Cetetherm AquaEfficiency
Installation, service and operating instruction
59
18.1 Clean the plate heat exchangers (P-series)
To avoid injuries, protective gloves and glasses should always be worn when handling plates and
protective sheets.
DO NOT USE
hydrochloric acid or any acid that could corrode stainless steel plates.
DO NOT USE
water with more than 330 ppm Cl when making a cleaning solution.
Nitric (for calcium carbonate), sulfamic (for calcium sulphate) or citric (for silt) acids can be used.
Concentration should not exceed 4% at 60°C.
Carefully rinse the plates with clean water after cleaning.
1. Isolate the primary and secondary hydraulic circuits.
2. Open the drain valve to drop the internal pressure of each sides.
3. Measure the tightening lengths of the exchanger (distance between two frames plates),
4. Open the exchanger by loosening and removing the support anchor bolts,
5. Remove the plates without damaging the gaskets and readjusting their orientation and position.
6. Clean the plates, being careful not to damage them. Do not use metal implements
– use a metal-free
nylon brush or solution of dilute acid in accordance with PHE plate general cleaning instructions.
7. Lime scale can be removed by soaking the plates in a correctly-dosed acid solution
8. Refit the plates in the same order and position, as when they were disassembled.
9. Tighten up the exchanger, using the tightening length as initially.
10. Make sure the thermometer pocket of the control sensor is also cleaned properly.
Ask the local Cetetherm Company for more information on maintenance procedures, disassembly, cleaning,
remounting.
Plates’ package thickness PHE in between frames
.
N type
thickness
13
17
27
37
45
69
97
(mm)
34
44
69
94
114
174
244
18.2 Clean the fusion-bonded or copper brazes plate heat exchangers (F/B-series)
Be sure the heat exchanger has been isolated, using primary and secondary closing valves
Only the specially designed, pre-fitted cleaning kit and compatible agents should be used for
cleaning fusion-bonded or soldered plate heat exchangers.
Protective gloves and glasses should always be worn while these operations
.
