ClimaCool SHC onDEMAND 30, 50, 70, 85 Manual - Manual (Page 28)

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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
–Š‡•’‡ ‹Ƥ Œ‘„•—„‹––ƒŽ•Š‡‡–•Ǥ
• All parameters can be found in the FN 2 menu
(setup), FN 6 menu (module factory settings), FN 7
menu (service), FN 8 menu (master factory settings).
• It is imperative to access EVERY MENU and EVERY
PARAMETER to ensure all settings are appropriate.
20. Set up the Building Automation System (BAS) interface
parameters (as required) using the FN 0 menu (network
number selection, IP addressing), FN 4 menu
(device instances).
†Œ—•–‹‰‹–Šƒ”‰‡ƒ†š’ƒ•‹‘ƒŽ˜‡•
Using Subcooling and Superheat Method
Due to varying installation conditions/applications and
to optimize performance, proper refrigerant charge and
‡š’ƒ•‹‘˜ƒŽ˜‡ȋȌƒ†Œ—•–‡–—•–„‡ ‘Ƥ”‡†Ǥ
After start up and checking compressor rotation, choose a
‹” —‹––‘„‡–‡•–‡†Ƥ”•–Ǥ‘‡ ––‡•–‡“—‹’‡––‘‘‹–‘”
the suction 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
–”‹’’‹‰ǡ”—–Š‡ ‘’”‡••‘”ˆ‘”Ƥ˜‡‹—–‡•Ǥ
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
•›•–‡Ǥ†† Šƒ”‰‡ƒ†™ƒ‹–Ƥ˜‡‹—–‡•„‡ˆ‘”‡ Š‡ ‹‰
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 6-12°F at normal operating conditions
(typically 44
o 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 to rise.
ƒ‹–Ƥ˜‡‹—–‡•„‡ˆ‘”‡ Š‡ ‹‰–Š‡”‡•—Ž–•‘ˆ–Š‹•ƒ†Œ—•–‡–Ǥ
Repeat until the desired superheat is achieved.