Operation; On/Off; Heat/Cool Operation; Auto Mode - Bard W18AAPA Installation Instructions Manual

OPERATION

See Figure 22 and Figure 23 (page 26) for overviews of
th-TUNE buttons and icons.

On/Off

Press and hold power button for 2 seconds to turn th-
TUNE on or off.

Heat/Cool Operation

Auto Mode

During Auto mode, the unit will automatically switch
between heating and cooling operations to maintain
the space temperature between the heating and cooling
setpoints. For details on how the temperature control
strategy operates, please see the latest revision of
MULTI-TEC Service Instructions manual 2100-665.

Heat Mode

In heat mode, the controller will disable the cooling
operations of the wall-mount unit and maintain the
space temperature above the heating setpoint.

Cool Mode

In cooling mode the controller will disable the heating
operations of the wall unit and maintain the space
temperature below the cooling setpoint.

Changing the Setpoint

To change the cooling setpoint, turn the knob (see
Figure 21) on the front of the th-TUNE until the
desired setpoint is reached. Once this is complete, the
th-TUNE will load the new cooling setpoint after the
knob has stopped turning for 3 seconds. The heating
setpoint will adjust proportionally when the cooling
setpoint is changed (see Heating Differential).
FIGURE 21

Change Setpoint

Manual 2100-678C
Page 24 of 26

Changing the Clock

The time and date displayed on the th-TUNE will
automatically sync to the wall-mount unit controller
time and date settings. To change time and date, use
the TEC-EYE to change settings in the MULTI-TEC wall-
mount unit.

Changing to Celsius

Changing to Celsius must be done in the MULTI-TEC
unit using the TEC-EYE.

Blower Operation

There are two modes of blower operation available while
using the th-TUNE. The first mode operates the blower
during active heating and cooling calls. The second
mode operates the blower continuously to continuously
circulate the air.

th-TUNE Setup Options Using the TEC-EYE

At this time, there is only one th-TUNE option, heating
differential, that can be set up using the TEC-EYE
hand-held diagnostic tool. For additional information
about using the TEC-EYE, see the latest revision of
MULTI-TEC Service Instructions manual 2100-665.

Heating Differential

This value maintains the separation between the
cooling and heating setpoints. This separation is
maintained even when the system is put into cooling
only or heating only. If the system is in cooling or
auto mode, the th-TUNE will display the cooling
setpoint and the heating setpoint will be determined
by subtracting the heating differential from the cooling
setpoint. If the system is set to heat only, the heating
setpoint will be displayed and the cooling setpoint will
be determined by adding the heating differential to the
heating setpoint.
Example: If the heating differential is set to 17°F
(default) and the cooling setpoint is set to 77°F
(default), the heating setpoint will be determined by
subtracting 17° from 77°F resulting in a 60°F heating
setpoint. If the cooling setpoint is increased by 3° to
80°F, the heating setpoint would automatically change
to 63°F.
To adjust the heating differential (using the TEC-EYE):
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to Adv System
Config; press ENTER key.
4. Press UP or DOWN keys to scroll to th_Tune Setup
B4; press ENTER key.
5. Press ENTER key to scroll to Heating Offset (see
Figure 19 on page 23).