Winter Freeze Protection - Trane AquaStream CGWN 205 Installation Operation & Maintenance

CG-SVX06D-E4
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 19 - 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.
2
2 0 3 0 4 0
% Ethylene glycol
1
5 0 6 0
33