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Press

“ ”, the programmable temperature is flashing, “▲” or”▼” to set the programmable temperature. Press“ ”, repeat 

the above steps to set up the 2

4 periods of Monday. 

Week 

Period NO. 1 

Period NO. 2 

Period NO. 3 

Period NO. 4 

Starting Time/ 

Temperature 

Starting Time/ 

Temperature 

Starting Time/ 

Temperature 

Starting Time/ 

Temperature 

Mon 

7:00 

  25

 

8:00          25

 

18:00 

  25

 

21:00 

  25

 

Tue 

7:00 

  25

 

8:00 

  25

 

18:00 

  25

 

21:00 

  25

 

Wed 

7:00 

  25

 

8:00 

  25

 

18:00 

  25

 

21:00 

  25

 

Thu 

7:00 

  25

 

8:00 

  25

 

18:00 

  25

 

21:00 

  25

 

Fri 

7:00 

  25

 

8:00 

  25

 

18:00        25

 

21:00 

  25

 

Sat 

7:00 

  25

 

8:00 

  25

 

18:00 

  25

 

21:00 

  25

 

Sun 

7:00 

  25

 

8:00 

  25

 

18:00 

  25

 

21:00 

  25

 

Repeat the above steps to set for TUE, WED, THU, FRI, SAT, SUN. 

Keypad Lock Function 

Keypad Lock: its keypad would be automatically locked in 30 seconds in case that no one uses the thermostat, 

so as to prohibit other persons from operating the thermostat. 

 Keypad Unlock

Press“ ”for 5 seconds to unlock

In case that no one uses the thermostat, its keypad would be 

automatically locked in 30 seconds

.

 

Low Temperature Protection Function 

 Turn off: When the room temperature is lower than 5

, the thermostat would automatically turn on the fan and 

valve 

with “ ” showing, When the room temperature reaches to 7

, the thermostat will automatically close the output. 

Low Temperature Protection Setting 

  Turn  off: 

press” ”  and  hold  for  3  seconds,  it  will  display  “OF”  or  “ON”,  press  “▲”  or  “▼”button  to  adjust  the 

parameter

. “OF” indicates low temperature protection invalid, “ON”  indicates low temperature protection function valid. 

The default is “OF”. 

Temperature Adjustment 

In  case  that  the  user  wants  the  displayed  temperature  on  the  thermostat  higher  or  lower  than  the  real 

temperature(±5

), the following operations could be taken

 

 Turn off: press 

“▲” and “▼” at the same time for 3 seconds, it will display “XX 

not displaying the  working 

model

, press 

“▲”or “▼” to adjust the temperature value, it will be automatically confirmed after 6 seconds. 

Alarm 

 if the sensor has failure, 

the thermostat will close the fan and valve, displaying “E1” or “E2”. 

E1

Sensor in short circuit alarm 

E2

Sensor in open circuit alarm 

It displays 

“HI” when the temperature is higher than 55

, displaying “LO” when the temperature is lower than 

0°C

HERZ Armaturen Gws.m.b.H

Richard-Strauss-Strasse 22,1230 Vienna, Austria.

3

Summary of Contents for H7990 Series

Page 1: ...uto Restart Option STATUS DISPLAY Working Status Cooling Heating or Ventilation Fan Speeds low Mid High or Auto FCU valve status Room temperature display Temperature setting display Clock week display SPECIFICATIONS Sensing element NTC Control Accuracy 1 Set point range 5 to 35 Display range 0 55 Operation environment 0 45 Operating Humidity 5 90 RH non condensing Key Touch screen key soft touch k...

Page 2: ...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 CLOCK CALIBRATION T T74 Press M with four seconds till to display hh mm and hh flash press or to adjust hour press M mm flash press or to adjust minute Press M week flash press or to adjust Mon to Sun TIMER FUNCTION SETTING T Timer on off function Turn on or...

Page 3: ...tion Turn off When the room temperature is lower than 5 the thermostat would automatically turn on the fan and valve with showing When the room temperature reaches to 7 the thermostat will automatically close the output Low Temperature Protection Setting Turn off press and hold for 3 seconds it will display OF or ON press or button to adjust the parameter OF indicates low temperature protection in...

Page 4: ...o 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 Med Low H7990 25 L N Val Fan Valve AC85 260V 50 60Hz N L Hi Low H7990 27 L N VO Med Fan Valve VC AC85 260V 50 60Hz N L Hi Val2 Low H7990 26 L Cooling N Med Fan Val1 4 pipe L C...

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