Herz H7990-08 Series Manual

HERZ H7990-08 Series Thermostat
H7990
Series thermostats are available for individual room temperature control
in residential, industrial and business premises. Suitable for 2-pipe or 4-pipe Fan Coil
configuration.
H7990
adopt digital control technology with large LCD display, It shows the
following items: working states (cool, heat or ventilation), the speed of fan coil, room
temperature, set-point. There are following keys on the panel: On/Off " ", Exchange
mode (cool, heat or ventilation) " ", Select fan speed (high, medium, low or auto) " ",
set-point temperature "" and "".
MODEL DENOMINATIONS
H7990 08
–
Y: Control damper to open or close.
DA/DA2: Control Motorized Valve (DA: Control 2-wire N.C. FCU valve; DA2: Control 3-wire FCU valve) and 3-speed
fan; When the temperature reaches the set-point, it will close the Motorized Valve with the fan still running.
DB/DB2: Control Motorized Valve (DB: Control 2-wire N.C. FCU valve; DB2: Control 3-wire FCU valve) and 3-speed
fan; When the temperature reaches the set-point, it will close the Motorized Valve and Fan both.
FCV2: Control 4 pipe fan coil units, Control two Motorized Valves and 3-speed fan, when the temperature reaches
the set-point, it will close the Motorized Valves with the fan still running.

BASIC FEATURES

 Room temperature setting
 Manual or Auto 3-speed changeover
 Defrost (low temperature protection)
 IR remote control (Option)
 Blue Backlight (Option)

SPECIFICATIONS

 Sensing element:
 Accuracy :
 Set-point range:
 Display range:
 Operation environment: 0～45℃
 Operating Humidity:
 Power supply:
 Switch current rating: Resistive: 2A, Inductive: 1A

OPERATION

 On/Off: Press "
 Setting temperature: Press "" to reduce set-point, press "" to raise set-point, and 0.5℃ changed once.
 Mode Selection: Press "
icon will flash, and it will be confirmed automatically after 5 seconds. The ventilation function is invalid for
 Fan Speed Selection
or "Auto".
Under auto fan speed "Auto", the fan-speed will be changed automatically. Auto LOW-speed When the difference
HERZ Armaturen Gws.m.b.H
Richard-Strauss-Strasse 22,1230 Vienna, Austria.
R: IR remote function. Blank is invalid. (Remote controller should be ordered additionally)
L: Backlight available. Blank is invalid.
NTC
± 1℃
5℃ to 35℃
0～50℃
5～90%RH (non-condensing)
AC 85～260V, 50/60Hz
" to turn on, press " " again to turn off thermostat and its output.
" to change system working in cooling " ", heating " " or ventilation " " mode, the related
H7990 08
:Press "
" to change fan speed among "

STATUS DISPLAY

 Working Status: Cool
 Fan Speeds: Low
and Auto.

Room temperature display

Temperature setting display
 Rated Power:  2 W
 Wirings: Screw-in terminals, each terminal capable of
accepting 2 x 1.5 mm
 Housing: ABS + PC Flame Retardant
 Dimensions: 86 × 86 × 13 mm ( W × H × D )
 Hole pitch: 60 mm ( Standard )
 Protection Class: IP30
 Display: LCD
Data sheet for H7990 08, Issue 0916
, Heat
, Ventilation
, Medium
, High
2 2
or 1 x 2.5 mm wires
H7990 08.
(Hi)", " (Med)", "
(Low)"
1