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TW Series Water to Water
APPLICATION CONSIDERATIONS
Well Water Systems
Copper is adequate for ground water that is not high in
mineral content. Should your well driller express
concern regarding the quality of the well water available
or should any known hazards exist in your area, we
recommend proper testing to assure the well water
quality is suitable for use with water source equipment.
In conditions anticipating moderate scale formation or in
brackish water a cupro-nickel heat exchanger is
recommended. In well water applications water
pressure must always be maintained in the heat
[1] Pressure Tank
[2] Ball Valves
[3] Solenoid Valve
[4] Hose kit
[5]P/T Kit
[6] Load Side Connections
[7] Low Voltage Control Connection
[8] Vibration Pad
[9] Line Voltage Control Connection
Revised 02-16
exchanger. This can be accomplished with either control
valve or a bladder type expansion tank. When using a
single water well to supply both domestic water and the
heat pump care must be taken to insure that the well can
provide sufficient flow for both. In well water
applications a slow closing solenoid valve must be used
to prevent water hammer. Solenoid valves should be
connected across Y1 and C1 on the interface board for
all. Make sure that the VA draw of the valve does not
exceed the contact rating of the thermostat. (Figure #9)
Figure # 9 Example System Set-up
Cooling Tower/Boiler Systems
The cooling tower and boiler water loop temperature is
usually maintained between 50° F to 100 ° F to assure
adequate cooling and heating performance.
In the cooling mode, heat is rejected from the unit into
the water loop. A cooling tower provides evaporative
cooling to the loop water thus maintaining a constant
supply temperature to the unit. When utilizing open
cooling towers, chemical water treatment is mandatory
to ensure the water is free from corrosive elements. A
secondary heat exchanger (plate frame) between the
unit and the open cooling tower may also be used.
It is imperative that all air be eliminated from the closed
loop side of the heat exchanger to insure against fouling.
In the heating mode, heat is absorbed from the water
loop. A boiler can be utilized to maintain the loop at the
desired temperature.
Application Considerations | 13
6720220047 (2016/02)
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