Hayward HeatPro® Owner's Manual page 9

The PST-5 is an upgrade of the PST-4 with the addition of an AUTO function. This allows the heat pump to
heat or cool the water automatically to maintain the setpoint. The PST-5 also has an optional Time Clock
Override (TCO-This feature must be connected by an electrician to operate.)
Read the instructions for the PST-1 and PST-4 fully before continuing. . The PST-1 page will
provide you with descriptions of button functions and setpoint programming. If you have purchased
the TCO option, the PST-4 page will provide TCO functionality and programming procedures.
Run indicator light:
Setting the
AUTO function:
Setting unit to
cool only:
Time Clock Override:
Troubleshooting Guide for
Serves the same function as the "heating" indicator on the PST-1
and PST-4.
1. Disengage the AUTO mode (the AUTO mode indicator light
will be off.)
2. Program your desired temperature setpoint.
3. Press the AUTO button to activate the automatic heat / cool
function. (AUTO mode indicator will light.)
4. "AC5" should show on the display (set at the factory). "AC"
indicates that the cooling function is enabled and the
"5"means that when the water temperature is 5 F above the
setpoint, the unit will energize to cool your pool or spa.
By using the up and down keys, the AC5 can be changed to
values ranging from AC3 to AC9.
Engage the AUTO mode and use the up button to scroll past "AC9". You
will notice that after the display of "AC9" an "ACP" (AUTO Cool
Primary) will be displayed. When "ACP" is displayed, the unit will only
cool the pool and will not go into the heating mode, no matter how
cool the pool gets.
NOTE: The RUN light will flash during cooling cycles.
Refer to TCO information on the previous page. (PST-4)
If troubleshooting this controller, refer to the
DIGITAL
PST-5
Heat/Cool
Thermostat Control
8
.