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18. Verify proper communications from each module back
to the master controller using the “STATUS” menu, then
indexing down to the desired compressor data screen.
• If the compressor data parameters all read “0,”
then communications are not yet established, and
communications cable troubleshooting is required.
• When all compressor data parameters read actual
values which agree with the refrigerant gauge set and
refrigerant line temperatures, then it is safe to assume
that communications are established.
19. Set up the master controller parameters according to
•It is imperative to access EVERY MENU and EVERY
PARAMETER to ensure all settings are appropriate.
20.
number selection, IP addressing), FN 4 menu
Adjusting Unit Charge and Thermal Expansion
Valves Using Subcooling and Superheat Method
Due to varying installation conditions/applications and
to optimize performance, proper refrigerant charge
After checking compressor rotation, choose a circuit to be
line and liquid line temperatures simultaneously. Place a
manifold gauge set on the suction line and liquid line then
start the compressor. As long as the suction pressure is high
enough to prevent the low pressure switch from tripping,
Verify proper subcooling. This is accomplished by
subtracting the liquid line temperature from the saturated
condensing temperature. The saturated condensing
temperature is found by converting the liquid line pressure
reading on the manifold gauge to the related temperature.
The normal subcooling temperature range at the condenser
is 5-15°F, BUT for total accuracy please follow the charge
recommendations found in the selection program. If
subcooling is too low, then refrigerant must be added to the
results. If subcooling is too high, then refrigerant must be
removed from the system.
Verify proper superheat by subtracting the saturated
evaporative temperature from the suction line temperature.
The saturated evaporative temperature is found by
converting the suction pressure reading on the manifold
gauge to the related temperature. The proper superheat
temperature range is 6-18°F at normal operating conditions
oF
leaving chilled water temperature). If
superheat is low, this may indicate that the expansion valve
is overfeeding. To adjust the expansion valves, turn the
adjustment stem clockwise. This will cause the superheat
adjustment. Repeat until the desired superheat is achieved.
Once adjusted, also check the discharge gas superheat
discharge line temperature is not more that 220°F. To
condensing temperature by converting the discharge
pressure to saturated refrigerant temperature using a
pressure temperature chart. Next, measure the discharge
line temperature 6 to 10 inches from the compressor.
Subtract the saturated condensing temperature from
superheat. If the DGSH is below 50°F, liquid refrigerant
is still present in the suction gas vapor returning to the
adjustment to raise the discharge gas superheat into the
acceptable range.
Startup
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