190.210-IOM (SEP 21)
Page 11
LazerWeld II Plate Heat Exchanger
Operation
Operation
Starting the unit
During start-up, check that no visible leakages appear
from the plate pack, valves, or piping system.
NOTICE
If several pumps are included in the system, ensure
you know which one to activate first.
NOTICE
Make adjustments of flow rates slowly in order to
avoid the risk of pressure surge (water hammer).
Water hammer is a short-lasting pressure peak that
can appear during start-up, or shut-down of a sys-
tem, causing liquids to travel along a pipe as a wave
at the speed of sound. This can cause considerable
damage to the equipment.
NOTICE
Charging liquid ammonia into a refrigeration circuit
under vacuum results in low temperatures. Such
temperature levels might be lower than any elasto-
meric materials can seal against.
In applications where the field side is used for a two
-
phase refrigerant, for example cascade CO
2
/NH
3
ap-
plications, it is very important to fill the two-phase
refrigerant in gas phase. This to avoid temperature
chocks for the gaskets and to avoid temporary leak-
ages due to the natural fact that the metal is shrink-
ing very fast.
1. Before start-up, check that all tightening bolts are
firmly tightened and that the dimension A is correct.
See the following figure.
Figure 17: LZWII, dimension A
2. Check that the valve is closed between the pump and
the unit controlling the system flow rate.
Figure 18: Valve positions
3. If there is a valve at the exit, make sure it is fully open.
4. Open the air vent and start the pump.
Figure 19: Open the air vent
5. Open the valve slowly.
Figure 20: Open the valve to pump
Valve
Open
Closed
Open
