Liebherr freezer LGT 4725 MediLine Manual

The Liebherr LGT 4725 MediLine is a premium upright freezer designed for medical and laboratory applications, featuring precise temperature control, high storage capacity, alarm systems, and energy-efficient operation. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Temperature Management 7. Alarm Systems 8. Maintenance & Cleaning 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Digital temperature display, adjustable shelves, door alarm, key lock, castors for mobility, and medical-grade insulation.

Feature	Description
Digital Temperature Display	Shows current internal temperature with precision
Adjustable Shelves	Flexible storage configuration for various sample sizes
Door Alarm	Audible alert if door is left open
Key Lock	Security lock for controlled access
Castors	Mobility with locking wheels
Medical-Grade Insulation	Enhanced temperature stability and energy efficiency
Temperature Alarm	Visual and audible alarm for temperature deviations
Energy Saving Mode	Reduces power consumption during low-usage periods
Fast Freeze Function	Rapid temperature reduction for new contents
Data Interface	Optional connection for temperature monitoring systems

Installation

Unpack and inspect contents. Ensure proper ventilation and level placement.

Positioning: Place on stable, level floor with at least 10cm clearance on all sides for ventilation.
Power Connection: Connect to dedicated grounded outlet (220-240V, 50Hz).
Initial Standby: Allow unit to stand upright for 24 hours before first power-on if transported horizontally.
Castor Adjustment: Lock wheels if unit needs to remain stationary.

WARNING! Unit is heavy; use appropriate lifting equipment or multiple persons. Ensure electrical supply matches specifications.

First-Time Setup

Power on freezer; follow initial configuration steps.

Temperature Setting: Use control panel to set desired temperature (typically -20°C to -25°C for medical storage).
Alarm Configuration: Set temperature alarm thresholds and door alarm delay.
Shelf Arrangement: Adjust shelves according to storage needs.
Fast Freeze Activation: Activate Fast Freeze function for initial cool-down or when adding large loads.

CAUTION! Do not overload shelves beyond specified weight limits. Allow temperature stabilization before storing sensitive contents.

Specifications

Model: LGT 4725 MediLine
Capacity: 472 liters total volume
Temperature Range: -10°C to -30°C (adjustable)
Climate Class: SN-T (10°C to 43°C ambient)
Power Supply: 220-240V, 50Hz
Annual Energy Consumption: 365 kWh (approx.)
Refrigerant: R600a (isobutane)
Dimensions (HxWxD): 1850 x 700 x 700 mm
Weight: 98 kg (empty)
Noise Level: ≤ 42 dB(A)

Controls and Settings

Access control panel on front display. Main Controls: Power On/Off, Temperature Setting, Alarm Reset, Fast Freeze, Energy Saving Mode.

Display Indicators: Current temperature, Set temperature, Alarm status, Door open warning, Fast Freeze active.

Temperature Setting: Use + and - buttons to adjust in 1°C increments. Alarm Settings: Configure high/low temperature limits via menu (default ±3°C from set point). Door Alarm Delay: Adjustable from 1 to 10 minutes. Key Lock: Turn key to lock/unlock door and control panel.

Temperature Management

For optimal performance and sample integrity.

Regular Monitoring: Check displayed temperature daily.
Loading Procedure: Pre-cool items when possible; use Fast Freeze for large loads.
Door Management: Minimize opening duration and frequency.
Defrosting: Automatic defrost system; ensure drain channel is clear.

Tip: Maintain temperature log for quality assurance compliance.

Alarm Systems

Visual and audible alarms for critical conditions.

Alarm Type	Trigger Condition	Response Action
High Temperature	Temperature exceeds set limit	Check door seal, power supply; move contents if needed
Low Temperature	Temperature falls below set limit	Adjust temperature setting; check sensor
Door Open	Door ajar beyond set delay	Close door securely
Power Failure	AC power interruption	Check circuit breaker; implement backup plan

Alarm Silence: Press Alarm Reset button; alarm will re-trigger if condition persists.

Maintenance & Cleaning

Unplug before maintenance. Regular cleaning ensures hygiene and efficiency.

Interior Cleaning: Remove contents; clean with mild detergent and warm water; dry thoroughly.
Exterior Cleaning: Wipe with damp cloth; avoid abrasive cleaners.
Door Seal: Check and clean regularly; ensure proper sealing.
Condenser: Vacuum dust from rear grille every 6 months.

CAUTION! Never use sharp tools to remove ice. Do not use steam cleaners.

Regulatory Information

CE marked for medical devices (93/42/EEC). Complies with IEC 60601-1-2 for electromagnetic compatibility. Manufactured according to ISO 13485. Refrigerant charge: 65g R600a. For support, visit www.liebherr.com or contact local Liebherr service center.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Unit not cooling	Power supply, door seal	Check power connection; ensure door closes properly; verify temperature setting
Alarm sounding	Temperature deviation, door ajar	Check temperature display; close door; press Alarm Reset
Excessive frost	Frequent door openings, poor seal	Minimize door openings; check door seal; ensure automatic defrost functioning
Unusual noise	Leveling, component vibration	Ensure unit is level; check for loose panels; verify nothing touching compressor
Display not working	Power, control board	Check power supply; contact service if display remains blank

Reset: Disconnect power for 5 minutes, then reconnect to reset control system.

Service: Contact authorized Liebherr service center. Do not attempt repairs involving refrigerant system.