4421 Tradition Trail ● Plano, Texas 75093 ● 972-964-2700 ● 800-836-7472
SP-ENG-211-000-17 Rev 1.3
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Default Settings:
55°F Heat Set Point
3°F Differential
At the default settings the heater turns on at 52°F and operates until temperature has reached 55°F.
Refer to Digital Temperature Controller Programming section for details on changing these
parameters.
Corrosion Protection
The copper tubing and aluminum fins used in the air conditioner refrigeration circuit are subject to
damage in the presence of corrosive chemicals such as hydrogen sulfide, chlorine, etc. Condenser
and evaporator coils are available with electrostatically applied epoxy coating to prevent corrosion.
Three options are available to protect the air conditioner from premature failure due to corrosion.
A-Level Protection:
Coated condenser coils. Included in NEMA Type 4X units. Available in NEMA Types
12 and 4.
B-
Level Protection:
Coated condenser and evaporator coils. Available in NEMA Types 12, 4 and 4X.
C-
Level Protection:
Coated condenser and evaporator coils plus coated refrigeration tubing. All copper
joints brazed with 45% silver solder, then epoxy painted. Available on NEMA Types
12, 4 and 4X units.
Note
: C-Level Protection is strongly recommended for 4X
applications requiring 316 stainless steel.
Low Ambient
This option consists of circuitry to protect the compressor in a low ambient temperature environment.
The low ambient package is designed to provide an optimum constant low current in the compressor
motor during the non cooling state. This option provides internal heat to the compressor to protect it
from stalls and hard starts during long periods of compressor off state.
Dry Contact
This option provides an early warning capability to your enclosure to aid in the protection of your
expensive equipment. The Dry Contact is programmed with an individual dry contact set point to
monitor the enclosure temperature limit that you require. When the enclosure temperature has
exceeded the maximum limit, the Form C gold plated contact will activate to notify you that there is a
problem in achieving your cooling set point.
Default Settings:
105°F Dry Contact High Temperature Alarm Set Point
2°F Recovery Differential
3min Temperature Alarm Delay
At the default settings the Dry Contact initial conditions are normally open and/or normally closed.
When the unit is powered on and the temperature exceeds 105°F for a period longer than 3 minutes
the Dry Contact will activate. At this time the normally open contact will close and the normally closed
contact will open. This state will remain until the temperature has decreased to 103°F.
