Issue:
Swap inlet/outlet evaporator water connections
Resolution:
Evaporator Water Connections:
RTAA, RTUA, RTWA, RTWD, RTAC, CGA, CGAC, CGAF, CGWA, CGWB, CGWC, CCAA, CCAB,CCAC, CGWD, CCAD, CGWE, CGAD, CGAE, CCAE, CGWF, CCAF Chillers:
On a few occasions, contractors will ask if the inlet and outlet water connections to the evaporator can be swapped. As an example of this, they would like to connect the supply water to the inlet of the evaporator and the return water to the outlet of the evaporator.
This will cause nuisance machine trips in the field. It also can do serious damage to the machine. The machine relies on the entering evaporator water to be warmer, as this is the portion of the evaporator closest to the suction lines and compressors. This will help with the superheat of the refrigerant before the compressors see the refrigerant. Also, many of these machines have an internal flow protection that will trip when it sees the entering temperature two degrees colder than the leaving temperature.
RTHA, RTHB, RTHC, RTHD
Yes, the heads can be swapped from one end to the other. It is important not to rotate the heads when doing this. In other words, keep the 12 o'clock position the same after moving them from one end to the other. It will be a good idea to have new gaskets on hand when doing the swap.
RTWD, RTAC, RTAE, RTAF, ACR
The water connections cannot be swapped.
The water connection inlet/outlet cannot be reversed. Don't pipe incoming water piping into the outlet of evaporator.
Potential issues include impacts on charge requirements, performance, carryover, and oil return.
Notes:
Inlet and outlet locations are called out in the drawings exportable; from TOPSS.
Changes:
Other Question/Problem/Cause Statements:
- Can I swap inlet and outlet on the evaporator?
- Can I swap the evaporator heads from one end to the other.
- Can the water boxes be swapped end-to-end?
- Can the entering and leaving water connections be swapped from one end of the evaporator to the other?
- Switching Evaporator Heads
- Can I switch the water connections?
Facts:
- Screw and Scroll Chillers Chilled Water Connections
- Reference Library
Document Identifier: DOC-77192
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.