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  1. Heat Pump operating at low setting during summer

    What happens if you set the thermostat at 60 deg F during hot summer? Does the heat pump run until the temperature gets to 60 F? Is there a potential for indoor coil having frost on it?

    This is...
  2. Thread: Defrost Scheme

    by behmin
    Replies
    7
    Views
    644

    This is a pool heat pump only. So, heat is taken...

    This is a pool heat pump only. So, heat is taken from outside air and is pumped to the pool water. If the outside air is cold, then the evaporator is going to freeze up gradually depending on air...
  3. Thread: Defrost Scheme

    by behmin
    Replies
    7
    Views
    644

    There is no freeze protection and I need to heat...

    There is no freeze protection and I need to heat the water even if the ambient condition is low. In this case, the evap coil temp will be below freezing point and the air coil ices up, requiring...
  4. Thread: Defrost Scheme

    by behmin
    Replies
    7
    Views
    644

    Defrost Scheme

    Active defrost on water heat pumps. Which method is more economical/reliable

    Using a reversing valve to make evap into a condenser.
    Use hot gas bypass
  5. Thread: Heat Pump

    by behmin
    Replies
    2
    Views
    591

    Heat Pump

    What is the best defrost scheme for a packaged water heating heat pump. I have heard about using reversing valves to defrost. Can anybody explain the hot gas defrost? I am specifically interested...
  6. Replies
    2
    Views
    390

    Packaged Heat Pumps

    Anybody knows what components are required in a packaged heat pump system besides the main conventional components, Evap, cond, TXV, compressor, dryer, reversing valve?

    On residential heat pumps,...
  7. Replies
    8
    Views
    420

    What if using part of the discharge gas to run...

    What if using part of the discharge gas to run through an orifice and then attach it to the distributor intlet (after TXV, essentially putting hot gas back into the evaporator). This will raise the...
  8. Replies
    8
    Views
    420

    You know there is always some humidity. So, is...

    You know there is always some humidity. So, is there still a unit with no defrost at low temps 25-45F??
  9. Replies
    8
    Views
    420

    Heat Pump Design

    Anybody know of heat pumps working at low temperature wihtout having to go through defrost? By low temp I mean between 25-45 deg F.
  10. Thread: Hi-Pot Test

    by behmin
    Replies
    1
    Views
    757

    Hi-Pot Test

    Can anybody tell me under what condition, a packaged refrigeration system with scroll compressor, should be hi-pot tested? Can we do this with system chrged? It can be done without system charged...
  11. Replies
    1
    Views
    473

    Pressure Readings

    What does the pressures numbers on AC or Heat Pump units mean. For example they have the following on hteir nameplate.

    Low Pressure 200 psig
    High Pressure 440 psig

    Other units have,
    ...
  12. Replies
    4
    Views
    757

    Does anybody know about efficiency requirements...

    Does anybody know about efficiency requirements (COP) of pool heat pumps in the state of Florida. What is that efficiency and at what condition?
  13. Replies
    9
    Views
    1,994

    I am positive it has one fixed orifice.

    I am positive it has one fixed orifice.
  14. Replies
    9
    Views
    1,994

    I am a household refrigerator/freezer design...

    I am a household refrigerator/freezer design engineer and know about refrigeration. Although heat pumps are different from refrigerators, but the fundumentals are the same.

    I am removing the...
  15. Replies
    9
    Views
    1,994

    I have a heat pump which cools and heats pool...

    I have a heat pump which cools and heats pool water. The unit has a fixed orifice and I need to replace it with TXV. Do I need to use (2) TXVs with check valves? Can I use just one TXV with no...
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