Features And Functions - Heat Controller SMA 09 Owner's Manual

SMA/SMH

Features and Functions:

Low Ambient Operation and Crank Case Heater Feature:
When cooling is needed year round, including when outdoor temperatures are apt to fall below freezing, our S
Series ductless mini-split systems will continue to work, as they come with factory installed low ambient con-
trols. The low ambient feature works by regulating the head pressure by varying the amount of air flow 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 environ-
ments 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 fluid 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.
See chart below for operating conditions:
Mode
Cooling
Heating
Dehumidification
Manual Operation
Manual operation can be used temporarily to run the air conditioner without using the remote controller. This fea-
ture can also be used to test the unit during installation and troubleshooting by an authorized service technician.
OWNER'S MANUAL
Temp
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Indoor
Ambient Operating Conditions
Fahrenheit
5 to 109.4
=62.6
5 to 75.2
=86
23 to 109.4
>17
1 Open and lift the front panel up until it stops and
makes a clicking sound.
2 By pressing the manual control button, the unit
will be placed into forced AUTO operation mode.
3 Close the panel firmly to its original position.
CAUTION
• Once you push the manual button, the operation mode
will change in the following order:
AUTO
• By pushing the button twice, the unit will be placed
into forced COOL mode, which can be used for testing
purposes.
• By pushing the button a third time, the air conditioner
will stop operating and turn off.
• To restore use of the remote controller to control the
unit, simply begin to operate the unit with the remote
controller.
5
Heat Controller, Inc.
Celsius
-15 to 43
=17
-15 to 24
=30
-5 to 43
>62.6
COOL OFF