Oppermann Regelgeräte JVA Manual

Frost protection system JVA/JVS
Sensor
*Factory setting
S1
TE 1000
S2
* Pt 1000
S3 Ni 1000-LG
S1 on, S4 off = TE2000
Range setting possible with jumpers.
Jumpers S1 – S3 are located directly behind the front panel,
which is removed from the front.
Jumper S4 is located on the mother board next to the terminal
block.
Technical Data
Power supply:
Power rating:
Alarm setpoint:
Output:
Controller input:
Sensor input:
Starting point of
restriction:
3 °C > alarm
Rate of increase (P range): 2 °C fixed
Sensor range
for warming:
Blower relay
contact load:
Alarm for DDC input:
Ambient temperature:
Dimensions:
JVA JVS
24 V AC/DC
2 VA
0 – +16 °C
0 – +10 V
0 – +10 V
NI 1000 LG
3 – 16 °C
1 – 8 °C
– 0 – 50 °C
6 A, 230 V
1 A, 60 V
0 – 40 °C
53 x 90 x 61 mm (L x W x D)
Temperature and humidity sensors | Data sheet No. 20670 | Version 04-2014 | 1 | 4
•
2-phase freeze protection - analog / digital
•
Control unit in the control panel
•
Average sensor TA-NI1000LG-I-... / TA-PT1000-I-...
or insertion sensor T-NI1000LG-I-... / T-PT1000-I-...
connectible
•
Warming and startup circuit for type JVS
•
Independent of controller manufacturer
•
Temperature-output signal 0 – 10 V
•
On short circuit or broken cable →
frost protection status
Applications
The 2-phase frost protection controller is an electronic monitor
for heating registers in ventilation systems to prevent freezing
at low outside temperatures.
Function
When a temperature behind the heating register or the return
flow water drops below a threshold, the control valve (0 – 10 V)
opens as a first sequence (the green „Restriction" LED blinks). If
the temperature continues to decline, the second sequence of
the relay switches the blower off (in hardware circuit). The red
LED lights up and the control unit is locked. Reset is only pos-
sible by pressing the internal reset button or by briefly cutting
power. An additional relay contact signals „Risk of Freezing" to
the automation station.
A second potentiometer on type JVS is used to set the warming
temperature to 0 – 50 °C if the blower is switched off. This is also
advantageous when restarting in cold outside temperatures
(startup circuit).
Attention!
The control unit triggers a freeze alarm if the temperature
sensor has a defect, on short circuit or a broken cable: Valve
open – locking – message to DDC. The blower is switched off
during a power outage - the control valve closes.