Adjusting Water Flow Using ΔT (Delta-T)

The Delta-T is the temperature difference between the water temperatures entering and leaving the heat pump.

The equipment can be fine-tuned for maximum performance by balancing water flow rates to maintain an ideal ∆T.

The adjustment procedure must be completed with the unit in heating mode

Geothermal Menus

These menus are used when adjusting Water Flow Using ΔT (Delta-T) on a geothermal heat pumponly.

Enter "Advanced" menus, then proceed

 

A

PRESS MENU

BUTTON

 

B

USE ARROWS TO

"SYSTEM"

 

C

PRESS "ENTER"

 

 

D

USE ARROWS TO

"ADVANCED"

 

E

PRESS "ENTER"

 

 

1

ARROWS TO MENU

"GEOTHERMAL"

 

 

 

2

ENTER TO VIEW

"SOURCE DIFFERENCE"

 

 

3

ARROWS TO VIEW

"POOL / SPA DIFFERENCE"

 

 

 

4

ARROWS TO VIEW

"SOURCE PUMP"

 

 

 

5

ARROWS TO VIEW

"SOURCE FLOW"

 

 

 

6

ARROWS TO VIEW

"SOURCE INLET"

 

 

 

7

ARROWS TO VIEW

"SOURCE OUTLET"

 

 

 

8

ARROWS TO VIEW

"POOL / SPA INLET"

 

9

ARROWS TO VIEW

"POOL / SPA OUTLET"

 

 

 

MENU TO EXIT, PRESS

& HOLD TO STATUS

 

 

 

 

  1. Adjust the thermostat to its lowest setting with the unit in heating mode.
  2. Deactivate the water filtration pump.
  3. Confirm that the filters leading to the heat pump are clean.
  4. Adjust the valves controlling water headed towards the heat pump to the half-open position.
  5. Adjust the valves controlling water leading away from the heat pump to a fully open position.
  6. Activate the pool water filtration pump.
  7. Slowly raise the thermostat temperature until the heat pump activates.
    • The source-water filtration pump will cycle on first.
    • After a four-minute delay, the heat pump's compressor will start.
  8. With the heat pump running, confirm the source-side water filtration pump is operating properly with adequate flow and no short cycling.
  9. Wait for water temperatures to stabilize (approximately 5 minutes).
  10. Open the temperatures differences screen in the Geothermal Menus.
  11. Adjust valves in the following order using the temperature chart provided.
    1. Adjust the source-side valve on the heat pump outlet until the correct temperature differential is achieved.
    2. Adjust the pool-side valve that controls water exiting the heat pump until the correct temperature differential is achieved.
    3. Wait for water temperatures to stabilize. Then check the source-side temperature again. Re-adjust the valve as needed.
  12. Mark valves at these positions for future reference.

 

 

Table 1 - Temperature Chart (Water Source)
HEAT EXCHANGER TYPE MODEL SOURCE-SIDE POOL-SIDE
Titanium pool-side and source-side exchangers WS03

1° to 5° F

(.5° C to 2.8° C)

2° to 4° F

(1.1° C to 2.2° C)
WS05

2° to 8° F

(1.1° C to 4.4° C)

3° to 6° F

(1.7° C to 3.3° C)
WS10

5° to 12° F

(2.8° C to 6.7° C)

6° to 14° F

(3.3° C to 7.8° C)
Titanium pool-side exchanger and cupronickel source-side exchanger WS03

6° to 8° F

(3.3° C to 4.4° C)

1° to 3° F

(.5° C to 1.7° C)
WS05

7° to 13° F

(3.9° C to 7.2° C)

2° to 6° F

(1.1° C to 3.3° C)
WS10

6° to 11° F

(3.3° C to 6.1° C)

6° to 14° F

(3.3° C to 7.8° C)

 

Table 2 - Temperature Chart (Sun Power)
HEAT EXCHANGER TYPE MODEL SOURCE-SIDE SPA-SIDE
Titanium ThermoLink® SP05

2° to 8° F

(1.1° C to 4.4° C)

3° to 6° F

(1.7° C to 3.3° C)

Please note -

  • Temperature differences are based on pool and source water temperatures of 69° to 75° F. (20.5° to 23.8° C)
  • For water temperatures outside this range, contact AquaCal®.