Control Operation; On/Off Control; Fan Control; Temperature Control - Bard MULTI-TEC W18AAPA Service Instructions Manual

CONTROL OPERATION

NOTE: Screenshots shown in this manual reflect
default settings (when applicable).

On/Off Control

The wall-mount unit can be turned on and off with the
TEC-EYE. When the unit is set to ON, the system will
heat and cool the space either in standalone mode or
when connected to the LC. When the unit is set to OFF,
the unit will not heat or cool the space.
To turn the unit on or off:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.
3. Press UP or DOWN keys to scroll to ON/OFF; press
ENTER key.
4. Press UP or DOWN key to change the system from
OFF to ON or from ON to OFF.
5. Press ESCAPE key until Main Menu screen is
displayed.

Fan Control

The blower will be in continuous operation in stand
alone mode. To operate the blower continuously while
communicating with the LC6000 or th-TUNE single
unit controller, refer to the latest version of the
2100-669 LC6000 Service Instructions manual or
2100-678 th-TUNE manual.
Stage 1
Stage 2
Stage 3
72 73
Manual 2100-665G
Page 14 of 28
FIGURE 18
MULTI-TEC Wall-Mount Unit Cooling Staging
Stage 1 Diff Off
Stage 2 Diff Off
Setpoint
74 75 76
Off

Temperature Control

When the unit is connected to the LC controller, it
will receive all of its heating, cooling and ventilation
commands from the controller.
When the unit is in stand alone operation, it will
heat, cool and ventilate based on the return air
temperature measurement. The return air temperature
will be compared to the cooling setpoint. Based
on differentials above and below the setpoint, the
available cooling and heating stages will be utilized.
Cooling Sequence – Economizer Available
(see Figure 18)
If the return air temperature is higher than 79°F
(Setpoint + Stage 1 Diff On) and outdoor conditions are
acceptable for economizing, the unit will enable the
economizer. If the return air temperature is higher than
80°F (Setpoint + Stage 2 Diff On), the unit will enable
mechanical cooling stage 1. If the control value is
higher than 81°F (Setpoint + Stage 3 Diff On), the unit
will enable mechanical cooling stage 2.
Cooling Sequence – Economizer Not Available
(see Figure 18)
If the return air temperature is higher than 79°F
(Setpoint + Stage 1 Diff On), the unit will enable stage
1 mechanical cooling. If the return air temperature is
higher than 80°F (Setpoint + Stage 2 Diff On), the unit
will enable stage 2 mechanical cooling.
Stage 1 Diff On
Stage 2 Diff On
Stage 3 Diff On
Stage 3 Diff Off
77 78 79
Band On
80 81 82 83