Specifications

Manual 2100-549L
Page 41 of 59
RECOMMENDED CONTROL SEQUENCES
Several possible scenarios are listed below:
1. Use a programmable electronic thermostat with
auxiliary terminal to control the ERV based on
daily programmed occupance periods. Bard
markets and recommends Bard Part #8403-060
programmable electronic thermostat.
2.
Install a Bard CompleteStat with occupancy sensor
which learns the room usage and automatically
engages ventilation (see Figure 18).
3. Use a DDC control system to control the ERV based
upon a room occupancy schedule to control the
ERV.
4. Tie the operation of the ERV into the light switch.
The lights in a room are usually on only when
occupied.
5. Use a manual timer that the occupants turn to
energize the ERV for a specific number of hours.
6. Use a programmable mechanical timer to energize
the ERV and indoor blower during occupied periods
of the day.
NOTE: The ventilation package comes with a blower
interlock function, but is disabled when it is shipped
from the factory in case you do not utilize a thermostat
with an occupancy output, or a occupancy sensor
and must tie “A” terminal to “G” terminal to drive the
ventilation package. If you do have a thermostat or
control that does drive occupancy output, you will need
to remove the tape from the orange wire located in the
low voltage terminal box, and connect it to the “G”
terminal to activate this function. (See Figures 13-19.)
CHANGING VENTILATION CFM RATES
IN MANUAL MODE
To adjust the airflow ventilation rate, first refer to
Figure 25A to look up the “FLOW INDEX” needed
for the intake and exhaust blowers for the CFM you
require. Then, perform the following steps:
1. Open front swinging doors of main unit (by popping
front door latches).
2. Throw main power disconnect to the “OFF”
position to eliminate risk of injury or death due to
electrical shock.
3. Remove five (5) screws holding front ERV door in
place (see Figure 27).
4. Remove ERV Control Panel Cover by removing four
(4) screws (see Figure 27).
5. Locate two 0-10Vdc Motor Control Boards in
control panel (see Figure 28).
6. On intake Motor Control Board, observing “GREEN
STATUS LIGHT”, turn manual adjust potentiometer
“CCW” to increase “FLOW INDEX” or CW to
reduce “FLOW INDEX” to match desired setting.
NOTE: After long pause, the green status light will
blink long-blinks for the “TEN COUNT” of the “FLOW
RATE INDEX”, then immediately followed by fast blinks
which indicate the second digit. For example, a Flow
Index of 23 would be two long blinks, followed by 3
fast blinks of the “GREEN STATUS LIGHT”.
7. On exhaust Motor Control Board, observing
“GREEN STATUS LIGHT”, turn manual adjust
potentiometer “CCW” to increase “FLOW INDEX”
or CW to reduce “FLOW INDEX” to match desired
setting.
NOTE: Same “GREEN STATUS LIGHT” blink as Step #6.
CHANGING TO FULLY MODULATING
MODE
If you want to operate the ERV in fully variable mode (Fig.
25B) (only run at required speed to maintain set-point
CO2 levels), you will need to configure the ERV to the
following:
1. Open front swinging doors of main unit (by popping
front door latches).
2. Throw main power disconnect to the “OFF”
position to eliminate risk of injury or death due to
electrical shock.
3. Remove ERV Control Panel Cover by removing four
(4) screws (see Figure 27).
4. Locate two 0-10Vdc Motor Control Boards in
control panel (see Figure 28).
5. Pull jumper pins from “M” terminals, and move to
“P” terminals (see Figure 28).
6. Connect “+” 0-10Vdc output from CO2 control to
Terminal #3 (along with pink wire), and connect
“-” to Terminal #4 (along with purple wire) of unit
low voltage terminal strip.
7. Follow the directions supplied with the CO2 control
to configure the control appropriately.
8.500
5.500
2.336
1.370
1.370
2.585 2.585 2.585 .745
NO. NO.
DATE
PART
NAME
DWG.
Bryan, Ohio
DISTRIBUTION 1 2 3 4 5
MAT'L
Bard Mfg. Co.
CHECKED
DRAWN BYSCALE
PART
APPROVED
FORM:
BLACK
DISCONNECT ALL ELECTRICAL
NAMEPLATE LISTING.
IN SEVERE INJURY OR AMPUTATION.
IN SEVERE INJURY OR AMPUTATION.
END USE:
7961-754-2
C
LABEL SHEET #1
REMOVE TO DISASSEMBLE, DO NOT
REQUIRE PROPER PHASING. REFER
COLORS:
2 BLINKS
IN SERIOUS INJURY OR DEATH.
DISCONNECT THE REMOTE
7961-754
3 PHASE SCROLL COMPRESSORS
DIECUT SHEET
Suction
EXPOSED MOVING PARTS.
FAILURE TO DO SO CAN RESULT
ELECTRICAL SHOCK CAN RESULT
HI PR. SW./WATER SNSR. FAIL.
FAST BLINK
ELECTRIC POWER SUPPLY OR
IN SEVERE INJURY OR AMPUTATION.
POWER BEFORE SERVICING.
EXPOSED MOVING PARTS.
LO PRESS. SWITCH FAILURE1 BLINK
INDOOR/OUTDOOR
WARNING
DISCONNECT THE REMOTE
IN SERIOUS INJURY OR DEATH.
!
HAZARD OF ELECTRICAL SHOCK.
COMPRESSOR TIME DELAY
ROSE
WHITE BACKGROUND
MATERIAL:
DISCONNECT THE REMOTE
MODIFY FACTORY WIRING. DOING
LIGHT
OUTDOOR VINYL, SUPPLIER MUST BE CSA
7961-754-1
DISCONNECT ALL ELECTRICAL
ELECTRICAL SHOCK CAN RESULT
ELECTRIC POWER SUPPLY OR
(High)
7961-754-6
7961-754-10
DESCRIPTION
7961-754-1
WARNING
!
HAZARD OF ELECTRICAL SHOCK.
PHASES INCORRECT, REVERSE
PROPER START UP INFORMATION.
IMPORTANT
SUPPLIES BEFORE SERVICING.
IN SERIOUS INJURY OR DEATH.
GREEN
1:1
DARK ORANGE
HI PRESS. HARD LOCKOUT
CODE
APPROVED FOR ACCEPTABLE ADHESIVE
11/17/2011
PRESENT
SO MAY RESULT IN UNIT DAMAGE.
Discharge
7961-754-7
7961-754-8
7961-754-57961-754-5
2 UNIT SUPPLY LEADS. DO NOT
TO INSTALLATION INSTRUCTIONS FOR
Piece
Front Trim
TO DISASSEMBLE UNIT
UNIT TIE PLATE
VENT POWER CONN
ECTION
HP. BOARD TROUBLESHOOTING CODES
DESCRIPTION
UNPLUG AND REMOVE WIRE CLAMPS
NORMAL OPERATION
3 BLINKS
Bracket
EXPOSED MOVING PARTS.
SUPPLIES BEFORE SERVICING.
4 BLINKS
RED
CODE
CGB
(Low)
R-410A
7961-754-2
WARNING
!
HAZARD OF ELECTRICAL SHOCK.
DEFROST MODE ACTIVE
SLOW BLINK
SUPPLIES BEFORE SERVICING.
!
WARNING
DAY RSP
WARNING
!
!
BRIGHT YELLOW
WARNING
7961-754-2
7961-754-1
7961-754-3
3PHASELINE MONITORCODES
LIGHT
7961-754-4
PRINTING:
DISCONNECT ALL ELECTRICAL
UNIT TIE PLATE
PHASES CORRECT, Y SIGNAL
REMOVE TO DISASSEMBLE, DO NOT
OVERTIGHTEN BOLTS WHEN REPLACING
7961-754-9
OVERTIGHTEN BOLTS WHEN REPLACING
Top Wall
POWER BEFORE SERVICING.
FAILURE TO DO SO CAN RESULT
POWER BEFORE SERVICING.
FAILURE TO DO SO CAN RESULT
ELECTRICAL SHOCK CAN RESULT
ELECTRIC POWER SUPPLY OR
REV. DATE DESCRIPTION ECN NO DRN CHK APR
A 11/17/2011 REVISED 2 BLINKS CODE ON #7961-754-4 10629 CB SD RP
B 11/19/2012 REMOVED LOCKING CAPS TEXT ON 7961-754-3 10849 BR SD CB
C 10/30/2013 REVISED "4" BLINKS CODE ON 7961-754-4 11096 BD SD RP
7961-754 C