Document LTP0099 rev 2a

 

Adjusting Water Flow Using ΔT (Delta-T)

The Delta-T is the temperature difference between the water temperatures entering and leaving the chiller. The equipment can be fine-tuned for maximum performance by balancing water flow rates to maintain an ideal ∆T.

  • Installed Temperature / Pressure probes and ports are required to perform the following procedures.
  • This adjustment procedure is to be completed with the unit in HEA mode only; ACH and COO discharge temperatures are not shown.

Please Note -

Temperature / Pressure ports are required for all commercial applications.

They are strongly recommended (but not required) for residential installations.

Temperature / Pressure Port

(Shown with Probe)

  1. Adjust chiller's thermostat to its lowest setting while in HEA mode.
  2. Deactivate the water filtration pump.
  3. Adjust the valves controlling water headed towards the chiller to the half open position.
  4. Adjust the valves controlling water leading away from the chiller to a fully open position..
  5. Activate the pool water filtration pump.
  6. Slowly raise the thermostat temperature until the chiller activates.
    • After a four-minute delay, the chiller's compressor will start.
  7. With the chiller running, confirm water filtration pump is operating properly with adequate flow and no short cycling. Confirm that the filters leading to the chiller are clean.
  8. Wait for water and refrigerant pressure to stabilize (approximately 5 minutes).
  9. Adjust valves in the following order:
    1. Adjust the valve that controls water exiting the chiller. Match the temperature measured with a temperature pressure probe to the chart. See "Temperature Chart"
    2. Allow pressure to stabilize. Then check temperature again. Re-adjust the valve controlling the water exiting the chiller as needed.
  10. Mark valves at these positions for future reference.

 

Temperature differences are based on pool temperatures of 72° (+ or – 3° F). For water temperatures outside this range, contact AquaCal® Technical Support.

Table 1 - Temperature Chart
MODEL TEMPERATURE
TC500 2° to 5° F
TC1000 2° to 5° F