8 Configuration
Installer and user reference guide
35
VAM350~2000J7VEB
Heat reclaim ventilation unit
4P487293-1 – 2017.08
Supply Fresh-up
(Excessive outdoor air supply)
Exhaust Fresh-up
(Excessive exhaust air supply)
Example
b
a
e
c
d
g
f
h
c
d
i
a
Portion of fresh-up operation
b
Air exhaust
c
Air supply
d
Heat reclaim ventilation unit (VAM)
e
Normal ventilation fan
f
Portion of exhaust operation
g
Air exhaust
h
Sick room
i
Floor area
If an external fan is connected to J1 and JC, take the following into
account:
▪ Setting 19(29)‑0‑03 MUST be set, otherwise the filter cleaning
indication will be displayed at the wrong time.
▪ Make sure that setting 18(28)‑8 is still set for number 01,
indicating fresh-up.
▪ With setting 18(28)‑7 you can choose if there is exhaust air or
supply air fresh-up and if the user interface indicates that fresh-up
is going on.
▪ The following table describes the unit's operation based on setting
1A‑0 and J1, JC:
Setting
Description of
setting (See
"8.2 List of
settings" on
page 24
)
"J1", "JC"
Normal open
"J1", "JC"
Normal closed
1A‑0‑01
Fresh-up
"OFF" (Factory
setting)
Normal
Fresh-up
1A‑0‑02
Fresh-up "ON"
Fresh-up
Fresh-up
The unit's fresh-up operation corresponds with the following fan
operation:
Type
Air supply Fresh-up
Exhaust Fresh-up
Ventilation
amount
Air supply
Exhaust
Air supply
Exhaust
Weak
High
Low
Low
High
Strong
Ultra high
High
High
Ultra high
8.5.3
About the external damper operation
Functions
Intake of outdoor air when the heat reclaim ventilation unit is off can
be prevented if an external damper is incorporated in the system.
The heat reclaim ventilation's main unit printed circuit board
operates the heat reclaim ventilation and provides a signal for the
external damper.
a
d
a
i
j
b
e
f
h
g
b
X24A
d
c
HRV
a
Air suction/discharge grille
b
External damper (field supply)
c
Inspection hole
d
Switch box
e
Heat insulator
f
Outdoor air (fresh air from outdoors)
g
Exhaust air (exhaust air to outdoors)
h
Round shape hood
i
Printed circuit board
j
Power source
The required setting changes for switchover to X24A output (see
below for details).
Essential wiring
See
"6.5.2 Opening the switch box" on page 16
.
X24A gives an output when the supply air or exhaust air fan is
running. Put setting 18(28)-3 for number 03 or 04.
8.5.4
About the carbon dioxide sensor
With the CO
2
(carbon dioxide) sensor installed, you can adjust the
ventilation volume in function of measured CO
2
concentration. The
measured concentration value is compared to programmed trigger
values. Make sure that ventilation mode and air flow rate are set to
automatic.
See
"8.2 List of settings" on page 24
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 and fixed control.
