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RLC-SVX023B-GB
Condenser Water Temperatures
With the model RTSF chiller, a condenser water control method is necessary only if the unit starts with entering
water temperatures below 13°C, or between 7°C and 13°C, when a temperature increase of 0.6°C per minute to 13°C
is not possible.
When the application requires startup temperatures below the prescribed minimums, a variety of options are
available. To control a 2-way or 3-way valve, Trane offers a Condenser Regulating Valve Control option for the
Tracer UC800 controls.
Condenser leaving water temperature must be 9°C higher that evaporator leaving water temperature within
2 minutes after start-up. A minimum of 14°C differential must be maintained afterwards.
The minimum acceptable refrigerant pressure differential between condenser and evaporator is 1.7 Bar. The chiller
control system will attempt to obtain and maintain this differential at startup, but for continuous operation a
design should maintain a 14°C differential from evaporator leaving water temperature to condenser leaving water
temperature.
CAUTION! In case of low evaporator leaving water temperature applications, the non use of glycol on the condenser
side may result in condenser plate freeze-up.
Condenser Water Regulation
The Condenser Head Pressure Control Option provides for a 0-10VDC (maximum range -a smaller range is
adjustable) output interface to the customer’s condenser water fl ow device. This option enables the Tracer UC800
controls to send a signal for opening and closing a 2-way or 3-way valve as necessary to maintain chiller differential
pressure.
Methods other than those shown can be employed to achieve the same results. Contact your local Trane offi ce for
details.
Contact the manufacturer of the cooling device for compatibilty with variable water fl ow.
Throttling valve (Figure 2)
This method maintains condensing pressure and temperature by throttling water fl ow leaving the condenser in
response to condenser pressure or system differential pressures.
Advantages:
• Good control with proper valve sizing at relatively low cost.
• Pumping cost can be reduced.
Disadvantages:
• Increased rate of fouling due to lower condenser water velocity.
• Requires pumps that can accommodate variable fl ow.
Figure 2
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Installation - Mechanical
