Danfoss VZH117AGANA Variable Speed Scroll Compressor

Danfoss VZH117AGANA is a 2nd-generation variable speed scroll compressor with a displacement of 116.9 cm³. It adopts IPM Interior Permanent Magnet synchronous motor, designed for R410A refrigerant systems. Rated voltage range: 380-480V/3PH/50-60Hz, cooling capacity: environ. 8~11 tons of refrigeration. Its core advantages include high efficiency across full speed range (≥92%), wide frequency adjustment (25-100Hz), precise temperature control (±0.5°C) and low vibration & faible bruit. It is ideally applied to commercial air conditioners, precision air conditioners, heat pump systems and combined parallel systems, which can effectively boost system energy efficiency (energy saving over 30%) and reduce operating costs.

1. Définition du code modèle

Numéro de commande: 120G0014 (single package)

2. Main Technical Specifications

3. Full VZH Series Model List (R410A)

Modèles spéciaux:

VZH117CGANA (industrial package, 120G0226)

VZH117CJDMA (compatible with R452B/R454B, 120G0327)

4. Remplacement & Modèles équivalents

4.1 Internal Danfoss Replacement

4.2 Cross-brand Equivalent

5. Scénarios d'application & Cas industriels

5.1 Applications recommandées

5.2 Not Recommended Applications

Household air conditioners (excessive power for residential use)

Systems using chlorine-containing refrigerants (only R410A applicable)

Oil-free lubrication systems (POE oil lubrication required)

Ultra-high pressure working conditions (exceeding 48.7bar high-side limit)

5.3 Practical Cases

Cas 1: Precision Air Conditioner Renovation for Data Center

Original system: Fixed-speed compressor, high power consumption, large temperature fluctuation

Solution: VZH117AGANA + CDS303 dedicated inverter

Effect: Energy consumption reduced by 35%, temperature fluctuation controlled within ±0.3℃, annual electricity cost saved about 120,000 RMB

Cas 2: Rooftop Unit Project for Commercial Complex

Demande: 24-hour continuous operation with wide load fluctuation (10%-100%)

Solution: Parallel system composed of 4 sets VZH117AGANA compressors

Effect: Part-load efficiency increased by 40%, starting current reduced by 70%, longer service life

6. Air Shipment Compliance & Certification Guide

6.1 Air Transport Confirmation

6.2 Certification Documents

CE Certificate: Available on Danfoss official product page

UL Certificate: Apply via Danfoss global product store

Manufacturer Declaration: Including RoHS, REACH compliance statement

7. Règles de sélection
8. Capacity matching: VZH117AGANA equals 8-11TR, suitable for 1000-2000㎡ commercial space
9. Voltage selection: G code for 380-480V, J code for 200-240V
10. System matching: Must use original Danfoss CDS303 inverter
11. Lubrication rule: Only original POE 160SZ refrigeration oil is allowed
12. Installation standard: Suction pipe 1 3/8 inch, discharge pipe 7/8 inch, brazed connection
13. Accessoires assortis

Défauts courants & Troubleshooting for Danfoss VZH117AGANA Variable Speed Scroll Compressor

1. Failure to Start & Inverter Alarm

Symptôme: No operation after power on, inverter alarms overcurrent, perte de phase, overload or undervoltage

Causes

1. 3-phase power phase loss, unstable low voltage
2. Wrong inverter parameter setting
3. Internal scroll seizure or bearing stuck
4. Loose main circuit wiring, poor contactor performance
5. Damaged inverter power module

Solutions

1. Measure actual 3-phase voltage, keep stable voltage at 360~420V
2. Reset standard parameters: 4-moteur à pôles, rated current 44A
3. Manually rotate fan wheel, disassemble and repair if stuck
4. Fasten all wiring terminals, replace aging contactors
5. Repair or replace original Danfoss CDS302/CDS303 inverter
6. Excessive Operating Current & Frequent Overload Protection

Symptôme: Running current far exceeds 44A, easy to trip under high frequency

Causes

1. Overcharged refrigerant leads to excessive system load
2. Dirty condenser causes poor heat dissipation and high high-side pressure
3. Température ambiante trop élevée
4. Long-term full-load high-frequency operation
5. Liquid slugging increases operating resistance

Solutions

1. Recycle redundant R410A refrigerant to standard filling quantity
2. Clean condenser fins thoroughly
3. Install unit away from heat source
4. Set maximum speed limit on inverter
5. Install gas-liquid separator to avoid liquid refrigerant return
6. Excessively High Discharge Temperature (Over 135℃)

Symptôme: High temperature shutdown, sharp cooling capacity drop

Causes

1. Insufficient refrigerant leads to superheated suction gas
2. Abnormal expansion valve opening
3. Insufficient outdoor fan speed and air volume
4. System partial blockage
5. Long-term low-frequency light-load operation

Solutions

1. Supplement R410A refrigerant and check leakage points
2. Adjust expansion valve opening matching actual load
3. Repair outdoor fan to reach rated speed
4. Flush pipeline to remove dirt blockage
5. Adjust operating frequency range reasonably
6. Abnormal Noise & Severe Vibration

Symptôme: Loud operating noise, unit shaking and pipeline resonance

Causes

1. Aging shock absorption pad, uneven installation base
2. No flexible vibration-absorbing pipe on suction/discharge pipeline
3. Insufficient refrigeration oil causes internal wear
4. Liquid slugging impact scroll components
5. Loose compressor fixing bolts

Solutions

1. Replace thickened shock pad and level installation base
2. Install refrigeration vibration-absorbing hose on high/low pressure pipelines
3. Check and replenish POE refrigeration oil regularly
4. Add gas-liquid separator to avoid liquid slugging
5. Fasten all fixing bolts and arrange pipelines properly
6. Insufficient Cooling Capacity & Weak Frequency Rising

Symptôme: Slow cooling speed, no capacity improvement after frequency rise

Causes

1. Abnormal pressure sensor signal
2. Low inverter output torque parameter
3. Air remaining inside system, incomplete vacuum pumping
4. Internal scroll wear leads to low volumetric efficiency
5. Blocked filter causes insufficient circulation flow

Solutions

1. Calibrate pressure transmitter zero point and range
2. Increase inverter torque gain parameter
3. Re-pump deep vacuum to exhaust internal air
4. Replace compressor if serious wear occurs
5. Replace filter drier and dredge pipelines
6. Frequent Start-Stop Cycle

Symptôme: Excessive start-stop times exceeding 12 fois par heure

Causes

1. Too narrow temperature & pressure control differential value
2. Severe system pressure fluctuation
3. Unstable grid voltage
4. Over-low protection threshold causes false shutdown

Solutions

1. Widen temperature and pressure start-stop differential range
2. Stabilize system refrigerant pressure and optimize throttling control
3. Install voltage stabilizer for 3-phase power supply
4. Properly raise protection threshold to eliminate false protection
5. Lubrication System Fault

Symptôme: Fast internal wear, short service life and frequent abnormal noise

Causes

1. Failure of first oil change after 500 working hours
2. Mixed use of non-specified refrigeration oil, oil deterioration
3. Unbalanced oil distribution in parallel units
4. Poor oil fluidity under long-term low-temperature operation

Solutions

1. Strict maintenance rule: first oil change at 500h, regular change every 2000h / 1 année
2. Only use designated Danfoss POE 160SZ refrigeration oil, prohibit mineral oil mixing
3. Check oil balance pipeline smoothness
4. Preheat unit before loading under low ambient temperature
5. Refrigerant Leakage Fault

Symptôme: Gradual system pressure drop, worse cooling effect

Causes

1. Vibration crack on ODF brazed welding seam
2. Loose sealing of oil balance connector
3. Pinhole leakage on compressor shell
4. Pipeline joint desoldering caused by thermal expansion and contraction

Solutions

1. Pressurize for leakage detection and re-weld cracked joints
2. Fasten oil balance connector and replace sealing gasket
3. Use special leak repair agent for slight shell leakage, replace compressor for severe leakage
4. Reserve expansion margin for pipelines to reduce thermal stress
5. Out-of-control Variable Speed Regulation

Symptôme: Unstable rotating speed, no response to speed command

Causes

1. Signal interference between inverter and main control board
2. Abnormal built-in motor Hall sensor
3. Inverter control board program disorder
4. Grid frequency fluctuation affects variable speed output

Solutions

1. Shield and ground communication wire, keep away from high-power power lines
2. Inspect Hall signal of permanent magnet motor
3. Restore inverter factory settings and re-match compressor parameters
4. Stabilize grid power frequency
5. Daily Maintenance Precautions
6. Do not use non-original universal inverter, easy to burn out motor without built-in protection
7. Only adopt R410A refrigerant, no alternative refrigerant allowed
8. Control start-stop times ≤12 times per hour to extend service life
9. POE oil has strong water absorption, complete vacuum pumping and sealing required after maintenance
10. Ensure sufficient condenser heat dissipation under high temperature summer working condition