True Ice Series User Manual

TRUE ICE SERVICE MANUAL truemfg.com
TEC_TM_198 | REV. A | EN
P#857284
03/26/2024 Page 76 of 96
Troubleshooting & Diagnosis
Transducer Diagnosis
Read voltage between the black and white wires at the control board. See fig. 1
Compressor Diagnosis
Low Pressure Transducer
VDC PSI
0.5 0
1.0 25
1.5 50
2.0 75
2.5 100
3.0 125
3.5 150
4.0 175
4.5 200
High Pressure Transducer
VDC PSI
0.5 0
1.0 50
1.5 100
2.0 150
2.5 200
3.0 250
3.5 300
4.0 350
4.5 400
Fig. 1. Measure between the black and white wires.
White Black
USER ACTION!
Do not unsolder a defective component. Cut defective components out of the refrigeration system.
1. Check the resistance between the compressor terminals.
a. Single Phase
i. Disconnect power.
ii. Remove the wires from the compressor terminals.
iii. Check the resistance between C and S, C and R, and S
and R.
NOTICE ›
When added together, the resistance values
between C and S and between C and R should equal the
resistance value between S and R
NOTICE ›
If there is a resistance reading between S and
R with open readings between C and S and between C
and R, then the overload is open.
iv. Let the compressor cool. Then, check the readings again.
b. Three Phase
i. Disconnect power.
ii. Remove the wires from the compressor terminals.
iii. Check the resistance between L1 and L2, L2 and L3, and
L3 and L1.
NOTICE ›
The resistance values should all be equal.
NOTICE ›
If there are open readings between L1 and
L2, L2 and L3, and L3 and L1, then the overload is open.
iv. Let the compressor cool. Then, check the readings again.
2. Check motor windings to ground.
a. Check continuity between all three terminals and the
compressor shell or copper refrigeration line.
NOTICE ›
If continuity is present, the compressor
windings are grounded and the compressor should be
replaced.
NOTICE ›
Scrape the metal surface to get good contact.
3. Verify compressor pulls locked rotor amps.
a. Try to start the compressor with a start cord or a correctly
sized 3N1.
NOTICE ›
Always check if the voltage drops below the
name plate voltage.
i. If the compressor starts, then replace all start components.
ii. If the compressor does not start, then replace the
compressor.

True Ice Series Specifications

General

Brand	True
Model	Ice Series
Category	Commercial Food Equipment
Language	English