Winter Freeze Protection - Trane CGWH 115 Installation Operation & Maintenance

10
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:
• Electrical heater mounted on all
water piping exposed to negative
temperatures.
• Start chilled water pump
during negative ambient air
temperature.
• Add ethylene glycol in the chilled
water.
• Drain water-circuit, however be
aware of corrosion process when
drained.
Figure 5 - 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
freezeup 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 (CGWH). CCUH is protected
against refrigeration migration by a
liquid solenoid valve.
Recommended ethylene and
propylene glycol percentage are
indicated in the General Start-up
section.
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
1
5 0 6 0
CGWH-SVX01D-E4