VAM350~2000FC
Total Heat Exchanger
HRV (Heat Reclaim Ventilation)
4P415947-1A – 2017.08
Installation manual
20
Example of control wiring
System description
External Damper Operation (Field supply)
Explanation of Functions
Intake of outdoor air can be prevented when HRV is switched OFF if
this damper is incorporated in the system.
The HRV’s main unit PCB operates the HRV and provides a
signal for the external damper.
Required setting changes for switchover to X24A output (see
below for details)
Essential Wiring
Refer to
"Opening the switch box" on page 8
.
CO
2
sensor
With the CO
2
sensor installed the ventilation volume can be adjusted
in function of measured CO
2
concentration. The measured
concentration value is compared to programmed trigger values.
Make sure to have ventilation mode and air flow rate set to automatic.
Refer to
"List of Settings" on page 13
for the field setting overview.
Use setting 19(29)-9-05 to give control to the CO
2
sensor.
Use setting 19(29)-7 to shift the trigger values.
Use setting 18(28)-6 to switch between linear & fixed control.
Example
When measured 900 ppm in linear control, the unit runs 20 minutes
in H, next 10 minutes in L and after elapse judges again.
Essential wiring
Refer to
"Opening the switch box" on page 8
and to the installation
manual delivered with the optional CO
2
sensor.
The local setting by the remote
controller for the air conditioner
(Refer to
"List of Settings" on
page 13
)
"J1", "JC"
normal open
"J1", "JC"
normal close
Fresh-up "OFF" (Factory setting)
Normal
Fresh-up
Fresh-up "ON"
Fresh-up
Fresh-up
1
2
3
J1
JC
HRV
1
Connecting line can be extended
up to 50 m maximum
3
Printed circuit board
2
Fan (Field supply)
1
2
HRV
1
Local ventilating fan
2
Power supply
1
Air suction/discharge grille
6
OA (Fresh air from outdoors)
2
External damper (field supply)
7
EA (Exhaust air to outdoors)
3
Inspection hole
8
Round shape hood
4
Switch box
9
Print circuit board
5
Heat insulator
10
Power source
Linear control
Fixed control
Initialising
20 minutes in H
20 minutes in H
Measuring
every 5 minutes
every 20 minutes
Judgement
every 30 minutes
(average of 6
measurements)
every 20 minutes
Trigger value
Linear control (minutes)
Fixed control
CO
2
ppm
UH
H
L
mode A
mode B
1450
1300
1150
1000
850
700
550
400
30
UH
UH
20
10
UH
UH
10
20
H
H
30
H
H
20
10
H
L
10
20
L
L
30
L
L
30
L
stop
30
L
stop
