Bard WGCRVS-3C, Installation Instructions Manual

Page: 10 / 17

Manual 2100-757B
Page 10 of 17
FIGURE 6
CRV Control Board
terminal 4 on 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 A 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 CO2 V IN on the
control board must be spliced with the white wire
ran to the damper motor (V OUT on control board).
During 2-10VDC operation with A energized and pre-
purge timed operation active, DC voltage signaling
occupancy from a source such as a CO
2
sensor will
increase ventilation amounts as needed.
MIS-4362 B
PRE-PURGE
POT "Y1" SETTING FOR
STAGE ONE COOLING
SETTING FOR 2ND STAGE
Y1 WILL OVERRIDE OCC
30
TURN OFF FOR C02
COOLING OR BLADE POSITION
90
WHEN Y2 IS ENERGIZED
FULL MODULATION
TIMER
60
POT "OCC" OCCUPIED SETTING
POT "PP" PRE-PURGE
SET FOR PREOCCUPANCY
0