104
A : Float ball
B : refrigerant exit
Fig 58
– Float ball valve details
9.3.9 Inspect Safety Relief Devices and Piping
Refer to chapter 1 “Safety considerations”. The relief valves on this chiller protect the system against the
potentially dangerous effects of overpressure. These devices must be kept in peak operating condition.
As a minimum, the following maintenance is required:
• At least once a year, disconnect the vent piping at the valve outlet and carefully inspect the valve body and
mechanism for any evidence of internal corrosion or rust, dirt, scale, leakage, etc.
• If corrosion or foreign material is found, do not attempt to repair or recondition. Replace the valve.
• If the chiller is installed in a corrosive atmosphere or the relief valves are vented into a corrosive atmosphere,
make valve inspections at more frequent intervals.
9.3.10 - Periodic check of the safety loop
Every 6 months, check the SRMCR safety loop.
The periodic tests are intended to verify the correct functioning of the following elements:
- Opening and setting of safety switches (HPS pressure switches).
- The good opening of the contactor K101 and its return of state. .
- The proper operation of the GateKill stop function.
9.3.10.1 Checking the adjustment of safety switches
Invert the direction of the three-way valve so that the two standby switches start the operation.
Remove the first pressure switches and have their controls checked by an approved body - see Annex C,
paragraph C6 of EN 378-2.
Lock the 3-way valve to prevent any mishandling.
Once the settings have been checked, reinstall the pressure switches on the three-way valve and invert the valve
again to allow the operation of the pressure switch again.
9.3.10.2 Checking the safety chain
The verification steps are described in the tables below.
Test n ° 1:
Steps
OK
NOK
Disconnect an active pressure switch by opening its disconnect terminal on TBS main
terminal
(SP1FA = S-11 ; SP1FB= S-12 ; SP2FA = S-21 ; SP2FB = S-22).
Na
2- Check that the OUT LED of the safety relay K4 goes out.
3- Check that the round tap of the K101 contactor is not depressed.
Check that the alarm corresponding to the opening of the Gate Kill input is present
Summary of Contents for PIC 5+
Page 26: ...26 VFD not shown Fig 13 Sensors actuators location ...
Page 52: ...52 Fig 24 19DV control box ...
Page 53: ...53 1 Power supply 24V AC 2 LEN 3 CCN 4 Ethernet 5 USB Fig 25 19DV HMI box rear view ...
Page 54: ...54 Fig 26 19DV IOB1 wiring Fig 27 19DV IOB2 wiring ...
Page 57: ...57 ...
Page 113: ...113 APPENDIX A SmartView SCREEN AND MENU STRUCTURE ...
Page 114: ...114 Detailed menu description ...
Page 116: ...116 APPENDIX B MAINTENANCE SUMMARY AND LOGSHEETS Cont 19DV monthly Maintenance Log ...
