Marvair AVHA 12 series, Installation & Operation Manual

Page 1: ... current version of this manual can be found at www Marvair com IMPORTANT This manual may include information for options and features which may not be included on the unit being installed Refer to the unit data label or Model Identification to determine which features and options this unit is equipped with INSTALLER Affix the instructions on the inside of the building adjacent to the thermostat E...

Page 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 OBSERVEandCOMPLYwithALLapplicablePLUMBING ELECTRICAL andBUILDINGCODESandordinances 5 SERVICE may be performed ONLY by QUALIF...

Page 3: ...rmostat END USER Retain these instructions for future reference Table of Contents Chapter 1 ComPac Description Specifications 1 1 General Description 5 1 2 Model Identification 5 1 3 Serial Number Date Code 5 1 4 Air Flow Weights and Filter Sizes 6 1 5 General Operation 6 1 6 Electronic Control Board Mode of Operation 7 1 7 Optional Controls and Packages 9 1 8 Electrical Operation 11 1 9 Economize...

Page 4: ...hematic Model HVESA Alternate Construction 17 Figure 2 Dry Bulb sensor 19 Figure 3 Enthalpy Sensor Temperature Control Points 20 Figure 4 Electrical Controls HVESAAlternate Construction 20 Figure 5 Economizer Control Board 21 Figure 6 Back Panel Configuration for AVPA AVHA12 Air Conditioners 26 Figure 7a Fresh Air Hood Damper Models 24 72 28 Figure 7b Fresh Air Hood Damper Models AVPA AVHA12 28 Fi...

Page 5: ...ce technician A complete description of functions of the control board is in Section 1 6 ComPac and models are designed for easy installation and service Major components are accessible for service beneath external panels All units have internal disconnects optional on 380V and 575V Depending upon state and local code requirements this feature may eliminate the need for an external breaker or disc...

Page 6: ... flow Table 1 CFM External Static Pressure Wet Coil IWG MODEL INCHES MILLIMETERS PART NUMBER FILTERS PER UNIT MERV RATING AVPA AVHA12 Non Economizer 20 x 10 x 2 508 x 254 x 52 91974 1 7 AVPA AVHA12 With Economizer 22 x 6 x 2 565 x 159 x 51 80172 1 7 AVPA24 AVHA20 24 25 x 16 x 2 635 x 406 x 52 80137 1 7 AVPA AVHA30 36 HVEA24 30 x 16 x 2 762 x 406 x 52 80138 1 7 AVPA AVHA42 48 60 HVEA30 36 42 HVESA3...

Page 7: ... outdoor air damper closes to its minimum position A call for cooling from the space thermostat brings on mechanical cooling A built in adjustable minimum position potentiometer controls the amount of outdoor air admitted to meet minimum ventilation requirements 1 6 Electronic Control Board Mode of Operation Normal 24 VAC power must be continuously applied to R and C Upon a call for cooling Y and ...

Page 8: ...liquid refrigerant pressure conditions Switch closure and fan operation occurs when the pressure reaches 400 PSIG The switchopensagainwhentherefrigerantpressurefallsto290PSIG Therefore theoutdoorfanalwaysstarts 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 liquid line It is electri...

Page 9: ...mperature 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 Protective Coating Packages Typically only the non economizer ComPac are used in corrosive environments but the ComPac with an economizer is also available...

Page 10: ...ntrolled environment rises above the set point of the thermostat and the unit is operating in 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 Inapplicationswhereashelterhasredundantairco...

Page 11: ...ts to operate in very hot ambients 131 F 55 C Includes a thermal expansion valve a sealed condenser fan motor slotted base pan and a sealed control box A closed loop design on the ComPac I units insures that no outside air is introduced into the shelter Cabinet Color and Material Marvair ComPac air conditioners are available in three different cabinet colors the standard Marvair beige white and gr...

Page 12: ...12 Marvair ComPac Installation Operation Manual 12 2017 Rev 16 Figure 1a Typical Electrical Schematic ComPac Non Economizer Model AVPA AVHA ...

Page 13: ...Marvair ComPac Installation Operation Manual 12 2017 Rev 16 13 Figure 1b Typical Electrical Schematic ComPac Economizer Model AVPA AVHA ...

Page 14: ...14 Marvair ComPac Installation Operation Manual 12 2017 Rev 16 Figure 1c Typical Electrical Schematic ComPac Non Economizer Model HVEA ...

Page 15: ...Marvair ComPac Installation Operation Manual 12 2017 Rev 16 15 Figure 1d Typical Electrical Schematic ComPac Economizer Model HVEA ...

Page 16: ...16 Marvair ComPac Installation Operation Manual 12 2017 Rev 16 Figure 1e Typical Electrical Schematic ComPac Economizer Model HVESA Alternate Construction ...

Page 17: ...Marvair ComPac Installation Operation Manual 12 2017 Rev 16 17 Figure 1f Typical Electrical Schematic ComPac Economizer Model HVESA Alternate Construction ...

Page 18: ...mper Economizer changeover control setting Enthalpy Sensor The enthalpy sensor responds to the total heat content of the outdoor air to provide the changeover to outside air for free cooling The control board must be configured for proper operation of the economizer by selecting the desired changeover temperature The desired temperature is selected by four dip switches on the board See item 9 in F...

Page 19: ...ooler outdoor air to provide a constant 50 F to 56 F 10 C to 13 5 C 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 Minimum Position Potentiometer W2 jumper The pote...

Page 20: ...ing Setting the potentiometer to MAX means that the damper stays in the full OPEN position at all times Factory setting is 50 Brand of Sensor Selection W3 jumper Honeywellenthalpyanddrybulbsensorsarecurrentlytheonlybrandofsensorsusedintheairconditioners Jumper W3 allows us to use alternative brands at a future date On all current air conditioners pins 1 2 are jumpered on W3 See item 4 in Figure 4 ...

Page 21: ...n Potentiometer 0 to 100 Factory setting is 50 2 Field connection from CommStat 4 2 terminal 5 For Honeywell sensors 8 W2 Minimum Position Potentiometer Jumper Jumper Pins 1 2 to Disable Factory setting Jumper pins 2 3 to Enable 3 Field connection from CommStat 4 MAR terminal 6 For Prism sensors 9 Enthalpy Dip Switches Set points are same as previous Honeywell controller Factory setting is 4 63 F ...

Page 22: ...s 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 ...

Page 23: ... operation and service MODEL MIN CLEARANCE AROUND SIDES SINGLE UNIT MIN CLEARANCE BETWEEN UNITS TWO UNITS MIN SPACE ABOVE UNIT MIN SPACE BELOW UNIT A B C D 12 24 inches 76 cm 18 inches 46 cm 24 inches 61 cm 6 inches 15 cm 20 24 30 inches 76 cm 18 inches 46 cm 24 inches 61 cm 6 inches 15 cm 30 36 30 inches 76 cm 18 inches 46 cm 24 inches 61 cm 6 inches 15 cm 42 48 60 30 inches 76 cm 30 inches 76 cm...

Page 24: ... 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 92379 17 x 17 Combination Aluminum Supply and Return Grille for the AVPA12 ComPac II units with economizer Requires S 09392 17 x 17 wall sleeve 80681 26 x 17 Combination Alumin...

Page 25: ...ns could result in hazards to you and others Installation MUST conform with local codes or in the absence of local codes with codes of all governmental authorities have jurisdiction The information contained in this manual is intended for use by a qualified service agency that is experienced in such work is familiar with all precautions and safety procedures required in such work and is equipped w...

Page 26: ...e enclosure 1 When facing the supply and return air opening locate the side duct flanges on either side of the opening Each flange is held in position with four screws two on the side one at the top and one at the bottom 2 Remove the screws and slide the duct flange out so that the holes in the duct flange aligns with the holes for the larger opening 3 Replace the eight screws four on each duct fl...

Page 27: ...s without duct work Applications using 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 sufficient air flow through the unit to pre...

Page 28: ...te the center of the wall stud Drill a pilot hole in the stud to prevent it from splitting 2 7 Mounting The Unit 1 For wiring into the back of unit locate the lower of the two knockouts on the wall side of the unit Drill a one inch hole in the shelter wall to match this opening Allow sufficient clearance to run 3 4 conduit through the hole and to the unit 2 Using an appropriate and safe lifting de...

Page 29: ... TO AIR FLOW WITHIN 24 610 MM OF BOTH SIDES AND IN FRONT OF THE UNIT CONDENSER AIR IN BOTH SIDES CONDENSER AIR IN BOTH SIDES CONDENSER AIR OUT All units with electric heat MUST have one inch 25 4 mm clearance on all four sides of the duct flange on the unit and on all four sides of the wall sleeve The 1 25 4 mm clearance MUST extend on all sides of the wall sleeve and on any extension added to the...

Page 30: ...hrough supply grille Once the shelter is pressurized the gravity dampers on the sides of the unit open to allow the warm room exhaust to exit the shelter No re ingestion of the air is allowed because the cold air is drawn in through the bottom of the unit and warm air exhausted above it in the middle part of the unit Economizer Closed The sectors at 3 O clock and 9 O clock position are closed duri...

Page 31: ...d system with small critical refrigerant charges where the installation of gauges may be objectionable can be made by monitoring the temperature of the refrigerant lines at the compressor The temperature should rise on the discharge line while the suction line temperature decreases Reverse rotation also results in a substantially reduced current draw when compared to tabulated values There is no n...

Page 32: ...ld power leads connected to the internal circuit breaker on one of the units only D Restore power and retest the phase step B When the voltage reads 0 the units are in phase E Turn off power and proceed Low Voltage Wiring IMPORTANT The following instructions are generic wiring instructions and may not be applicable for air conditioners with various options Always refer to the wiring diagram in the...

Page 33: ...roller is a solid state control package designed to operate a fully or partially redundant air conditioning system for a telecommunication cabinet or shelter The CommStat 3 Controller is factory programmed with standard industry set points to facilitate installation If desired each of the set points can be quickly and easily changed in the field by the installer It can be used with the ComPac s un...

Page 34: ...Contacts NC C NO Dry Contacts NC C NO High Building Temp Alarm Dry Contacts NC C NO 5 Connect to Normally Closed NC dry contacts from smoke alarm SMOKE ALARM JUMPER NOTE IF LINE VOLTAGE IS BELOW 220 VAC USE THE 208 TRANSFORMER TAP 1 24 VAC connections only 2 For immediate shutdown of air conditioner upon a signal from the smoke alarm the jumper between terminals 8 and 10 in the ComPac I and ComPac...

Page 35: ...es NOTE Economizer Equipped models only To check the system operation under different ambient conditions the air temperature and enthalpy sensors must be tricked When outdoor ambient condi tions are higher than the control setting a component cooler aerosol may be sprayed directly into the enthalpy sensor to simulate low enthalpy conditions causing the economizer damper to open Alternately when ou...

Page 36: ...As always please exercise caution and good judgement when servicing the unit Use only safe and proven service techniques Use refrigeration goggles when servicing the refrigeration circuit WARNING The refrigerant circuit has hot surfaces and the electrical voltages inside of the unit may be hazardous or lethal SERVICE MAY BE PERFORMED ONLY BY QUALIFIED AND EXPERIENCED PERSONS 4 2 Failure Symptoms G...

Page 37: ... compres sor troubleshooting section E Water on floor near unit 1 Obstruction in condensate line 2 Obstruction or leak in condensate pan 3 Unit is not level 1 Check for clog or restriction 2 Check pan for leak or blockage 3 Level unit F No space heating or reduced heating units equipped with resistance ele ments 1 Defective heating element s 2 Thermal limit open 3 Defective heater contactor 1 Chec...

Page 38: ...ostic LED which indicates the lockout fault The control board will enter into and indicate lockout if either of the fault conditions LPS or HPS occur twice The contactor must be closed before the first fault condition can be recognized by the control board The contactor will be closed 3 minutes after the unit is energized and only if cooling is required The first fault condition will open the cont...

Page 39: ...d before restarting Condenser Periodicallyinspecttheoutdoorcondensercoilandthecabinetairreliefsfordirtorobstructions Remove foreign objects such as leaves paper etc If the condenser coil is dirty it may be washed off with a commercial solvent intended for this purpose TURN OFF POWER BEFORE CLEANING Be sure that all electrical components are thoroughly dry before restoring power Use a fin comb of t...

Page 40: ...Damages caused by improper application of the product 5 Damages caused by failing to perform proper routine maintenance 6 Expenses incurred for erecting disconnecting or dismantling the product or installing the replacement part s 7 Products not installed or operated according to the included instructions local codes and good trade practices 8 Products moved from the original installation site 9 P...

Page 41: ...ded views of the unit can be found on our web site at www Marvair com Click on the Service and Parts in the menu on the left hand side of the Home page From the drop down menu select Exploded Views Once here you can select your air conditioner or heat pump The units are grouped by model and by the refrigerant R 22 or R 410A ...

Page 42: ...ur sides of the supply outlet duct flange on the unit The 1 25 4 mm clearance must extend on all sides of the supply duct for the first 3 feet 1 meter from the unit IMPORTANT Marvair requires a minimum of 1 25 4 mm from the surface of any supply ducts to combustible material for the first 3 feet 1 meter of the duct Ducting Extensions should be cut flush with the inside wall for applications withou...

Page 43: ...other heaters 6 Install the two No 10 screws in the heater assembly plate 7 Install wire harness in hole provided in drain pan and then through filter bracket and then into control box 8 Wire the heater as shown in the wiring diagram provided with the heater kit the insulated terminal ends are to be connected at the heater 9 Install pop tie in appropriate hole in back panel to secure wire 10 Insta...

Page 44: ...44 Marvair ComPac Installation Operation Manual 12 2017 Rev 16 ...