Subject to change without prior notice Revised 03-11
6 720 220 047
6
TW Series / Water to Water
used due to high pressure drop and poor throttling
characteristics.
Never exceed the recommended water ow rates.
Serious damage or erosion of the water to
refrigerant heat exchanger could occur.
Improper heat exchanger uid ow due to piping,
valving or improper pump operation is hazardous
to the unit and constitutes abuse which will void
the heat exchanger and compressor warranty.
Always check carefully for water leaks and repair
appropriately. Units are equipped with female pipe
thread ttings. Consult the specication sheets for
sizes. Thread sealant should be used when
connecting water piping connections to the units to
insure against leaks and possible heat exchanger
fouling. Do not overtighten the connections.
Flexible hoses should be used between the unit and
the rigid system to avoid possible vibration. Ball
valves should be installed in the supply and return
lines for unit isolation and unit ow balancing.
COOLING TOWER / BOILER
APPLICATION (Figure #1)
To assure adequate cooling and heating
performance, the cooling tower and boiler uid
loop temperature should be maintained between
50° F to 100° F. In the cooling mode, heat is
rejected from the unit into the condenser water
loop. A cooling tower provides evaporative cooling
to the loop water; thus, maintaining a constant
supply temperature to the unit. When utilizing an
open cooling tower, chemical water treatment is
mandatory to ensure the water is free of corrosive
materials. A secondary heat exchanger (plate frame
between the unit and the open cooling tower) may
also be used. It is imperative that all air is
eliminated from the closed loop side of the heat
exchanger to prevent condenser fouling.
In the heating mode, heat is absorbed from the
condenser water loop to the unit. A boiler can be
utilized to maintain the loop within the proper
temperature range. In milder climates a “ooded
tower” concept is often used. This concept involves
adding make-up water to the cooling tower sump to
maintain the desired loop temperature. No unit
should be connected to the supply or return piping
until the water system has been completely cleaned
and ushed to remove any dirt, piping chips or
other foreign material. Supply and return hoses
should be connected together during this process
to ensure the entire system is properly ushed.
After the cleaning and ushing has taken place, the
unit may be connected to the water loop and should
have all valves wide open.
Pressure/temperature ports are recommended in
both the supply and return lines for system ow
balancing. Water ow can be accurately set by
measuring the refrigerant-to-water heat exchangers
Cooling Tower / Boiler Application
WELL WATER APPLICATION (SOURCE SIDE)
1. PRESSURE TANK
2. BALL VALVES
3. SOLENOID VALVE (SLOW CLOSING)
4. HOSE KIT
5. P/T KIT
6. LOAD SIDE CONNECTIONS*
7. LOW VOLTAGE CONTROL CONNECTION*
8. VIBRATION PAD
9. LINE VOLTAGE DISCONNECT
Figure #2
* NOTE: Water and electrical connection locations vary
depending on model. Connect as required per unit labels.
(8 pages)
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