NEED TECH SUPPORT HELP?

1-870-892-8343

Hours: 6am-4pm CST Mon - Fri

Contact tech support

DIRECTIONS FOR CHARGING TYPICAL HYDRO-TEMP SYSTEM

 

To get optimal performance from your Hydro-Temp system, proper charging is essential.

 

 For proper charging you need to have the entering air at the normal temperature.  We advise around 72 - 75 °F.  As a rule of thumb you will need to move 400 CFM’s per ton of air.  If you are able to charge the system in priority mode you should try to maintain the entering hot water temperature around 110 - 120 °F, with a flow rate through the hot water loop of 5 - 8 GPM’s.  The ground water must flow at a rate of approx. 2.5 - 3 GPM’S per ton if closed loop or 1 GPM per ton if well water.

 

 If the system you are charging is a priority hot water system its best to charge in priority hot water mode with the tank temperature around 80 - 90 ºF.  If it is not a priority system charge in the mode most needed at the time depending on the condition of the house.  Always check the charge in heat mode before completing. (This must be done due to the fact that the receiver will store refrigerant in the cooling mode, meaning it will use more refrigerant while running in the heating mode.  If you charge in the cooling mode it could be undercharged for heating.)

 

You should always charge in the highest speed the system will run.  Dual compressor systems need to have both compressors running and variable speed systems should be in high speed.

 

1.  DETERMINE AND SET THE SUBCOOLING.

 A.  Determine the necessary factors.

  Cooling:  Determine the temp. of the refrigerant line between the expansion valve and the water coil.

 

  Heating:  Determine the temp. of the refrigerant line between the expansion valve and the air coil.

 

 B.  Determine the Saturation temp. of the high side in °F. (Inner most # on high side gauge)

 

 C.  SUBCOOLING = B - A

 

 D.  The ideal subcooling range is 8-15 °F.  If your subcool is low you simply add refrigerant to bring up.  If you need to lower subcooling then you would have to recover refrigerant.  If you reach a point  that the SUBCOOL will no longer increase no matter how much refrigerant you add STOP adding refrigerant.   You  should reclaim the refrigerant back to the point at which it stopped increasing.  A 3 °F Subcool is  acceptable in this instance..

 

2.  DETERMINE AND SET THE SUPERHEAT.  (Only after the subcooling has been set.)

 

 A.  Determine the temp. of the suction gas 4 - 6 inches from the compressor.  (Be sure the temp. probe is under the insulation so as not to be effected by ambient temp.)

 

 B.  Determine the Saturation Temp of the low side in °F. (Inner most # on low side gauge)

 

 C.  SUPERHEAT = A - B

 

 D.  The ideal superheat is 8-15 °F.

 

 E.  To adjust the superheat you will need to adjust the expansion valve.

 

       >To DECREASE the superheat adjust the expansion valve COUNTERCLOCKWISE. (Open)

       >To INCREASE the superheat adjust the expansion valve CLOCKWISE. (Closed)

 

  (Direction of turn would be as if looking at valve from underneath)

 

  One turn will normally change the superheat approx. 5-8 °F.

  As much as 30 minutes may be required for the system to stabilize.

 

 

Click here to return to simple charging via superheat only