Refrigerators & Freezers Tundra Technical Manual Service & Training Revised: 10-22-03 L-2120
Table of Contents Refrigerators & Freezers • Installation Warnings ........................................................................................................................................................................................................ 3 Tundra Installation Check List .........................................................................................................................................................................
Refrigerators & Freezers • Installation Warnings • Carefully review all wiring diagrams included. If you purchase a DC only Tundra Unit, simply wire your unit directly to the appropriate DC power source. If you purchased an AC/DC model, please refer to wiring diagrams to assure proper installation per your individual application.
Tundra Ventilation Requirements Installation 4
inches for air entry and discharge.) A lower entry, and upper discharge is preferred. See Ventilation Requirements diagram in this manual. Overload Protections The compressor overload and start protection cuts off power to the compressor if the compressor speed drops below approximately 1,900 rpm, or if this motor speed is not reached during the start sequence.
Electrical Wiring Guidelines - Direct Current ABYC Guideline E9 (below) meets or exceeds Trucking Industry Standard SAE J1292 Conductor Sizes for 3 Percent Drop in Voltage DC Wiring Diagram * Note: T18 & T22 Models use a 277-ohm resistor.
Refrigerators & Freezers • Operation Warnings 1. Coldest Setting This section of the manual refers to essential safety operation information for all compressor-type refrigerators and freezers provided by Dometic Corporation. 2. Adjustment Knob. Turn Clockwise • Before carrying out any maintenance or cleaning operations, disconnect appliance from power supply via the circuit breaker. • Do not put glass containers holding liquids in the freezer compartment.
Loading the Appliance Once you set the thermostat to a desired temperature, allow the unit to RUN at least 12 hours (24 hours for best results) before loading it with goods.
Refrigerators & Freezers • Maintenance Defrosting Defrosting should be carried out whenever the frost layer exceeds a thickness of 1/8 inch. This is necessary to guarantee efficient refrigeration and to avoid excessive power consumption. Excess frost buildup will affect the appliance’s performance. To completely defrost, turn the appliance OFF. Keep the door/lid open to minimize the defrosting time. Do not attempt to remove the frost layer using any sharp metal instruments.
Refrigerators & Freezers • Trouble-Shooting The trouble-shooting guidelines below are arranged sequentially and should be followed in order. Start with “General Trouble-Shooting” A, B & C; then go to “Specific Trouble-Shooting of Electrical Components”, starting with “A” and working through systematically to “F”. C. Insufficient Refrigerating Capacity Check that: 1. The door/lid is sealed properly and the hinges are working correctly. 2. The appliance is not positioned close to heat sources.
1 Flash = Battery protection cut-out (The battery voltage was below the cut-out setting). Check the source battery and/or alternative DC power source(s) for proper operation and sufficient voltage output. If power source is adequate then check wire sizes against the Electrical Wiring Guidelines. cut-out is 10.4 volts and the cut-in is 11.7 volts. For 24VCD unit the cut-out is 22.8 and the cut-in is 24.2.
Figure 3.0 - Thermostat Circuit Figure 5.0 -Thermostat Resistor C. Checking the Thermostat Circuit Connect ohmmeter to either end of resistor assembly (Figure 5.0). This is a 277-ohm resistor, verify that it is operating properly to spec (with the 277-ohm resistor, the control circuit current should be 4mA). 1. Remove brown & blue wires from terminal “C” and from resistor connected to terminal “T”. Connect meter leads to these wires as shown in Figure 3.0 - no polarity is needed. D.
E. Checking the Fan 1. The fan should come on after a five second delay once the compressor starts. 2. Visually inspect fan for any blockages and make sure that it can turn freely. 3. If the fan can spin freely and is not working then first check the fan terminals “+” (the smaller of the two ”+” symbols) and “F” on the module for voltage (Figure 7.0). 4.
WARNING pressure action does not: (1) pressurize an area to the extent that structural failure occurs which could cause harm to occupants or bystanders, or (2) cause a suction or low pressure in an area where hydrogen gas from batteries, raw fuel vapor from fuel tanks, carbon monoxide from operating propulsion engines, power generators or heaters, methane gas from sewage holding tanks, or any other dangerous gas or vapor could exist.
Notes:
Dometic Corporation P.O. Box 15299 • Richmond, VA 23227-0699 USA 804-746-1313 • Facsimile: 804-746-7248 • www.tundra.cc 2000 N. Andrews Ave. Ext.
