Thermo King 914970, Manual

Page: 25 / 186

Unit Description
25
Defrost Operation
The Defrost mode can be initiated any time the
evaporator coil temperature is below 42.0 F
(5.6 C). Defrost is initiated automatically by the
defrost air switch and defrost timer or manually
by pressing the Manual Defrost switch.
When a Defrost cycle is initiated, the defrost relay
energizes the damper solenoid and pilot solenoid.
The unit remains on Defrost until the evaporator
coil temperature rises to 52.0 F (11.1 C), causing
the defrost termination switch to open. When the
defrost termination switch opens, the unit may
shift back to the Cool or Heat mode, or the Null
mode (optional Start/Stop operation).
If the thermostat calls for the Null mode (optional
Start/Stop operation) while the unit is defrosting,
the unit will continue to run until defrosting is
complete. Then the unit will stop.
Serial Number Locations
Unit:
Nameplate on top of roadside of the unit
frame above the switch panel.
Engine:
Nameplate on top of the rocker arm cover.
Compressor:
Stamped on the side below the sight
glass.
Electric Motor:
Nameplate attached to the motor
housing.
Unit Features
• TK 3.95 Diesel Engine
• X426 Compressor
• ThermoGUARD V Microprocessor Controller
• Tapered Roller Bearing Fanshaft & Idler
• Heavy Duty Oil Bath Air Cleaner
• Three-way Valve Refrigeration System
• One-piece Main Wiring Harness
• Spin-on Fuel Filter
• Spin-on Full Flow Oil Filter
• Electric Fuel Pump
• Coolant Expansion Tank with Coolant
Indicator
• 23 Ampere Alternator
• Defrost Timer (Part of TG-V)
• Air Defrost Switch
• Electronic Engine Hourmeter
• Alternator Discharge Light
• Digital Thermometer (Part of TG-V)
• TherMax™ Defrost/Heating System
• R-404A.
Unit Options
• Electric Standby Motor (Model 50)
• CYCLE-SENTRY Start/Stop Controls
• Remote Control Box (outside, beneath unit)
• In-Cab w/TG-V
• Hourmeter, Electric Operation (Model 50)
• Dry-type Air Cleaner
• Fuel Heater
• Ammeter
• Silicone Coolant Hoses
• Oil Pressure Gauge
• Remote Indicator Lights
• Top Screen
• Engine Coolant Temperature Gauge
• Suction Pressure Gauge
• Electric Heaters
• Spin-on Bypass Oil Filter
• R-134a.