Traulsen TU044HT - Manual (Page 4)

IV. a - REFRIGERATORS:
Both refrigerators and Freezers do not require manual
defrosting. During normal operation, a refrigerator con-
tinuously circulates above freezing cabinet air through the
coil. A compressor “OFF” cycle occurs every 2 1/2 Hours
for 20 minutes to melt any frost which may accumulate
on the coil during the compressor “ON” cycle. The control
will read “dEF” and the green water drop will be illumi-
nated. With standard holding refrigerators, high relative
humidity is also maintained to prevent dehydration of
stored product.
IV. b - FREEZERS:
During normal operation, a freezer continuously circu-
lates below freezing cabinet air through the coil. The
coil requires a periodic defrosting for proper operation.
This is accomplished by an automatic, time activated,
temperature/time terminated, defrost program, utilizing
hot gas from the refrigeration system. The controller is
preset at the factory for six equally spaced defrost cycles
within each 24-hour period.
At the start of a freezer defrost cycle, the compressor,
condenser fan and evaporator fan shut off. The hot gas
relay will be energized, this will energize the hot gas
solenoid valve thru the normally open contacts and the
condenser fan circuit will be de-energized thru the (nor-
mally closed contacts), and the compressor will restart.
When the evaporator coil sensor reaches 40 0 F the coil is
fully defrosted or if the maximum time of defrost dura-
tion (20 minutes) is reached (which ever comes first) then
the defrost hot gas relay is de-energized. The condenser
fan restarts and the hot gas solenoid valve closes, The
compressor system returns to the cooling mode. Total
refrigeration system operation is then resumed (green
snowflake icon goes out) and the display will show def
for an additional 10 minutes then return to reading the
inside cabinet temperature. The evaporator fan(s) are
delayed from starting at the termination of the defrost
cycle and will automatically resume by time or temp delay
(5 minutes or 30 0 F coil sensor temperature, whichever
comes first ).
IV. b - FREEZERS (continued):
During freezer defrost operation, heat is confined to the
coil enclosure to prevent any significant rise in tempera-
ture within the food zone. The fan delay control function
upon termination of a defrost cycle is two-fold. First, to
prevent blowing warm air into the food storage area.
Second, to prevent any condensation on the defrost coil
from being blown into the food storage area.
The microprocessor control is set from the factory to termi-
nated defrost at 20 minutes in the event of sensor failure.
This setting should never be tampered with, without first
consulting Traulsen’s Technical Service department.
V. a - CLEANING THE CONDENSER/FILTER:
The most important thing you can do to insure a long,
reliable service life for your Traulsen is to regularly clean
the condenser coil and or filter if provided.
The microprocessor control will notify you through a
“CLN-FIL” message when the condensing temperature of
the refrigerator reaches 140 degrees F or greater. If the
condensing temperature reaches 160 degrees F the com-
pressor will automatically turn off . When the temperature
drops below 140 degrees F the compressor will restart
and when the temperature drops below 120 degrees F
the alarm will reset.
WARNING: DISCONNECT ELECTRICAL POWER SUPPLY
BEFORE CLEANING ANY PARTS OF THE UNIT.
To clean the condenser/filter, first disconnect electrical
power to the cabinet and remove the front louver as-
sembly. To do so, place hands under the louver panel and
pull out and up to get louver panel off bracket of the unit.
See diagram below.
Proceed to vacuum or brush any dirt, lint or dust from
the finned condenser coil/filter, the compressor and other
cooling system parts. If significant dirt is clogging the con-
denser fins or filter, use compressed air to blow this clear.
To replace the louver assembly reverse the process.
-3-
IV. OPERATION
FREEZER
SET
INTELA-TRAUL
°F °C
V. CARE & MAINTENANCE