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CO
2
Ventilation Control
HRVs can be controlled by a CO
2
controller that can be
connected to fan control Low–Com–High. As the CO
2
lev-
els exceed acceptable limits, the dry contact across High–
Com is closed, raising high speed fan ventilation.
Remote Fan Control
Remote fan control can be achieved by connecting dry
contact controls to the terminal interface at terminals
labeled: Low–Com–High. These controls could be the
following: SPDT switch, dehumidistat, CO
2
sensor, light
sensor, timer, building management system, etc. The illus-
tration below represents a switch connected to the unit.
JUMPER
CO
2
SENSOR
AC INPUT
AC GROUND
NC NO
1
2
3
4
5
6
7
8
9
10
1
8
2
3
4
5
6
7
8
9
10
NOTE 1: Terminal 5 (left side) on
CO
2
sensor used only with
two-speed units.
NOTE 2: Terminal 7 and 8 (left side)
on CO
2
sensor used only with
blower VFDs.
NORMAL OPERATION – LOW SPEED
CO
2
LEVELS EXCEED SETPOINT – HIGH SPEED
7
6
5
3
2
1
2
1
4
WALL CONTROL
CLASS 2 VOLTAGE
BLACK
OCCUPIED
TIMER/
SENSOR
FAN
INTERLOCK
CONTACT
LOW
COMMON
HIGH
RED
GREEN
YELLOW
NOTE:
Connections are all dry
contacts except wall control
and 24 VAC power supply.
Use of 24 VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Figure F3: CO
2
ventilation control
JUMPER
REMOTE FAN SWITCH
LOW HIGH
WALL CONTROL
CLASS 2 VOLTAGE
BLACK
OCCUPIED
TIMER/
SENSOR
FAN
INTERLOCK
CONTACT
LOW
COMMON
HIGH
RED
GREEN
YELLOW
NOTE:
Connections are all dry
contacts except wall control
and 24 VAC power supply.
Use of 24 VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
Figure F4: Remote fan control
CAUTION
Do not use a wall control and remote fan switch at the
same time. Damage to the unit may occur.
VCES-HRV-IOM-1C – HRV600i, HRV700i, HRV1200i
27
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