- 3 -
Front
Panel
Layout
Legend:
1.
LCD display window
2.
SERVICE LED – used to indicate network configuration
status
3.
SET Button - used to enter and exit programming mode
and to advance through thermostat parameters
4.
DOWN Button - used to adjust thermostat parameters
5.
UP Button - used to adjust thermostat parameters
3
1
2
4
5
- 4 -
Thermostat
Modes
The PL-1 Thermostat supports the following thermostat
modes:
COOL Mode - In this mode the thermostat will
engage the cooling solenoid via RELAY 1 whenever
the cool probe temperature
1
rises above the set point
value.
HEAT Mode - In this mode the thermostat will
engage the heating solenoid (selectable between
RELAY 1 and RELAY 2)
2
whenever the heat probe
temperature
3
falls below the set point value.
•
AUTO Mode - In this mode the thermostat will
automatically switch between HEAT and COOL modes
as required. The following are the salient parameters
and operating characteristics of AUTO mode:
•
RELAY 1 is always used for COOLING
•
RELAY 2 is always used for HEATING
•
Set Point (SET 1) is the COOLING set point
•
Set Point 2 (SET 2) is the HEATING set point
•
HEATING and COOLING functions are mutually exclusive,
with COOLING taking precedence over HEATING. In other
words, should conditions be such that the criteria for both
heating and cooling are met simultaneously, the
thermostat will engage only the cooling relay and not the
heating relay.
OFF – In this mode all thermostatic operation is
disabled as are all alarms. Additionally, when
operating in a TankNET
®
server environment, data
logging and alarm notifications for the thermostat are
also disabled.
1
See COOL PROBE (“CP”) parameter
2
See HEAT RELAY (“Hr”) parameter
3
See HEAT PROBE (“HP”) parameter
