Table of Contents
Advertisement
Operation
BACnet Control
If controlling the system via the BACnet interface, skip the
entire
Operation
section. In this case, demands for dehumidifi-
cation, air heating, air cooling, and pool water heating will come
from the building control system. The supplied air thermostat
should not be used, and internal Setpoint Control for pool water
temperature will not be active.
See the
BACnet Interface
network specification and BACnet object names.
Air Thermostat Operation
Whenever the PC unit is powered up, the thermostat will
measure the room air temperature and relative humidity (RH),
and alternate between the two values on the LCD interface.
1.
The first SCROLL button press will display the air tempera-
ture setpoint on the LCD. Press the up or down arrow but-
tons to adjust the setpoint.
2.
The second SCROLL button press will display the auxiliary
air temperature (plenum heater) setpoint on the LCD.
"HEAT" indicator will be displayed. Setpoint may be adjust-
ed with the arrow buttons.
3.
The third SCROLL button press will display the RH setpoint.
"RH" indicator will be displayed. Setpoint may be adjusted
with the arrow buttons.
4.
The fourth SCROLL button press brings back the alternat-
ing temperature/RH display.
SCROLL
BUTTON
FIGURE 3: BAPI STAT4 Air Thermostat
NOTE:
If air thermostat is just displaying tempera-
ture instead of alternating temperature/RH,
flip the PROG dip switch on thermostat, then
go to menu P6 and set it to rHT.
This is normally done at the factory.
ISSUE 03: 1-Oct-2021
section later in this manual for
TEMP / RH
DISPLAY
ARROW
BUTTONS
Changing Air Setpoints Using PC App
The air setpoints can also be changed through the free PC
App software, as shown below. This requires a laptop connect-
ed via USB cord to the control board; see the
(PC App)
section for more details.
Go to
View-->Pool Room Control (MODBUS)
up the window below. Once settings are adjusted in PC App, be
sure to press the SET BAPISTAT4 button to write the new val-
ues to the thermostat.
Aux. heat (plenum heater) tem-
perature setpoint
The recommended Stage 1 Setpoint of 82°F and Delta of
2°F are shown. This is 2°F higher than the pool water set-
point, which will minimize evaporation rate from the pool, as
described in the
PC Sizing
Setpoint is 81°F with a Delta of 2°F, so that the air temperature
does not fall much below the pool temperature in cold weather
when the plenum heater may be doing most of the air heating.
With these setpoints, air heating demand will be activated
if the air temperature drops below 80°F, and will persist until the
air warms up to 82°F. (Air Reheat mode, like the other modes,
will only actually come on according to the demand table in the
first section of this manual.) If the air temperature continues to
drop to 79°F, the plenum heater will come on and stay on until
the temperature rises to 81°F; plenum heater operation does not
depend on the other demands or operating modes.
Also, with the setpoints shown and if presence of an AC2
outdoor unit is detected, when air temperature exceeds 84°F air
cooling demand will be activated, and persist until air tempera-
ture falls to 82°F.
Air Thermostat Setup
The thermostat should come pre-configured to operate as
described. If an unconfigured thermostat is received, it should
be set up to alternate its LCD display between air temperature
and RH readings as follows:
Remove cover and set DIP switch #7 (PROG) to ON.
Use the arrow buttons to advance to P6 - LCD Mode.
Push the SCROLL button to select.
Use the arrow buttons to adjust the value of P6 to "rHt".
Push the SCROLL button to enter.
To exit Program Mode, set DIP switch #7 back to OFF.
Then start the PC App and press the SET BAPISTAT4
button as shown above to write the rest of the configuration val-
ues to the thermostat.
Page 24
PC Application
to bring
Set units
(STANDARD
or METRIC)
Measured room
air temperature &
humidity
Room humidity
setpoint
Room
temperature
setpoint
Send window's
settings to room
air thermostat
Return to default
settings
section. The recommended Auxiliary
002291MAN-03
Advertisement
Table of Contents
