ARI Armaturen Liquid PN25 EN - Manual (Page 9)

Rev. 0040807002 0405 Page 9
Operating and installation instructions
Liquid return temperature limiter
7.3 Tightening torques
(refer to Fig. 1 page 4 - Fig. 4 page 8)
8.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and
adjustment work has been carried out and completed in accordance with these Operating
Instructions.
If malfunctions cannot be eliminate with the help of the following table
“9.0 Troubleshooting table”, the supplier or manufacturer should be consulted.
9.0 Troubleshooting table
Pos.
Liquid return temperature
limiter PN25/40
Torque (Nm)
6 Screw cap 100
24 Controller 80
43 Plug 70
47 Thermometer adapter 50
48 Thermometer 50
-
ATTENTION !
- It is essential that the safety regulations are observed when identifying faults.
ATTENTION !
- refer to item 10.0 and 11.0 prior to dismantling and repair work!
- refer to item 6.0 before restarting the plant !
Fault Possible cause Corrective measures
No flow Installed in wrong flow direction. Fit valve in direction of flow arrow.
Note installation position
Flange covers not removed Remove flange covers
Little flow Piping system clogged Check piping system
Changed upstream pressure or back
pressure operating conditions Correct selection according to flow
diagram
No closure, or internal
leakage Controller clogged Clean controller; refer to item 7.1
Controller worn out Change controller; refer to item 7.1
Controller shifted / misadjustedt Check adjustment; refer to item 5.3
Controller incorrectly screwed into body Check seal face between body and con-
troller, tighten controller correctly;
refer to item 7.3
Controller operated above safe operating
pressure Observe operating limits as per data
sheet
External leakage Screw cap (Pos. 6) not properly
tightened Tighten; refer to item 7.3
Plug (Pos. 43) not properly tightened Tighten; refer to item 7.3