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Under no circumstances shall potential sources of ignotion be used in the searching for or detection of refrigerant
leaks.
The following leak detection methods are deemed acceptable for all refrigerant systems:
•
Electronic leak detectors calibrated for R454B
•
Bubble method
•
Fluorscent method agents
If a leakage of refirgerant is found which requires brazing, all of the refrigerant shall be recovered from the system,
or isolated (by means of shut off valves) in a part of the system remote from the leak.
9.2 Servicing
•
If repairs must be made after system is charged, properly and safely remove or isolate refrigerant and purge
the section of the system needing repair with Nitrogen gas or oxygen free nitrogen prior to opening the circuit.
•
The REFRIGERANT CHARGE shall be recovered into the correctly marked recovery cylinders.
•
Ensure that the outlet for the vaccum pump is not close to any potential ignition sources and the ventilation is
available.
•
Prior to recharging the system, it shall be pressure-tested with the appropriate purging gas. The system shall
be leak-tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out
prior to leaving the site.
•
Ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of
cylinders for holding the total system charge is available. Only use cylinders designated for the recovered
refrigerant and labelled for the refrigerant. Cylinders shall be complete with pressure-relief valve and
associated shut-off valves in good working order.
•
A set of caliberated weighing scales shall be available and in good working order. Hoses shall be complete
with leak-free disconnect couplings and in good condition. Ensure any associated electrical components are
sealed.
•
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder. Do not
mix refrigerants.
•
If compressors or compressor oils are to be removed, ensure that they have been evacuated to an
acceptable level to make certain that FLAMMABLE REFRIGERANT does not remain within the lubricant.
Section 10. Service Valves
10.1 Open the Gas Service Valve
Important: Leak check and evacuation must be completed before opening the service valves.
NOTE: Do not vent refrigerant gases into the atmosphere.
STEP 1 - Remove valve stem cap.
STEP 2 - Using an adjustable wrench, turn valve stem 1/4 turn counterclockwise to the fully open position.
STEP 3 - Replace the valve stem cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
10.2 Open the Liquid Service Valve
Extreme caution should be exercised when opening the Liquid Line Service Valve. Turn counterclockwise until
the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in
abrupt release of system charge and may result in personal injury and /or property damage.
Important: Leak check and evacuation must be completed before opening the service valves.
STEP 1 - Remove service valve cap.
STEP 2 - Fully insert 3/16" hex wrench into the stem and back out counterclockwise until valve stem just touches
the rolled edge (approximately five (5) turns.)
STEP 3 - Replace the valve cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
10
WARNING
!
88-A5AC5001-1A-EN
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