Lauda IN 550 XT FC Operation Manual page 129

Descaling the cooling water circuit
Fig. 81: Descaling
V4
Required equipment for descaling with a pump (drum pump):
a container with approx 20 liter volume
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a pump
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Hoses between container and pump and between pump and cooling
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water circuit
Hose between cooling water circuit and container
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Required equipment for descaling with a funnel:
Two containers with 10 to 20 liter volume
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A funnel
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Hose between funnel and cooling water circuit Place the funnel as high
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as possible, so that the device fills with descaler quickly.
Hose between cooling water circuit and container
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Protective equipment:
NOTICE!
Risk of refrigerant escaping from cooling water circuit
Device damage
Before performing cleaning work and decommissioning the

device, or if there is a risk of freezing, drain the cooling
water circuit of the cooling unit using compressed air or
an industrial vacuum cleaner (watertight). To avoid dam-
aging the valve membrane during cleaning, only blow com-
pressed air into the inflow connector while using an indus-
trial vacuum cleaner to vacuum only from the outflow
connector.
1. Switch the device into standby.
2. Press the Enter key to open the menu.
3.
Select the menu items  Fill mode  Water valve  open on the
operating unit.
The water valve opens.

4. Fill the device with descaler-water mixture via the hose on the cooling
water inlet.
5. Recirculate the descaler/water mixture or refill continuously.
6. Leave the descaler-water mixture to work (see table below).
7. Flush the device thoroughly with clean water (see table below).
8. Drain cooling water circuit Blow compressed air through the return
connector of the cooling water circuit.
Integral process thermostats with flow control unit
Safety glasses
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Protective gloves
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Protective work clothing
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