Manual 2100-578B
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
PART
NAME
MAT'L
Bard Mfg. Co.
Bryan, Ohio
DATE
DRAWN BY
SCALE
DISTRIBUTION
1 2 3 4 5
CHECKED
DWG.
NO.
NO.
PART
APPROVED
IN SERIOUS INJURY OR DEATH.
FORM:
INDOOR/OUTDOOR
DIECUT SHEET
END USE:
B
LABEL SHEET #1
7961-754
1:1
MATERIAL:
BLACK
CGB
DAY
RSP
7961-754-3
ELECTRIC POWER SUPPLY OR
HAZARD OF ELECTRICAL SHOCK.
!
FAST BLINK
7961-754-1
11/17/2011
7961-754 B
WARNING
!
PRINTING:
2 BLINKS
DISCONNECT THE REMOTE
WARNING
WHITE BACKGROUND
HAZARD OF ELECTRICAL SHOCK.
SUPPLIES BEFORE SERVICING.
COLORS:
OUTDOOR VINYL, SUPPLIER MUST BE CSA
ROSE
DISCONNECT THE REMOTE
MODIFY FACTORY WIRING. DOING
LIGHT
IN SERIOUS INJURY OR DEATH.
SO MAY RESULT IN UNIT DAMAGE.
GREEN
PRESENT
CODE
RED
IN SEVERE INJURY OR AMPUTATION.
SUPPLIES BEFORE SERVICING.
7961-754-6
7961-754-10
DESCRIPTION
PHASES INCORRECT, REVERSE
PR
OPE
R
ST
AR
T
UP
IN
FO
RM
AT
IO
N.
IM
P
OR
TA
NT
DISCONNECT ALL ELECTRICAL
ELECTRICAL SHOCK CAN RESULT
ELECTRIC POWER SUPPLY OR
2 UNIT SUPPLY LEADS. DO NOT
7961-754-7
7961-754-8
7961-754-5
TO
IN
ST
ALLA
TIO
N IN
ST
RUC
TIO
NS
FO
R
LIGHT
3 PHASE LINE MONITOR CODES
IN SERIOUS INJURY OR DEATH.
R-410A
CODE
HI PRESS. SOFT LOCKOUT
7961
-754
-2
DISCONNECT THE REMOTE
REMOVE TO DISASSEMBLE, DO NOT
PHASES CORRECT, Y SIGNAL
P
iece
7961-754-5
F
ron
tT
rim
TO DISASSEMBLE UNIT
HP. BOARD TROUBLESHOOTING CODES
UNIT TIE PLATE
VENT POWER CONNECTION
UNPLUG AND REMOVE WIRE CLAMPS
DESCRIPTION
4 BLINKS
NORMAL OPERATION
3 BLINKS
7961-754-4
UNIT TIE PLATE
B
racket
EXPOSED MOVING PARTS.
DISCONNECT ALL ELECTRICAL
IN SEVERE INJURY OR AMPUTATION.
DISCONNECT ALL ELECTRICAL
IN SEVERE INJURY OR AMPUTATION.
T
op
W
all
OVERTIGHTEN BOLTS WHEN REPLACING
OVERTIGHTEN BOLTS WHEN REPLACING
DARK ORANGE
WARNING
!
HAZARD OF ELECTRICAL SHOCK.
DEFROST MODE ACTIVE
SLOW BLINK
SUPPLIES BEFORE SERVICING.
!
WARNING
WARNING
!
!
APPROVED FOR ACCEPTABLE ADHESIVE
ELECTRICAL SHOCK CAN RESULT
WARNING
7961
-754
-2
7961-754-1
EXPOSED MOVING PARTS.
FAILURE TO DO SO CAN RESULT
POWER BEFORE SERVICING.
7961-754-1
HI PR. SW./WATER SNSR. FAIL.
7961-754-9
REMOVE TO DISASSEMBLE, DO NOT
POWER BEFORE SERVICING.
EXPOSED MOVING PARTS.
7961
-754
-2
FAILURE TO DO SO CAN RESULT
RE
QU
IR
E
PR
OPE
R
PH
AS
IN
G.
RE
FER
3
PH
ASE
SCR
OLL
CO
MP
RESS
ORS
LO PRESS. SWITCH FAILURE
1 BLINK
COMPRESSOR TIME DELAY
POWER BEFORE SERVICING.
FAILURE TO DO SO CAN RESULT
ELECTRICAL SHOCK CAN RESULT
ELECTRIC POWER SUPPLY OR
BRIGHT YELLOW
NAMEPLATE LISTING.
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
Suction
(Low)
Discharge
(High)