Zanotti Zer0 120

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Zanotti Transblock USA Corp.

1810 underwood Blvd

Delran, NJ 08028

Attn: Service Department

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T-gostynski@zanotti.com

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Contents3
Table of Contents5
Table of Figures7
General Satefy Notices8
Specific Warning and Caution Statements10
Contents11
Specifications12
Z120 Maintenance Schedule13
SECTION 1 - Unit Description14
- Condensing Section14
- Evaporator Section16
- Microprocessor and Control Box17
SECTION 2 - Unit Identification19
- Deciphering the Model Code19
- Figure 5 - Unit Identification Tag19
- Deciphering the Serial Number20
SECTION 3 - Operation21
- Safety Devices21
- Refrigeration Circuit21
- Control System26
- Start up28
- Alarm Management29
- Microprocessor Parameters31
SECTION 4-System Maintenance34
- General Categories34
- Installing the Manifold Gauge Set34
- Removing the Manifold Gauge Set35
Removing the Refrigerant Charge35
Figure 11 - Refrigeration Gauge Components35
Refrigerant Leak Checking36
Evacuation and Dehydrayion36
- Preparation36
- Procedure for Evacuation and Dehydrating the System36
- Figure 12- Vacuum Pump Connections36
Charging the Refrigeration System37
Figure 13- Refrigeration Gauge Connection37
Low Side Pump down38
Checking the Refrigerant Charge38
Checking and Replacing Filter-Drier39
Checking Filter-Drier39
Replacing the Filter-Drier39
Figure 14 - Sight Glass Inspection39
Figure 15 - Filter / Drier39
Pressure Switches40
- Removing Switches40
- Testing Pressure Switch40
- Figure 16 - Nitrogen Test Setup40
- Compressor41
- Removal41
- Installation41
- System Compressor and Oil41
- Adding Extra Oil to the System41
- Checking the Oil Level41
- Figure 17 - Compressor Oil Sight Glass41
Hot Gas & Condenser Solenoid Valve & Coils42
- Diagnosis of Solenoid Coils42
- Diagnosis of Solenoid Valves42
- Replacing Solenoid Coil43
- Figure 18 - Solenoid Valve Components43
- Replacing Valve Internal Parts44
Figure 19 - Brazing Example44
Brazing Procedures44
- Figure 20 - Expansion Valve Components45
- Figure 21- TXV Location Drawing45
- Expansion Valve Superheat Check & Adjustment46
- Figure 22 - Equalizer Line and Evaporator Outlet46
- Figure 23 - Superheat Test Connections46
- Diagnosing Expansion Valves47
- Replacing Expansion Valve47
Thermostatic Expansion Valve45
Figure 24 - Correct TXV Bulb Placement47
Figure 25 - CPR Valve Components47
Adjusting the Cpr Valve47
Figure 26 - CPR Valve Adjustment48
Testing Defrost System48
Structural Maintenance49
- Unit Inspection49
- Evaporator Coil49
- Electrical Maintenance50
SECTION 5 - Diagnosis52
- Troubleshooting Topics52
- Troubleshooting by Symptom54
- Troubleshooting by Alarm Code60
SECTION 6 - Temperature and Pressure63
- Vapor Temp/Pressure Relationship63
- Pressures at 100⁰F Ambient64
Section 7 - Parameter Values64
- Parameter Issues64
  - Common Parameter Issues64
- SETTING VALUES Single-Temperature - R404A/R134A - Without Stand-By Option65
- SETTING VALUES Single-Temperature - R404A/R134A - with Stand-By Option66
SECTION 8 - Wiring Diagrams67
- Z1001N Rev.268
- Z1006 Rev.269
- Z1006N Rev.370
- Wiring Diagram Key73

Zanotti Zer0 120 - Page 4

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