Manual 2100-764
Page
5 of 8
4. Energize ventilator and adjust OCC potentiometer
to open the blade to the desired position on the
QCRV-4 (see Figure 1 on page 3). Label on right
side of QCRV indicates the A, B, C, D and E
positions. Remove filter for better viewing.
5. Program thermostat, CS2000A or DDC control
system to turn on ventilator during occupied
periods only.
CRV Board Sequence of Operation
The “V” Ventilation option includes a control board with
blade positioning potentiometers along with an input
for a 2-10V input signal (see Figure 3).
Adjustable potentiometers:
“PP” Potentiometer setting:
This potentiometer can be
used to adjust the blade setting for outdoor air intake
during a pre-purge cycle. The pre-purge cycle time is
based on the setting of the pre-purge timer. The pre-
purge time can be set to 0, 30, 60 or 90 minutes using
the PP jumper on the CRV control board. The pre-purge
function is triggered when the "3" terminal on the low
voltage terminal strip is energized, indicating occupancy.
Once the selected time has passed, the blade will move
to the position set by the "OCC" potentiometer.
“OCC” Potentiometer setting:
This potentiometer can
be used to adjust the blade setting for outdoor air
intake when the "3" terminal is energized on the low
voltage terminal strip indicating occupancy. The control
board will energize the occupied setting after the pre-
purge cycle or immediately if pre-purge jumper is set to
the "0" position.
MIS-4362 A
WHEN Y2 IS ENERGIZED
Y1 WILL OVERRIDE OCC
30
SETTING FOR 2ND STAGE
60
90
TURN OFF FOR C02
COOLING OR BLADE POSITION
FULL MODULATION
PRE-PURGE
TIMER
POT "Y1" SETTING FOR
STAGE ONE COOLING
POT "OCC" OCCUPIED SETTING
POT "PP" PRE-PURGE
SET FOR PREOCCUPANCY
0
POT "Y1" SETTING --
NOT APPLICABLE ON
THIS MODEL
POT "Y2" SETTING --
NOT APPLICABLE ON
THIS MODEL
POT "OCC" OCCUPIED SETTING
-- TURN OFF FOR CO2 FULL
MODULATION
PRE-PURGE TIMER
POT "PP" PRE-PURGE --
SET FOR PREOCCUPANCY
TABLE 1
QCRV-4 Ventilation Mode
Damper
Position
Duct-Free
Static Pressure
0.1
0.3
0.5
A
140
135
125
120
B
180
170
160
160
C
220
210
205
195
D
315
315
315
290
E
410
400
385
380
FIGURE 3
CRV Control Board
