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Marvair GeoScholar Series Manual

Geoscholar heat pump 2, 2.5, 3, 3.5, 4 & 5 tons
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MODEL NO.: ______________________ SERIAL NO.: _________________
DATE OF START-UP.: _______________
MODELS VWIA, VWISA and VWCA, VWCSA
2, 2.5, 3, 3.5, 4 & 5 Tons
P.O. Box 400 • Cordele, GA 31010
156 Seedling Drive • Cordele, GA 31015
(229) 273-3636 • Fax: (229) 273-5154
Email: marvair@airxcel.com
Internet: www.marvair.com
GeoScholar
Heat Pump
(CSI 15740)
INSTALLATION AND
START-UP
WARNING
SAFETY REQUIREMENTS
• If the information in these instructions are not
followed exactly, a fire 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
qualified installer or service agency in accordance
with these instructions and in compliance with
all codes and requirements of authorities having
jurisdiction.
• Follow all safety codes.
Part # 01516
GeoScholar IS Manual 03/2019
Rev. 2

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  • Page 1 MODEL NO.: ______________________ SERIAL NO.: _________________ DATE OF START-UP.: _______________ P.O. Box 400 • Cordele, GA 31010 156 Seedling Drive • Cordele, GA 31015 (229) 273-3636 • Fax: (229) 273-5154 Email: marvair@airxcel.com Internet: www.marvair.com Part # 01516 GeoScholar IS Manual 03/2019 Rev. 2...
  • Page 2 How To Use This Manual This manual is intended to be a guide to the Marvair GeoScholar line of vertical packaged heat ® pumps. 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.

  • Page 3: Table Of Contents

    SECTION 15700 HEATING, VENTILATING AND AIR CONDITIONING EQUIPMENT INSTALLATION AND START-UP INSTRUCTIONS FOR GEOSCHOLAR HEAT PUMP (15740) TABLE OF CONTENTS Article Description Page 1.01 Tools/Field Furnished Supplies ............4 1.02 Inspection/Unpacking/Handling............4 1.03 Standard Controls ................7 1.04 Controllers ..................8 1.05 Options ..................10 1.06 Location Preparation ..............

  • Page 4: Tools/Field Furnished Supplies

    SECTION 15700 HEATING, VENTILATING AND AIR CONDITIONING EQUIPMENT 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES. •Power Drill/Driver & Extension •T25 TORX Bits •Needle Noise Pliers •Wire Stripper/Cutter...
  • Page 5 B. Immediately upon delivery to the jobsite, each GeoScholar heat pump and the appropriate additional accessories should be inspected for visible and concealed damage. All damage must be reported to the freight carrier within 15 days, on the freight carrier’s form. The GeoScholar heat pump and additional accessories should be stored inside and not exposed to outdoor weather conditions.
  • Page 6 For the GeoScholar heat pump system, the identification numbering system is shown below. The model identification number is located as shown in Figure 1. Models with an “S” indicate a 2-stage compressor. Installation is identical for the heat pumps regardless of the type of compressor. However, a 2-stage cooling thermostat must be used with all 2-stage compressor units.

  • Page 7: Standard Controls

    1.03 CONTROLS 1.03A. STANDARD CONTROLS 1. Programmable Logic Controller (PLC) Microprocessor GeoScholar heat pumps use a factory installed PLC microprocessor to control the operation, the safety switches and function options. LED’s show operational status and provide assistance with diagnosis if troubleshooting is ever required. Various control functions are field selectable.

  • Page 8: Controllers

    5. Fresh water/anti-freeeze solution switch. This two position selector switch must be set based upon the liquid used for the heat source. If the system is using fresh water, select fresh water. If the system is using an antifreeze solution, e.g. glycol, select anti-freeze solution.
  • Page 9 • Unoccupied continuous fan shutoff. 2. The direct digital control (DDC) interfaces with the building automation system (BAS) is to be defined by the specifier, in consultation with the Marvair sales ® representative. Marvair will factory install the DDC sent by the DDC manufacturer, and purchased by the customer.

  • Page 10: Options

    1.05 OPTIONS 1.05A TWO STAGE COMPRESSOR 1. Models with a “S” in the in the 5th letter of the model number have a 2-stage compressor. A two stage compressor is able to maintain more precise temperature control and humidity levels. The 2-stage operation is only operational in the cooling mode-heating and dehumidification are 1-stage.

  • Page 11: Location Preparation

    1.06 LOCATION PREPARATION WARNING THE GEOSCHOLAR HEAT PUMP MUST BE INSTALLED IN CONFORMANCE WITH ALL APPLICABLE LOCAL AND NATIONAL ELECTRICAL, PLUMBING AND BUILDING CODES. A. The GeoScholar heat pump must be installed on an outside wall for access to outside when the GeoScholar unit is providing fresh air for ventilation.
  • Page 12 label on unit. The power leads can enter the heat pump either through the bottom or rear. The locations of the knockouts for power leads are shown in Figures 4 - 6. Depending on the location of the GeoScholar heat pump relative to the outside wall, the exact rough-in location for power lines in the school room can be determined.
  • Page 13 Figure 4. GeoScholar Heat Pump Models VWCA24/30/36 Dimensional Data OUTLET DUCT 9 1/8 27 7/8 9 1/8 (ON DUCTED PLENUM ONLY) USE 28" X 8" DUCT WORK TO CONNECT TO DUCTED PLENUM FRONT 6 1/8 7 7/8 REAR 2 3/4 APPROX.
  • Page 14 Figure 5. GeoScholar Heat Pump Model VWCA40/48/60 Dimensional Data 9 1/8 29 7/8 9 1/8 OUTLET DUCT (ON DUCTED PLENUM ONLY) FRONT 9 3/4 USE 30" x 10" DUCTWORK TO CONNECT DUCTED PLENUM 9 7/8 2 1/2 9 3/4 WATER INLET/OUTLET 3 1/2 IN TOP OF UNIT 2"...
  • Page 15 Figure 6. GeoScholar Heat Pump Model VWIA24-60 Dimensional Data GeoScholar (I&S) 03/2019 15700 - 15 HVAC Equipment...

  • Page 16: Condensate Drain Line (Rough-In)

    1.08 CONDENSATE DRAIN LINE (ROUGH-IN) A. The condensate drain line can be roughed in to drain the GeoScholar heat pump from either the back (outside) or the bottom (floor). The locations for the condensate stub-outs can be determined from the cabinet knockouts identified in Figures 4/5/6. The factory installed condensate connection within the cabinet is a female PVC fitting designed for a 3/4”...
  • Page 17 A. Remove the lower front panel of the GeoScholar heat pump for access to the shipping skids. Unscrew the four hold-down lag bolts from the inside of the unit. The four lag bolts on all the the VWIA models and the VWCA24-30-36 can be accessed from the front of the unit.
  • Page 18 and 90B. The duct system must be engineered to insure sufficient air flow through the unit to prevent over-heating of the heater element. This includes proper supply duct sizing, sufficient quantity of supply registers, adequate return and filter area. Ductwork must be of correct material and must be properly insulated. The duct work must be constructed of galvanized steel with a minimum thickness of .019.

  • Page 19: Installation Through The Outside Wall

    installed. Install the outdoor air box onto the back of these GeoScholar heat pumps before sliding the unit into position. Apply a weather-proof sealant; i.e., silicone, onto the back of the GeoScholar heat pump prior to installing the outdoor air box to prevent water leaks.

  • Page 20: Electric, Condensate, Water And Wet Heat Hook-Ups

    with 1/2” pass through holes can be installed appropriately under the fastener holes in the base of the heat pump to make the system level and plumb. D. Secure the heat pump to the floor with appropriate field supplied fasteners, through the four 1/2”...
  • Page 21 THIS SYSTEM CONTAINS COMPONENTS THAT REQUIRE PHASING FOR CORRECT ROTATION. FAILURE TO OBSERVE ROTATION AND CORRECT ON START-UP WILL CAUSE DAMAGE NOT COVERED BY THE MARVAIR® WARRANTY. Scroll compressors, like several other types of compressors, will only compress in one rotational direction. The direction of rotation is not an issue with single- phase compressors since they will always start and run in the proper direction.
  • Page 22 Figure 8a. Front View of Models VWCA 24/30/36 with Front Doors Open. Figure 8b. Front View of Models VWCA 40/48/60 with Front Doors Open. GeoScholar (I&S) 03/2019 15700 - 22 HVAC Equipment...
  • Page 23 Figure 9. Typical Control Center Layout for Models VWCA 24/30/36 Note: This is a typical control box layout. The actual control box will vary with unit configurations and options. Please refer to the wiring diagram in your unit. GeoScholar (I&S) 03/2019 15700 - 23 HVAC Equipment...
  • Page 24 Figure 10a. Typical Wiring Schematic for Heat Pump Model VWCA, Single Phase Power GeoScholar (I&S) 03/2019 15700 - 24 HVAC Equipment...
  • Page 25 Figure 10b. Typical Wiring Schematic for Heat Pump Model VWCA, Three Phase Power GeoScholar (I&S) 03/2019 15700 - 25 HVAC Equipment...
  • Page 26 Figure 11a. Remote Wall Mounted Figure 11b. Humidity Controller Thermostat Wiring Detail Wiring Detail Thermostat Thermostat Field Supplied Field Supplied Seven (7) Conductor, Color Coded Seven (7) Conductor, Color Coded Thermostat Cable 18 Gauge Thermostat Cable Humidity Controller GeoScholar Heat Pumps Note: A/C’s do not have “O”.
  • Page 27 4. For models with an internal thermostat, no internal control wiring is required. The thermostat is preprogrammed at the factory to maintain a heating mode temperature of 64°F, and a cooling mode temperature of 82°F. To change these settings refer to the directions in installation instructions for the thermostat. 5.
  • Page 28 (black) and positive (red) set point test terminals on the board. Carefully, and in small increments, turn the blue knob on the potentiometer until the volt meter displays the desired milliamp voltage (temperature). Marvair recommends 70ºF and no lower than 68ºF and no higher than 78ºF. Allow the refrigerant system to stabilize for at least five minutes and adjust the temperature as desired.

  • Page 29: Ventilation System Calibration

    may also be factory installed. The front and top panels of the plenums are removable, to access the coil and make piping and wiring connections. Consult hot water plenum installation instructions for installation details or see Appendix C in back of this manual. E.
  • Page 30 An exhaust air fan speed controller is available as an option. This speed controller regulates the exhaust air motor and allows separate control of the exhaust air. Independent control allows positive pressurization of the classroom, i.e., more outside air can be brought into the classroom than what is exhausted. The fresh air door is opened and closed by the motorized drive.

  • Page 31: Control Adjustments

    C. GreenWheel ERV. Using best industry standards and practices, measure the fresh ® air that is being brought into the classroom. For units with one speed controller (std.), adjust the speed of the intake and exhaust blowers by inserting a slotted screw driver into the opening on the controller.
  • Page 32 3 seconds to 10 minutes in one minute increments. The three-second setting is used only for factory testing and should NEVER be used when installed in a classroom. Select the desired time interval by rotating the knob to the desired setting. The Marvair factory set point is 3 minutes. ®...
  • Page 33 PLC Inputs The PLC inputs are powered only by 24 VAC. The thermostat inputs are: • I0.0 - Blower signal from thermostat • I0.1 - Compressor • I0.2 - Second stage heat (heat pump function only) • I0.3 - Reversing valve (energized for cooling) (heat pump function only) The PLC has indicator LED’s that show the status of all thermostat inputs and sensors.
  • Page 34 • Q0.5 - Heat Contactor • Q0.6 - Reversing Valve (heat pump only) • Q0.7 - Lock Out Indicator. A LED indicates that a pressure switch has opened. A continually ON indicates a low pressure switch lockout. A flash rate of twice per second indicates a high pressure lockout.
  • Page 35 Low Pressure Lockout The Low Pressure Switch is designed to guard against the operation of the system in the event of a loss of refrigerant. If the Low Pressure Switch stays on for more than one minute, the system will turn off and a Low Pressure Lockout fault will be indicated by a solid on the “Q0.7”...

  • Page 36: Remote Thermostat Installation

    National Electric Code, and with local electrical codes, where they prevail. MARVAIR ® SIMPLE COMPORT THERMOSTAT CONNECTION DIAGRAM MARVAIR /SIMPLE COMFORT THERMOSTAT CONNECTION DIAGRAM ® FROM MARVAIR HEAT PUMPS FOR MARVAIR CLASSIC I™, CLASSIC II™, CLASSIC 12™ (HVP) & SCHOLAR™ HEAT PUMPS THERMOSTAT PART NUMBER 50121/ SC2010-SL 50122/ SC2210-SL 50252/...

  • Page 37: Start-Up Procedure

    2.0 START-UP PROCEDURE A. This start-up procedure applies to GeoScholar models equipped with a remote (wall mounted) thermostat and electric supplemental heat. 1. Turn the disconnect in the GeoScholar unit to “OFF” position and double check all electrical connections before applying power. 2.
  • Page 38 coming out the discharge grille is cooling. Let unit run for five minutes in this mode. If heat pump continues to run and provide cooling, this verifies that the indoor blower, compressor and outdoor blower are all running. Now slowly raise the cooling set point up toward room temperature until the pump compressor and outdoor blower motor turn off.

  • Page 39: Appendix A Ratings And Data

    APPENDIX A - RATINGS AND DATA 1.01 RATINGS / DATA Figure 1. Model VWCA Air Flow, CFM vs. ESP (Wet Coil) AIR FLOW CFM ESP (WET COIL) BASIC MODEL 0.10 0.15 0.20 0.30 0.40 0.50 ––– ––– 1150 1100 1075 1000 –––...

  • Page 40: Appendix B Base Stand Installation

    APPENDIX B - BASE STAND INSTALLATION 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES. • Power Drill/Driver and Extension •...
  • Page 41 Figure 1a. Top View of Base Stand Part Number S/02093 (For VWCA 24/30/36) Figure 1b. Top View of Base Stand Part Number S/02791 (For VWCA 40/48/60) GeoScholar (I&S) 03/2019 15700 - B-2 HVAC Equipment...
  • Page 42 Figure 1c. Top View of Base Stand (For VWIA) HOLES TO SECURE BASE STAND TO FLOOR HOLES TO HOLD SCHOLAR III TO BASE PAN Also, recheck the locations of the electrical and condensate stub-outs to ensure they are located properly, relative to the cabinet knock-out openings as shown in the Installation and Start-Up Manual, Figures 4 and 5.
  • Page 43 1.03 INSTALLATION After the base stand is located on the floor, mark the floor in the locations where 1/2” through holes go through the bottom flange of the base stand. Be sure the floor is a hard, smooth surface and the base stand is level. If the floor is carpeted, cut out a base stand “footprint,”...
  • Page 44 Figure 2a. GeoScholar Models VWCA24/30/36 Placed on Base Stand. GeoScholar (I&S) 03/2019 15700 - B-5 HVAC Equipment...
  • Page 45 Figure 2b. GeoScholar Models VWCA40/48/60 Placed on Base Stand. GeoScholar (I&S) 03/2019 15700 - B-6 HVAC Equipment...
  • Page 46 APPENDIX C - FREE BLOW & WET HEAT PLENUM INSTALLATION FOR MODELS VWCA 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES. •...
  • Page 47 1. For models VWCA 24/30/36. Part # Description S/03212 Plenum (16” high) Plenum (17 to 40” high) is special order 2. For models VWCA 40/48/60. Part # Description S/03247 Plenum (18” high) Plenum (19 to 40” high) is special order B.
  • Page 48 Remove the front plenum panel and the top plenum panel from the plenum. Retain the screws and panels for reinstallation after plenum has been installed. For freeblow plenum and standard height ducted plenums, the plenums should be installed onto the GeoScholar cabinet, prior to installing the cabinet into its final location.
  • Page 49 Figure 1. Plenums as Shipped TOP VIEW DUCT FLANGE BLANK OFF PLATE SIDE VIEW FRONT VIEW COVER PLATE FOR SIDE GRILLE C. Carefully raise the plenum into its location atop the GeoScholar cabinet as shown in Figure 2. Align the through holes (three on each side of the plenum base) with the matching holes in the top of the cabinet.
  • Page 50 Figure 2. Plenum Installation 1.04 ELECTRICAL/PIPING HOOK-UP If the freeblow or ducted plenum (without the wet heat coil) is installed as noted in Article 1.03, there is no further electrical or piping hook-up required. If, however, a wet heat coil was ordered with the plenum, follow these instructions to complete the installation.
  • Page 51 B. Piping Hook-up 1. For the hot water coil, the supply and return connections to the coil are shown in Figure 2. An optional diverter valve may also be factory installed. All other controls for the hot water system are external to the coiled plenum. All materials (piping and controls) are field supplied.
  • Page 52 APPENDIX D - INSTALLATION OF THE FREEBLOW PLENUM WITH NO HEAT FOR ALL VWIA UNITS 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES.
  • Page 53 1.03 PLENUM INSTALLATION 1. Prior to mounting the plenum on top of the GeoScholar unit, remove the front panel from the plenum. Retain the screws for reinstallation after the plenum has been installed. REMOVE AND RETAIN SCREWS REMOVE REMOVE RETAIN RETAIN SCREWS SCREWS...
  • Page 54 4. Locate the 6 holes on the side flanges (3 on each side) of the plenum. HOLE LOCATION TOP PANEL 5. Secure the plenum to the GeoScholar unit with the six ½” hex head screws. 6. Attach the front panel top the front of the plenum with the six screws. Make sure that the two screws located between the supply grilles are at the top.

  • Page 55: Appendix E Trim Strip Installation

    APPENDIX E - TRIM STRIP INSTALLATION 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES. • Power Drill/Driver and Extension •...
  • Page 56 1.04 INSTALLATION OF TRIM STRIPS Cut the trim strips to appropriate lengths to fill the gaps between the finished inside wall and the cabinet sides and top. To reduce sound transmission through the trim strips, apply acoustical insulation on the side of the strips that face the outdoor air box.

  • Page 57: Appendix F Wall Bracket Installation

    APPENDIX F - WALL BRACKET INSTALLATION 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES. • Power Drill/Driver and Extension •...
  • Page 58 1.04 INSTALLATION OF THE WALL BRACKETS CAUTION FOR HEAT PUMP WITH PLENUMS, BE SURE TO INSTALL WALL BRACKETS ON THE CABINET (VERSUS THE PLENUM) TO ENSURE MAXIMUM HOLDING STRENGTH. A. Measure and mark on the inside surface of the wall where the two anchors for each bracket are to be placed.

  • Page 59: Appendix G Outdoor Louver/Collar Installation

    APPENDIX G - OUTDOOR LOUVER/COLLAR INSTALLATION 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES. • Power Drill/Driver and Extension •...
  • Page 60 WARNING BEFORE INSTALLING, SERVICING OR MAINTAINING THIS EQUIPMENT, SWITCH THE ELECTRIC POWER TO “OFF” AT THE DISCONNECT LOCATED BEHIND THE KEY LOCKED DOOR ON THE LOWER FRONT PANEL. FAILURE TO DO THIS COULD RESULT IN PROPERTY DAMAGE, BODILY INJURY OR DEATH. 1.03 PREPARATION OF GEOSCHOLAR HEAT PUMP FOR LOUVER/COLLAR INSTALLATION Note: Custom louvers may have installation requirements different from louvers with...
  • Page 61 1.04 INSTALLATION OF LOUVER/COLLAR ASSEMBLY, LOUVER AND COLLAR A. Louver/Collar Assembly The preassembled louver/collar is fastened from the outside of the building in one assembly. 1. The louver/collar assembly is fastened directly to the air box with six screws supplied with the louver/collar. Prior to installing the louver, apply caulk around the perimeter flange of the outdoor air box.

  • Page 62: Appendix H Sound Reduction Panel

    APPENDIX H - SOUND REDUCTION PANEL (Models VWCA only) 1.01 TOOLS/FIELD FURNISHED SUPPLIES WARNING TO AVOID PERSONAL INJURY, ADEQUATE PROTECTIVE CLOTHING MUST BE WORN AND PRECAUTIONS IN HANDLING AND INSTALLING THIS EQUIPMENT MUST BE PRACTICED AT ALL TIMES. • Power Drill/Driver and Extension •...
  • Page 63 Figure 1. Sound Reduction Panel Installation P/90012 #10 x 1/2" TORX HEAD SCREW 90934 10-32 x 1/4" ZINC PLATED MACHINE SCREW 90936 CAPTIVE SCREW RETAINER RING 90931 J TYPE RECEPTACLE FOR OUICK-OPENING CAPTIVE SCREW 90930 OUICK-OPENING CAPTIVE SCREW-SLOTTED HEAD 90932 METAL IN-LINE LIFT-OFF HINGES SD/04200 SOUND PANEL FRONT DOOR ASSY...
  • Page 64 WARNING BEFORE INSTALLING, SERVICING OR MAINTAINING THIS EQUIPMENT, SWITCH THE ELECTRIC POWER TO “OFF” AT THE DISCONNECT LOCATED BEHIND THE KEY LOCKED DOOR ON THE LOWER FRONT PANEL. FAILURE TO DO THIS COULD RESULT IN PROPERTY DAMAGE, BODILY INJURY OR DEATH. A.
  • Page 65 The heaters are installed on top of the heat pump over the supply air blower’s discharge. Marvair recommends that the plenum be installed prior to installing the heaters to minimize the chance of damaging the heaters when installing the plenum.
  • Page 66 C. Secure the assembly with two screws. D. Pull the power wires from inside the heat pump, through the electrical bushing. Connect the wires as shown in the electrical diagram that is on the heat pump. E. Check to see that all connections are secure and replace the front cover of the plenum.

  • Page 67: Appendix J Check, Test And Start Form

    APPENDIX J - TEST, CHECK AND START FORM GeoScholar Water Source Heat Pump Equipment Check, Test and Start Form Installation Data Job Name Check, Test & Start Date City or Town State Who is Performing CTS Equipment Type (check all that apply) General Contractor Closed Loop Open Loop...
  • Page 68 GeoScholar (I&S) 03/2019 15700 - J-2 HVAC Equipment...

This manual is also suitable for:

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