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Heat Pump Pool / Spa Heater Owner’s Manual
7
PST-4
The PST-4 temperature control is similar to the PST-1
shown above, with two differences. (1) The PST-4 has
a Time Clock Override. (2) The PST-4 has no power
indicator light.
Please read the data for the PST-1 on the previous page before continuing. It will provide you with
descriptions of button functions and setpoint programming.
Time Clock Override: This feature must be connected by an electrician . TCO provides a method of
maintaining the pool temperature when a time clock has the pool filter pump
turned off. TCO function then controls the pool filter pump via the PST-4.
TCO will automatically turn the pool filter pump on after 2 hours of “off
time”. It will run the filter pump for 10 minutes while monitoring the water
temperature. If there is more than a 2-degree difference between the setpoint
and the actual pool temperature the heat pump will energize and continue to
run until the setpoint is satisfied.
A user may temporarily override the TCO. An example would be that you
want to use your pool between 9:00 and 10:00 pm. The control may be
programmed to energize the filter pump, which will engage the heat pump to
maintain the pool temperature. This is a temporary measure that can be
initiated in 30-minute increments, for a period up to 3 hours.
Programming for Temporary Pump Override:
1) Push and hold up and down buttons simultaneously – Display reads P0.0
2) Release buttons.
3)
Push up button – display reads P0.5 ( Each time the up Arrow engages, the
display will increase by . 5 increments. Each . 5 increment equals 30 minutes,
3 hours is the max.).
4)
Push down button to decrease the temporary override time.
Example of typical TCO cycle : When the time clock turns off the filter pump, a “PS” will show on
the display. A timer starts inside the controller. After 2 hours, the heater will start the filter pump to
circulate water. “PS” is removed from the display and if a demand for more heat is made, the heater
goes back to normal operation. When the water is brought back to temperature, the TCO turns off the
filter pump and the heat pump will shut-down, displaying “PS”. The 2-hour timer is reset and the cycle
will begin anew.
For help troubleshooting this type of control, refer to the Troubleshooting Guide for
DIGITAL
Thermostat Control in the back of this manual.
Notes:
1. An electrician must
wire the TCO
function to your pool
system before it will
work.
2. The 2-hour TCO
checking interval
cannot be adjusted.