Practical Assessment Benchmarks and
Marking Guide
Unit of Competency Code/s:
UEENEEJ052B
Unit of Competency Name/s:
Carry out repairs to appliance refrigeration systems
Name of Practical Task/Project:
Replace condenser / Back panel assembly
Speciality/Stream (if applicable):
Purpose of this form:
Obs#
1.
2.
3.
Observation checklist
item (description)
Recover the refrigerant
Remove condenser and
perform pressure test
Refoam the cabinet
Date: October 2010
These benchmarks support the checklist in QT103 Practical Assessment tool. A
benchmark provides a quantifiable and clearly defined measure for performance
and helps assessors to make objective decisions. Use this form to list the
performance benchmarks in relation to the observation checklist and to provide
answers to verbal and/or written questions asked during the practical
assessment.
Benchmarks
Appropriate tools used to access the system.
Gauges properly fitted.
Presence of refrigerate identified.
Static pressure checked.
Refrigerant recovery equipment set up.
Safe filling capacity of the recovery cylinder correctly calculated.
Refrigerant recovered and recorded in logbook.
Correct PPE and safety information for the removal of the back panel
accessed and applied to the job.
Refrigerator correctly positioned for work and protective covering used to
avoid product damage.
Back panel removed, leaving pipe work connected for pressure testing.
Pipe work diagram used to correctly locate the position of internal joins.
Foam insulation removed, taking care to leave a layer of insulation above
the ABS liner to protect it from heat & bulging when new foam is added.
Dry nitrogen cylinder connected to system and pressure test performed.
Internal joins and repair are leak tested.
Pipe work diagrams and information from service manuals are accessed
for back panel removal.
Back panel successfully removed using appropriate tools and processes.
Loose foam removed from cabinet and triple fold.
Correct PPE and safety information for working with foaming chemicals
accessed and applied to the job.
Correct quantities of activator and resin mixed.
Mixture successfully poured into cabinet voids and other areas, ensuring
pipe work is correctly positioned.
Foam compressed using heavy weighted plate, ensuring a neat job and
strong, well compressed insulation.
Foam allowed setting and excess removed with appropriate tools.
Rear of fridge sealed with wax to prevent moisture migration between
back panel and insulation.
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4.
5.
6.
Fit new condenser/back
panel
Perform pressure and
leak tests
Evacuate and recharge
refrigeration system
Old condenser removed and high pipe work sweated off/cut with
appropriate tools.
High side joins suitably prepared for brazing.
New filter drier connected to system and suitably prepared for brazing.
Valve assembly fitted to the process tube on the new filter drier for
evacuation.
Back panel correctly fitted into position using appropriate tools and
processes.
All external joins brazed and purged with nitrogen.
Connected system to dry nitrogen cylinder.
Pressure tested system to required pressure i.e. 800Kpa
Leak tested all brazed joins using ‘bubble test’.
Correct actions taken in the event of either a leak or no leak.
Connected system to vacuum pump ensuring electronic vacuum gauge is
between vacuum pump and refrigerator.
Evacuated system from both high and low sides to a pressure of 500
microns.
Prepared system for recharging ensuring correct equipment setup.
Refrigerant cylinder weighed and correct refrigerant charge calculated.
Lines purged and refrigerant charged into system.
Run tested the product, checking.
Process pipes crimped off and sealed.
Conducted electrical safety tests and tagged the product.
Correctly filled in all required information on the service job card:
7.
Complete service records







Customer details
Job Number
Product details (model ,serial no etc)
Fault description
Diagnosis and work completed
Parts used (including part numbers)
Consumables (Gas & Solder)
Calculated job cost.
Verbal / Written questions
Q#
Answers to verbal / written questions asked during the practical assessment:
8.
9.
10.
11.
12.
Date: October 2010
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