Reznor YDHA - Page 23

Form O-Y P/N 273647R5, Page 23
FKDQJHWKH¿OWHUGULHUDQ\WLPHWKHFLUFXLWLVRSHQHG
,WLVUHFRPPHQGHGWRXVHDWXELQJFXWWHUZKHQFXWWLQJRXWD¿OWHUGULHUDVWKH
desiccant absorbs and holds moisture better when it is cool. Heat from a torch may
FDXVHPRLVWXUHWROHDYHWKH¿OWHUDQGEHDEVRUEHGLQWKHRLO%HFDUHIXOWRNHHS
GLUW¿OLQJVDQGRWKHUFRQWDPLQDQWVRXWRIWKHV\VWHP
&RQWLQXHWRStep 5.
IF the oil measured in Step 2ZDVVLJQL¿FDQWO\OHVVWKDQVKRZQLQWKHWDEOHDERYH
or the test for acid in Step 2 did indicate compressor burnout, do the following:
a) ,QVWDOODOLTXLGOLQH¿OWHUGULHU,IWKHUHLVDFLGLQVWDOODQDFLGUHPRYLQJ¿OWHU
GULHU6L]HWKHDFLGUHPRYLQJ¿OWHUGULHUDWOHDVWRQHFDSDFLW\VL]HODUJHUWKDQ
normally required for the circuit.
b) ,QVWDOODWHPSRUDU\¿OWHUGULHULQWKHVXFWLRQOLQH:KHQWKHUHLVDFLGD
DFWLYDWHGDOXPLQDVXFWLRQ¿OWHUGULHULVUHFRPPHQGHG7KHVXFWLRQOLQHGULHU
VKRXOGEHVL]HGSURSHUO\IRUWKHFLUFXLWDQGKDYHDVHUYLFHDFFHVV¿WWLQJWR
PRQLWRUSUHVVXUHGURSDFURVVWKHGULHU127(6XFWLRQOLQH¿OWHUGULHUPXVWEH
removed after 72 hours of operation.)
Step 12 includes the remaining procedures required for cleanup of a burnout.
&RQWLQXHWR6WHS
 Step 5. Braze on Suction and Discharge Lines
CAUTION: Do not leave system open to the atmosphere any longer
than minimum required for installation. POE oil in the compressors is
extremely susceptible to moisture absorption. Always keep ends of
tubing sealed during installation. See Hazard Levels, page 2.
Brazing materials must be able to withstand the high pressure of R-410A
UHIULJHUDQW$KLJKWHPSHUDWXUHVLOYHUSKRVSKDWHW\SHEUD]LQJZLWKRUJUHDWHU
alloy is recommended.
To prevent oxidation, purge tubing with 2-3 psig of regulated dry nitrogen while it
is being brazed. Open the service valve as needed to release the nitrogen. Do not
allow moisture to enter the system.
The installer is responsible for brazing and for complying with appropriate standard
refrigerant piping procedures.
CAUTION: All brazing should be done using a 2-3 psig dry nitrogen
SXUJHÀRZLQJWKURXJKWKHSLSHEHLQJEUD]HG
CAUTION: When brazing, protect all painted surfaces and components
from excessive heat. Wet wrap all valves but do not allow moisture to
enter the tubing. See Hazard Levels, page 2.
 Step 6. Check System for Leaks
After installation is complete, pressurize the circuit with helium or dry nitrogen to
DSSUR[LPDWHO\SVLPD[LPXPSUHVVXUHLVSVL&KHFNIRUOHDNVXVLQJVRDS
bubbles or other leak-detecting methods.
 Step 7. Evacuate the Circuit
Evacuate one circuit at a time. Use a vacuum pump and micron gauge. Each
FLUFXLWPXVWEHHYDFXDWHGWRKROGDPLFURQYDFXXP9DFXXPPXVWEHSXOOHG
RQERWKWKHGLVFKDUJHKLJKDQGVXFWLRQORZVLGH'RWKHVXFWLRQVLGH¿UVWDQG
the compressor discharge side second. To establish that a circuit is leak-free
DQGPRLVWXUHIUHHDVWDQGLQJYDFXXPWHVWLVUHFRPPHQGHG&ORVHRIIWKHYDOYH
to the vacuum pump and observe the micron gauge. If the vacuum gauge does
not rise above 500 microns in one minute, the evacuation should be complete.
If the vacuum gauge does rise above 500 microns in one minute, evacuation
is incomplete or the circuit has a leak. Repeat as needed until evacuation is
complete. The evacuation process must be done on each circuit.
NOTE: Evacuation will not remove moisture from POE oil. Moisture must be
prevented from getting in the oil.
&RQWLQXHDQGRUUHSHDWSteps 6 and 7 until evacuation is complete.
3.7 Compressor
Operation,
Maintenance,
and
Replacement
(cont'd)