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20
Installation
Winter freeze protection
During negative ambient air
temperature chilled water piping
must be fully insulated. Ensure that
all safeties are taken to prevent frost
damage during negative ambient air
temperature. The following systems
can be used:
1. Electrical heater mounted on all
water piping exposed to negative
temperatures.
2. Start chilled water pump during
negative ambient air temperature.
3. Add ethylene glycol in the chilled
water.
4. Drain water-circuit, however be
aware of corrosion process when
drained.
Note
If machinery room can be exposed to
temperature below 0°C, systems 2,
3 and 4 must be used.
Figure 7 - Freezing point versus ethylene glycol percentage
0
-1 0
-2 0
-3 0
3
-4 0
-5 0
0
1 0
1. Liquid
2. Freezing without burst effect
3. Freezing with burst effect
CAUTION:
- There is a risk of freeze-up of
the evaporator circuit due to
internal refrigerant migration if the
condenser circuit is maintained at a
low temperature (below 0°C) for a
long period during the cold season.
If necessary, provide isolation valves
on the condenser water circuit
(CGWN). CCUN is protected against
refrigeration migration by a liquid
solenoid valve.
- When using the freeze protection
by pump activation during the cold
season, water must be able to
circulate freely.
Check that no closure valve on
other device might block waterflow.
Loading concentrated glycol in the
water loop at the suction side of the
pump is prohibited. It can severely
damage the mechanical seal of the
pump and consequently generate
potential water leaks.
2
2 0
3 0
4 0
% Ethylene glycol
1
5 0
6 0
CG-SVX06F-GB
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