Figure 73: Leak test hold time
Conducting the optional trace gas leak test
1. Install a high-quality high-resolution analog pressure gauge on one of the shells to monitor
the system pressure over time. Ensure that the pressure gauge has a resolution of 2 psi
increments with a dial face at 3 in. (7.6 cm) in diameter or greater.
2. Before proceeding, check that the unit is at the initial evacuation level of 5 mmHg.
WARNING
To prevent freezing of any moisture that may be in the system, do not go below 5 mmHg. See
System evacuation for more details.
3. With the system evacuated, charge with a vapor only for a 10% trace gas (R-134a) into the
chiller until the system pressure reaches 10 psig (69 kPa).
Note:
- When using a refrigerant based trace gas, you must always charge with vapor only to
reach the initial 10 psig pressure.
- The use of trace gas must adhere to local policies in regards to venting or recovery of
the gas. This is dependent on the gas that is selected.
YMC
2
Mod B with OptiView Control Center
148
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