Stoelting E157, Service Manual

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30
WARNING
DISCONNECT FREEZER FROM ELECTRICAL
SUPPLY SOURCE BEFORE SERVICING.
1. Remove the necessary panels. Model E257 back and
side panels. Model E157 back panel and back shroud.
2. Disconnect lead wires at the compressor.
3. Recover refrigerant charge, then leave a port open to
prevent pressure build-up during compressor removal.
4. Unsweat the suction line and discharge line from the
compressor (Fig.44).
7.5 COMPRESSOR INSTALLATION
To install a serviceable compressor, perform the following
procedures:
WARNING
DISCONNECT FREEZER FROM ELECTRICAL
SUPPLY SOURCE BEFORE SERVICING.
ASSUMING THE SIDE AND BACK PANELS HAVE
BEEN REMOVED FOR COMPRESSOR REMOVAL
AND THE ENTIRE REFRIGERATION SYSTEM
PURGED THOROUGHLY, YOU CAN BEGIN IN-
STALLING A NEW COMPRESSOR.
WARNING
IF ACID IS FOUND IN THE SYSTEM, CLEAN OUT
PER COMPRESSOR MANUFACTURER’S IN-
STRUCTIONS.
2. Install the four rubber compressor mounts on the
replacement compressor.
3. Remove all plugs from the replacement compressor.
4. Braze the access fitting line to the correct compressor
port, using the appropriate brazing material.
5. Install the compressor into the freezer, from the left
side, fitting the base over the four mounting studs.
6. Install the four washers and four nuts onto the mounting
studs and tighten securely.
7. Leaving a port open to prevent pressure build-up, braze
the suction line and discharge line to the compressor
(Fig.45).
NOTE
Cap and valve must be removed.
Figure 44. Compressor Removal
5. Remove the four nuts and four washers from the base
of the compressor.
6. Remove compressor through left side of the freezer.
7. Remove the four rubber compressor mounts from the
old compressor.
NOTE
Rubber mounts are not always furnished with re-
placement compressors.
8. Unsweat the access fitting line from the compressor.
9. Check the compressor for a burn-out condition using an
acid test kit. If acid is found, clean out the system
per the compressor manufacturer’s instructions.
10.Sweat shut all open ports of the old compressor.
NOTE
A compressor returned to the company with any
open ports will void the warranty. ALWAYS plug any
open ports on a compressor that has been removed.
Suction Line
Discharge
Line
Ç Ç Ç Ç Ç
Ç Ç Ç Ç Ç
Open
Port
Ë Ë Ë Ë Ë
Figure 45. Install Compressor
8. Connect the lead wires to the compressor. Replace the
terminal cover and retaining clip.
9. Evacuate the refrigeration system to 50 microns of
mercury for approximately 30 minutes.