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Pool Water Temperature Control
One of the features of the PC's GEN2 Control Board is
built in aquastat functionality known as "Setpoint Control". This
is an internal routine to sample the pool water temperature to
determine if pool heat is required; water temperature is meas-
ured using a sensor in a well in the internal PVC piping. The
pool pump is turned on at regular intervals to refresh the water
temperature (if the system is set up for the PC unit to have con-
trol of the pump). If the PC unit has control of the pool pump
and sampling is not desired, there is the option to use an exter-
nal accessory temperature sensor.
There is also provision to connect an external aquastat or
controller instead of using this routine, for example if two pools
of two different temperatures are being heated.
1. Pool Water: Setpoint Control
It is recommended that this method be used to control the
PC system's pool water heat demand since it eliminates the
need for an external temperature sensor or aquastat.
There are two options for Setpoint Control, Indoor Loop
(ICR) method and HTS/CTS method.
Setpoint Control Method 1 - Indoor Loop (ICR)
This is the default method and uses the Indoor OUT tem-
perature probe inside the unit (actually located on the IN pipe)
for control. Its value is displayed in the Pool Water Temperature
box on the PC App's
View-->Pool Water Setpoints
this temperature shows NC, then either the probe is not con-
nected to the board or there is a problem with it.
Unless the pool pump is set up to run continuously, the PC
unit will cycle the pool pump on and off when the unit is not in
pool heat mode, in order to sample the water temperature.
When pool heat mode ends, the pool pump will continue to run
for 30 seconds. It will then cycle with an OFF time and ON time
as set by the
Set ICR Sampling
SET is clicked on the
View-->Pool Water Setpoints
The timer counts downs the time remaining before the next
switch between ON/OFF. The Pool Circulator indicator will indi-
cate when the circulator is ON, OFF or SAMPLING. The default
sampling times are 2 minutes ON and 6 minutes OFF. The LCD
interface will indicate when the ICR is sampling (ON) as well.
The Timer Override button will reduce the countdown timer to 10
seconds.
See the next column, and also the
App)
section for full screenshots of the various windows.
Setpoint Control Method 2 - External HTS/CTS
When this method is used, no pool pump control for tem-
perature sampling will occur. It requires an external tempera-
ture sensor placed in a dry well in the pool water. Its value is
displayed in the Pool Water Temperature box on the PC App's
View-->Pool Water Setpoints
shows NC, then either the probe is not connected to the board
or there is a problem with it.
ISSUE 03: 1-Oct-2021
window. If
popup which appears when
window.
PC Application (PC
screen. If this temperature
A 10K Type 7 (or Type 3) NTC thermistor along with a 10K
1% or better resistor must be connected to the control board in
order to use the External HTS/CTS method. Connect the sen-
sor to the AI_5 input as shown above and on the wiring diagram
(SCH) in the
Model Specific Information
AI_5 jumper on the control board.
For both setpoint control methods, pool water setpoint is
controlled through the LCD interface or PC App
Water Setpoints).
Set units
(STANDARD
or METRIC)
Measured
pool water
temperature
Pool water
temperature
setpoint
The recommended Setpoint of 80°F and Delta of 2°F are
shown. This is 2°F less than the air setpoint, which will mini-
mize evaporation rate from the pool, as described in the
Sizing
section.
With these setpoints, pool water heating will be called for if
the pool water temperature drops below 78°F, and will persist
until the pool water temperature rises to 80°F.
2. Pool Water: Signals Control
In this control method, pool water heat demand comes
from an external device, like an aquastat, combination of aq-
uastats, or other controller with a dry contact that relays a
24VAC signal.
The wiring connections are at the top right of the PC's
control board, on the screw terminal connector section marked
AQUASTAT. This is shown on the wiring (SCH) diagram in
the
Model Specific Information
needs to send the 24VAC signal from RA back to the Y1A termi-
nal to call for pool water heating. C is the common or ground
terminal for powering the external device.
Page 25
section. Remove the
(View-->Pool
Set pool circula-
tor ON/OFF
sampling inter-
vals (only has
effect if pump
controlled by PC
unit)
PC
section. The external device
002291MAN-03
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