Manual 2100-578E
Page
29 of 41
I-TEC
COMMERCIAl ROOM
VENTIlATOR SYSTEM
GENERAl DESCRIPTION
The I-TEC Commercial Room Ventilator (CRV) is
designed to be used with all Bard I-TEC models. The
only intent of this device is to provide the required
ventilation by delivering fresh air to meet I.A.Q. (Indoor
Air Quality) requirements. In the installed application,
this system also includes exhaust provisions which
are balanced with the intake air to maintain building
pressurization requirements of ASHRAE 62.1 Standard.
Ventilation is accomplished with (2) blower/
motor assemblies for maximum ventilation at low
sound levels. The intake and exhaust blowers are
programmed independently and are balanced to
maintain a slight positive pressurization in accordance
to ASHRAE 62.1 Standard.
The I-TEC CRV is also provided with filters to reduce
the required service needed and to further improve the
I.A.Q. The exhaust air blowers and intake air blowers
are protected by two (2) throw away filters. Both are
accessible without the need for tools.
CONTROl WIRING
The I-TEC CRV comes wired from the factory set to
450 CFM of ventilation. Care must be taken when
deciding how to control the operation of the ventilator.
When designing the control circuit for the ventilator, the
following requirements must be met.
1. The indoor blower must be run whenever the I-TEC
CRV is run.
2.
Select and configure the correct CFM ventilation
level that the I-TEC CRV needs to operate and
configure the system to this level following later
instructions within this section. Over ventilating
serves no useful purpose and significantly affects
the overall efficiency of the heat pump system.
System operating costs would also increase.
3. Run the I-TEC CRV only during periods when the
conditioned space is occupied. Running the
ventilation during unoccupied periods wastes
energy, decreases the expected life of the CRV,
and can result in large moisture buildup in the
structure. Running the CRV when the structure is
unoccupied allows moisture to build up in the
structure because there is little or no cooling load.
Thus, the air conditioner is not running enough to
remove the excess moisture being brought in. Use
a control system that in some way can control the
system based upon occupancy.
RECOMMENDED CONTROl SEqUENCES
Several possible scenarios are listed below:
1. Use a programmable electronic thermostat with
auxiliary terminal to control the CRV based on
daily programmed occupance periods. Bard
markets and recommends Bard Part #8403-060
programmable electronic thermostat.
2. Use Bard CompleteStat™ that incorporates
temperature, humidity and occupancy control with
learning capability into a single device. No
programming required.
3. Use a DDC control system to control the CRV based
upon a room occupancy schedule to control the CRV.
4. Tie the operation of the CRV 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 CRV for a specific number of hours.
6. Use a programmable mechanical timer to energize
the CRV 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 11-13.)
SETTING THE VENTIlATION CFM lEVElS
The I-TEC CRV has four pre-set levels of ventilation
CFM available. These are 300, 375, 450 and 525 CFM
of ventilation air. The I-TEC CRV is shipped from the
factory set on the 450 CFM ventilation level. To change
between these four different levels of provided ventilation
CFM, first refer to Figure 15 to look up the corresponding
CFM needed for the intake and exhaust blowers to meet
the design criteria and determine which “speed/wire
color” is needed. 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 six (6) screws holding front CRV door in
place (See Figure 16).
4. Locate “Brown Wire with White Trace” that has
a black terminal on the end where it connects to
the terminal strip (See Figure 15).
5. Move “Brown Wire with White Trace” to the
corresponding CFM level needed in accordance
with Figure 15.
Operating the
I-TEC
CRV during unoccupied periods can
result in a build up of excess moisture in the structure.
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 BY
SCALE
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
RE
QU
IR
E
PR
OPE
R
PH
AS
IN
G.
RE
FER
COLORS:
2 BLINKS
IN SERIOUS INJURY OR DEATH.
DISCONNECT THE REMOTE
7961-754
3
PH
ASE
SCR
OLL
CO
M
PR
ESS
ORS
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 FAILURE
1 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
PR
OPE
R
ST
AR
T
UP
IN
FO
RM
AT
IO
N.
IM
P
OR
TA
NT
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
7961-754-5
7961-754-5
2 UNIT SUPPLY LEADS. DO NOT
TO
IN
ST
ALL
AT
IO
N I
NS
TRUC
TI
ON
S
FO
R
P
iece
F
ron
tT
rim
TO DISASSEMBLE UNIT
UNIT TIE PLATE
VENT POWER CONNECTION
HP. BOARD TROUBLESHOOTING CODES
DESCRIPTION
UNPLUG AND REMOVE WIRE CLAMPS
NORMAL OPERATION
3 BLINKS
B
racket
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
3 PHASE LINE MONITOR CODES
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
T
op
W
all
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
