System Clean-Up; Heater Test/Drawer Perimeter Heater; Electrical Operation; Sequence Of Operation/Defrost Mode - Traulsen TE Series Service Manual

VI. SERVICE PROCEDURES & ADJUSTMENTS (cont'd)
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE
NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
VI. f - SYSTEM CLEAN UP/INTRODUCTION (cont'd):
MASSIVE CONTAMINATION
The replacement compressor MUST NOT be installed
until after system clean-up procedures have been
completed.
1) Remove the burned-out compressor as outlined
under "COMPRESSOR" in "Section IV. f".
2) Remove the capillary tube metering device.
3) Purge nitrogen through the high and low sides of
system until moisture and contaminated oil has been
removed from the remaining components of the
system.
4) Reassemble refrigeration system and add a CW style
liquid drier and a suction line drier.
5) Purge nitrogen through the high and low sides of
system for 5 minutes.
6) Evacuate refrigeration as outlined under
"EVACUATING SYSTEM" for 30 minutes. Repeat
nitrogen purge and evacuate two more times.
7) Charge system as outlined under "CHARGING
SYSTEM". Allow for the increased liquid capacity of
the liquid line drier.
8) Reconnect power and check for proper operation.
9) Disconnect power and install any panels removed.
VII. a - NORMAL OPERATION:
1. Conditions
a) Unit connected to correct voltage (check using a
volt meter).
b) Microprocessor off cycle defrost settings correct.
c) Condensing unit controlled by the microprocessor
control.
d) Cabinet at desired temperature.
e) Door perimeter heaters are powered 100% of the
time as preset by the factory (this can be adjusted
using the microprocessor control).
f) Evaporator fan powered.
g) Microprocessor control operating correctly.
2. Cabinet temperature rises above set temperature.
a) Microprocessor control initiates compressor
operation.
b) Evaporator fan should be ON all the time.
3. Set temperature is met.
a) Conditions return to those outlined in step 1.
VII. ELECTRICAL OPERATION
-14-
MASSIVE CONTAMINATION (cont'd):
10) Return between 24 and 48 hours to recover gas,
replace liquid line drier with a CW style drier. Remove
the suction drier, but do not replace.
11) Evacuate and charge system as outlined under
"EVACUATING SYSTEM" and "CHARGING SYSTEM .
VI. g - HEATER TEST - DRAWER PERIMETER HEATER:
1) Access the heater wire around the drawer frame.
2) Plug the unit in and verify 120 volt supply to the
heater.
3) The reading should be .25 amp.
VII. b - DEFROST MODE:
1. Conditions
a) Unit operating in normal mode.
2. Defrost initiated by the microprocessor control (an
off-cycle defrost should occur every 60-minutes).
3. Defrost terminated by either: 1) Evaporator Coil
Temperature or 2) Maximum Set Time Interval.
4. Cabinet returns to normal operation.
a) Temperature controlled by the microprocessor
control.
b) Evaporator fan stays ON, evaporator coil will reach
desired temperature.