Bard WGSCRVS-3C, Installation Instructions Manual

Page: 10 / 17

Manual 2100-757
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
TURN OFF FOR C02
FULL MODULATION
Y1 WILL OVERRIDE OCC
TIMER
PRE-PURGE
POT "Y1" SETTING FOR
STAGE ONE COOLING
COOLING OR BLADE POSITION
WHEN Y2 IS ENERGIZED
SETTING FOR 2ND STAGE
POT "OCC" OCCUPIED SETTING
POT "PP" PRE-PURGE
SET FOR PREOCCUPANCY