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Consult a qualified water treatment specialist to determine whether treatment is needed.
CAUTION - Proper Water Treatment!
The use of untreated or improperly treated water may result in scaling, erosion, corrosion, algae or
slime. It is recommended that the services of a qualified water treatment specialist be engaged to
determine what water treatment, if any, is required. Trane assumes no responsibility for equipment
failures which result from untreated or improperly treated water, or saline or brackish water.
Freeze Protection
For unit operation in a low enviroment temperature of 0°C or below, multiple measures for freeze protection
must be taken against freezing.
1.
Heaters are factory installed on water boxes, evaporator shell, partial heat recovery BPHE shell and water
pipes as well as insulations to protect the evaporator, PHR BPHE and water pipes from freezing damage in
low ambient temperature. Field- suppiled 230VAC single-phase power supply for heater should apply to local
and national codes.
2.
The UC800 control does not check the operation status of electrical heaters. Qualified technicians are
required to wire the electric heater power supply, inspect and confirm the status of electric heaters to avoid
catastrophic damage to evaporator or PHR BPHE.
3.
Field-supplied heater and insulation are necessary for external water piping, pumps, and other components
that may be damaged if exposed to freezing temperatures.
4.
Water pumps must be controlled by the UC800 to avoid evaporator tube from freezing by refrigerant
migration after unit stop. When no unit operation is possible and the pump is already off, UC800 anti-freeze
protection function will command the pump to ciculate water to avoid freezing in low ambient temperature
condition.
5.
Thoroughly drain the water from partial heat recovery water loop in winter.
CAUTION - Water pump Must be controlled by the UC800!
Water pump and heater operation combination can protect the evaporator down to low ambient
temperature when the power is available to all of pump, UC800 controller and heater. This option will
NOT protect the evaporator in the event of power failure to the unit unless backup power is supplied
to the necessary components.
CAUTION - Equipment Damage!
All inlet and outlet shutoff valves shown in
by UC800 controlled pump to avoid freezing when the units in operation or standby condition.
NOTICE - Equipment Damage!
The electrical heater of water side should be field-suppiled independent 230V single phase AC power
source.
NOTICE - Electrical heater of water side Damage!
Failure to connect power after filling water or remove power before draining will result in evaporator
immersion heater failure.
Evaporator water Bypass Valve Control Options
This option function for field-suppiled and installed valve is applicable to low temperature heating condition
when the actual leaving water temperature far below the set-point after unit heating for a long time. An
Figure 8
should be always open to enable water circulated
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