LAARS Pennant PNCV (Sizes 200, 300, 400) - Install and Operating Manual - Manual (Page 31)

LAARS Heating Systems
Page 30 Pennant 200, 300, 400 Page 31
6.6.3 Changing Control Loop 1
Parameters
There are four parameters that affect the
operation of control loop 1. SP1 is the setpoint. td1
is the temperature differential. St2 is the stage 2
differential (when applicable) and Std is the stage 2
time delay. To change any of these parameters:
1. While the default temperature is displayed, press
and hold the upper and lower buttons together
until SEL is displayed.
2. Release the buttons, and CH1 will be displayed.
3. Within 30 seconds, press and hold the upper and
lower buttons together until the parameter you
want to change is displayed.
4. Release the buttons to displayed the value of that
parameter.
5. Within 30 seconds, press the upper button
to increase the value, or the lower button to
decrease the value of the parameter.
6. When the desired value is shown, stop pushing
the buttons. The revised value is effective
immediately.
7. In 30 seconds of button inactivity, the display
reverts back to the default temperature, and the
new value is stored in nonvolatile memory.
6.6.4 Enabling and Disabling Control
Loop 2
The Pennant must be told to recognize control
loop 2, which uses thermistor 2. To enable or disable
control loop 2:
1. While the default temperature is displayed, press
and hold the upper and lower buttons together
until SEL is displayed.
2. Release the buttons, and CH1 will be displayed.
3. Within 30 seconds, press the upper (or lower)
button. CH2 will be displayed.
4. Within 30 seconds, press and hold the upper and
lower buttons together until En2 is displayed.
5. Release the buttons. The current state, on or oFF,
will be displayed.
6. Within 30 seconds, press the upper (or lower)
button to toggle the En2 state, between on and
oFF.
7. When the desired state is shown (on for enable,
and oFF for disable), stop pushing the buttons.
The revised state is effective immediately.
8. In 30 seconds of button inactivity, the display
reverts back to the default temperature, and the
En2 selection is stored in nonvolatile memory.
6.6.5 Changing Control Loop 2
Parameters
There are five parameters that affect the
operation of control loop 1. En2 is the status. SP2 is
the setpoint. td2 is the temperature differential. ICE
St2 – Stage 2 temperature differential, for 2-stage
units. Factory default is 5°F (3°C). It is adjustable
from 0°F to 20°F (0°C to 11°C). Stage 2 (high fire) is
energized after the Std time delay, which begins when
the Pennant sensor reads less than or equal to SP1-td1-
St2. When set at 0°F/C, stage 2 is energized using only
the time delay Std.
Std – Stage 2 time delay. Default is 10 seconds.
It is adjustable from 0 to 300 seconds. Std and St2
work together to determine when stage 2 (high fire) is
activated on a two-stage unit.
Ch2 – Control loop 2 (thermistor 2). It is
accessed by pressing and holding the upper and lower
buttons, so that SEL appears, and then pressing one
of the buttons to scroll until Ch2 appears. This allows
programming access for the auxiliary thermistor.
En2 – Status of control loop 2, either on or off.
Default is on. Thermistor 2 will not be recognized
when En2 is off. (ICE and EP can override Ch2.)
SP2 – Control loop 2 (auxiliary) temperature
setpoint. Factory default is 180°F (82°C) for boilers,
and 125°F for water heaters. It is adjustable 35°F to
240°F (2°C to 116°C) for boilers and 65°F to 190°F
(18°C to 88°C) for water heaters. The Pennant is called
for heat and the auxiliary contacts are closed when
the temperature at the secondary sensor is less than or
equal to SP2-td2. The Pennant call for heat ends, and
the auxiliary contacts are opened when the temperature
at the secondary sensor is greater than, or equal to SP2.
td2 – Control loop 2 (auxiliary) temperature
setpoint differential. Factory default is 5°F (3°C). It
is adjustable from 2°F to 20°F (1°C to 11°C). This
defines the temperature below the setpoint that the
Pennant is called for heat and the auxiliary contacts are
closed on a fall in temperature.
ICE – Enables response from the low temperature
protection feature. It can be turned on or off, and the
default is on. When it is enabled, the Pennant is called
for heat and the auxiliary contacts are energized when
the temperature sensor detects less than 40°F (4°C),
and are de-energized when the temperature rises above
45°F (7°C).
EP – Enables the exerciser feature. It can be
turned on or off, and the default is on. When it is
enabled, the auxiliary contacts are closed for one
minute, if they have not been closed over the last 72
hours.
dEf – Default temperature display. Factory
default is rt1, which is the temperature at the Pennant
sensor (thermistor 1). The user may choose rt2, which
is the temperature at the auxiliary sensor (thermistor
2). To access this, press and hold both upper and lower
buttons. When “SEL” is displayed, press either the
upper or lower button, until “dEf” is displayed.
UnI – Allows the user to choose between °F and
°C. Factory default is °F. To access this, press and
hold both upper and lower buttons. When “SEL” is
displayed, press either the upper or lower button, until
“UnI” is displayed.