Exchanging The Refrigerant; Replacing A Compressor - Emerson Copeland Scroll ZR24KRE Application Manuallines

Leak checking shall be carried out with the following frequency:
(a) once per year if the system contains between 5 and <50 tonnes CO
(b) once every 6 months if the system contains between 50 and <500 tonnes CO
(c) once every 3 months if the system contains more than 500 tonnes CO
NOTE: The leak checking frequency can be halved if permanent leak detection systems are
fitted. Permanent leak detection systems are mandatory for system charges of 500 tonnes
CO e and above.
2
NOTE: Hermetically sealed equipment that contains fluorinated greenhouse gases in
quantities of less than 10 tonnes of CO
equipment is labelled as hermetically sealed.
Table 7 below sets out the
▪ F-gas thresholds, in tonnes CO
▪ maximum allowed interval between leak checks for equipment that meets each threshold;
▪ quantities of commonly used HFCs/refrigerant equal to each threshold.
Refrigerant GWP
R134a 1430
R450A 547
R513A 631
R407C 1774
Table 7: F-gas Regulation leak check intervals (based on refrigerant type and system charge thresholds)
The F-gas Regulation contains additional requirements depending on the system and stipulates
training requirements for alternative refrigerants.
HFO refrigerants are covered by the F-gas Regulation as far as reporting of placing on the market
is concerned.

Exchanging the refrigerant

6.3
CAUTION
Low suction pressure operation! Compressor damage! Do not operate
with a restricted suction. Do not operate with the low-pressure limiter bridged.
Do not operate compressor at pressures that are not allowed by the operating
envelope. Allowing the suction pressure to drop below the envelope limit for
more than a few seconds may overheat scrolls and cause early drive bearing
and moving parts damage.
For qualified refrigerants and oils, see Chapter 2.4.1.
It is not necessary to replace the refrigerant unless contamination, for example due to an error such
as topping up the system with a non-condensable gas or incorrect refrigerant, is suspected. To verify
correct refrigerant composition, a sample can be taken for chemical analysis. A check can be made
during shut down by comparing the refrigerant temperature and pressure using precision
measurements at a location in the system where liquid and vapour phases are present and when the
temperatures have stabilised.

Replacing a compressor

6.4
CAUTION
Inadequate lubrication! Bearing destruction! For systems with refrigerant
accumulator, exchange the accumulator after replacing a compressor with a
burned-out motor. The accumulator oil return orifice or screen may be plugged
with debris or may become plugged. This will result in starvation of oil to the
new compressor and a second failure.
Remove the refrigerant and oil completely from the replaced compressor.
AGL_AC_ST_ZRKRE_E_Rev01
e, shall not be subject to leak checks, provided the
2
equivalent, at which leak check intervals are specified;
2
Maximum interval
between leak checks
1 year
5 to <50 T CO e
2
3.49 kg
9.25 kg
7.93 kg
2.81 kg
e;
2
2
Maximum interval
between leak checks
6 months
50 to <500 T CO e
2
34.96 kg
92.5 kg
79.36 kg
28.18 kg
e;
2
e.
Maximum interval
between leak checks
3 months
>500 T CO e
2
349.65 kg
925.92 kg
793.65 kg
281.84 kg
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