Service manual

7-1 T-294-01
SECTION 7
ELECTRICAL WIRING SCHEMATIC AND DIAGRAMS
7.1 INTRODUCTION
This section contains Electrical Schematics and Wiring Diagrams covering the Models listed in NO TAG. The
followinggeneralsafetynotices supplementthespecificwarningsand cautionsappearingelsewhereinthismanual.
They are recommended precautions that must be understood and applied during operation and maintenance of the
equipment covered herein.
WARNING
It has been determined that pressurized, air -rich mixtures of refrigerants and air can undergo
combustion when exposed to an ignition source.
WARNING
Bewar e of unannounc ed starting of the evaporator and conde nser fans. Do not ope n the condenser fan
grille before turning pow e r OFF and disconne c ting power plug.
WARNING
Make sure power to the unit is OFF and power plug disconnected before removing capacitor(s).
WARNING
Do not attempt to remove power plug(s) before turning OFF start-stop switch (ST), unit circuit
breaker(s) and external power source.
Make sure the power plugs are clean and dry before connecting to any power r eceptacle.
WARNING
Make sure power to the unit is OFF and power plug disconnected before replacing the compressor.
WARNING
Before disassembly of the compressor make sure to relieve the internal pressure very carefully by
slightlylooseningtheboltsonbothservicevalveflanges/blankvalvepads,thenlightlytappingsidesof
the valve flanges/pads with a hammer to break the seal.
CAUTION
Use only Carr ier Transicold appr oved Polyol Ester Oil (POE) -- Castrol-Icemat ic SW20 compr e ssor oil
with R-134a. Buy in quantitie s of one quart or smalle r. Whe n using this hygroscopic oil, im me diately
r e seal. Do not leave container of oil open or contamination will occ ur.
WARNING
DonotattempttodoserviceworkontheController/DataCORDERmodule.Breakingofthewarranty
seal will void the warranty.
CAUTION
Remove the Controller/DataCORDER module and unplug all wire harness connectors before
performing any arc welding on any part of the container.
Donotremovewireharnessesfrommoduleunlessyouaregroundedtotheunitframewithastaticsafe
wrist strap.
NOTE
Toavoiddamagetotheearth’sozonelayer,usearefrigerantrecoverysystemwheneverremovingrefrigerant.
When working with refrigerants you m ust comply with all local government environmental laws. In the
U.S.A., refer to EPA section 608.