Bard CRVS-5A User manual

Page 1 of 17
For Use with Bard Heat Pump Models
T36-60H and T36-60S
Commercial Room Ventilator
with Exhaust
Model:
CRVS-5A
INSTALLATION INSTRUCTIONS
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual : 2100-760
Supersedes: NEW
Date: 12-8-21

Manual 2100-760
Page 2 of 17
CONTENTS
General .....................................................................3
General Information..............................................3
Unpacking...........................................................3
Description ..........................................................3
Models ................................................................3
CRV Features .......................................................3
Sequence of Operation.......................................... 3
Installation ..............................................................4
Basic Installation ................................................. 4
Blade Adjustment for Desired Ventilator Air ............8
“V” Option CRV Sequence of Operation ................10
FIGURES
Figure 1 Removal of Exterior Panels..................... 4
Figure 2 Removal of Air Filter and Exhaust
Cover Plate........................................... 5
Figure 3 Reroute Wires for Left Hand CRVS-5A
Units Only............................................ 6
Figure 4 Install Ventilator ................................... 7
Figure 5 CRV Control Board ................................ 9
Figure 6 CRV Control Board .............................. 10
Figure 7 8403-096 CO2 Sensor Set Up ............. 12
Figure 8 CRV Control Board Wiring .................... 13
Figure 9 Call for Blower Operation ..................... 16
Figure 10 Call for Compressor or Fan Only with
Ventilation Off .................................... 17
GRAPHS
Graph 1 Commercial Room Ventilator
Performance Data: T36 with CRVS-5A .. 14
Graph 2 Commercial Room Ventilator
Performance Data: T42 with CRVS-5A .. 14
Graph 3 Commercial Room Ventilator
Performance Data: T48 with CRVS-5A .. 15
Graph 4 Commercial Room Ventilator
Performance Data: T60 with CRVS-5A .. 15

Manual 2100-760
Page 3 of 17
General Information
The ventilator should only be installed by a trained
heating and air conditioning technician. These
instructions serve as a guide to the technician
installing the ventilator package. They are not
intended as a step-by-step procedure with which the
mechanically inclined owner can install the package.
The ventilator housing is shipped in one carton which
contains the electrical harness, miscellaneous hardware
and installation instructions.
Unpacking
Upon receipt of the equipment, be sure to compare the
model number found on the shipping label with the
accessory identication information on the ordering and
shipping document to verify that the correct accessory
has been shipped.
Inspect the carton housing of each ventilator as it is
received. Before signing the freight bill, verify that all
items have been received and that there is no visible
damage. Note any shortages or damage on all copies
of the freight bill. The receiving party must contact
the last carrier immediately, preferably in writing,
requesting inspection by the carrier’s agent. Concealed
damage not discovered until after loading must be
reported to the carrier within 15 days of its receipt.
Description
The CRVS-5A ventilator is designed to be used with
Bard heat pump models T36-60H and T36-60S. It is
an electromechanical vent system designed to provide
fresh air to meet indoor air quality standards.
Models
When installed in the above listed models, the CRV
provides built-in exhaust provisions. When the damper
blade opens to bring fresh air in, the damper also
opens an exhaust relief. The exhaust air will ow into
the condenser section of the unit. The condenser fan
will help draw exhaust air out.
CRV Features
• One piece construction—easy to install with no
mechanical linkage adjustment required.
• Exhaust air damper—built in with positive closed
position. Provides exhaust air capability to prevent
pressurization of tight buildings.
• Actuator motor—24 volt, power open, spring return
with built-in torque limiting switch.
• Provides up to 75% of outside air.
GENERAL
Electrical shock hazard.
Disconnect remote electrical power supply
or supplies before servicing.
Failure to do so could result in electric
shock or death.
!WARNING
Exposed moving parts.
Disconnect all electrical power before
servicing.
Failure to do so can result in severe injury
or amputation.
!WARNING
Sharp metallic edges.
Take care and wear appropriate protective
devices to avoid accidental contact with
sharp edges.
Failure to do so can result in personal injury.
!CAUTION
Sequence of Operation
On a call for blower operation, CRV will open to
pre-purge position as set by "PP" potentiometer
for the amount of time set by the PP jumper. The
CRV will then move to the position set by the "OCC"
potentiometer. If PP jumper is in 0 position, the CRV
will immediately open to the position set by the "OCC"
potentiometer.
A call for 1st stage cooling or heating cycles the
compressor, and the dampers reposition to the
Y1potentiometer setpoint. A call for 2nd stage
cooling or heating energizes compressor solenoid and
repositions the damper blade to the Y1 potentiometer
position. On loss of blower operation, CRV closes fully.

Manual 2100-760
Page 4 of 17
Model For Use with
Following Units
CRVS-5A
T36H
T42H
T48H
T60H
T36S
T42S
T48S
T60S
INSTALLATION
Basic Installation
1. Unpack the ventilator assembly which includes the
integral ventilator with attached electrical harness
and miscellaneous hardware.
2. Remove and save the existing exterior blower
access and service access panels on the Bard wall
mount unit (see Figure 1).
FIGURE 1
Removal of Exterior Panels
Open and lock disconnect switch before
installing this accessory to prevent injury or
death due to electrical shock or contact with
moving parts. Turn thermostat to o.
!WARNING

Manual 2100-760
Page 5 of 17
3. Remove and save existing unit air lter and screws
from front center grille (see Figure 2).
FIGURE 2
Removal of Air Filter and Exhaust Cover Plate
4. Remove and discard the exhaust cover plate.

Manual 2100-760
Page 6 of 17
5. For Installation of Left Hand Units Only
Remove strain relief in right side of CRVS (see
Figure 3). Unclip the two (2) wire ties holding the
wire harness. Reroute wires to left side of CRVS.
Re-install wire ties in left side holes. Route wires
through left side and re-install strain relief.
FIGURE 3
Reroute Wires for Left Hand CRVS-5A Units Only
6. Insert ventilator into the unit to the far left side
clearing the right lter bracket (see Figure 4).
Once the ventilator is fully inserted, slide the
ventilator to the right until it is tight against the
back of the control panel.
MIS-4341
FOR LEFT HAND UNITS
WIRED FOR RIGHT HAND UNITS.
LEFT END
FOR LEFT HAND UNITS, UNCLIP WIRE TIE
THROUGH LEFT END, REINSTALL
STRAIN RELIEF
RIGHT END
FOR LEFT HAND UNITS, REWIRE
STRAIN RELIEF & ROUTE WIRES
RE-CLIP WIRE TIE HERE
BASE

Manual 2100-760
Page 7 of 17
7. Open control panel to gain access to unit low
voltage terminal block.
8. Route electrical harness leads through the 7/8"
bushing in control panel into low voltage box as
shown in Figure 4.
FIGURE 4
Install Ventilator
IMPORTANT: Position front lip of ventilator on
top of front grille and condenser partition (see
Figure 4 inset). This is important to ensure
proper drainage of any water entering damper
assembly.
Note:
When installing CRV
position so hole infront
Plug the (4) Ø.125 holes
in the service door with
insert a self drilling screw.
WIRES
in condenser grille to
lip is centered over hole
CRV in unit
Right side of
Route the pink, purple,
grille and service door
MIS-2030 A
Lip of CRVisto be
canoe clips.
Service Door
with doors
removed
Front Grille
Front of unit
between the condenser
the upper grommet.
and black wires through
Place the provided ventilator slides
in the unit and position the vent package sides
on top of them. Use these to slide the vent into
the unit. Ventilator slides should be removed
after installation.

Manual 2100-760
Page 8 of 17
9. Connect leads with fork terminals to corresponding
points on unit terminal strip. (See manual 2100-
507 for air conditioner connection diagrams or
manual 2100-516 for heat pump connection
diagrams.)
10. Close control panel cover.
11. Replace left lter support, lter and four (4)
screws in condenser grille.
12. Re-install the blower access panel at top of unit
and secure with sheet metal screws.
13. Ventilator checkout:
A. Remove mist eliminator to allow access to
minimum position thumbwheel or blade stops.
B. Resupply power to unit.
C. Energize the evaporator blower by switching
thermostat to the manual fan position with
heat/cool in OFF position.
D. Ventilator should open to the position set
by the OCC potentiometer on the CRV
control board located on the top of the vent
(see Figure 5). On the CRVS, cycle OCC
potentiometer to full open through full close.
Observe damper blade operation throughout
travel to assure free, unobstructed movement.
E. De-energize evaporator blower. Damper blade
should close.
F. This completes ventilator checkout.
14. Adjust damper blade for required ventilation airow
in blower only, stage 1, and stage 2 cooling/heating
mode (see Blade Adjustment for Desired
Ventilation Air).
15. Replace mist eliminator. Be sure it is installed
with the drain holes to the bottom.
16. Remove blank off plate or barometric fresh air
damper installed on service access door. Plug four
(4) mounting holes with the plastic plugs provided
with the ventilator.
17. Replace service access panel.
18. Ventilator is now ready for operation.
Blade Adjustment for Desired
Ventilator Air
The amount of ventilation air supplied by the
commercial room ventilator is dependent on four (4)
factors:
1. Return air duct static pressure drop.
2. Supply air duct static pressure drop.
3. Indoor blower motor speed.
4. Damper blade open position setting.
Refer to the graph below to determine the blade setting
necessary to achieve the ventilation air required for
each operating mode.
Factory default settings are:
PP Potentiometer Closed Closed
OCC Potentiometer B B
Y1 Potentiometer B B
Y2 Potentiometer B B
Vent is factory set to supply between 100 and 200
CFM of fresh air in all modes of occupied operation.
For more accurate adjustment, use a owhood over
the intake opening to measure and adjust the airow
operation.
PP Potentiometer: Adjusts the airow during pre-purge
mode (If jumper is installed in positions 30-90)
OCC Potentiometer: Adjusts the airow during blower-
only operation, or during an occupied input from an
applicable thermostat.
Y1 Potentiometer: Adjusts the airow during 1st stage
cooling or heating operation
Y2 Potentiometer: Adjusts the airow during 2nd stage
cooling or heating operation
Energize blower only mode and adjust OCC
potentiometer to desired airow.
Energize 1st stage cooling mode and adjust Y1
potentiometer to desired airow.
Energize 2nd stage cooling mode and adjust Y2
potentiometer to desired airow.
If pre-purge mode is desired, de-energize cooling
modes. Move PP jumper to the 30-, 60-, or 90-minute
position and adjust PP potentiometer to desired airow.
Minimum damper position when using CO2control
damper should be fully closed at 700 ppm or lower,
if not potentiometer OCC can be adjusted counter-
clockwise (CCW) to close it. If it is fully closed at 700
ppm or lower, no adjustments required.

Manual 2100-760
Page 9 of 17
MIS-4047
60
30
90
0
STAGE ONE COOLING
POT "Y1" SETTING FOR
WHEN Y2 IS ENERGIZED
COOLING OR BLADE POSITION
Y1 WILL OVERRIDE OCC
POT "PP" PRE-PURGE
SET FOR PREOCCUPANCY
POT "OCC" OCCUPIED SETTING
TURN OFF FOR C02
FULL MODULATION
SETTING FOR 2ND STAGE
PRE-PURGE
TIMER
FIGURE 5
CRV Control Board

Manual 2100-760
Page 10 of 17
"V" Option CRV Sequence of Operation
The “V” Ventilation option includes a control board with
blade positioning potentiometers along with an input
for a 2-10V input signal (see Figure 6).
Adjustable potentiometers:
“PP” Potentiometer setting: This potentiometer can be
used to adjust the blade setting for outdoor air intake
during a pre-purge cycle. The pre-purge cycle time is
based on the setting of the pre-purge timer.
“OCC” Potentiometer setting: This potentiometer can
be used to adjust the blade setting for outdoor air
intake when the “01” terminal is energized on the low
voltage terminal strip indicating occupancy.
“Y1” Potentiometer setting: This potentiometer can be
used to adjust the blade setting for outdoor air intake
when the “Y” terminal is energized on the low voltage
terminal strip indicating 1st stage cooling or Balanced
Climate operation. When energized, it overrides the
“OCC” potentiometer setting.
“Y2” Potentiometer setting: This potentiometer can be
used to adjust the blade setting for outdoor air intake
when the “Y1” terminal is energized on the low voltage
terminal strip indicating 2nd stage cooling operation.
When energized, it overrides the “OCC” and “Y1”
potentiometer settings.
Pre-Purge Feature
Pre-purge is used to ventilate a specied CFM amount
before occupants enter the room or structure. The
control board has a built-in pre-purge timer that can
be set to 30-, 60- and 90-minute intervals by moving
the jumper noted in Figure 5 on page 9. This timer will
start when the jumper is installed and the "01" terminal
is energized on the low voltage terminal strip. Blade
adjustment can be made on the PP potentiometer.
Once the timer has timed out, the board will default
to the occupied setting and this blade position can
be adjusted on the OCC potentiometer. If the timer is
set to 0 (off—shipped position), the occupied setting
is instantaneous and the pre-purge setting (PP) is no
longer in the sequence.
Occupied Setting
Occupied is used to ventilate a specied CFM amount
when occupants enter the room or structure. The
control board will energize the occupied setting
after the pre-purge cycle, or if pre-purge is disabled
immediately when the "01" terminal is energized on the
low voltage strip. Blade adjustment can be made on the
OCC potentiometer.
Y1 Setting
Y1 is used to ventilate a specied CFM amount when
Y cooling is energized. The control board will energize
the Y1 setting when Y is energized on the low voltage
strip. Blade adjustment can be made on the Y1
90
60
30
0
FIGURE 6
CRV Control Board
potentiometer. This potentiometer setting overrides the
OCC occupied setting.
Y2 Setting
Y2 is used to ventilate a specied CFM amount when
Y1 cooling is energized. The control board will energize
the Y2 setting when Y1 is energized on the low voltage
strip. Blade adjustment can be made on the Y2
potentiometer. This potentiometer setting overrides the
OCC occupied and the Y1 setting.
2-10V Operation
A CO2sensor or other device sending a 2-10V signal
can be used to control the damper motor. Two control
methods are available to control the damper motor:
• Method 1: The control board will accept a
2-10VDC signal with a resistive load greater than
5000 ohms. Bard CO2sensor 8403-096 can be
used when the 2-10V output is connected to the
blade connector on the unlanded gray wire from
the CRV, located near the unit low voltage terminal
strip. The occupied OCC potentiometer setting
must be set to the off position for total modulation.
The OCC potentiometer can be used to maintain a
minimum blade position when "01" is energized.
• Method 2: The damper motor will accept a
2-10VDC signal with a resistive load less than
5000 ohms. This method involves bypassing the
control board and powering the motor directly from
the device providing the 2-10VDC modulating
signal. The gray wire connected to CO2VIN on the
control board must be spliced with the white wire

Manual 2100-760
Page 11 of 17
ran to the damper motor (OUT on control board).
The other end of the gray wire should be connected
to the CO2sensor as stated in Method 1.
During 2-10VDC operation with "01" energized and
pre-purge timed operation active, DC voltage signaling
occupancy from a source such as a CO2sensor will
increase ventilation amounts as needed.

Manual 2100-760
Page 12 of 17
FIGURE 7
8403-096 CO2Sensor Set Up
ON
OFFOFFOFF
ON
4 65
23
ON
1
PRESS UP AND DOWN
ARROWS TO ENTER
CONFIGURATION MODE
USE ARROWS TO SELECT
SETTING. PUSH MIDDLE
BUTTON TO CHANGE.
CONTROLLER WILL
SHOW SET.
IT HAS BEEN CONFIGURED.
DIP SWITCH TO "OFF" AFTER
CONTROLLER MOVE
NOTE: MENU
DIP SWITCH MUST
BE IN "ON" POSITION #5
TO CHANGE ANY
SETTINGS WITH
THE SIDE BUTTONS.
TO LOCK THE CO2
DIP SWITCHES MUSTBE
POSITIONED AS SHOWN
FOR PROPER OPERATION MIS-4025 C
Settings Recommended Default
RON
(RELAY ON SET POINT) 725
ROF
(RELAY OFF SET POINT) 700
DSP
(DISPLAY
CONFIGURATION) C CT
UNI
(UNITS SELECTION) US US
COL
(CO2 LOW OUTPUT
RANGE) 700 0
COH
(CO2 HIGH OUTPUT
RANGE) 1500 2000
TOL
(TEMP. LOW OUTPUT
RANGE) Not Used
TOH
(TEMP. HIGH OUTPUT
RANGE) Not Used
BAR
(BAROMETRIC
PRESSURE)
See Instructions with
Controller For High
Altitude Installations
CAL
(CALIBRATION) Used for Field Calibration

Manual 2100-760
Page 13 of 17
FIGURE 8
CRV Control Board Wiring
3
1
2
5
4
6
UNIT LOW VOLTAGE
BROWN/WHITE
TERMINAL STRIP
OPTIONAL
YELLOW/WHITE
OPTIONAL
PURPLE
OPTIONAL WHEN
INDOOR FAN IS ON
MODULATING CO2 CONTROL
*A -
RED/WHITE
CONTROL
FDBK
24V
COM
KEY
ON/OFF CO2 CONTROL
*B -
*C
BE O1
4056-261 A
CY1Y
*D
W1
RG
*C - SINGLE-STAGE UNIT
*D - FIELD JUMPER FOR
CONSTANTVENTILATION
BLACK/WHITE
BROWN/WHITE
ORANGE
BROWN/WHITE
RELAY
BLACK/WHITE
56
30
0
CRV-CONTROL BOARD
60
-
Damper Motor
RED
BLACK BROWN
*A
CO2 Sensor
90
*A
OPTIONAL CO2 CONTROL
*B
55
+
REQUIRED FIELD WIRING FOR
CO2 VENTILATION OPERATION.
IN *B CONFIGURATION FOR MODULATING
PANEL UNLESS A CO2 SENSOR ISINSTALLED
GRAY WIREISDEAD-ENDED IN CONTROL
59
56
57
*UNUSED-
TAPE OFF*
WHITE
57
L
W2
GRAY
NC
NO
1
COM
49
MOVE THIS BROWN/WHITE WIRE
FROM COM TO NC IF JUMPERIS USED
BETWEEN01 AND G.

Manual 2100-760
Page 14 of 17
0
200
400
600
800
1000
1200
A B C D E F
Airflow (CFM)
Blade Position
T36S1 with CRVS-5,CRVP-5 & CHCRV-5
Vent Air, Cooling/Heating Mode Total Air, Cooling/Heating Mode
0
200
400
600
800
1000
1200
1400
A B C D E F
Airflow (CFM)
Blade Position
T42S1 with CRVS-5,CRVP-5 & CHCRV-5
Vent Air, Cooling/Heating Mode Total Air, Cooling/Heating Mode
GRAPH 1
Commercial Room Ventilator Performance Data: T36 with CRVS-5A
GRAPH 2
Commercial Room Ventilator Performance Data: T42 with CRVS-5A

Manual 2100-760
Page 15 of 17
0
100
200
300
400
500
600
0246810 12 14 16 18
Air flow (CFM)
Vent Position
T48S1 Vent Airflow
Blower Only Vent
Airflow 0.2 ESP
High Speed
Comp Vent
Airflow 0.2 ESP
A B C D E F
0
100
200
300
400
500
600
700
0246810 12 14 16 18
Air flow (CFM
Vent Position
T60S1 Vent Airflow
High Speed Comp
Vent Airflow 0.2 ESP
Blower Only Vent
Airflow 0.2 ESP
A B C D E F
GRAPH 3
Commercial Room Ventilator Performance Data: T48 with CRVS-5A
GRAPH 4
Commercial Room Ventilator Performance Data: T60 with CRVS-5A

Manual 2100-760
Page 16 of 17
MIS-347A
Supply Air
Evaporator
Coil
DAMPER BLADE EXHAUST AIR
Return Air
Condenser Air
Direction
Condenser
Coil
Outside Air
FIGURE 9
Call for Blower Operation

Manual 2100-760
Page 17 of 17
FIGURE 10
Call for Compressor or Fan Only
with Ventilation Off
MIS-348A
Supply Air
Return Air
Evaporator
Coil
DAMPER BLADE
Condenser Air
Direction
Condenser
Coil