Airxcel Marvair Scholar V Installation and operation manual

MODEL NUMBER: _________________________
SERIAL NUMBER: _________________________
DATE OF START-UP: _______________________
Manufactured By:
Marvair®Division of AIRXCEL™, Inc.
P.O. Box 400 • Cordele, Georgia 31010
156 Seedling Drive • Cordele, Georgia 31015
[phone] • Fax [phone]
E-mail: [e-mail] • Internet: www.marvair.com
The most current version of this manual can be found at www.marvair.com.
INSTALLATION & STARTUP MANUAL
Scholar V Classroom Units: 2 to 5 Ton Cooling Capacity
Models VAIVA36 (14-42 BTUH) VIAVA60 (24-60 BTUH)
with Variable Refrigerant Flow Compressors
Scholar V with Free Blow Plenum
WARNING - SAFETY REQUIREMENTS
• If the information in these instructions is 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.
Marvair Scholar V Installation & Startup Manual 07/2016 New
Part #03079

Scholar V Installation & Startup Manual 07/2016 New 2
How To Use This Manual
This manual is intended to be a guide to the Marvair®Scholar V line of vertical packaged heat pumps and air
conditioners. This manual covers the installation and start-up of the Scholar V heat pumps and air conditioners,
models VAIVA, with two stage compressors. 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 V 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 and outdoor louvers.
If a malfunction occurs, follow this troubleshooting sequence:
1. Make sure you understand how the Scholar V 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, result-
ing in DAMAGE upon START-UP.
3. TURN ELECTRICAL POWER OFF AT THE breaker or fuse box BEFORE installing or working on the equip-
ment. LINE VOLTAGES ARE HAZARDOUS or LETHAL.
4. OBSERVE and COMPLY withALLapplicable 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 manu-
als 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 suggestions that will result in improved installation, reliability or
operation.
Specications subject to change without notice.
© 7/2016 Marvair®, Division of AIRXCEL™, Inc.

3Scholar V Installation & Startup Manual 07/2016 New
HEATING, VENTILATING AND AIR CONDITIONING EQUIPMENT
INSTALLATION AND START-UP INSTRUCTIONS
FOR SCHOLAR V HEAT PUMP AND AIR CONDITIONER MODEL VAIVA
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 Thermostat.....................................................................................8
1.05 Optional Controls .........................................................................13
1.06 Location Selection and Preparation .............................................13
1.07 Power and Control Wiring (Rough-In)..........................................14
1.08 Condensate Drain Line (Rough-In) ..............................................16
1.09 Preparation of the Scholar V Units...............................................16
1.10 Installation Through the Outside Wall ..........................................18
1.11 Electric, Condensate and Heat Hook-Ups ...................................19
1.12 Ventilation System Calibration .....................................................24
1.13 Programmable Logic Controller (PLC).........................................26
1.14 Remote Temperature/RH Transmitter Installation ........................30
1.15 Start-up Procedure.......................................................................31
Appendix A Ratings and Data .........................................................................35
Appendix B Base Stand Installation ................................................................36
Appendix C Free Blow/Plenum Installation......................................................39
Appendix D Trim Strip Installation ...................................................................42
Appendix E Wall Bracket Installation...............................................................44
Appendix F Outdoor Louver/Collar Installation................................................46
Appendix G Electric Heater Installation ...........................................................49

Scholar V Installation & Startup Manual 07/2016 New 4
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
• 5/16 hex bit
• 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 (Steam or Hot Water) (if appropriate)
• 25 Ft. of Polyurethane Foam Strips, 1” Wide x 1/2” Thick, Adhesive Backing, for
Scholar III/Wall Interface.
1.02 INSPECTION/UNPACKING/HANDLING
A. The Scholar V 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.
B. Immediately upon delivery to the jobsite, each Scholar V 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
carrier within 15 days, on the freight carrier’s form.
The Scholar V 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.

5Scholar V Installation & Startup Manual 07/2016 New
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.
WARNING
THE SCHOLAR V UNIT WEIGHS IN EXCESS OF 1,000 LBS. WHEN MOVING THE
UNIT, SUFFICIENT MANPOWER AND MECHANICAL EQUIPMENT MUST BE USED
TO PREVENT DAMAGE TO THE UNIT AND INJURY TO PEOPLE. TO FACILITATE
MOVING THE SCHOLAR V UNIT, IT MAY BE NECESSARY TO LAY THE UNIT ON ITS
SIDE ON DOLLIES. IF THIS IS REQUIRED, USE TWO DOLLIES AND PLACE THE UNIT
ON ITS RIGHT SIDE (WHEN FACING THE SCHOLAR V UNIT). THE UNIT SHOULD
NOT REMAIN IN THIS POSITION ANY LONGER THAN REQUIRED FOR THE ACTUAL
MOVING PROCESS. IF THE SCHOLAR V UNIT HAS BEEN PLACED ON ITS SIDE, DO
NOT ATTEMPT TO START THE UNIT UNTIL THE UNIT HAS BEEN UPRIGHT FOR AT
LEAST 24 HOURS.
C. Note the unit identication label is located on the right side cabinet panel at the lower
front corner. The identication label has the model and serial number 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

Scholar V Installation & Startup Manual 07/2016 New 6
For the Scholar V heat pump or air conditioner system, the identication numbering
system is shown below. The model identication number is located as shown below in
Figure 1.
Source
Vertical
Air
Indoor
Nominal Cooling
System Type
HP = Heat Pump
AC = Air Conditioner
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
•••• •
VAI•V
Configuration
V = Scholar V
Variable Speed
Compressor
V
Refrigerant
R-410A
A
24 = 24,000 BTUH
36 = 34,000 BTUH
48 = 46,000 BTUH
60 = 54,500 BTUH
Heat – kW
000 - No Heat
050 = 5 kW
075 = 7.5 kW
100 = 10 kW
150 = 15 kW
099 = 99 (Hot Water)
Q=GreenCube™ ERV
MODEL IDENTIFICATION
LABEL LOCATION REAR CONDENSATE ACCESS
RETURN AIR
OUTDOOR
AIR BOX
INTAKE &
EXHAUST OF
CONDENSER
AIR & FRESH
AIR
Figure 1. General External Component Identication and Access to Scholar V Heat Pump
or Air Conditioner

7Scholar V Installation & Startup Manual 07/2016 New
1.03 STANDARD CONTROLS
A. 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 V 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 V
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 V 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.
B. Heat Related Controls
The outdoor thermostat (heat pump only), factory set at 40°F, determines the
temperature at which the supplemental electric heat (or wet heat) turns on to heat
the classroom. The temperature set point can be adjusted in the eld for local
conditions. When the outdoor thermostat activates electric heat, the compressor
simultaneously turns off.
The electric heat control (heat pump only) operates only when a preset outdoor
temperature is reached. Electric heat can also operate upon request from the control
setting for emergency heat.
The electric heat during defrost (heat pump only) is programmed to operate
during defrost.
C. The motorized fresh air damper with PowerVent and GreenWheel®ERV
ventilation 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,
automatically balancing the intake and exhaust cfm up to 450 cfm. An optional fan
speed control allows independent operation of the intake and exhaust air blowers.
IMPORTANT
MINIMUM AIR FLOW IS REQUIRED FOR PROPER OPERATION.

Scholar V Installation & Startup Manual 07/2016 New 8
1.04 THERMOSTAT
The Scholar V does not use a conventional wall mounted thermostat and sub base.
Instead, an internal Temperature and Relative Humidity sensor sends room condition
information directly to the PLC in the unit for processing.
Figure 2. Internal Temperature/Humidity Sensor
Temperature and Relative Humidity set-point adjustments are made on the HMI
(Human-Machine-Interface) screen typically located on the front of the unit. The HMI
contains several screens with parameters that can be changed by the end user. There
are other parameters designed for use by qualied service personnel and these are
accessible with a User Name and Password only.
Figure 3. HMI Touchscreen Controller
The HMI uses touch Screen Technology. All screen manipulation and set-point changes
can be made just by touching the appropriate virtual buttons on the screen.

9Scholar V Installation & Startup Manual 07/2016 New
A. Main Screen
The rst screen is the main screen and contains the following:
Room Temperature Read-out
Displays real time room temperature
Room Relative Humidity Read-out
Displays real time room relative humidity
Fault Reset
Press this button once to clear any faults that may have occurred
Set-Points
Press this button to go to another screen with the set points
Cooling
Press this button once to enter the cooling mode. The chosen operating mode is
shown at the bottom of the screen.
Heating
Press this button once to enter the heating mode. The chosen operating mode is
shown at the bottom of the screen.
AutoCool/Heat
This mode will allow automatic change-over from Cooling to Heating and vice-versa.
When this mode is being used, the cooling set point is established by the end user
and the heating set-point is calculated by applying a differential to the cooling set
point. In this mode, the heating set-point will always be less than the cooling set/
point.
Emergency Heat
In this mode, all compressor functions are disabled and heating is provided with
electric resistance heating elements.

Scholar V Installation & Startup Manual 07/2016 New 10
Operating Mode Read-Out
This box shows the mode that the unit is running in.
Forward
Advances to the next screen
Blower Auto
Press this to run the indoor blower only when a cooling or heating function is
required. The selection you make is shown in the box below.
Blower ON
Press this to run the indoor blower continually. The selection you make is shown in
the box below.
Blower On/Auto Read-Out
This box shows which blower operation technique is being used.
B. Temperature Screen
The next screen is the Temperature screen and shows several important
temperature values, as well as the compressor and blower control voltages
Supply Air
This is the real-time temperature of the air coming out of the unit.
Outside Air
This is the real-time temperature of the ambient outside air.
Outside Coil #1
This is the temperature read by a thermocouple buried in the feeder tubes of Outside
Coil #1.
Outside Coil #2
This is the temperature read by a thermocouple buried in the feeder tubes of Outside
Coil #2.

11 Scholar V Installation & Startup Manual 07/2016 New
Room Temperature
This is the real-time temperature being transmitted by the temperature transmitter
located in the inlet to the evaporator coil.
Room RH
This is the real time relative humidity being transmitted by the RH transmitter located
in the inlet to the evaporator coil.
Forward
Press this button to go forward one screen.
Back
Press this button to go back one screen.
Back to Main
Press this button to go back to the main screen.
Compressor Volts
This box shows the speed control voltage being sent to the compressor.
Blower Volts
This box shows the speed control voltage being sent to the indoor blower.
C. Set-Points Screen
The Set-Points Screen is where the desired room conditions are set.
Cooling Set-Point
In the Cooling Mode or Auto Cool/Heat Mode, this is the user adjustable temperature
the unit runs to try and achieve while cooling the space.
Heating Set-Point (manual)
In the Heating Mode (manual, not Auto Cool/Heat), this is the user adjustable
temperature the unit runs to try to achieve while heating the space.

Scholar V Installation & Startup Manual 07/2016 New 12
Heating Set-Point (auto)
This set point is automatically calculated and is not directly adjustable by the end
user. Adjustment is made by changing the Auto Cool/Heat Differential (see below).
Humidity Set-Point
This is the user adjustable relative humidity the unit runs to try to achieve in the
Cooling Mode or in the Dehumidication with Reheat mode. The Dehumidication
with Reheat mode will automatically come on if the temperature is satised in cooling
but the relative humidity is still high. Cooling is forced on for dehumidication with
hot gas reheat to keep from overcooling the space.
Auto Cool/Heat Differential
This number is subtracted from the Cooling Set Point to establish the Heating Set
Point while the unit is in the Auto Cool/Heat Mode.
Low Ambient Override
This is the outside temperature at which heat pump heating operation is
discontinued and resistance heating is used. It is Password Protected
D. Other Screens
There are several other screens used for diagnostics. The screens are shown below
but detailed discussion is not provided in this document.

13 Scholar V Installation & Startup Manual 07/2016 New
1.05 OPTIONAL CONTROLS
A. All units have the following control options available.
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.
1.06 LOCATION SELECTION AND PREPARATION
WARNING
THE SCHOLAR V HEAT PUMP AND AIR CONDITIONER MUST BE INSTALLED IN
CONFORMANCE WITH ALL APPLICABLE LOCAL AND NATIONAL ELECTRICAL,
PLUMBING AND BUILDING CODES.
A. The Scholar V 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 V
heat pump or air conditioner where noxious fumes or gas can be drawn in from the
outdoor air and introduced in the classroom.
The Scholar V 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. Do not locate either side of the Scholar within 12” from a wall. The front
doors swing open to allow access to all components. Do not put anything immovable
in front of the Scholar V unit.
To remove carpet from where the “footprint” of the unit will be when installed,
carefully measure, cut and remove carpet from an area based on the dimensions
of the Scholar V cabinet as described in Figure 5; and allowing for any offset or
standoff from the nished interior surface of the wall.
Prior to installation of the Scholar V heat pump or air conditioner, provisions are to
be made for the following, as appropriate.

Scholar V Installation & Startup Manual 07/2016 New 14
B. Wall opening dimensions for the Scholar V 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.
DIMENSION
A 45-1/8”
B 56”
C 32”
C* 34”
*When 2” high base stand is used, the C* dimension
is specied. The use of a base stand with a height
other than 2” will change the C height accordingly.
Dimensions are in inches.
Figure 4. Wall Opening Dimensions for Scholar V Heat Pump and Air Conditioner.
1.07 POWER AND CONTROL WIRING (ROUGH-IN)
A. Line voltage power supply must be sized to provide adequate power for the
operation of the specic model heat pump and, if chosen, the electric heat option.
Information 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 Figure 5. Depending on the location of the Scholar V 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 cabinet for routing and connecting the power lines, after the Scholar V 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.

15 Scholar V Installation & Startup Manual 07/2016 New
44-1/8
28-7/8
9-1/8 30 9-1/8
13
13-3/8
10
6-7/8
1-3/8
23
Supply Air
TOP VIEW
R23-1/2
1
Front Door
Access Opening
Electrical 3/4 x 1 KOs
20-1/4
11-7/8
19-1/4
Condensate 3/4 x 1 KO 19-1/4
21-1/8
SECTION A-A
Weep Holes
Optional 3/4” Drain (Weep Holes Removed)
A
12-1/8
9-3/4
Electrical 3/4 x 1 KOs
Access Opening
Condensate 3/4 x 1 KO
A
11-7/8
14 10-7/8
REAR VIEW
LH SIDE VIEW
2-5/8
33
54-1/8
2-3/8
19-3/4
11-3/4 16
7/8
74-3/8
94-1/8
2
Return Air (both sides)
Optional
3/4” Drain
GreenWheel®ERV
B-Damper Exhaust Air (LH Side only)
7
5-1/8
30-1/8
22-1/8 2-7/8
4-1/2
15-1/4
5/8
48-1/8
12-1/2
1-5/8
FRONT VIEW
BASIC MODEL 24 30 6404860 VOLTAGE - 230 1020 1020 1020 1030 1045 1060
VOLTAGE - 460 1045 1045 1045 1055 1070 1085
SHIP WEIGHT (POUNDS)
Figure 5. Scholar V Heat Pump and Air Conditioner Dimensional Data

Scholar V Installation & Startup Manual 07/2016 New 16
1.08 CONDENSATE DRAIN LINE (ROUGH-IN)
A. The condensate drain line can be roughed in to drain the Scholar V 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
Figure 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 V UNIT
(WHEN INSTALLED) FOR POSSIBLE TUBING COLLAPSE. CORRECT AS APPROPRIATE.
1.09 PREPARATION OF THE SCHOLAR V 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 V 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 two shipping screws that are at the top and bottom of the front door.
B. Open the front door for access to the lag bolts that hold the shipping skids in place.
Unscrew the 4 lag screws. Note: access to the back right lag screw is easier through
the condensate opening in the back panel beneath the outdoor air box. Remove the
shipping skids.
C. To facilitate moving the Scholar through doors, the out door air box can be removed.
To remove the outdoor air box, remove the 16 screws - 6 on each side and 4 along
the top. Remember to reinstall the outdoor air box before placing the Scholar into its
nal position in the classroom.
D. 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.
E. Freeblow Plenum/Ducted Plenum. All Scholar V heat pump and air conditioners use
an electronically commutated (EC) blower motor to distribute the conditioned air
throughout the classroom. Taking commands from the PLC controller, the EC motor
automatically adjusts its speed to match the compressor speed. No eld adjustment
of the blower is required. Install plenum to top of cabinet after shipping plate has
been removed from electric heater (if appropriate). Instructions are included with
plenum or see Appendix C at end of manual.
F. 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 V heat pump or air conditioner, keeping the external static pressure to a
minimum.

17 Scholar V Installation & Startup Manual 07/2016 New
G.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.
H. 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.
I. 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.
J. Weather Panels are eld supplied and do not come with the Scholar V heat pump
or air conditioner. If a weather panel covers the wall opening described in Figure 4,
remove the weather panel prior to installing the unit into the wall opening.
K. 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
interference or be damaged by sliding the Scholar V heat pump or air conditioner
into place.
IMPORTANT
BE SURE TO SEAL THE OPEN AREAS BETWEEN LINES ENTERING THE SCHOLAR V
CABINET AND THE KNOCKOUT OPENINGS, TO PREVENT AIR LEAKAGE.
L. 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
adhesive backing, eld supplied, on one side. his 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.
M.Prior to sliding the Scholar V 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 5 drawings and the location of the unit relative to the inside
nished wall (ush or offset). Be sure the surface is level or provisions are made to
level the unit upon installation.

Scholar V Installation & Startup Manual 07/2016 New 18
N. If the outdoor air box was removed, reinstall it prior before placing the Scholar V unit
in its nal position. Install the outdoor air box onto the back of the Scholar V heat
pumps or air conditioners before sliding the unit into position. Apply a weather-proof
sealant; i.e., silicone, onto the back of the Scholar V 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 V heat pump or air conditioner into the wall opening slowly, being
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 6. Proper t up of the louver/collar
assembly to the air box to the outside wall requires the noted recess dimension to be
maintained 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
FREEBLOW PLENUM
SCHOLAR V™
HEAT PUMP OR
A
IR CONDITIONER
DISTANCE (INCHES) BETWEEN AIR BOX
AND OUTSIDE FINISHED WALL
LOUVER/COLLAR
OUTSIDE WALL
NOTE: TO PREVENT RAIN WATER FROM RUNNING
DOWN THE INTERIOR OF THE WALL, INSTALL FLASHING UNDER
THE OUTDOOR AIR BOX OVER THE SILL OF THE WALL OPENING.
Figure 6. Dimension Between Scholar V Heat Pump or Air Conditioner Air Box and
Finished Outside Wall for Outdoor Louver/Collar Assembly Installation

19 Scholar V Installation & Startup Manual 07/2016 New
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. TO PREVENT WATER FROM
RUNNING DOWN THE INTERIOR OF THE WALL, INSTALL FLASHING UNDER THE
OUTDOOR AIR BOX, OVER THE SILL OF THE WALL.
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
fasteners, through the four 1/2” diameter through holes in the base.
E. If the Scholar V 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 V 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 HEAT HOOK-UPS
WARNING
ALL ELECTRICAL, PLUMBING, 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.
IMPORTANT
STUBOUTS SHOULD BE LOCATED (FROM THE FLOOR OR WALL) TO BE DIRECTLY
OPPOSITE THE SELECTED CABINET KNOCKOUT ON THE CABINET, AS SHOWN IN
FIGURE 3. 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 V unit. Check the data label on each
Scholar V unit to determine these values.
Be sure that the power to the line voltage wiring is off prior to hooking-up the
wiring within the Scholar V cabinet. Remove the lower front panel for access to
the disconnect. Figure 7 illustrates the disconnect location with the lower front
panel removed. Turn the disconnect to “OFF” position.
The electrical control compartment is located behind the front door at the lower
right hand corner of the unit. The electrical schematic for the heat pump or air
conditioner is contained in a pocket on the inside of the middle front panel door.
Figure 7 shows typical control centers for the Scholar V heat pump and air

Scholar V Installation & Startup Manual 07/2016 New 20
conditioner. Figures 8 and 9 show typical single and three phase wiring diagrams
for the Scholar V 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 terminal block
located next to the disconnect. 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.
VENTILATION
FILTERS
HIGH VOLTAGE
ELECTRICAL
CONTROL BOX
LOW VOLTAGE
ELECTRICAL
CONTROL BOX
UNIT DISCONNECTPLC
Figure 7. Electrical Control Box, Access to Ventilation Filters and GreenWheel® ERV
Note: Due to the variety of options, the control box in your unit may differ from the
photo. Always refer to the electrical schematic in your unit.