Thermal Overload; Electric Heat Operation; Electric Reheat Dehumidification; Figure 61 Verifying Electric Heat Output Status - Bard MEGA-TEC W180B Service Instructions Manual

6. The status is displayed next to Elect. Heat 1 and
Elect. Heat 2 (see Figure 61).
FIGURE 61
Verifying Electric Heat Output Status
The electric heat outputs can be put into override to
aid in troubleshooting. The override will only stay active
for 5 minutes.
To override the electric heat outputs:
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 I/O Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Digital
Outputs; press ENTER key.
5. Press UP or DOWN keys to scroll to Digital Outputs
C2-4.
6. Press ENTER key to scroll to Enable Override (see
Figure 62).
7. Press UP or DOWN key to change value to Yes.
8. Press ENTER key to scroll to selected electric heat
output.
9. Press UP or DOWN key to change value to On or Off.
FIGURE 62
Overriding Electric Heat Output

Thermal Overload

The heater assembly has a thermal overload wired in
series with the heating element. This device has a
cycling limit. For S voltage models, the limit opens
Manual 2100-749
Page 38 of 68
at 190°F and resets at 140°F. For N, Q and T voltage
models, the limit opens at 180°F and resets at 130°F.
The limit is also equipped with a redundant thermal
fuse that will open at 240°F.

Electric Heat Operation

The heat strip will be activated on a call for heat. This
call can be generated by the LC or the wall-mount unit
operating in orphan mode or stand-alone mode.

Electric Reheat Dehumidification

The MEGA-TEC wall-mount unit can be ordered with
optional electric reheat dehumidification. This feature
is indicated by the letter "E" in the 6th character of
the model number. Electric reheat dehumidification is
only available as a factory-installed option that must be
ordered with the unit. It cannot be installed in the field
on an existing unit.
To verify the dehumidification capability of a unit and/
or disable the dehumidification operation:
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 System Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Dehum Config
A9 (see Figure 63).
NOTE: Capability on this menu will show the unit's
dehumidification capability based on the model
number entered into the wall-mount unit's
controller. This parameter will show either Not
Available or Electric Reheat.
5. Press ENTER key to scroll to Enable.
6. Press UP or DOWN keys to change the value from
Yes to No.
FIGURE 63
Electric Reheat Dehumidification
An electric reheat capable unit will allow for concurrent
operation of compressor and electric heat. This allows
the compressor to operate which will remove moisture
from the indoor air while the electric heat keeps the
space temperature from dropping during this operation.