Federal ITD Series, Installation & Operation Instructions

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REFRIGERATION
Self-Contained Models
MODEL
R134A
CHARGE
PRE
12/1/19
R531A
CHARGE
POST
12/1/19 REFRIGERATION
ITR3626 & ITR3634 & ITRSS3626 &
ITRSS3634 18 OZ 17 OZ 1/2HP
ITR4826 & ITR4834 & ITRSS4826 &
ITRSS4834 20 OZ 19 OZ 1/2HP
ITR6026 & ITR6034 & ITRSS6026 &
ITRSS6034 24 OZ 23 OZ 1/2HP
The self-contained models manufactured before 12/1/19 are shipped from the factory with a completely
operational 134A refrigeration system and require no modifications or adjustments upon installation.
Models produced after 12/1/19 are shipped with 531A. Case must be installed per the installation section of
this manual to provide proper condensing air cooling.
Self-Contained Refrigeration Operation
The unit temperature is controlled by an electronic control that senses air temperature and turns
refrigeration on and off as required to maintain proper temperature.
The electronic control will also sense a frosted coil that requires a defrost cycle and shuts off refrigeration
until defrost is complete. There are also a defined number of scheduled defrosts that also shut the
refrigeration off to insure a full defrost.
Remote Models Use pressure gauges to set pressure control
MODEL
REFRIGERANT
PRE 12/1/19
REFRIGERANT
POST 12/1/19 REFRIGERATION
PRESSURE
CUT IN
PRESSURE
CUT 0UT
ITR3626R & ITR3634R &
ITRSS3626R &
ITRSS3634R R134A R531A
3400
BTUH@90F/20F 25# 5 #
ITR4826R & ITR4834R &
ITRSS4826R &
ITRSS4834R R134A R531A
3800
BTUH@90F/20F 25# 5 #
ITR6026R & ITR6034R &
ITRSS6026R &
ITRSS6034R R134A R531A
4200
BTUH@90F/20F 25# 5 #
Use pressure gauges to set pressure control