between room-temperature and set-point exceed 1
℃
, Auto MED-speed When exceed 2
℃
, Auto HI-speed When exceed 3
℃
.
Control Damper (
H7
990
Y): The damper will be open when (1) room temperature is higher than set-point in cooling;(2)
room temperature is lower than set-point in heating, Otherwise the damper will be closed.
Control Motorized Valve under 2-pipe configuration (
H7
990 08
DA/DB/DA2/DB2): If the difference between room
temperature and set-point exceed 1
℃
, FCU valve will be open; if room temperature and set-point are equal,
H7
990 08
DA/DA2
will close the FCU valve with the fan still running,
H7
990 08
DB/DB2 will close the FCU valve and Fan both.
Control FCU Valve under 4-pipe configuration (H
7
990 08
FCV2): In cooling, when the room temperature is higher than
set-point, the cooling Valve will be opened. Otherwise it will be closed. Heating valve is always closed. In heating, When the
room temperature is lower than set-point, the heating valve will be opened. Otherwise it will be closed. Cooling valve is always
closed.
DEFROST (LOW TEMPERATURE PROTECTION)
Description: when the thermostat turns off and the room temperature is lower than 5
˚
c, it will be turned on
automatically in heating mode with
“
” showing, under
H
7990 08
DA/DB/DA2/DB2/FCV2 models, the system will be in heat
mode and fan runs in high speed.
Under
H7
990 08
Y model, the motorized damper will be open. The thermostat will turn off
when room temperature is higher than 7
˚
c
Set low temperature protection: Turn off the thermostat, press
“ ” and “
” buttons simultaneously and hold for 3
seco
nds, it will display “00” or “01”, press “
” or “
” key to adjust. “00” indicates low temperature protection invalid, “01”
indicates low temperature protection function valid. The default is
“00”.
WIRING DIAGRAMS
MOUNTING
1. Open the main control
panel: put the screwdriver
(3.5mm) into the block
4mm along the bevel.
Prize up, open the clips.
2. Take off the wires.
3. As per wiring diagram,
connect it with terminals,
fixed by the screwdriver.
4.
Put the connected
thermostat onto the back
panel in the wall, then fix it
with the two screws in the
packing box.
5. Put the cover with 30
degree angle, then fix the
up two clips.
6. Push the places of the
two down clips, fix the
cover,
and
finish
the
installation.
H7
990
08
DA/DB
L
N
Val
Med
Low
Fan
Valve
AC85
～
260V 50/60Hz
N L
Hi
H7
990
08Y
N
L
Damper
VC
VO
AC85
～
260V 50/60Hz
N L
H7
990
08
DA2/DB2
L
N
VO
Med
Low
Fan
Valve
VC
AC85
～
260V 50/60Hz
N L
Hi
H7
990
08
FCV2
L
Cooling
N
Med
Low
Fan
Val 1
Val 2
Heating
AC85
～
260V 50/60Hz
N L
Hi
HERZ Armaturen Gws.m.b.H
Richard-Strauss-Strasse 22,1230 Vienna, Austria.
2
