Bard Q36A4DA User manual

Page 1 of 49
11EER Q-TECTM Q**A4D Series
Packaged Air Conditioner
Models:
INSTALLATION INSTRUCTIONS
Q36A4DA
Q36A4DB
Q36A4DC
Q42A4DA
Q42A4DB
Q42A4DC
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual: 2100-752B
Supersedes: 2100-752A
Date: 5-14-21
Q48A4DA
Q48A4DB
Q48A4DC

Manual 2100-752B
Page 2 of 49
CONTENTS
Getting Other Information and Publications .........3
Q-TECTM General Information.....................................4
Q-TEC Model Nomenclature ...................................4
Shipping Damage..................................................4
Unit Removal from Skid.........................................4
Handling Unit after Removal from Skid ...................6
General ................................................................6
Minimum Installation Height..................................7
Duct Work ............................................................8
Filters ..................................................................8
Switching Filter Sizes .....................................9
Fresh Air Intake...........................................................9
Vent Options ..............................................................9
Barometric Fresh Air Damper (Standard) .................9
Commercial Room Ventilator (Option)....................10
Q-TEC Energy Recovery Ventilator (Option) ............10
Installation ..................................................................11
Basic Installation Design and Application Planning .. 11
Mounting the Unit...............................................11
Condensate Drain................................................13
Optional Rear Drain Kits................................14
Indoor Ducted and Non-Ducted Applications..........18
Indoor Supply Airow....................................18
Indoor Return Airow ....................................18
Ducted Applications......................................18
Free Blow Applications..................................18
Thermostat or Indoor Temperature Sensor
Placement ...................................................18
Wiring – Main Power............................................20
High Voltage Connections ..............................20
Wiring – Low Voltage ...........................................21
Low Voltage Connections ...............................21
Unit Shutdown Feature .................................21
Balanced ClimateTM Feature...........................21
Dehumidication Feature ..............................21
Ventilation Features ......................................21
Low Ambient Control.....................................21
Freeze Protection Thermostat ..................22
Start Up ........................................................................25
General ............................................................25
Topping Off System Charge ..................................25
Safety Practices ..................................................25
Vent Connection Plug ..........................................25
Pressure Service Ports .........................................25
Important Installer Notes .....................................26
Dehumidication Models...............................26
Service Hints ......................................................26
High and Low Pressure Switches ..........................26
Pressure Switch Lockout ...............................26
Three Phase Scroll Compressor Start Up
Information ........................................................26
Compressor Control Module..................................26
Over and Under Voltage Protection .................27
Intelligent Reset...........................................27
Alarm Output ...............................................27
High Pressure Switch and Lockout Sequence ..27
Troubleshooting Compressor Logic CCM ..........27
High Pressure Switch .............................27
Low Pressure Switch ..............................27
Freeze Stat Switch .................................27
Logic Control Board................................28
Phase Monitor ....................................................28
Condenser Fan Operation.....................................28
Sequence of Operation ........................................28
Balanced ClimateTM Mode..............................29
Service .........................................................................30
T roubleshooting ECM 142R Outdoor Fan Motors....... 30
Replacing the Motor .....................................31
Troubleshooting ECM Indoor Blower Motors ...........32
Replacing ECM Control Module......................33
Fan Blade Setting Dimensions..............................35
R-410A Refrigerant Charge ..................................35
Removal of Fan Shroud........................................35
Dehumidification Unit Instructions .......................41
Dehumidication Circuit ......................................41
Dehumidication Sequence of Operation ...............41
Balanced Climate Mode .......................................41
Electronic Expansion Valve...................................41
Operation.....................................................41
EEV Instructions for Vacuuming,
Reclaiming and Charging Unit .......................41
Troubleshooting the Electronic Expansion
Valve ...........................................................42
Control Board ........................................43
Electronic Expansion Valve......................43
Relay in EEV Control Box ........................43
Stator Coil.............................................43
Transducer Sensor..................................43
Thermistor Sensor..................................44
Air Conditioning Mode Circuit Diagram..................45
Dehumidification Mode Circuit Diagram ................45
Q36A4D Cooling and Dehumidification
Application Data .................................................46
Q42A4D Cooling and Dehumidification
Application Data .................................................47
Q48A4D Cooling and Dehumidification
Application Data .................................................48
TABLES
Table 1 Wall Thermostats ...................................22
Table 2 Humidity Controls ..................................22
Table 3 CO2Controllers ......................................22
Table 4 Thermostat Wire Size..............................22
Table 5 Troubleshooting ECM 142R Outdoor
Fan Motors ............................................31
Table 6 Troubleshooting ECM Blower Motors ........34
Table 7 Fan Blade Dimensions............................35
Table 8A Cooling Pressure – Standard Airow.........36
Table 8B Cooling Pressure – Balanced Climate
Airow ..................................................36
Table 9 Electrical Specications Q**A4D Series .... 37
Table 10 Indoor Blower Performance .....................38
Table 11 Maximum ESP Electric Heat Only............38
Table 12 Electric Heat .........................................38
Table 13 Electronic Expansion Valve
Troubleshooting .....................................42

Manual 2100-752B
Page 3 of 49
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help when installing the air
conditioner. They can usually be found at the local
library or purchased directly from the publisher. Be
sure to consult the current edition of each standard.
National Electrical Code ......................ANSI/NFPA 70
Standard for the Installation of Air Conditioning and
Ventilating Systems
.......................................................ANSI/NFPA 90A
Standard for Warm Air Heating and Air Conditioning
Systems
.......................................................ANSI/NFPA 90B
Load Calculation for Winter and Summer Air
Conditioning
....................................... ACCA Manual J Residential
Duct Design for Residential Winter and Summer Air
Conditioning and Equipment Selection
....................................................... ACCA Manual D
For more information, contact these publishers:
ACCA Air Conditioning Contractors of America
1712 New Hampshire Ave. N.W.
Washington, DC 20009
Telephone: [phone]
Fax: [phone]
ANSI American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]
ASHRAE American Society of Heating, Refrigeration
and Air Conditioning Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]
NFPA National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]
Table 14 10K OHM NTC Sensor: Temperature/
Resistance ............................................44
Table 15 Dehumidication Relay Logic Board.........49
FIGURES
Figure 1 Air Seal Under Q-TEC Unit........................5
Figure 2 Removal of Q-TEC Unit from Skid..............5
Figure 3 Fan Assembly Removal.............................6
Figure 4 Q-TEC Unit on Appliance Cart ...................6
Figure 5 Installation with Duct-Free Plenum............7
Figure 6 Ducted Application ..................................7
Figure 7 Supply Duct Connections..........................8
Figure 8 Filter Location .........................................8
Figure 9 Filter Tabs in Up Position..........................9
Figure 10 Bend FIlter Tabs Down .............................9
Figure 11 Fresh Air Damper Assembly ......................9
Figure 12 Remove Compressor Shipping Brackets....11
Figure 13A Unit Mounting – Method 1......................12
Figure 13B Unit Mounting – Method 2......................12
Figure 14 Remove Locking Screws from Wheels.......13
Figure 15 Optional Side Drain (Side View)...............13
Figure 16 Standard Rear Drain...............................13
Figure 17 Rear Drain (Top View) .............................14
Figure 18A ............................................................15
Figure 18B ............................................................15
Figure 18C ............................................................16
Figure 18D ............................................................17
Figure 19 Unit Dimensions ....................................19
Figure 20 High Voltage Connections .......................20
Figure 21 Thermostat Connections .........................23
Figure 22 Thermostat Connections .........................24
Figure 23 Compressor Logic Control Board ..............27
Figure 24 CCM LED Fault Illumination .................... 28
Figure 25 Control Disassembly ...............................33
Figure 26 Winding Test..........................................33
Figure 27 Drip Loop ..............................................33
Figure 28 Control Connector Motor Half ..................34
Figure 29 Fan Blade Setting ..................................35
FIgure 30 Fan Shroud Removal ..............................35
Figure 31 Electronic Expansion Valve (EEV) and
Service Tool...........................................42
Figure 32 High Side Connection.............................42
Figure 33 Voltage to Pressure: Suction Pressure
Transducer ............................................43
GRAPHS
Graph 1 Q36A4D FAD Ventilation Delivery ........ 39
Graph 2 Q42A4D FAD Ventilation Delivery ........ 39
Graph 3 Q48A4D FAD Ventilation Delivery ........ 40

Manual 2100-752B
Page 4 of 49
Q-TEC GENERAL INFORMATION
Q-TEC Model Nomenclature
Shipping Damage
Upon receipt of equipment, the carton should be
checked for external signs of shipping damage. The
skid must remain attached to the unit until the unit is
ready for installation. If damage is found, the receiving
party must contact the last carrier immediately,
preferably in writing, requesting inspection by the
carrier’s agent.
Unit Removal from Skid
It is not recommended that the unit be removed from
the skid with a fork lift as the air seal under the unit
could be damaged (see Figure 1).
The shipping brackets on each side of the unit must be
removed and discarded (see Figure 2). The return air
grille panel can be removed to provide a place to hold
the unit.
The unit can be tipped forward and slid down the edge
of the skid until the front wheels touch the ground. The
wheels will not roll as they are shipped from the factory
locked. The back of the skid will have to be held down
to keep it from tipping up. The skid can be slid out
from under the unit. The unit can then be set upright.
!WARNING
Heavy item hazard.
Use more than one person to handle unit.
Check unit wheels to ensure that wheels are
locked before removing from skid.
Failure to do so could result in unit damage
or serious injury.
ACCESSORIES AND CONTROL
OPTIONS
X – Standard Controls
E – Standard Controls, Low
Ambient Control (LAC)
COIL OPTIONS
X – Standard
1 – Phenolic Coated Evaporator
2 – Phenolic Coated Condenser
3 – Phenolic Coated Evaporator
and Condenser
Q 36 A 4 D A 0Z X P X X X X
MODEL SERIES
FILTER OPTIONS
X – 1" MERV 2 Disposable Filter
M – 2" MERV 11 Disposable Filter
N – 2" MERV 13 Disposable Filter
P – 2" MERV 8 Disposable Filter
B – NPBI TECH + 2" MERV 13 Disposable Filter
A – UV-C + 2" MERV 13 Disposable Filter
PLACEHOLDER
X – Standard Unit
Q – QSP Plenum Option
COLOR OPTIONS
X – Beige Baked Enamel Finish
V – Vinyl Coated
4 – Buckeye Gray Baked Enamel Finish
CAPACITY
36 – 3 Ton
42 – 3½ Ton
48 – 4 Ton
SPECIALTY PRODUCTS
D– Hot Gas Reheat Dehumidication
REVISION
A – Air Conditioner
VENTILATION OPTIONS
X – Fresh Air Damper
B – Blank-off Plate
R – Energy Recovery Ventilator
S – Partial Flow Economizer, JADE
V – Commercial Ventilator, Modulating
VOLTS & PHASE
A – 230/208/60/1
B – 230/208/60/3
C – 460/60/3
ELECTRIC HEAT
00 – 0kW with Lug Connection
0Z – 0kW with Circuit Breaker
05 – 15kW with Circuit Breaker
See Electrical Specifications for further details.

Manual 2100-752B
Page 5 of 49
FIGURE 1
Air Seal Under Q-TEC Unit
Hold Skid
Down
AShipping Brackets BFront Wheels Over Edge CFront Wheels On Floor
FIGURE 2
Removal of Q-TEC Unit from Skid
Air Seal
MIS-1008
MIS-1007

Manual 2100-752B
Page 6 of 49
Handling Unit after Removal from Skid
!CAUTION
Be careful pushing unit on rollers to prevent
the unit from tipping over.
Failure to do so could result in personal
injury.
The unit will have to be turned sideways and removed
from skid to t through a doorway. If the door height
allows, the unit can be slid sideways through the door.
The fan assembly can be easily removed to reduce
depth to 34” for tting through 36” doorway (see
Figure 3).
FIGURE 3
Fan Assembly Removal
If the unit cannot be slid through the doorway, then the
unit will have to be put on a appliance cart and tipped
down to roll through the doorway. It is recommended
that a strap be used hold the unit down on the cart. The
wheels of the unit must be locked. If the wheels were
allowed to roll, the unit could roll off the cart. The unit
should always be carted from the right side which is the
side where the compressor is located (see Figure 4).
The blade of the appliance cart should be slid under
the wheels of the unit. The strap of the appliance cart
should be placed around the unit and strapped tight.
Help will be required to tip the unit back on to the cart.
The unit can be leaned far enough back to be rolled
through the doorway. Be careful when setting the unit
back up to keep from damaging the unit.
General
The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians.
A Q-TEC Series wall sleeve offered as a separate
accessory must be ordered and installed with Q-TEC unit.
The unit is designed for use with or without duct work.
For use without duct work, Plenum Box QPB36 is
recommended.
These instructions explain the recommended method
to install the air cooled self-contained unit and the
electrical wiring connections to the unit.
These instructions and any instructions packaged with
any separate equipment required to make up the entire
air conditioning system should be carefully read before
beginning the installation. Note particularly “Start
Procedure” and any tags and/or labels attached to the
equipment.
While these instructions are intended as a general
recommended guide, they do not supersede any
national and/or local codes in any way. Authorities
having jurisdiction should be consulted before the
installation is made. See page 3 for information on
codes and standards.
Size of unit for a proposed installation should be based
on heat loss calculation made according to methods of Air
Conditioning Contractors of America (ACCA). The air duct
should be installed in accordance with the Standards
of the National Fire Protection Systems of Other Than
Residence Type, NFPA No. 90A, and Residence Type
Warm Air Heating and Air Conditioning Systems, NFPA
No. 90B. Where local regulations are at a variance with
instructions, installer should adhere to local codes.
MIS-4173
STRAP
APPLIANCE CART
COMPRESSOR
Q/TEC UNIT
FIGURE 4
Q-TEC Unit on Appliance Cart
MIS-4215
Fan assembly (slide up to
remove).
MIS-4215
COND. COIL COVER
HAS TO BE REMOVED TO
FAN ASSEMBLY
SLIDE OUT FAN ASSEMBLY
(SLIDE UP TO REMOVE)
BEFO
RE REMOVING, UNPLUG
FAN
MOTOR WIRE FROM
FAN
MOTOR CONTROL
Before removing, unplug fan motor
wire from fan motor control.
Condenser coil cover has to
be removed to slide out fan
assembly. Re-install coil cover
prior to rolling through doorway.
This is done to protect the coil
ns from damage.
MIS-4173

Manual 2100-752B
Page 7 of 49
Minimum Installation Height
The minimum installation height of the unit with a free
blow plenum is 8' 6". This provides enough clearance
for the plenum to be removed (see Figure 5).
The minimum installation height for ducted
applications is 8' 4-1/2". This provides enough
clearance to install the duct work (see Figure 6).
FIGURE 5
Installation with Duct-Free Plenum
8 FT. - 5 IN. 8 FT. - 6 IN.
MINIMUM REQUIRED
INSTALLATION HEIGHT
MIS-4174
FLOOR MIS-4174
FIGURE 6
Ducted Application
7 FT. - 4 IN.
UNIT HEIGHT
8 FT. - 7 IN.
MINIMUM RECOMENDED
CEILING HEIGHT
MIS-4175
12 IN.
MINIMUM
BOTTOM
TO DUCT
2IN. MINIMUM
FROM DUCT
FLANGE
8 FT. - 4.5 IN.
MINIMUM REQUIRED
INSTALLATION HEIGHT
DUCT FLANGE
DUCT
FLOOR
20 IN.
MINIMUM
FIXED CEILING
SUSPENDED CEILING
MIS-4175

Manual 2100-752B
Page 8 of 49
Duct Work
All duct work must be properly sized for the design
airow requirement of the equipment. Air Conditioning
Contractors of America (ACCA) is an excellent guide to
proper sizing. All duct work or portions thereof not in
the conditioned space should be properly insulated in
order to both conserve energy and prevent condensation
or moisture damage.
Refer to Maximum ESP of Operation – Electric Heat
Only table on page 38.
Design the duct work according to methods given by
the Air Conditioning Contractors of America (ACCA).
When duct runs through unheated spaces, it should
be insulated with a minimum of 1" of insulation. Use
insulation with a vapor barrier on the outside of the
insulation. Flexible joints should be used to connect the
duct work to the equipment in order to keep the noise
transmission to a minimum.
The Q-TEC series has provision to attach a supply air
duct to the top of the unit. Duct connection size is 12"
x 20". The duct work is eld supplied and must be
attached in a manner to allow for ease of removal when
it becomes necessary to slide the unit out from the
wall for service. See Figure 7 for suggested attachment
method.
For hot water coil option, a QPBHW**-F for free blow or
QPBHW**-D for ducted airow is used.
When used with a ducted supply, a Q4CX Cabinet
Extension can be used to conceal the duct work above
the unit to the ceiling. This extends 20" above the unit
for a total height above the oor of 10'-7/8". The unit
is equipped with a variable speed indoor blower motor
which increases in speed with an increase in duct static
pressure. The unit will therefore deliver proper rated
air ow up to the maximum ESP shown in Table 11 on
page 38. However, for quiet operation of the air system,
the duct static should be kept as low as practical,
within the guidelines of good duct design.
Filters
The lters can be serviced from the front by opening
the hinged main doors (see Figure 8). Two (2) 1"
throwaway lters come standard with each unit.
Additional 1" and 2" lter options are available as
optional accessories.
NOTE: When installing new filters, make sure that
airflow arrows on filters point up.
NOTE: Unit cabinet, supply air duct and duct free
plenum are approved for “0” clearance to
combustible material.
The Q-TEC series are designed for use with free return
(non-ducted) and either free blow with the use of QPB
Plenum Box or a duct supply air system.
The QPB and QPBHW Plenum Box mounts on top
of the unit and has both vertically and horizontally
adjustable louvers on the front discharge grille.
FIGURE 7
Supply Duct Connections
Supply
duct (eld
supplied)
Attachment
screws (eld
supplied)
Room side of
Q-TEC unit
Duct ange provided
with unit
MIS-978
FIGURE 8
Filter Location
MIS-4177
FILTERS
DOORS
MIS-4177
Filters
Doors

Manual 2100-752B
Page 9 of 49
Switching Filter Sizes
To switch from 1" to 2" lters, remove the lter slide
and bend the tabs down out of the way to accommodate
the 2" lter (see Figures 9 and 10).
FIGURE 9
Filter Tabs in Up Position
FIGURE 10
Bend Filter Tabs Down
Fresh Air Intake
This unit may be equipped with a fresh air damper
assembly. The damper blade is locked in the closed
position when the unit is shipped from the factory. To
allow the damper to operate, remove the two plastic
locking pins, one on each end of the blade. This will
allow for maximum fresh airow. The damper blade will
now open when the indoor blower is operating. If less
than maximum fresh airow is required, re-insert the
plastic pins to limit damper blade opening to desired
level. Two extra pins are provided (taped to the inside
of the assembly) which may be used to hold the blade
in some position other than minimum or maximum
position. This fresh air assembly is located in the
rear of the unit and to gain access to make these
adjustments remove the air lter service door.
All capacity, efciency and cost of operation
information as required for Department of Energy
“Energyguide” Fact Sheets are based upon the fresh
air blank-off plate in place and is recommended for
maximum energy efciency.
The blank-off plate is available upon request from the
factory and is installed in place of the fresh air damper
shipped with each unit.
Vent Options
Barometric Fresh Air Damper (Standard)
Before starting, make sure the power has been turned
off. The return air grille panel must be removed. The
fresh air damper assembly can be seen on the back of
the unit (see Figure 11).
1. The fresh air damper is attached to the back of the
unit with one screw on either side of the assembly.
Both of the screws must be removed.
2. Once the mounting screws are removed, tilt the
assembly down and lift it out.
The mist eliminator can be seen through the opening.
The mist eliminator must be raised up and the bottom
can be pulled toward the front of the unit and removed.
FIGURE 11
Fresh Air Damper Assembly
MIS-4182
MOUNTING SCREWS

Manual 2100-752B
Page 10 of 49
Commercial Room Ventilator (Option)
Before starting, make sure the power has been turned
off. The commercial room ventilator (CRV) can be seen
after the main front doors are opened. The CRV must
be removed to gain access to the mist eliminator.
1. The two mounting screws in the front of the CRV
must be removed.
2. The power connectors for the CRV which are
located on the left side (unplug from left side
of voltage box in the control panel) must be
disconnected. Squeeze the tabs on the sides of the
connector and pull straight out.
3. Slide the CRV straight out of the unit.
The mist eliminator can be seen through the opening
in the back of the unit. The mist eliminator must be
raised up and the bottom can be pulled toward the
front of the unit and removed.
Q-TEC Energy Recovery Ventilator (Option)
Before starting, make sure that the power has been
turned off. The return air grille panel must be removed.
The energy recovery ventilator (QERV) can be seen after
the panel has been removed. To gain access to the mist
eliminator, the QERV must be removed.
1. The front ll plate of the QERV must be removed.
There is one screw on either side of the plate.
Remove these screws and remove the plate.
2. On either side of the QERV there are mounting
screws that hold the QERV in place. Remove both
of these screws.
3. Underneath the heat recovery cassette is a
power connector for the lower blower assembly.
To disconnect this plug, squeeze the tabs on
both sides of the plug to release the plug. While
squeezing the tabs, pull the plug out of the socket.
4. The QERV power plug is on the right side (unplug
from lter partition) and the control plug is on
the left (unplug from left side of voltage box in
the control panel). Both of these plugs must be
disconnected to remove the QERV. Squeeze the tabs
on the sides of the connector and pull straight out.
5. Slide the QERV assembly straight out of the unit,
being careful not to let the cassette slide out of the
QERV.
The mist eliminator can be seen through the opening
in the back of the unit. The mist eliminator must be
raised up and the bottom can be pulled toward the
front of the unit and removed.