Marvair Scholar QV VACA Instructions and recipes

Scholar QV™
Heat Pump & Air Conditioner
(CSI 15740)
Marvair Scholar QV™ VACA/VAHA I&S Manual 3/2019 Rev.18
P/N 01274
MODEL NO.: ______________________ SERIAL NO.: _________________
DATE OF START-UP.:_______________
Models VACA/VACSA & VAHA/VAHSA
2, 2.5, 3, 3.5, 4 & 5 Tons
INSTALLATION AND
START-UP
WARNING
SAFETY REQUIREMENTS
• If the information in these instructions
are not followed exactly, a re 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 qualied 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.
Manufactured By:
Marvair Division of the AIRXCEL®
P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015
[phone] • Fax [phone]
www.Marvair.com
The most current version of this manual can be found at www.Marvair.com.
Scholar QV™

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 2
How To Use This Manual
This manual is intended to be a guide to the Marvair®Scholar QV™ line of vertical packaged heat pumps and
air conditioners. 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.
If you are installing the Scholar QV™ heat pump or air conditioner, rst read the entire manual and Appendices
for any of the options and accessories before beginning the installation. The Appendices describe the installation of
the base stand, the plenum, trim strips, wall brackets, outdoor louvers and the sound reduction panel.
If a malfunction occurs, follow this troubleshooting sequence:
1. Make sure you understand how the Scholar QV™ unit works.
2. Identify and correct installation errors.
3. If you are still unable to correct the problem, contact the Factory at 1-800-841-7854 for additional
assistance.
Please read the following “Important Safety Precautions” before beginning any work. Failure to follow
these rules may result in death, serious bodily harm, property damage and damage to the equipment.
Important SafetyPrecautions
1. USE CARE when LIFTING or TRANSPORTING equipment.
2. TRANSPORT the UNIT UPRIGHT. Laying it down on its side may cause oil to leave the compressor, re-
sulting in DAMAGE upon START-UP.
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. OBSERVE and COMPLY with ALL applicable PLUMBING, ELECTRICAL, and BUILDING CODES &
ordinances.
5. SERVICE may be performed ONLY by QUALIFIED and EXPERIENCED PERSONS.
* Wear safety goggles when servicing the refrigeration circuit
* Beware of hot surfaces on refrigerant circuit components
* Beware of sharp edges on sheet metal components
* Use care when reclaiming or adding refrigerant
6. Use COMMON SENSE - BE SAFETY CONSCIOUS
This is the safety alert symbol . When you see this symbol on the Scholar unit and in the instruction manuals
be alert to the potential for personal injury. Understand the signal word DANGER, WARNING and CAUTION.
These words are used to identify levels of the seriousness of the hazard.
DANGER Failure to comply will result in death or severe personal injury and/or property damage.
WARNING Failure to comply could result in death or severe personal injury and/or property damage.
CAUTION Failure to comply could result in minor personal injury and/or property damage.
IMPORTANT Used to point out helpful info that will result in improved installation, reliability or
operation.
Specications subject to change without notice.
© 3/2019 Marvair®, Division of AIRXCEL®, Inc.

15700 - 3 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
SECTION 15700
HEATING, VENTILATING AND AIR CONDITIONING EQUIPMENT
INSTALLATION AND START-UP INSTRUCTIONS
FOR SCHOLAR QV™ HEAT PUMPS AND AIR CONDITIONERS (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
1.04A Thermostats & Sub-bases..............................................................8
1.04B Optional Controls .........................................................................10
1.05 Location Preparation....................................................................12
1.06 Power and Control Wiring (Rough-In)..........................................13
1.07 Condensate Drain Line (Rough-In) ..............................................16
1.08 Wet Heat (Rough-In)....................................................................16
1.09 Preparation of the Scholar QV™ Units ........................................16
1.10 Installation Through the Outside Wall ..........................................18
1.11 Electric, Condensate and Wet Heat Hook-ups.............................19
1.12 Ventilation System Calibration .....................................................30
1.13 Control Adjustments.....................................................................32
1.14 Remote Thermostat Installation ...................................................42
1.15 Start-up Procedure.......................................................................43
1.16 Exploded Views and Parts Lists...................................................45
Appendix A Ratings and Data .........................................................................46
Appendix B Base Stand Installation ................................................................47
Appendix C Wet Heat/Plenum Installation.......................................................51
Appendix D Trim Strip Installation ...................................................................57
Appendix E Wall Bracket Installation...............................................................59
Appendix F Outdoor Louver/Collar Installation................................................61
Appendix G Sound Reduction Panel ...............................................................65

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 4
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
•Spirit Level
•Tape Measure
•Screwdriver with Slotted Bit
•Caulk Gun
•Sealant Caulk (tube)
•Wire Nuts for Power and Control Wiring Gauges
•Supplies to Install PVC Condensate Drain
•Floor Fasteners for Cabinet (4 required for 1/2” pass through holes) - Appropriate Drivers
for Floor Fasteners
•Supplies to Install Wet Heat Coil (Hot Water) (if appropriate)
•25 Ft. of Polyurethane Foam Strips, 1” Wide x 1/2” Thick, Adhesive Backing, for Scholar
QV/Wall Interface.
1.02 INSPECTION/UNPACKING/HANDLING
A. The Scholar QV™ heat pumps and air conditioners are shipped to the job site on 4x4
wood base framing, and enclosed in shrink wrap.
Freeblow and ducted plenums are shipped on wooden skids and enclosed in shrink
wrap.
Outdoor louvers/collar assemblies, louvers and collars are shipped in corrugated
containers.
Base stands are shipped on a wooden skid and are enclosed in shrink wrap.
Trim pieces are enclosed in corrugated carton and strapped to a wooden skid.
The sound reduction panel is shipped in a wooden crate after being shrink wrapped.

15700 - 5 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
B. Immediately upon delivery to the jobsite, each Scholar QV™ heat pump or air
conditioner and the appropriate additional accessories should be inspected for
visible and concealed damage. All damage must be reported to the freight car-
rier within 15 days, on the freight carrier’s form.
The Scholar QV™ heat pump or air conditioner and additional accessories should be
stored inside and not exposed to outdoor weather conditions. Do not remove equip-
ment from packing until it is ready to be installed.
WARNING
DO NOT STACK THE UNIT OR ANY ACCESSORIES ON TOP OF ONE ANOTHER.
THE UNITS SHOULD ALWAYS REMAIN IN THE UPRIGHT POSITION WHEN BEING
SHIPPED, STORED, HANDLED OR INSTALLED.
DO NOT STORE THE UNIT OR ACCESSORIES IN OUTDOOR
WEATHER CONDITIONS.
IF IT IS NECESSARY TO TILT THE SCHOLAR QV™ HEAT PUMP OR AIR CONDITIONER
WHILE MOVING IT DURING INSTALLATION, BE SURE THE TOP END IS ALWAYS ABOVE
THE BOTTOM BY AT LEAST 30 INCHES. THE UNIT SHOULD NOT BE ALLOWED TO
REMAIN IN THE TILTED POSITION ANY LONGER THAN REQUIRED FOR THE ACTUAL
MOVING PROCESS.
C. Note the unit identication label is located on left side cabinet panel at the lower front
corner, as shown in Figure 1. The identication label has the model and serial num-
ber on it and the type of refrigerant and amount of refrigerant charge.
IMPORTANT
WHEN THE HEAT PUMP OR AIR CONDITIONER IS INSTALLED, MODEL NUMBER AND
SERIAL NUMBERS ARE TO BE RECORDED ON THE COVER OF THIS
MANUAL AND MAINTAINED IN A LOCATION FOR IMMEDIATE ACCESS, WHEN
REQUESTING FURTHER INFORMATION CONCERNING THIS EQUIPMENT.
Serial Number Date Code
A = January E = May J = September D = 2014 H = 2018
B = February F = June K = October E = 2015 I = 2019
C = March G = July L = November F = 2016 J = 2020
D = April H = August M = December G = 2017 K = 2021

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 6
For the Scholar QV™ heat pump or air conditioner system, the identication number-
ing system is shown below. The model identication number is located as shown in
Figure 1.
Vertical Air
Indoor Source
Nominal CoolingCompressor Option
System Type
HP = Heat Pump
AC = Air Conditioner
C= Standard
Efficiency
H= High
Efficiency
Power Supply
A=208/230V,1,60Hz
C= 208/230V,3,60Hz
D=460V,3,60Hz
Configuration
N=Manual Damper (std)
H=GreenWheel®ERV
B= Motorized Damper
J= Power Vent with
Motorized Damper
Special Options
G= Hot Gas Reheat/Dehumidification
• • • • •
VA • •QV
Configuration
QV
Refrigerant
R-410A
A
24 = 24,000 BTUH
30 = 29,600 BTUH
36 = 35,000 BTUH
40 = 39,500 BTUH
49 = 46,000 BTUH
60 = 54,000 BTUH
S= 2-Stage
Heat – kW
000 - No Heat
050 = 5 kW
075 = 7.5 kW
100 = 10 kW
150 = 15 kW
990 = Hot Water
Series
1= Revision #1
•
S
Figure 1. General External Component Identication and Access to Scholar QV™
Heat Pump or Air Conditioner
Front Air Supply Grille Side Air Supply Grille
Scholar QV
Heat Pump
Model VACA
Freeblow Plenum
(shipped separately)
Air Return Grille
Exhaust Air Grille
Identication Plate
(lower front corner)
Access to:
• electrical
control center
• ventilation system
• disconnect
• condensate disposal
Upper Front Panel

15700 - 7 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
1.03 STANDARD CONTROLS
A. Programmable Logic Controller (PLC) Microprocessor
Scholar QVTM 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 eld selectable. The PLC is also capable of communicating to
PLC’s in other Scholar units to allow run time leveling and does not require additional
equipment installed in the Scholar QV unit. The PLC microprocessor provides im-
proved reliability because of the reduction of components, the components utilized
are more durable and the control box wiring has been simplied. Pertinent statistical
data about the life of the refrigeration system can be accessed through the PLC.
The PLC microprocessor provides for the following control and operation functions:
• Anti-Short Cycle Timer - Prevents the compressor from destructive short cy-
cling due to momentary power interruptions. One of three time intervals can be
eld selected.
• Defrost Timer (heat pumps only) - Adjustable defrost control that is based
upon both time and temperature. The time interval is adjustable from 30 to 90
minutes in one minute increments.
• BAS Control Relay - Provides 24 VAC coil to control operation from Build-
ing Automation System (BAS). Note - an additional BAS control relay can be
added when 120 or 240 VAC coils are required.
B. High and Low Refrigerant Pressure and Loss of Charge Switches
These switches render the compressor and outdoor fan motor inoperative whenever
the limits of the pressure switches are exceeded. In the event of high pressure, the
Scholar QVTM heat pump or air conditioner will turn off and lockout.
The low pressure (A/C) and loss of charge (HP) switch is bypassed for 8-1/2 minutes
during each start-up. The system will lockout if the low pressure switch opens three
times within one hour or if it does not reset within 8-1/2 minutes of the Scholar QVTM
heat pump or air conditioner start-up.
The high and low pressure and loss of charge switches are resettable at the wall
thermostat or by turning power off and then on to the Scholar QVTM heat pump or air
conditioner. A fault LED located on the PLC indicates that a lockout has occurred
and whether it is due to high or low refrigerant pressure.
C. Heat Related Controls
The outdoor thermostat (heat pump only), factory set at 40°F, determines the tem-

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 8
perature at which the supplemental electric heat (or wet heat) turns on to heat the class-
room. The temperature set point can be adjusted in the eld for local conditions. When
the outdoor thermostat activates wet heat, the compressor simultaneously turns off.
The electric heat control (heat pump only) allows the user to select whether the
electric heat operates simultaneously with the compressor. On the 2, 2 ½, 3 and 3
½ ton heat pumps, the units are wired at the factory for simultaneous operation. For
non-simultaneous operation, a wire is moved from one terminal to another in the con-
trol box. On 4 & 5 ton units, a toggle switch in the control box controls this function. In
the “NORM” position, electric heat can operate simultaneously with the compressor.
In the “S circuit” position, electric heat does not operate any time the compressor is
operating.
The electric heat during defrost (heat pump only) allows the user to select
whether electric heat operates when the heat pump enters into the defrost mode. On
the 2, 2 ½, 3 and 3 ½ ton heat pumps, the units are wired at the factory to prevent
the electric heaters from operating during the defrost mode. For operation during
defrost, a wire is moved from one terminal to another in the control box. On 4 & 5 ton
units, a toggle switch in the control box controls this function. In the “EHDD” position,
electric heat will operate in the defrost mode. In the “NORM” position, electric heat
does not operate in the defrost mode. NOTE: for operation of the electric heat during
defrost, the electric heat control must be congured to allow simultaneous operation
of the electric heat and the compressor.
D. The indoor blower fan speed control provides adjustable air volume from the
indoor blower.
IMPORTANT
MINIMUM AIR FLOW IS REQUIRED FOR PROPER OPERATION.
E. The motorized fresh air damper with PowerVent and GreenWheel® ERV ventila-
tion options are equipped with a fresh air fan speed control. The fresh air fan speed
control controls both the ventilation intake and exhaust blowers together, automati-
cally balancing the intake and exhaust cfm up to 450 cfm.
1.04A THERMOSTATS, THERMOSTAT GUARDS AND HUMIDITY CONTROLLERS
A. Scholar QV™ heat pumps with two stages of heat have the following thermostats
available.
1. Digital, 7 day, 5-2 and 5-1-1 day programmable thermostat (p/n 50107).
Two stage heat/Two stage cool. Manual or auto changeover. Fan: Auto & On.
Permanent retention of setting on power loss. Field adjustable temperature
calibration. 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.
2. Digital, non-programmable thermostat (p/n 50252) Two stage heat/Two
stage cool. Manual or auto changeover. Fan: Auto & On. Permanent retention

15700 - 9 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
of setting on power loss. Field adjustable temperature calibration. Adjustable
max. setpoint for heating and min. adjustable setpoints for cooling. Adjustable
temperature differential. Keypad lockout. Status LED. °F or °C selectable.
3. Internal electronic programmable thermostat (p/n S/02792) (factory installed)
with automatic changeover, has two stages of heating and one stage of cooling
and a fan switch. System mode switch has OFF, COOL, AUTO, HEAT, and
EM.HT. settings. Fan mode switch has OFF and AUTO settings. This thermostat
may be used with systems that have no heat, electric resistance, a hot water coil
coil.
4. Digital, 7 day, 2 occupied & 2 unoccupied periods for each day of the week
programmable thermostat (p/n 50248). Three stage heat/Three stage cool.
Manual or auto changeover. Fan: Auto & On. Ten year retention of programming
settings and 48 hour clock and day settings on power loss. Adjustable max. set-
point for heating and min. adjustable setpoints for cooling. Adjustable temperature
differential. Keypad lockout. Status LED. °F or °C selectable. Optional remote
sensors for outdoor air, supply air and humidity. Title 24 compliant.
5. The direct digital control (DDC) interfaces with the building automation system
(BAS) is to be dened by the specier, in consultation with the Marvair® sales
representative. Marvair will factory install the DDC sent by the DDC manufactur-
er, and purchased by the customer. Due to the specialized nature of DDC con-
trols applied to specic building automation systems, pricing for the Scholar QV™
Heat Pump with custom controls will be based on the customer requirements for
additional controls components (materials and installation) and engineering by
Marvair.
6. MAR7000 Energy Management System provides a number of functions while remaining
extremely cost sensitive. For a complete description of the operation and features of the
MAR7000 EMS, please see the MAR7000 Product Data Sheet.
B. Scholar QV™ air conditioners or heat pumps with one stage of heat.
1. Digital, non-programmable thermostat (p/n 50121). One stage heat, one
stage cool. Fan switch: Auto & On. Manual changeover system switch: Cool-Off-
Heat. Low temperature protection. °F or °C selectable. Thirty minute power loss
memory retention.
2. Digital, seven day programmable thermostat (p/n 50123). One stage heat, one
stage cool. Fan switch: Auto & On. Auto-changeover. Keypad lockout. Non-volatile
program memory. Title 24 compliant.
3. Digital, non-programmable thermostat (p/n 50186). One stage cool/one stage
heat. Manual or auto changeover. Fan mode: Auto or On. Permanent retention
of settings upon power loss. Field adjustable temperature calibration. Max heat
and minimum cool set points. Adjustable temperature differential. Remote sensor
capable. Keypad lock out. Status LED. °F or °C selectable.

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 10
C. Thermostat guards.
1. Clear thermostat guard with keylock & clear plastic cover & base (p/n
50092). For use with 50121, 50123, 50186, 50107 & 50252 thermostats.
2. Clear thermostat guard with keylock & clear plastic cover & base (p/n 50119).
For use with 50248 thermostat.
D. Humidity Controller
1. Digital humidity controller, (p/n 50254). To be used with units with hot gas or
electric reheat. Programmable dehumidistat, ventilation control. Time of day can
be set for dehumidifier or ventilation to run. Permanent memory retention of set
points. Humidity sensor can be field calibrated. High & low dehumidification set
points. Outdoor temperature and humidity sensor included. ºF or ºC selectable.
1.04B OPTIONAL CONTROLS
A. All units have the following control options available.
1. The spring wound timer is a eld installed kit used to enable operation of the
heat pump for up to six hours, or override the building automation system. (p/n
08557)
2. The hard start kit is eld installed and used on single phase power models to
overcome hard starting conditions. Note: Hard start kits are generally not recom-
mended for use on scroll compressors.
3. The motorized fresh air damper with PowerVent and GreenWheel® ERV
ventilation options can be equipped with an exhaust fan air speed control, which
controls the ventilation exhaust blower independent of the fresh air intake blower.
4. The condensate pan and drain line heaters are required for heat pump instal-
lations north of the 34° latitude line (see gure below) and other sites where
condensate may freeze. The pan heaters prevent the condensate from freezing
in the condensate pan and the drain line heaters prevent it from freezing in the
drain lines. These heaters are factory installed and no eld installation is
required. See price pages for part numbers.

15700 - 11 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
Pan Heaters and Condensate Heaters must be installed in units North of the 34° North
Latitude Line Shown and Noted by the Following Cities: Columbia, SC; Atlanta, GA;
Gadsden, AL; Tupelo, MS; Pine Bluff, AR; Lubbock, TX; Roswell, NM; Phoenix, AZ;
and Los Angeles, CA.
34oNorth Latitude
34oNorth Latitude

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 12
1.05 LOCATION PREPARATION
WARNING
THE SCHOLAR QV™ HEAT PUMP AND AIR CONDITIONER MUST BE INSTALLED
IN CONFORMANCE WITH ALL APPLICABLE LOCAL AND NATIONAL ELECTRICAL,
PLUMBING AND BUILDING CODES.
A. The Scholar QV™ heat pump and air conditioner must be installed on an outside wall
for access to outside air. The wall opening dimensions are shown in Figure 2. It must
not interfere with any windows or doors to the outside. The outdoor air path must not
be impeded by shrubbery or other obstructions. Do not locate the Scholar QV heat
pump or air conditioner where noxious fumes or gas can be drawn in from the out-
door air and introduced in the classroom.
The Scholar QV™ heat pump or air conditioner must be installed on a hard, level,
smooth surface such as concrete, wood or tile. Do not install the unit on a carpeted
surface.
To remove carpet from where the “footprint” of the unit will be, when installed, care-
fully measure, cut and remove carpet from an area based on the dimensions of the
Scholar QV cabinet as described in Figures 3 and 4; and allowing for any offset or
standoff from the nished interior surface of the wall.
Prior to installation of the Scholar QV™ heat pump or air conditioner, provisions are
to be made for the following, as appropriate.
1. Wall opening dimensions for the Scholar QV™ heat pump and air conditioner
are as shown in Figure 2. The unit is designed for installation through a 14 inch
thickness nished wall. For nished wall depth less than 14 inches, the unit will
stand off from the interior nished wall and it will be necessary to order and install
trim pieces to provide a nished, color coordinated enclosure that ts ush to the
interior wall.
Figure 2. Wall Opening Dimensions for Scholar QV™ Heat Pump and Air Conditioner.
MODEL 24/30/36/40 49 60
A 36.75 47.25 47.25
B 48.00 59.75 59.75
C 32.00 32.00 32.00
C* 36.00 36.00 36.00
*When 4”high base stand is used, the C*
dimension is specied.
Dimensions are in inches.

15700 - 13 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
1.06 POWER AND CONTROL WIRING (ROUGH-IN)
A. Line voltage power supply must be sized to provide adequate power for the opera-
tion of the specic model heat pump and, if chosen, the electric heat option. Informa-
tion on line power requirements, line sizing and fuse sizing is shown on data label on
unit. The power leads can enter the heat pump or air conditioner either through the
bottom or rear. The locations of the knockouts for power leads are shown in Figures
3 and 4. Depending on the location of the Scholar QV heat pump or air conditioner
relative to the outside wall, the exact rough-in location for power lines in the school
room can be determined. Six feet of power line should be available inside the cabi-
net for routing and connecting the power lines, after the Scholar QV unit is installed.
If entry is from bottom, the stub-out should be no higher than 1/2” from the classroom
oor to allow the unit to slide into the wall opening.
IMPORTANT
IF “S CIRCUIT” POSITION IS SELECTED ON THE ELECTRIC HEAT CONTROL (SEE
ARTICLE 1.11), LOWER MINIMUM CIRCUIT AMPACITY MAY BE PERMITTED.
B. Low voltage wiring can be roughed in to either the back (outside wall) or bottom
(oor) of the cabinet. Six feet of low voltage wire should be available for routing and
termination within the unit. If the entry is from the bottom, the stub-out should be no
higher than 1/2” from the classroom oor to allow the Scholar QV heat pump and air
conditioner to slide into the wall opening. Reference Figures 3 and 4 as noted above,
for control wiring entry points into the cabinet.

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 14
Figure 3. Scholar QV™ Heat Pump and Air Conditioner Models VAHA24/30/36/40
Dimensional Data
BASIC MODEL24303640 VOLTAGE - 230 565 585 650 690
VOLTAGE - 460 585 605 670 720
SHIP WEIGHT (POUNDS)

15700 - 15 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
Figure 4. Scholar QV™ Heat Pump and Air Conditioner Models VAHA49/VACA60
Dimensional Data
BASIC MODEL4960 VOLTAGE - 230 935960
VOLTAGE - 460 960985
SHIP WEIGHT (POUNDS)

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 16
1.07 CONDENSATE DRAIN LINE (ROUGH-IN)
A. The condensate drain line can be roughed in to drain the Scholar QV™ heat pump or
air conditioner from either the back (outside) or the bottom (oor). The locations for
the condensate stub-outs can be determined from the cabinet knockouts identied
in Figures 3/4/5. The factory installed condensate connection within the cabinet is a
female PVC tting designed for a 3/4” slip connection.
CAUTION
INSPECT THE FLEXIBLE CONDENSATE DRAIN LINE INSIDE THE SCHOLAR QV™ UNIT
(WHEN INSTALLED) FOR POSSIBLE TUBING COLLAPSE. CORRECT AS APPROPRIATE.
TO PREVENT CONDENSATE FROM RUNNING DOWN THE INTERIOR OF THE WALL,
INSTALL FLASHING UNDER THE OUTDOOR AIR BOX OVER THE SILL OF THE WALL
OPENING. ROUTE THE CONDENSATE DRAIN AWAY FROM THE SCHOLAR QV™ UNIT
WITH SUFFICIENT DOWNWARD SLOPE TO INSURE ADEQUATE DRAINAGE.
1.08 WET HEAT (ROUGH-IN)
A. Hot water coil connections are made by dropping supply and return lines through
the knockout locations in the top of the plenums, as described in Figures 3/4/5 for the
heat pump. Access to the interior cabinet is through these factory-notched locations.
1.09 PREPARATION OF THE SCHOLAR QV™ HEAT PUMP AND AIR CONDITIONER
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.
After the rough-in is complete, the Scholar QV™ heat pump or air conditioner and
accessories must be prepared for nal installation prior to start-up. The following
items are to be completed prior to nal installation.
A. Remove the lower front panel of the Scholar QV™ heat pump or air conditioner for
access to the shipping skids. Unscrew the four hold-down lag bolts from the inside of
the unit.
Remove the shipping skids from under the Scholar QV™ heat pump or air
conditioner. The air box brace will come off with removal of the skids.
B. If the base stand accessory was chosen, install the base stand in accordance with
installation instructions included with the base stand or see Appendix B at end of
manual.
C. Hot Water Plenum. The protective lm on top of the Scholar QV™ cabinet and on the
plenum must be removed to install the plenum. Fasten the plenum to the top of the
cabinet in accordance with the instructions included with the plenum or Appendix C at
end of manual.

15700 - 17 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
D. Electric Heat. Remove the metal shipping plate from the electric heat assembly
mounted on top of the cabinet. Reference the tag afxed to the shipping plate on top
of the cabinet for directions, and shown in Figure 6.
Figure 6. Tag for Plate Removal Attached to Protective Plate on Electric Resistance
Heat Element at Top of the Scholar QV™ Cabinet.
ATTENTION: “INSTALLER”
REMOVE PROTECTIVE SHIPPING PLATE OVER ELECTRIC HEATER BEFORE
CONNECTING POWER TO UNIT. CHECK FOR DAMAGE.
E. Freeblow Plenum/Ducted Plenum. Install plenum to top of cabinet after shipping
plate has been removed from electric heater (if appropriate). Instructions are includ-
ed with plenum or see Appendix C at end of manual.
The air distribution system which is eld supplied and installed downstream of the
specied ducted plenum must be engineered to assure sufcient air ow, even
under adverse conditions, such as dirty lters. The information provided in Figure 1,
Appendix A should be used to design the air distribution system duct size leaving the
Scholar QV™ heat pump or air conditioner, keeping the external static pressure to a
minimum.
Applications using duct work should be designed and installed in accordance with the
current edition of the National Fire Protection Association codes and standards 90A
and 90B. The duct system must be engineered to insure sufcient air ow through
the unit to prevent over-heating of the heater element. This includes proper supply
duct sizing, sufcient quantity of supply registers, adequate return and lter 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. Ductwork
must be rmly attached, secured and sealed to prevent air leakage. Do not use duct
liner on inside of supply duct within four feet of the unit.
NOTE: Follow local codes and standards when designing duct runs to deliver the
required airow. Minimize noise and excessive pressure drops caused by duct aspect
ratio changes, bends, dampers and outlet grilles in duct runs.
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.
F. Install the outdoor louver/collar assembly to the outdoor side of the wall opening. The
louver/collar assembly may be fastened to the air box (or air box extension) as
described in the instructions for outdoor louvers/collars. The louver must be installed
with the blades pointing downward on the outside and the louver and the collar must
be water sealed to the outside wall surface with the appropriate caulking material.
See the instructions that come with the outdoor louver for installation details or see
Appendix F at the end of this manual.
G. Weather Panels are eld supplied and do not come with the Scholar QV™ heat pump
or air conditioner. If a weather panel covers the wall opening described in Figure 2,
remove the weather panel prior to installing the unit into the wall opening.

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 18
H. After measuring for correct locations of power/control wiring entry, condensate drain
line, and the appropriate wet heat lines, remove the appropriate knock-out access
ports from the cabinet. Be sure they align with the rough-in points for the noted pipes
and wires. Be sure electrical, condensate and wet heat piping will not cause inter-
ference or be damaged by sliding the Scholar QV heat pump or air conditioner into
place.
IMPORTANT
BE SURE TO SEAL THE OPEN AREAS BETWEEN LINES ENTERING THE SCHOLAR
QV™ CABINET AND THE KNOCKOUT OPENINGS, TO PREVENT AIR LEAKAGE.
I. If the heat pump or air conditioner is to t ush against the inside of the exterior wall,
cut to length, strips of open cell polyurethane foam 1” wide by 1/2” thick with adhe-
sive backing, eld supplied, on one side. This may be applied to the back of the heat
pump and plenum along and ush with the two vertical and top horizontal edges.
These strips will provide a nished appearance to the wall/heat pump interface and
provide a seal between the equipment and wall. If the heat pump or air conditioner is
applied with a side against a wall (in a corner), use the same strip material on the end
panel along the side vertical edge.
J. Prior to sliding the Scholar QV™ heat pump or air conditioner into the wall opening,
check to be sure that the oor surface is hard, smooth and level (concrete, wood,
vinyl tile or the equivalent). If the oor is carpeted, cut out an appropriate “footprint”
based on the Figure 3 or 4 or 5 drawings and the location of the unit relative to the in-
side nished wall (ush or offset). Be sure the surface is level or provisions are made
to level the unit upon installation.
K. On 4 and 5 ton units, the outdoor air box must be eld installed. Install the outdoor air
box onto the back of the 4 and 5 ton Scholar™ QV heat pumps or air conditioners be-
fore sliding the unit into position. Apply a weather-proof sealant; i.e., silicone, onto the
back of the Scholar QV heat pump or air conditioner prior to installing the outdoor air
box to prevent water leaks.
1.10 INSTALLATION THROUGH THE OUTSIDE WALL.
A. Slide the Scholar QV™ heat pump or air conditioner into the wall opening slowly, be-
ing careful to clear the appropriate stubouts. The heat pump or air conditioner, when
installed properly, should have a clearance between the air box outside edge and the
nished outside wall as shown in Figure 7. Proper t up of the louver/collar assembly
to the air box to the outside wall requires the noted recess dimension to be main-
tained after installing the unit.
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

15700 - 19 Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18
Figure 7. Dimension Between Scholar QV™ Heat Pump or Air Conditioner Air Box and
Finished Outside Wall for Outdoor Louver/Collar Assembly Installation
FREEBLOW PLENUM
SCHOLAR QV™
HEAT PUMP OR
A
IR CONDITIONER
DISTANCE (INCHES) BETWEEN AIR BOX
AND OUTSIDE FINISHED WALL
LOUVER/COLLAR
OUTSIDE WALL
NOTE: TO PREVENT CONDENSATE OR RAIN WATER FROM RUNNING
DOWN THE INTERIOR OF THE WALL, INSTALL FLASHING UNDER
THE OUTDOOR AIR BOX OVER THE SILL OF THE WALL OPENING.
CAUTION
WHEN FASTENING LOUVER/COLLAR ASSEMBLY TO AIR BOX, DO NOT
OVERTIGHTEN LOUVER SCREWS. OVERTIGHTENING SCREWS WILL CAUSE
DAMAGE AND WARP THE LOUVER/COLLAR ASSEMBLY.
C. Check (with a spirit level) to see that the heat pump or air conditioner is level and
plumb. If it is not, take the appropriate corrective action to level and plumb the system.
1/8” thick washers with 1/2” pass through holes can be installed appropriately under the
fastener holes in the base of the heat pump or air conditioner to make the system level
and plumb.
D. Secure the heat pump or air conditioner to the oor with appropriate eld supplied fas-
teners, through the four 1/2” diameter through holes in the base.
E If the Scholar QV™ heat pump or air conditioner is offset from the outside wall, trim
strips should be installed at this time. Check instructions that come with trim strips
for installation or see Appendix D at end of this manual.
F. If appropriate, install wall brackets to the inside surface of the outside wall and to the
cabinet of the Scholar QV™ unit, at this time. Check instructions with wall brackets
for installation or see Appendix E at end of this manual.
1.11 ELECTRICAL, CONDENSATE AND WET HEAT HOOK-UPS
WARNING
ALL ELECTRICAL, PLUMBING, HOT WATER FITTING AND REFRIGERATION
WORK MUST MEET THE REQUIREMENTS OF LOCAL AND NATIONAL CODES AND
ORDINANCES. WORK SHOULD BE DONE ONLY BY PROFESSIONALLY QUALIFIED
AND TRAINED SERVICE PEOPLE.

Marvair Scholar QV™ VACA/VAHA I&S Manual 03/2019 Rev.18 15700 - 20
IMPORTANT
STUBOUTS SHOULD BE LOCATED (FROM THE FLOOR OR WALL) TO BE DIRECTLY
OPPOSITE THE SELECTED CABINET KNOCKOUT ON THE CABINET, AS SHOWN IN
FIGURES 3/4/5. THIS IS A REQUIREMENT IF A BASE STAND IS TO BE INSTALLED
AND STUBOUTS ARE COMING THROUGH THE FLOOR.
A. 1. For line voltage wiring, the power supply must have the correct voltage, phase
and ampacity for the selected Scholar QV™ unit. Check the data label on each
Scholar QV unit to determine these values.
Be sure that the power to the line voltage wiring is off prior to hooking-up the wir-
ing within the Scholar QV™ cabinet. Remove the lower front panel for access to
the disconnect. Figure 8 illustrates the disconnect location with the lower front
panel removed. Turn the disconnect to “OFF” position.
Remove the middle front panel for access to the control center. The electrical
schematic for the heat pump or air conditioner is contained in a pocket on the
inside of the middle front panel door. Figures 9 and 10 show typical control cen-
ters for the Scholar QV heat pump and air conditioner. Figures 11 and 12 show
typical single and three phase wiring diagrams for the Scholar QV heat pump and
air conditioner.
2. Power supply service must be with the allowable voltage range stamped on the
identication plate. To operate a nominal 230/208V model on 208V, change
the transformer line tap from 240V to 208V, following the instructions on
the electrical schematic.
3. Connect the main power wires coming into the cabinet to the input side of the
disconnect. (L1 and L2 for single phase units and L1, L2 and L3 for three phase
models.) Install the ground wire on the ground lug.
CAUTION
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.
However, three phase compressors will rotate in either direction depending upon
phasing of power. Since there is a 50-50 chance of connecting power in such a
way as to cause rotation in the reverse direction, it is imperative to conrm that
the compressor is rotating in the proper direction at the initial eld start-up of the
system. Verication of proper rotation is made by observing that the suction pres-
sure drops and the discharge pressure rises when the compressor is energized.
An alternate method of verication for self contained system with small critical
refrigerant charges, where the installation of gauges may be objectionable, can