Sealed System Troubleshooting / Diagnostic Tables; Normal Operating Pressures Table; Pressure Indications Table; Sealed System Troubleshooting / Diagnostics Tables - Sub-Zero 700-3 BASE Technical & Service Manual

Troubleshooting Guides

SEALED SYSTEM TROUBLESHOOTING / DIAGNOSTICS TABLES

Before tapping into the sealed system to check pressures, see General Troubleshooting Guide, taking note of prob-
lems "A" through "J", and if applicable, be sure to reference the "Pointers" in the first column. By initiating Diagnostic
Mode and observing evaporator temperatures, it may be determined unnecessary to tap the sealed system. If need-
ed, the table on the following page provides a quick reference for temperature/pressure correlation.
NOTE: If entering the sealed system to check pressures, always use solder-on process valves. Do NOT use bolt-
on process valves as they are prone to leak.
NOTE: Whenever servicing the sealed system, the high-side filter-drier must be replaced.
Model
700BC/I-3
700BR-3
700BF/I-3
If low-side pressure is
NORMAL
LOW
LOW
HIGH
HIGH
#3758424 - Revision B - December, 2005
Integrated
NORMAL OPERATING PRESSURES
Normal Low-Side Pressures
3" vacuum to 2 psi
X" vacuum to X psi
3" vacuum to 2 psi
PRESSURE INDICATIONS
& high-side pressure is
NORMAL
LOW
HIGH
LOW
HIGH
8-16
3 Series
(700- BASE)
Normal High-Side Pressures
90 psi to 120 psi
XX psi to XXX psi
90 psi to 120 psi
possible problem is
MECHANICAL
(see General Troubleshooting Guide)
RESTRICTION
INEFFICIENT COMPRESSOR
OVER CHARGE
LEAK