Maytag Amana VZC20, Installation & Service Reference

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System Setup
This menu allows for the setting of BOOST MODE.
BOOST MODE enables the system to operate at a higher
compressor speed than maximum compressor speed.
BOOST MODE set temperature can be adjusted in BOOST
TEMP menu. When ambient temperature gets higher than
BOOST MODE set temperature, the system will operate in
BOOST MODE.
Equipment Test
The mandatory system verification test is enabled from this
menu, which enables a functional check of the equipment, in
addition to ensuring proper stop valve position.
Maintenance
Pump down and charge modes can be enabled within this
menu.
Cool Set-up
This menu allows for the adjustment of several cooling
performance variables. Cool Airflow Trim, Cool Airflow
Profiles, Cool Fan ON Delay, Cool Fan OFF Delay and
Dehumidification Select (some enable option or off) can
be adjusted in this menu. You can also reset this entire
menu to factory default settings. See the following images
showing the four cooling airflow profiles.
Cooling Airflow Profile
• Profile A provides only an OFF delay of one (1) minute
at 100% of the cooling demand airflow.
• Profile B ramps up to full cooling demand airflow by first
stepping up to 50% of the full demand for 30 seconds.
The motor then ramps to 100% of the required airflow.
A one (1) minute OFF delay at 100% of the cooling
airflow.
50% CFM
1/2 min
100% CFM
100% CFM
1 min
OFF
OFF
• Profile C ramps up to 82% of the full cooling demand
airflow and operates there for approximately 7 1/2
minutes. The motor then steps up to the full demand
airflow. Profile C also has a one (1) minute 100% OFF
delay.
100% CFM
OFF
OFF
•
Profile D
(default) ramps up to 50% of the demand
for 1/2 minute, then ramps to 82% of the full cooling
demand airflow and operates there for approximately
7 1/2 minutes. The motor then steps up to the full
demand airflow.
Profile D has a 1/2 minute at 50% airflow
OFF delay.
OFF
OFF
Airflow Tables
Dehumidification Select
Dehumidification requires a thermostat capable of reading the
indoor humidity level from the thermostat and allows the user
to set a dehumidification target based on these settings.
The thermostat controls the humidity level of the conditioned
space using the cooling system. Dehumidification is
engaged whenever a cooling demand is present and
structural humidity levels are above the target level. When
this condition exists, the circulating fan output is reduced,
increasing the system run over time, over cooling the
evaporator coil and ultimately removing more humidity from
the structure than if only in cooling mode.
The thermostat may also allow for an additional overcooling
limit setting depending on the thermostat utilized. This allows
the cooling system to further reduce humidity by lowering
the temperature below the cooling setpoint in an attempt to
better achieve desired humidity levels.
When Dehumidification mode exists, the circulating fan
output is reduced, increasing system run time, over cooling
the evaporator coil and ultimately removing more humidity
from the structure than if only in cooling mode.
The system can have Dehumidification operation in setting
“STD”, “A”, “B” or “C” of “Dehumidification Select” based on
dehumidification demand.
Setting “STD” allows for the widest compressor operation
range with lower CFM than Cooling mode.
In the Enhanced Dehumidification (setting A, B and C)
the indoor airflow is lower than Standard Dehumidification
(STD).
Setting “A” allows for the same compressor operation
range as standard Dehumidification with lower CFM than
standard dehumidification (STD).
Setting “B” limits compressor operation range and keeps
high dehumidification capacity.
In setting “C” the system runs fixed at 100% compressor
and airflow. See Figure 1.