Bard CRVMP-5 Installation Instructions Manual

INSTALLATION INSTRUCTIONS

COMMERCIAL ROOM VENTILATORS

WITH EXHAUST

MODEL

CRVMP-5

For Use with Bard 3 through 5 Ton

WA*S Series Wall Mount Air Conditioners

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

Since 1914...Moving ahead just as planned.

Manual : 2100-457D
Supersedes: 2100-457C
File: Volume III Tab 19
Date: 01-24-14

Manual 2100-457D
Page 1 of 16

CONTENTS

General

General Information
Unpacking
Description

Models .................................................................3

Installation

Basic Installation
Blade Adjustment for Desired Ventilator Air
Adding Optional CO
Commercial Room Ventilator Sequence

.................................................................3

................................................................3

..................................................3

....................................................4-8

............10

Control Sensor ......................13

2

.........15 & 16

Figures

Figure 1 Removal of Exterior Panels ......................4

Figure 2

Figure 3 Install Ventilator ........................................6

Figure 4 Step Control Installation ...........................8

Figure 5 Damper Control Board .............................9

Figure 6 CO2 Sensor Set-Up (8403-056) .............14

Figure 7 Call for Blower Operation .......................15

Figure 8 Call for Cooling Operation ......................16

Tables

Table 1 .................................................................4

Graphs

WA3S Ventilation Airow
WA4S Ventilation Airow
WA5S Ventilation Airow

Remove Air Filter & Exhaust Cover Plate

.........................................11

.........................................11

.........................................12

.....5

BARD MANUFACTURING COMPANY, INC.

Manual 2100-457D
Page 2 of 16

BRYAN, OHIO USA 43506

GENERAL

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, step control assembly,
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, and 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 CRVMP-5 ventilator is designed to be used with
Bard 3 through 5 ton wall mount series step capacity
air conditioners. It is an electromechanical vent system
designed to provide fresh air to meet indoor air quality
standards. It automatically adjusts to the mode of
operation to maintain consistent fresh air intake levels.
Examples are blower only, stage 1 cooling and stage 2

cooling, which are all set for different total airows.

MODELS

When installed in the above-listed models, the
CRVMP-5 provides built in exhaust provisions.
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.

When

Manual 2100-457D
Page 3 of 16

INSTALLATION

BASIC INSTALLATION

1. Unpack the ventilator assembly which includes the
integral ventilator with attached electrical harness,
step control assembly and miscellaneous hardware.

WARNING

Open and lock unit disconnect switch before
installing this accessory to prevent injury or
death due to electrical shock or contact with
moving parts. Turn thermostat to off.

REMOVAL OF EXTERIOR PANELS

2. Remove and save the existing exterior blower

FIGURE 1

TABLE 1

Model

CRVMP-5

access and service access panels on the Bard wall
mount unit. (See Figure 1.)

FOR USE WITH

FOLLOWING UNITS

WA3S
WA4S
WA5S

Manual 2100-457D
Page 4 of 16

3. Remove and save existing unit air lter and screws

from front center grille. (See Figure 2.)

REMOVE AIR FILTER AND EXHAUST COVER PLATE

4. Remove and discard the exhaust cover plate.

FIGURE 2

Manual 2100-457D
Page 5 of 16

5. Install ventilator sheet metal assembly by inserting
the ventilator into the unit to the far left side

clearing the right lter bracket. Once the ventilator

is fully inserted, slide the ventilator to the right
until it is tight against the back of the control panel.
(See Figure 3.)

IMPORTANT: Position front lip of ventilator on top of

front grille and condenser partition. (See Figure 3
inset.) This is important to ensure proper drainage
of any water entering damper assembly.

FIGURE 3

INSTALL VENTILATOR

6. Open control panel to gain access to unit low
voltage terminal block.

7. Route electrical harness leads through the 7/8"
bushing in control panel (Figure 3) into low voltage
box.

FIGURE 3 INSET

SIDE SECTION

Manual 2100-457D
Page 6 of 16

8. Connect “orange lead” with the fork terminal to
either the “G” terminal of the low voltage strip
(will ventilate anytime there is a call for the
blower), or the “F” terminal (can be used as a
junction point for on-demand ventilation with a
capable thermostat or occupancy sensor).

9. The pink, purple and black wires will pass through
bushing on opposite side of low voltage box where
they entered, and will run up the wire loom to the
step-control assembly for connection installed in
Step #10, Figure 4 following the wiring diagram
(enclosed in Literature Assembly or on ventilator).

10. Locate the step control assembly packaged with the
assembly. This assembly will install in the upper
left-hand corner of the control panel by aligning
the plastic standoffs with pre-punched holes in the
control panel. See Figure 4.

11. Route the wires from the step control assembly
down the control panel through the wire looms,
and route them into the low voltage box through
the bushing. See Figure 4. Make connections
following the wiring diagram (enclosed in
Literature Assembly or on ventilator).

12. Replace left lter support, lter and four (4) screws

in condenser grille.

13. Reinstall the blower access panel at top of unit and
secure with sheet metal screws.

14. Ventilator checkout – (Note: It may be more

efcient to disconnect the thermostat from the
low voltage terminal strip and use a set of jumper
wires to perform these steps.)

A. Resupply power to the unit.
B.

Energize the evaporator blower by switching

thermostat to the manual fan position with
heat/cool in OFF position. (Jumper “R” to “G”)

C. Ventilator should open to the position set by

“R1” potentiometer on step control board. (See
Figure 5.)

D. Now energize Stage #1 cooling/heating by

switching the thermostat to the corresponding
mode and setting the temperature offset slightly
beyond the actual room temperature. (Jumper

“R” to “G” and “Y1”)

E. Ventilator should now open to the position set

by “R2” potentiometer on step control board.
(See Figure 5.)

Manual 2100-457D
Page 7 of 16

F. Now energize the Stage #2 cooling/heating by

910-1622 STEP CONTROL ASSEMBLY. INSTALLS
HERE BY SEATING PLASTIC STAND-OFFS INTO
PROVIDED HOLES

ROUTE WIRES THROUGH
EXISTING WIRE LOOMS

ROUTE WIRES THROUGH BUSHING
INTO LOW VOLTAGE BOX

WIRES FROM
DAMPER MOTOR

MIS-2116

increasing the thermostat setting to a greater
offset than the actual room temperature.

(Jumper “R” to “G”, “Y1” and “Y2”)

G. Ventilator should now open to the position set

by “R3” potentiometer on step control board.
(See Figure 5.)

H. Now turn the heat/cool selector to OFF, and set

the fan switch back to AUTO. The damper
blade should close. (Remove all jumper

connections.)

I. This completes the ventilator checkout.

FIGURE 4

STEP CONTROL INSTALLATION

15. Adjust damper blade for required ventilation.
(See next section.)

16. Replace mist eliminator lter. Be sure that it is

installed with the drain holes to the bottom.

17. 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.

18. Replace service access panel.

19. Close control panel cover.

20. Ventilator is now ready for operation.

Manual 2100-457D
Page 8 of 16

FIGURE 5

MIS-2117 A

"R2" ADJUSTMENT POTENTIOMETER
FOR "STAGE #1" HEATING OR COOLING
DAMPER POSITION. ("G" AND "Y1"
CONTROL SIGNALS)

FOR "STAGE #2" HEATING OR COOLING
DAMPER POSITION. ("G", "Y1", AND
"Y2" CONTROL SIGNALS)

"R3" ADJUSTMENT POTENTIOMETER"R1" ADJUSTMENT POTENTIOMETER
FOR "BLOWER ONLY" DAMPER POSITION.
("G" SIGNAL ONLY)

"R7" ADJUSTMENT POTENTIOMETER
FOR APPLICATIONS WITH CO2 SENSORS.
SEE "ADDING OPTIONAL CO2 CONTROL
SENSOR" IN THIS MANUAL.

SETTING 3-POSITION CRV DAMPER CONTROL BOARD

(Utilize the charts for your specic model on the following pages)

Manual 2100-457D
Page 9 of 16

BLADE ADJUSTMENT FOR DESIRED
VENTILA TOR AIR

The amount of ventilation air supplied by the

commercial room ventilator is dependent on ve (5)

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 for each mode
of operation.

5. Tightness or looseness of building envelope.

You will have to set the damper position for each mode
of operation using the set-point potentiometers on the
Damper Position Step Control Board. See Figure 5.

Refer to the graphs on the following pages to determine
the necessary blade setting to achieve the ventilation
air required based upon blower only, Stage #1 and
Stage #2 modes of operation. These charts are model

specic, so you will have to match the chart to the
specic model you are working with.

1. Set the damper position for blower only operation.

A. Energize the evaporator blower by switching
thermostat to the manual fan position with
heat/cool in OFF position (or Jumper “R” to
“G” with thermostat disconnected at unit).

B. Locate potentiometer “R1” on the Damper
Position Step Control Board. See Figure 5.

C. Using a small screwdriver, adjust
potentiometer until damper position aligns
with numerical location on the label interior
of the sheet metal damper assembly.

2. Set the damper position for Stage #1 cooling/
heating operation.

A. Energize the evaporator blower and
compressor by switching thermostat to the heat
or cool mode, and setting it to a minimal offset
to the room temperature to engage the mode of
operation desired (or Jumper “R” to “G”

and “Y1” with thermostat disconnected at
unit).

B. Locate potentiometer “R2” on the Damper
Position Step Control Board. See Figure 5.

C. Using a small screwdriver, adjust
potentiometer until damper position aligns
with numerical location on the label interior of
the sheet metal damper assembly. (Make sure
there is not a call on “Y2” or “W2”.)

3. Set the damper position for Stage #2 cooling/
heating operation.

A. Energize the evaporator blower and
compressor by switching thermostat to the heat
or cool mode and set a large temperature offset
to the room temperature to engage the mode of
operation desired (or Jumper “R” to “G”,

“Y1” and “Y2” with thermostat disconnected

at unit).

B. Locate potentiometer “R3” on the Damper
Position Step Control Board. See Figure 5.

C. Using a small screwdriver, adjust
potentiometer until damper position aligns
with numerical location on the label interior of
the sheet metal damper assembly per the chart.

Manual 2100-457D
Page 10 of 16

0

100

200

300

400

500

600

700

800

0

2.557.51012.51517.52022.52527.5

30

Ventilation Airflow (CFM)

Vent Position

WA3S Ventilat ion Airflow

Stage #2
Operation

Blower Only &
Stage #1
Operation

0

100

200

300

400

500

600

700

800

900

1000

0

2.557.51012.51517.52022.52527.5

30

Ventilation Airflow (CFM)

Vent Position

WA4S Ventilat ion Airflow

Stage #2
Operation

Stage #1
Operation

Blower Only

Manual 2100-457D
Page 11 of 16

0

100

200

300

400

500

600

700

800

900

1000

0

2.557.51012.51517.52022.52527.5

30

Ventilation Airflow (CFM)

Vent Posit ion

WA 5S V entilat ion Airflow

Stage #2
Operation

Stage #1
Operation

Blower Only

Manual 2100-457D
Page 12 of 16

ADDING OPTIONAL CO2 CONTROL
SENSOR

Adding an optional Bard Part #8403-067 to this control
will maximize the capabilities of this vent by only
supplying fresh air intake to maintain CO2 levels. This

has multiple benets.

• Minimizes ventilation load on structure as it only
brings in what is required to maintain CO2 levels
lowering reconditioning requirements (not having to
heat/cool as much outside air).

• Will self-adjust for various occupancy levels so
that you are not bringing in fresh air beyond need.
For example, if a room is designed for a maximum
occupancy of 40 persons (the standard ventilation
control would have to be set for that occupancy), but
the room typically only contains 25 persons. This
control will self-adjust the amount of fresh air intake
from 600 to 375 CFM automatically (based upon 15
CFM per person standard rate to ASHRAE standards).

BASIC INSTALLATION

1. Make sure power is turned off to the unit

2. Follow steps beginning on page 2 for installation
for standard control and vent assembly, then
proceed with the following steps.

3. Run (4) wire thermostat wire from the unit to the
desired CO2 sensor location.

4. Follow Figure 6 to congure the CO

sensor for

2

proper operation.

5. Connect the thermostat wiring from the CO2 sensor
to step control assembly following the wiring
diagram (enclosed in Literature Assembly or on
ventilator).

6. Connect the orange wire from the “A” terminal
of the units low voltage connection strip to the
“OCC” terminal on the step control board.

7. To check operation, restore power to the unit.

8. Make sure that thermostatic control is in
“occupied” mode of operation calling for
ventilation.

9. Have someone stand in front of the CO2 sensor and
breathe on it. The display should show an increase
in CO2 ppm and the damper blade in the ventilation
package should increase (may be good to have a
helper - one to breathe on control and one to
observe damper).

Manual 2100-457D
Page 13 of 16

FIGURE 6

17

12

FULLY OPEN150020

16145019

15140018

14135017

12130016

11125015

10120014

9115013

81100

MIS-3009 A

4-20mA AN (ppm) Damper (1)

Approc. Blade

Position (2)
4 700 FULLY CLOSED 0
5 750 1

6 800 2
7 850 3
8 900 4
9 950 5

10 1000 6
11 1050 7

Settings Recommended Default

RON Not Used
ROF Not Used
DSP C CT

UNI US US
COL 700 0
COH 1500 2000

TOL Not Used

TOH Not Used
BAR

See Instrution with Controller
For High Altitude Installations

CAL Used for Field Calibration

(1) Damper should be fully closed at 700 ppm, if not Potentiometer R7 can be adjusted
clockwise (CW) to close it. If it is fully closed at 700 ppm or lower no adjustments required.
(2) Blade as referenced to the Blade Position Label.

PRESS UP AND DOWN
ARROWS TO ENTER
CONFIGURATION MODE
USE ARROWS TO SELECT
SETTING. PUSH MIDDLE
BUTTON TO CHANGE.
CONTROLLER WILL
SHOW SET.

FOR PROPER OPERATION

POSITIONED AS SHOWN

JUMPERS MUST BE

NOTE: MENU
JUMPER MUST
BE SET TO "ON"
TO CHANGE ANY
SETTINGS WITH
THE FRONT BUTTONS.
TO LOCK THE CO2
CONTROLLER MOVE
JUMPER TO "OFF" AFTER
IT HAS BEEN CONFIGURED

8403-067 CO2 SENSOR SET UP

Manual 2100-457D
Page 14 of 16

COMMERCIAL ROOM VENTILATOR –
WA*S SERIES

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.

CALL FOR BLOWER OPERATION

• Actuator motor – 24 volt, power open, spring return

with built in torque limiting switch.

• Provides up to 75 percent of outside air.

COMMERCIAL ROOM VENTILATOR
SEQUENCE OF OPERATION

On a call for blower operation, CRV opens to a
position as set by Step Control Position Assembly. See
Figure 7.

FIGURE 7

Manual 2100-457D
Page 15 of 16

A call for cooling cycles the compressor, and dampers
remain in the ventilation mode. On loss of blower
operation, CRV closes fully. See Figure 8.

CALL FOR COOLING OPERATION

FIGURE 8

Manual 2100-457D
Page 16 of 16