Carrier 38E User Manual
Page 12
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
24-VOLT WIRING
*
c
LINE VOLTAGE
SUPPLY WIRE
P
PASS SUPPLY WIRE THRU
METALLIC LOOP TWICE ON
UNITS WITH NAMEPLATE
RLA OF 14 AMPS OR LESS
07
FIELD LINE VOLTAGE SUPPLY WIRE
>TB
THERMOSTAT
SUBBASE
INDOOR UNIT
TERMINAL
BOARD
OUTDOOR UNIT
TERMINAL
BOARD
C — Contactor
LLPS — Liquid Line Low-Pressure Switch
TB — Terminal Board
Common Potential
Factory Wiring (field connected)
_____ Field-Supplied Wiring
Fig. 15 — Wiring Connections for Service Sentry and Solid-State Time Guard II
Compressor
— The compressor is the heart of the
refrigeration system. It pumps refrigerant through the
system. If it malfunctions, the whole system suffers.
The compressor is an electrical (as well as mechanical)
device. Extreme caution should be exercised when work
ing near compressors. Power should be shut off, if
possible, for most troubleshooting techniques. Refrig
erants in system present other safety hazards. Always
wear safety glasses and gloves when handling refrigerants.
Compressor failures are classified in 2 broad failure
categories, mechanical and electrical. Both types are
discussed below and on page 13.
MECHANICAL FAILURES — Compressor is a
mechanical pump driven by an electric motor contained
in a welded or hermetic shell. In a mechanical failure,
motor or electrical circuit appears normal, but com
pressor does not function normally.
12