Page 4
CAUTION: The compressor may contain harmful acids—-be sure to handle with extreme care using
proper protection equipment. fter confirming oil charge level, return oil to compressor and install suc-
tion and discharge rotalock caps. Copper tube fittings should be brazed closed. This is needed to pre-
vent further contamination of the compressor and to prevent spillage from the compressor.
3. MOUNT THE NEW COMPRESSOR. Do not remove dust cover or rubber shipping plugs until all other connec-
tions have been completed (i.e., filters installed and all tubing changes made—-see steps 4, 5 and 6). gain, the
compressor should not be open to the atmosphere for more than 15 minutes. Be sure to use the new mounting
grommets that were shipped with the compressor. If the mounting sleeves shipped with the compressor are
used, the mounting bolts will bottom out when tight. Use care not to over-compress the mounting grommets
when the mounting sleeves cannot be used.
4. Install the proper discharge muffler if the system does not have one. Refer to Tables 3 and 4 on page 12 to con-
firm if the replacement compressor requires a discharge muffler and the size required. H22J and R92J com-
p esso s have an inte nal muffle , the efo e, the tables do not apply to these two models.
5. INSTALL FILTER DRIERS. Bristol Compressors recommends the use of new adequately sized liquid and suc-
tion line driers anytime a compressor is replaced. If the new compressor is to be used to replace a compressor
with a burned motor, the use of a high acid neutralizing filter drier is recommended. Fo heat pumps, a suction
filte d ie must be installed between the accumulato and the comp esso suction inlet. In addition, a bi-
di ectional heat pump liquid line d ie o facto y ecommended d ie s must be installed. NOTE: AL-
WAYS REMOVE OLD FILTER DRIERS.
6. BRAZE ON SUCTION AND DISCHARGE LINES. Flow an inert gas, such as nitrogen or CO
2
, through the sys-
tem at approximately 1/4 to 1 psig. This will reduce the possibility of oxidation inside the tubing. Braze on the
suction and discharge lines and braze the process tube shut following the recommendation listed below. Note:
The process tube has been eliminated on most compressors.
COPPER TUBING: If additional copper tubing is required, use only clean, dehydrated refrigeration grade
tubing with sealed ends.
BRAZING ALLOYS: CAUTION: Do not use 95/5, 50/50 o 40/60 soft solde fo b azing. Use Sil-Fos
or Phos Copper, or similar brazing alloys with high tensile strength on copper welds
only. Weld steel to copper only with silver brazing alloys.
BRAZING PROCEDURE: To ensure properly brazed joints, Bristol Compressors recommends that the following
steps be used:
a. Exercise extreme care when cutting and forming tubes to keep dirt, filings, and
other contaminants from entering the system.
b. Do not use excessive amounts of brazing alloy as some of the excess may pene-
trate the joint and enter the system.
c. If flux must be used, take necessary precautions to ensure that the flux does not
enter the system.
d. Use damp cloths or other heat absorbent material to ensure that the factory-
brazed joints on the compressor do not become damaged. If damp cloths are
used, take care not to allow moisture to enter the system.
e. Do not overheat brazed joints as excess heat will cause formation of copper oxide
on the inside wall of the tubing. Flow an inert gas through the system, as ex-
plained above.
7. CHECK SYSTEM FOR LEAKS. fter installation is complete, pressurize the system to 75 psig using nitrogen
and a few ounces of system refrigerant. Check for leaks using a halide torch, soap bubbles or an electronic
halogen leak detector. When all connections test satisfactorily, release pressure using proper recovery proce-
dures, then proceed to next step.
