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VMH Inverter Mini-Split OWNER’S MANUAL Heat Controller, Inc.
5
Mode Temp
Ambient Operating Conditions
Fahrenheit Celsius
Cooling
Outdoor 5 to 122 -15 to 50
Indoor =62.6 =17
Heating
Outdoor 5 to 93.2 -15 to 34
Indoor =86 =30
Dehumidication
Outdoor 5 to 122 -5 to 50
Indoor >50 >10
See chart below for operating conditions:
Operating Conditions:
When cooling is needed year round, including when outdoor temperatures are apt to fall below freezing, our
V Series inverter driven ductless mini-split systems will continue to work, as they come with factory installed
low ambient controls. The low ambient feature works by regulating the head pressure by varying the amount of
air ow through the condenser, which helps to prevent evaporator freeze ups and low pressure problems due to
low ambient outdoor temperatures. Low ambient operation is a great feature for temperature/humidity sensitive
environments or applications such as server/computer rooms, supermarkets, restaurants, or cooling tower fans.
Additionally, a crank case heater is required and factory installed, as it is needed for use with the low ambient
controls. The crank case heater minimizes liquid refrigerant migration to the compressor when the compressor
is not operating and helps to keep the compressor oil warm enough so that it remains uid to prevent slugging.
Crank case heaters also assist to greatly reduce heat loss to ambient air. Together, the lower ambient feature
combined with the factory installed crank case heater, will not only allow the air conditioner to cool year round,
but will also prevent compressor failure in low ambient conditions.
Manual Operation:
Manual operation can be used temporarily to run the unit without using the remote controller. This feature can
also be used to test the unit during installation and troubleshooting by an authorized service technician.
NOTE: This manual does not include Remote Controller Operations, see the <<Remote Controller Manual>>
packaged with the unit for details.
( C)
NOTE: The unit must be turned off before operating the
manual control button. If the unit operational, continue press-
ing the manual control button until the unit is off.
1. Grasp both sides of the panel and pull it down. The panel
opens upward to an angle of 15°. Push the panel upward
and then lift it up.
2. One press of the manual control button will lead to the
forced AUTO operation. If the button is pressed twice
within ve seconds, the unit will operate under forced
COOL operation. Press the button a third time to stop the
manual operation.
3. Close the panel rmly to its original position.
CAUTION:
• This button is used for testing purposes only.
• To restore the remote controller to control the unit, siply
begin to operate the unit with the remote controller.