marvair's ComPac® line of vertical air conditioners. It contains

20ComPac 5.2011P/N DescriptionS/04581 CommStat 3 Controller, Solid State Lead/Lag ControllerS/07846 CommStat 4

21ComPac 5.2011 WARNINGFIRE HAZARDImproper adjustment, alteration, service, maintenance or installation could cause serious injury, death and/or pro

22ComPac 5.2011BASIC MODEL MAXIMUM TOTAL STATIC MINIMUM FILTER AREAAVP24 .30 2.75AVP30/36 .40 3.33AVP42/48/60 .50 5.50AVP72 .50 6.00Table 6. Ma

23ComPac 5.20112.7 Mounting The Unit1. For wiring into the back of unit, locate the lower of the two knockouts on the wall side of the unit. Dril

24ComPac 5.20112.8 Electrical Connections WARNING ELECTRICAL SHOCK HAZARDFailure to follow safety warnings exactly could result in serious injury,

25ComPac 5.2011Dual Unit PhasingFor applications where one controller operates two units, e.g., the CommStat 4 or LL357D.The LL357D4 and the LL357D3

26ComPac 5.2011environmental control units. See CommStat 3 Product Data Sheet for installation and programming instructions.LL357D4 Lead/Lag Control

27ComPac 5.2011Figure 6a. Humidistat (P/N 50254) Wiring to a ComPac Air Conditioner with Reheat.Figure 6b. Thermostat Connection Diagram

28ComPac 5.2011Figure 6c. LL357D4 Wiring Diagram & Thermostat Keys

29ComPac 5.2011LORGWCYRCommStat 3Low Building Temp AlarmSmoke Alarm+24v.+48v24/48 comDC BACKUPPOWER CONNECTIONSAir Conditioner #1 Terminal BoardAir

3ComPac 5.2011 WARNING• If the information in these instructions are not followed exactly, a re may result causing property damage, personal injury

30ComPac 5.2011Chapter 3 Start-Up3.1 Check-Out of Cooling CycleImportant: Be sure that the crankcase heater (if used) has been energized for at l

31ComPac 5.2011Chapter 4 Troubleshooting4.1 OverviewA comprehensive understanding of the operation of the ComPac® A/C is a prerequisite to trouble

32ComPac 5.2011PROBLEM/SYMPTOM LIKELY CAUSE(S) CORRECTIONC. Unit cycles on high/low pressure limit.1. Loss or restriction of airflow.2. Res

33ComPac 5.20113. Motor Winding Resistances: Using a digital volt-ohm meter (VOM), measure the resistance across the compressor windings as

34ComPac 5.2011Chapter 5 Maintenance5.1 Scheduled MaintenanceMarvair® strongly recommends that the air conditioner be serviced a minimum of twice

35ComPac 5.2011Chapter 6 Warranty6.1 Limited Product WarrantyIf any part of your Marvair® Air Conditioner, Heat Pump or Unit Ventilator fails beca

36ComPac 5.2011EXPLODED VIEWS AND PARTS LISTS Current parts lists and exploded views of the unit can be found on our web site at www.marvair.com.

4ComPac 5.2011Table of ContentsChapter 5 Maintenance5.1 Scheduled Maintenance ...

5ComPac 5.2011Chapter 1 Description & Specications1.1 General DescriptionThe Marvair® ComPac® I and ComPac® II air conditioners are designed t

6ComPac 5.20111.2 Model IdenticationThe model identication number is found on the data sticker. Rating plate located on side panel. ••• C • AC

7ComPac 5.2011DIMENSIONS - AVP 24-36MODELADEFGHMAVP24IN39-3/8820-1/212 27-3/4 20 37-7/8MM1000 203 521 305 705 508 962AVP30-36IN44-9/16 81814 28-1/2 2

8ComPac 5.201151 mm19 mm x 25 mm3/4” (19 mm)152 mm610 mm1067 mm1524 mm1981 mm1-1/2”38 mm10 mm502 mm502 mm1054 mm10 mm38 mm57 mm117 mm19 mm x 25 mmMOD

9ComPac 5.2011Figure 1c. Dimensional Data - Model AVP72 ComPac® I & ComPac® II Air Conditioners