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Marvair Scholar III VAISA Installation And Start-Up Instructions Manual

Heat pump & air conditioner
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INSTALLATION AND
START-UP
Model VAISA
2, 2.5, 3, 3.5, 4 & 5 Tons
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.
MODEL NO.: ______________________ SERIAL NO.: _________________
DATE OF START-UP.: _______________
Marvair Division of the AIRXCEL
P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015
The most current version of this manual can be found at www.Marvair.com.
WARNING
Manufactured By:
(229) 273-3636 • Fax (229) 273-5154
www.Marvair.com | www.EubankWallmount.com
Scholar III™
Heat Pump & Air Conditioner
(CSI 15740)
Scholar III™
Commercial Group
®
Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8
P/N 01564

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Summary of Contents for Marvair Scholar III VAISA

  • Page 1 P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015 (229) 273-3636 • Fax (229) 273-5154 www.Marvair.com | www.EubankWallmount.com The most current version of this manual can be found at www.Marvair.com. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8 P/N 01564...
  • Page 2 How To Use This Manual This manual is intended to be a guide to the Marvair Scholar III™ line of vertical packaged heat pumps and ® air conditioners. This manual covers the installation and start-up of the Scholar III heat pumps and air conditioners, models VAISA, with two stage compressors.

  • Page 3: Table Of Contents

    Appendix A Ratings and Data .................36 Appendix B Base Stand Installation ..............37 Appendix C Free Blow/Plenum Installation............40 Appendix D Trim Strip Installation ..............43 Appendix E Outdoor Louver/Collar Installation..........45 Appendix F Electric Heater Installation ............48 Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 4: Tools/Field Furnished Supplies

    The Scholar III™ heat pump or air conditioner and additional accessories should be stored inside and not exposed to outdoor weather conditions. Do not remove equipment from packing until it is ready to be installed. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 5 V = 2008 J = 2020 Y = 2009 K = 2021 Z = 2010 L = 2000 A = 2011 M = 2001 B = 2012 N = 2002 C = 2013 Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 6 Figure 1. General External Component Identification and Access to Scholar III™ Heat Pump or Air Conditioner RETURN AIR ONE ON EACH SIDE OUTDOOR AIR BOX INTAKE & EXHAUST OF CONDENSER AIR AND FRESH AIR REAR CONDENSATE ACCESS Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 7: Standard Controls

    (or wet heat) turns on to heat the classroom. The temperature set point can be adjusted in the field for local conditions. When the outdoor thermostat activates wet heat, the compressor simultaneously turns off. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 8: A Thermostats & Sub-Bases

    Adjustable max. setpoint for heating and min. adjustable setpoints for cooling. Adjustable temperature differential. Keypad lockout. Status LED. °F or °C selectable. Title 24 compliant. For use with models VAIA and VAISA. Marvair P/N 50107. 2. Digital, 7 day, 2 occupied & 2 unoccupied periods for each day of the week programmable thermostat.

  • Page 9: B Optional Controls

    5. 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: Location Selection And Preparation

    *When 2”high base stand is used, the C* dimension is specified. The use of a base stand with a height other than 2” will change the C height accordingly. Dimensions are in inches. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 11: Power And Control Wiring (Rough-In)

    1/2” from the classroom floor to allow the Scholar III heat pump and air conditioner to slide into the wall opening. Reference Figure 3 as noted above, for control wiring entry points into the cabinet. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 12 Figure 3. Scholar III™ Heat Pump and Air Conditioner Dimensional Data Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 13: Condensate Drain Line (Rough-In)

    (EC) blower motor to distribute the conditioned air throughout the classroom. The EC motor automatically adjusts its speed to maintain the proper air flow over a wide variety of external static pressures in an air Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 14 Scholar III heat pump or air conditioner into place. IMPORTANT BE SURE TO SEAL THE OPEN AREAS BETWEEN LINES ENTERING THE SCHOLAR III™ CABINET AND THE KNOCKOUT OPENINGS, TO PREVENT AIR LEAKAGE. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 15: Installation Through The Outside Wall

    B. To minimize sound in the classroom, insulate all four sides of the outdoor air box that is internal to the classroom with the following: Layer 1: 1/2” Rubatex Layer 2: 1-1/2: Duct Board Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 16 F. If appropriate, install wall brackets to the inside surface of the outside wall and to the cabinet of the Scholar III™ unit, at this time. Check instructions with wall brackets for installation or see Appendix E at end of this manual. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 17: Electric, Condensate And Wet Heat Hook-Ups

    Verification of proper rotation is made by observing that the Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 18 Figure 5. Route wires into the terminal strip compartment through the openings provided. Connect wiring to the terminal strip as shown in Figure 9 for a remote, wall mounted thermostat installation. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 19 Figure 6. Typical Control Center Layout for Scholar III™ Due to the variety of options, the control center in your unit may be different from the photo. Always refer to the electrical schematic in your unit. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 20 Figure 7. Typical Wiring Schematic for Heat Pump Single Phase Power Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 21 Figure 8. Typical Wiring Schematic for Heat Pump Three Phase Power Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 22 V2. When the field supplied contacts between V1 and V2 are closed the ventilation package will operate when the Indoor Fan/Blower is energized. 4. For models with an internal thermostat, no internal control wiring is required. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 23: Ventilation System Calibration

    B. Two position motorized damper and PowerVent Fresh Air Systems. The two position (open & closed) ventilation module is equipped with a motorized damper and pressure relief, and provides up to 450 cfm of outside air. The damper position can Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 24 FULL OPEN B is securely fastened at the desired opening. 420-450 CFM Note: Once calibrated, the manual fresh air system door remains at the set opening at all times. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 25: Control Adjustments

    Be programmed remotely or with a removable program storage device The PLC is factory wired and tested and typically no adjustments or changes are required to the PLC when the Scholar III™ heat pump or air conditioner is installed. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 26 Stop is no output/non-operational. The Anti-short Cycle Timer (ASCT) is located to the far left of the switch. The anti-short cycle timer prevents the compressor from destructive short cycling by Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 27 30 minutes. When turned completely to the right (clockwise), the time interval is 90 minutes. The knob allows setting the defrost time anywhere between 30 and 90 minutes, i.e., mid-way between the 30 and 90 minutes is 60 minutes. The Marvair ®...
  • Page 28 The defrost cycle is based upon both time (see defrost timer) and outdoor coil temperature. (heat pump only) PLC Outputs An output is a signal from the PLC to the Scholar III™ heat pump or air conditioner Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 29 If the W2 LED is on, indicating that the thermostat is calling for second stage heat and the ODS indicator is not and the outside temperature is not below the ODS set point, the second stage heat (HTR) will not come on. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 30 When this occurs, the system will run for five seconds then set a High Pressure Lockout. This lockout condition shuts the system off and flashes the “A” indicator quickly at a rate of twice per second. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 31 If system is calling for calling for function function and an and an external external control is control is not utilized. not utilized. X – Indicates that this function should be on. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 32: Remote Thermostat Installation

    B. The thermostat should be wired to the terminal strip in the Scholar III™ heat pump or air conditioner in accordance with Figure 9, and in accordance with the thermostat instructions, National Electric Code, and with local electrical codes, where they prevail. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 33 ® MARVAIR /SIMPLE COMFORT THERMOSTAT CONNECTION DIAGRAM FOR MARVAIR CLASSIC I™, CLASSIC II™ & SCHOLAR™ HEAT PUMPS THERMOSTAT PART NUMBER 50121/ SC2010-SL 50122/ SC2210-SL 50252/ SC4811-SL 50107/ SC5811-SL LOW VOLTAGE CLASSIC I & TERMINAL BOARD SCHOLAR W/O REHEAT CLASSIC II...

  • Page 34: Start-Up Procedure

    Now slowly raise the cooling set point up toward room temperature until the pump compressor and outdoor blower motor turn off. This will be audible. The indoor blower will continue to run and turn off after 90 seconds. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 35 Raise the set point slowly and the indoor blower and the electric supplemental heat will turn on at the same time. Lowering the set point slowly should turn the electric heat off. The indoor blower will turn off 90 seconds later. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 36: Appendix A Ratings And Data

    Standard return air filter has MERV rating of 7. Optional filters are available with MERV ratings of 8 and 13. Figure 3. Shipping Weight (pounds) BASIC MODEL VOLTAGE - 230 1020 1020 1030 1045 1060 VOLTAGE - 460 1045 1045 1055 1070 1085 Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 37: Appendix B Base Stand Installation

    The unit will be located directly on top of the base stand, and the base stand will be anchored to the floor. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 38 Lastly, remeasure to be sure that the wall opening for the Scholar III™ heat pump and air conditioner air box is located properly, taking the height of the base stand into account, before proceeding to install the base stand. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 39 Tighten bolts evenly to affix the cabinet firmly to base stand. IMPORTANT DO NOT OVERTIGHTEN MACHINE BOLTS OR CABINET BASE WILL BOW. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 40 On extended height ducted plenums, the Scholar III heat pump or air conditioner may have to be installed in its final location before the ducted plenum is fastened to the top of the cabinet. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 41: Appendix C Free Blow/Plenum Installation

    3. After the front panel has been removed, lift the plenum onto the top of the Scholar III unit. WARNING THE PLENUM IS HEAVY. USE CARE WHEN PLACING THE PLENUM ON TOP OF THE SCHOLAR III HEAT PUMP OR AIR CONDITIONER. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 42 Galvanized metal duct extensions should be used to simplify connections to ductwork and grilles. Use fabric boots to prevent the transmission of vibration through the duct system. The fabric must be U.L. rated to a minimum of 197°F. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 43: Appendix D Trim Strip Installation

    Check the cabinet for vertical plumb and parallelism to the inside of the finished wall prior to installing the trim strips. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 44 CAREFULLY MARK, INDENT AND DRIVE SCREWS THROUGH THE TRIM STRIPS TO AVOID DAMAGING THE PAINTED SURFACES. Field supplied screws should be self tapping zinc coated sheet metal type, 1/2” long with head color of satin aluminum, to match the cabinet finish. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 45: Appendix E Outdoor Louver/Collar Installation

    THIS EQUIPMENT MUST BE INSTALLED IN CONFORMANCE WITH ALL APPLICABLE LOCAL AND NATIONAL ELECTRICAL, PLUMBING AND BUILDING CODES. THIS EQUIPMENT SHOULD BE INSTALLED AND SERVICED ONLY BY A TRAINED PROFESSIONAL HVAC SERVICE PERSON. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 46 1. The louver/collar assembly is fastened directly to the air box as shown in Figure 2, with six screws supplied with the louver/collar. Prior to installing the louver, apply caulk around the perimeter flange of the outdoor air box. Be careful Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 47 5. Some applications may require that the louver collar be fastened to the exterior wall. Installer must drill required holes in the collar as located in Figure (1-1). OUTSIDE LOUVER WITH COLLAR Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...

  • Page 48: Appendix F Electric Heater Installation

    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 49 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. Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8...
  • Page 50 ® available upon request. A complete warranty statement can be found in each product’s Installation/Operation Manual, on our website or by contacting Marvair at 229-273-3636. As part of the Marvair continuous improvement program, specifications are subject to change without notice.

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