Compressor; Enable; Delays And Run Time; Electric Reheat Dehumidification - Bard MULTI-TEC W18AAPA Service Instructions Manual

3. Press UP or DOWN keys to scroll to Sys Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Unit Config
(A6); press ENTER key.
5. Press ENTER key to scroll to Mixed FC Set, Gain,
Integral or Derivative (see Figure 24).
6. Press UP or DOWN keys to adjust parameter value.
7. Press ENTER key to save.
FIGURE 24
Adjusting Damper Modulation Values
Economizer Note
The economizer and mechanical cooling can operate
simultaneously because the economizer uses the mixed
air temperature sensor.

Compressor

Enable

The compressor will be enabled when stage 1 is
enabled and outdoor air conditions are not acceptable
for economizing. If the outdoor conditions are
acceptable, the compressor will run when stage 2 is
enabled.

Delays and Run Time

The compressor will have a minimum run time of 180
seconds and a minimum off time of 120 seconds.
If the compressor is two stage, the second stage will
Cool
Reheat
58 59 60
Dehumidification Control
61 62 64 66
63 65
have a minimum delay of 120 seconds. The 2nd stage
will also have a minimum on time of 120 seconds.
When communicating with the LC, the delay between
compressors in units installed on the same shelter will
be managed by the settings configured in the LC.

Electric Reheat Dehumidification

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.
Dehumidification will only become active if the unit
is connected to the LC6000 and the appropriate
conditions are present.
When the wall-mount unit receives a dehumidification
call from the LC6000, the wall-mount unit will
disable the economizer to force the system to use air
conditioning and prevent any additional humidity from
being introduced from outdoor air. The wall-mount unit
will then turn on the air conditioning system which will
remove moisture and cool the space. At the same time,
the electric reheat coil will be energized to extend the
run time of the cooling cycle and prevent cool air from
being introduced to the space.
When the dehumidification command is first received
both cooling and reheat will be activated.
The cooling will shut off when the return air
temperature is 62°F to prevent the unit from causing
the system to go into heating mode (see Figure 25).
The compressor will turn on again once the return
temperature rises to 75°F.
The electric heat will operate to maximize cooling times
which will in turn remove moisture from the space. The
electric reheat will turn on when the temperature falls
to 73°F and will turn back off at 75°F.
The system will continue to operate this way until the
LC removes the call for active dehumidification.
A heating or cooling call will disable the dehumidification
call. Dehumidification can only take place when system
is not actively heating or cooling.
FIGURE 25
68 69 70 72
67 71
73 74 75 76 77 78
Manual 2100-665G
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