Fault
Measures
Consumption
appliance on fault
After depressurising the system,
connect the "Müller test unit" to the
appropriate test connections on the
regulator and take measurements:
•
inlet pressure (upstream
pressure before the
controller stage)
•
outlet pressure (idle
pressure, consuming device
not in operation
•
outlet pressure (flow
pressure, consumer unit in
operation)
•
connection pressure at the
consumer unit
Then compare the values with the
technical data of the regulator and
the consumer unit.
NOTE!
Before carrying out assembly and repair work,
please observe Section 10
9. Repairs
In order to ensure the proper functioning of the installation
under normal operating conditions, it is recommended to
replace the device before 10 years have elapsed since the
date of manufacture.
The 10 years is a recommendation that can be replaced by
national laws or technical regulators, taking into account the
operating conditions of integrated safety devices and
maintenance schedules.
According to DGUV 79:
The Contractor must ensure that parts of consumable
equipment that are subject to wear and aging are replaced
after a maximum of 8 years. This does not apply if the proper
condition has been confirmed by an expert.
10. Warranty
The scope and period of warranty is defined in the version of
the "General Terms and Conditions" of Müller Gastechnik
GmbH valid at the time of delivery.
All information and notes in this manual have been compiled
taking into account the applicable standards and regulations,
the state of the art and our many years of expertise and
experience. The manufacturer accepts no liability for
damages due to:
•
Non-compliance with the instructions
•
Unintended use
•
Use of untrained personnel
•
Unauthorised conversion
•
Technical changes
•
Use of non-approved spare parts. The actual scope
of delivery may differ from the explanations and
illustrations described here in the case of special
versions, the use of additional ordering options or
due to the latest technical changes.
11. Drawing (NDR320/520)
1. inlet connection G 1/2“ IG
2. vent OPSO (SAV)
3. overpressure safety shut-off device OPSO (SAV)
4. display OPSO
5. exhaust vent regulator
(Connection for insect screen) Internal overpressure
safety relief valve. NDR-520 AD without PRV but with
safety diaphragm.
6. low pressure regulator 2
nd
stage
7. outlet connection G 1/2" IG
8. test device back pressure, 8mm hose connection of
"Müller-Prüfgerät"
9. test device inlet pressure G 1/4"
10. test device back pressure, connection G 1/8”
12. Technical Specification (NDR-320)
Max. permissible
pressure:
PS 4
Response
pressure
OPSO:
132
mbar
Nominal flow
Mg:
24 kg/h
Response
pressure PRV:
150
mbar
Inlet pressure
p:
0,5-4 bar
Connection at
inlet
G 1/2”
Nominal outlet
pressure pd:
50 mbar
Connection at
outlet:
G 1/2”
Pressure loss:
ΔP 5
Temperature
range
-40 °C
to
+80 °C
13. Technical Specification (NDR-520)
Max. permissible
pressure:
PS 4
Response
pressure
OPSO:
132
mbar
Nominal flow
Mg:
12 kg/h
Connection at
inlet
G 1/2”
Inlet pressure
p:
0,5-4 bar
Connection at
outlet:
G 1/2”
Nominal outlet
pressure pd:
50 mbar
Temperature
range
-40 °C
to
+80 °C
Pressure loss:
ΔP 5
