Flowserve NRS 1-50 For TWO Electrodes - Manual (Page 23)

3
Emergency operation
Emergency operation for water level limiter
If the level switch NRS -50 works with two level electrodes NRG ...-50 (water level limiter to TRD
604, EN 95-07, EN 953-06), the installation can continue operating in emergency operation
mode according to TRD 40 and EN 95 and EN 953 under constant supervision with only 1 level
electrode, in case that one of the two installed level electrodes fails.
If only one electrode is used for operation change the settings as follows:
n
Switch off mains voltage.
n
Unscrew the right and left fixing screws 3 and remove the lower terminal strip 2 , Fig. 6
n
Depending on which electrode shall be deactivated, set S or S of code switches 4 and 5 to ON.
n
Attach lower terminal strip and fasten fixing screws.
n
Apply mains voltage, equipment is re-started.
Attention
n
Record the beginning of emergency operation in the boiler log.
n
An installation operating in emergency mode has to be constantly supervised.
n
Immediately replace faulty level electrode.
n
Record the end of emergency operation in the boiler log.
n
When the emergency operation is over, restore original settings.
Code switch 4 Code switch 5
S  S  S  S 
Level electrode  activated OFF OFF
Level electrode  deactivated ON ON
Level electrode  activated OFF OFF
Level electrode  deactivated ON ON
4
Toggle switch, white
5
Toggle switch, white
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.