Discharge Line Temperature Protection; Ul High Pressure Safety Control - Hussmann Freedom Line series Installation & Operation Manual

AE8-1376 R5

7.1 Discharge Line Temperature Protection

The Electronic Unit Controller uses a temperature
sensor, which allows for more flexibility in what the
controller can do. If the unit trips, the unit will display
an error code and log that an error has occurred. In
addition, the controller will allow an automatic reset up
to 4 times per hour. On the fourth trip, the controller will
require a manual reset. The parameter "nPS" can be
changed in the Advanced Options Menu (see Section
2.6) to adjust the total number of trips allowed in an hour
before a lockout. If an automatic reset is always needed,
parameter "nPS" can be set to 0.
Controllers built in September 2015 and after are
programmed with a higher discharge line cut-out
temperature and a 5 second trip delay, reducing
nuisance trips.
NOTE: If nuiscance trips are occuring on controllers
built before September 2015 (15I date code), contact
application engineering for support.
Controllers built before September 2015:
Default Discharge Line Cut-in Temp:
Default Discharge Line Cut-out Temp:
Trip Delay:
Controllers built September 2015 and after:
Default Discharge Line Cut-in Temp:
Default Discharge Line Cut-out Temp:
Trip Delay:
© 2015 Emerson Climate Technologies, Inc.
Application Engineering
B U L
170°F
220°F
N/A
170°F
225°F
5 seconds
7-15
L E

7.2 UL High Pressure Safety Control

High-pressure control is a UL (Underwriters Laboratories)
safety device. As such, Emerson Climate Technologies
condensing units equipped with the Electronic Unit
Controller still come with the high-pressure mechanical
control installed on the unit. The high-pressure controls
will all be fixed to work with the control, and the value of
the cut-out will be determined by the working pressure
of the high side of the condensing unit. This should have
no affect on a customer's UL requirements.
The high-pressure control will break power to the
compressor output relay, which will shut down the
compressor regardless of the program state. This
change will also allow the controller to read the high-
pressure control state and display the appropriate error
codes. In addition, the controller will allow an automatic
reset up to 4 times per hour. On the fifth trip, the controller
will require a manual reset. The parameter "HPn" can be
changed in the Advanced Options Menu (See Section
2.6) to adjust the total number of trips allowed in an hour
before a lockout. If an always automatic reset is needed,
parameter "HPn" should be set to 0.
T I N
May 2016