HERZ H7711 Digital Thermostat
Introduction
H7711 series thermostats are used to control room temperature in industrial, commercial, and residential environments via controlling electric modulating valve with 0-10VDC (4-20mA) control signal or floating control as well as damper actuator of VAV system. The electronic control technology is adopted, with a green backlit LCD display of working mode
; fan speed
; room temperature; setting temperature, etc. push buttons: On/Off
; mode changeover
; fan speed choose
, and temperature adjustment
. Shell: PC + ABS retardant material.
Function:
- Detect and Display room temperature
- Room temperature setting
- Fahrenheit or Celsius degree display
- Timing sleep
- Control On/Off of cooling and heating equipment
- Selectable single-speed or three-speed fan control
Order Guide
|
Model |
Output signal | Fan
(Single/3-speed) |
RS485
Network |
Input
Control |
Remote
Sensor |
|
| Floating | Modulation | |||||
| H7711A | Cooling/Heating | √ | √ | |||
| H7711AN | Cooling/Heating | √ | √ | √ | ||
| H7711B | Cooling/Heating | √ | √ | |||
| H7711BN | Cooling/Heating | √ | √ | √ | ||
| H7711C | Cooling/Heating | √ | √ | √ | ||
| H7711CN | Cooling/Heating | √ | √ | √ | √ | |
| H7711D | Cooling/Heating | √ | √ | √ | ||
| H7711DN | Cooling/Heating | √ | √ | √ | √ | |
| H7711E | Cooling | Heating | √ | √ | √ | |
| H7711EN | Cooling | Heating | √ | √ | √ | √ |
| H7711F | Heating | Cooling | √ | √ | √ | |
| H7711FN | Heating | Cooling | √ | √ | √ | √ |
| H7711I | Cooling&Heating | √ | √ | √ | ||
| H7711IN | Cooling&Heating | √ | √ | √ | √ | |
| H7711K | Cooling&Heating | √ | √ | √ | ||
| H7711N | Cooling&Heating | √ | √ | √ | √ | |
Specification
- Set temperature range: 0 – 99.5℃ adjustable
- Accuracy displayed: 0.1℃
- Accuracy: ±0.5℃
- Rated Power: 1 W
- Sensor type: NTC
- Display: LCD
- Power: AC 24V±10％, 50Hz/60Hz
- Output signal: AC 24V×2 (0.5A resistive) , 0 – 10VDC(5mA) / 4 – 20mA (600Ω)
- Input signal: dry contact (NO)
- Dimensions: 86×86×23mm (W×H×D)
- Fixing screw width: 60mm (Standard)
Operations
- On/Off: Press the buttons to turn on; press again to turn off.
- Setpoint: With the thermostat on, press
to reduce the setpoint, and press
to increase the setpoint, the setpoint step is 0.5℃, the setpoint will be confirmed automatically after 5 seconds, and then return to display status, press to check setpoint. - Mode: With the thermostat on, press to change the working mode –
( Auto is available from H7711E to H7711K). - Fan Speed: With the thermostat on, press to select the desired speed –
. If a single-speed fan is available, there’s only med speed
. Under auto speed fan, the fan speed will be changed automatically as below: in low speed when the room temperature is 1℃ different from the setpoint; in med speed when the room temperature is 2℃ different from the setpoint; in High speed when the room temperature is 3℃ difference with a setpoint. - Sleep: The thermostat will get into sleep function after programming. The set Temperature should be.
- To set: Press the button for 3 seconds till
display, there’s a number of count down in the center of the LCD, Use it to adjust the desired sleep time: the max. = 48 hours; the thermostat will return to the working status after 5 seconds, flashing to start counting down. The setpoint should be replaced by the sleep setpoint. To quit: When the thermostat gets into the Sleep function, “will flash, press “or ” to quit. - Keypad lock press for 10 seconds till to
display activates, under this function, any keypad is locked. Press for 10 seconds till disappears to quit the function. - Set Parameters: With the thermostat off, press for 10 seconds to enter the menu to set the parameters
Parameter table
| Parameter | Description | Default | Range | Step |
| 1 | Power on status (0: Off; 1: On; 2: Hold) | 2 | 0 – 2 | |
| 2 | Fan speed (0: Single Speed; 1: Three Speed) | 1 | 0 – 1 | |
| 3 | Fan mode (DA; DB) | 0 | ||
| 4 | Sensor selection (0: Internal; 1: Remote) | 1 | 0 – 1 | |
| 5 | Temperature format (0: Celsius; 1: Fahrenheit) | 0 | 0 – 1 | 0.1 |
| 6 | Temperature calibration | 0 | -20.0 – ﹢20.0 | 0.1 |
| 7 | Minimum setpoint | 5℃/41℉ | 0 – 99.5 | 0.5 |
| 8 | Maximum setpoint | 35℃/96 | 0 – 99.5 | 0.5 |
| 9 | Dead band (from 7711E to 7711K) | 2 | 0 – 10 | 0.5 |
| 10 | Heating & Auto sleep setpoint | 7℃/45℉ | 0 – 99.5 | 0.5 |
| 11 | Cooling sleep setpoint | 28℃/82 | 0 – 99.5 | 0.5 |
| 12 | Comms# (7711XN) | 1 | 1 – 32 | 1 |
|
13 |
Input Signal Mode 0: Invalid
1: Changeover(from 7711A to 7711D) 2: thermostat will be sleep without input signal 3: thermostat will be Off without input signal |
0 |
0 – 3 |
|
| 14 | Heating reset time | 90 sec. | 10 – 300 sec. | 10 sec. |
| 15 | Cooling reset time | 90 sec. | 10 – 300 sec. | 10 sec. |
| 16 | Ports mode (0: Modulation & Floating; 1: On/Off) | 0 | 0 – 1 | |
| 17 | Valve status as turn off (0: Close; 1:Hold; 2: Open ) | 0 | 0 – 2 | |
| 18 | Port1 Modulation direction(0:10V Open; 1:10V Close) | 0 | 0 – 1 | |
| 19 | Port1 Modulation minimum signal | 0Bit | 0-128Bit(5V/10mA) | 0.04V/Bit(0.08mA/Bit) |
| 20 | Port1 Modulation proportional | 2 | 1 – 20 | 0.5 |
| 21 | Port2 Modulation direction(0:10V Open;1:10V Close) | 0 | 0 – 1 | |
| 22 | Port2 Modulation minimum Signal | 0 Bit | 0-128Bit(5V/10mA) | 0.04V/Bit(0.08mA/Bit) |
| 23 | Port2 Modulation proportional | 2 | 1 – 20 | 0.5 |
| 24 | Port1 Floating minimum time | 1 sec. | 1 – 9 sec. | 1 sec. |
| 25 | Port1 Floating maximum time | 30 sec. | 10 – 300 sec. | 10 sec. |
| 26 | Port1 Floating minimum time | 1 sec. | 1-9 sec. | 1 sec. |
| 27 | Port1 Floating maximum time | 30 sec. | 10 – 300 sec. | 10 sec. |
| 28 | Disable / Enable bypass PID control ( 0: Disable; 1: Enable ) |
0 |
0 – 1 |
|
| 29 | Override output value when bypass PID control
Display output value when enable PID control |
0 – 255 |
||
| 30 | Override output value when bypass PID control Display output value when enable PID control |
0 – 255 |
||
| 31 | Input signal management: 0: Input valid
1: Override Input: open 2: Override Input: close |
0 |
0 – 2 |
|
| 32 | Display room temperature or set-point 0: Room temperature 1: Set-Point |
0 |
0 – 1 |
|
| 33 | Configuration external sensor
0: B = 3950; 1: B = 3450; 2: B = 3900 3: User define (via network. default B = 3950) |
0 |
0 – 3 |
|
| 34-38 | N/A | |||
| 39 | Start temperature of Low temperature protection | 5℃/42℉ | 0-15℃/42-62℉ | 1℃/2℉ |
| 40 | Stop temperature of Low temperature protection | 7℃/46℉ | 2-17℃/46-66℉ | 1℃/2℉ |
Switch: There is a 5 poles switch on PCB. The meaning is below:
| Location | ON | OFF |
| 1 | 120 ohm Resistance between AB wires | No Resistance between AB wires |
| 2 | Port 1 Modulation 0 – 20mA | Off |
| 3 | Port 1 Modulation 0 – 10VDC | Off |
| 4 | Port 2 Modulation 0 – 20mA | Off |
| 5 | Port 3 Modulation 0 – 10VDC | Off |
Mounting
Wiring diagram
Note: Be sure to connect all the wires as per the wiring diagrams and keep it away from water, mud and other material so as to prevent the unit being spoiled!
All specifications and information within this document are reflecting the information available at the time of going to print and are meant for informational purposes only. Herz Armaturen reserves the right to modify and change products as well as its technical specifications and/or function according to technological progress and requirements. All diagrams are indicative in nature and do not to be complete. It is understood that all images of Herz products are symbolic representations and therefore may visually differ from the actual product. Colors may differ due to the printing technology used. In case of any further questions don’t hesitate to contact your closest HERZ Branch-Office.
HERZ Armaturen Ges.m.b.H.
A-1230 Wien, Richard-Strauss-Strasse 22, A-1230 Vienna, Austria.
REFERENCE:
DOWNLOAD MANUALS:
HERZ H7711 Digital Thermostat PRODUCT SPECIFICATION SHEET
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