Trane Packaged Systems or All-in-One, DC-UC-WEB01 manual General Information, Overview, Thermostat

Safety Section – Dual Fuel and Gas/Electric Systems

General Information

Understand the signal words DANGER, WARNING, and CAUTION. These words are safety alert words. DANGER indicates the most serious hazards which will result in severe personal injury or death. WARNING indicates hazards which could result in personal injury or death. CAUTION is used to indicate unsafe practices which could result in minor injury or property damage.

Overview

Your combination dual fuel heating/electric cooling unit is designed to provide comfort all year long with safe, efficient, trouble-free operation. It is important that you understand how to operate and maintain your unit to keep it operating safely and efficiently. This guide will acquaint you with these important procedures. Familiarize yourself with this manual and store it in a convenient location for future reference.

Any additions, changes, or conversions required in order for the unit to satisfactorily meet the application needs, should be made by a qualified product distributor or local dealer, using factory specified and approved parts. See Figure 1 for component layout.

Compressor
			Heat
Indoor	Gas Valve		Exchangers
Blower
Motor		Burners
		Note: Depending on furnace size,
		your unit may have 1, 2, or 3 burners.

Figure 1. Component Layout

Thermostat

Room thermostats are delicate temperature-sensing controls. Their main function is to energize and de-energize the heating or cooling circuit to maintain the temperature setting you select.

Many thermostats contain a room thermometer to indicate the approximate room temperature, and a temperature scale to select the desired indoor air temperature. In addition, most thermostats have modes of HEAT, OFF and COOL, and fan modes of ON and AUTO.

When OFF is selected your unit will not operate in either heat or cool modes. If HEAT or COOL is selected, the unit will automatically cycle on and off to maintain the desired temperature settings.

When AUTO is selected, the fan will only operate as required during the heating or cooling cycles. The fan mode can be used to operate the indoor fan continuously by selecting ON. Continuous fan mode during cooling operation may not be appropriate in humid climates. If the indoor air exceeds 60% relative humidity or simply feels uncomfortably humid, it is recommended that the fan only be used in the AUTO mode.

To ensure that the thermostat operates properly, it must be level and positioned to avoid the influence of such external heat sources as lamps, televisions or other heat-producing appliances.

Remember these instructions at all times:

•Never perform any maintenance procedures until the electrical power to the unit is turned off.

•Never perform any maintenance procedures until the gas valve in the gas supply line is turned off.

•Never remove any panel from the unit while it is operating.

•Never remove panels or parts from the unit that are not discussed in this guide.

•Never cover the unit since it is designed to operate year round.

•Never store anything flammable or combustible around or near the unit.

Your unit is of complex design. To ensure that it performs safely and gives long-lasting service, some of the maintenance work must be performed by a qualified service technician.

When a service technician is referred to in this manual, it is describing a service technician that has had special training or a number of years experience in servicing this type of equipment. It is your responsibility to select a qualified service company that can provide a service technician of this caliber.

Two Stage Cooling Models – For units with the feature of two staged cooling, the thermostat will determine whether to run the system at the full capacity or a lower capacity. This depends on the daily cooling load of the conditioned space. The system is more efficient when running at low capacity (1st stage). At lower outdoor temperatures 1st stage will be sufficient to maintain indoor comfort.

With the thermostat set to COOL, the system will automatically cycle on and off as well as from low (1st stage) to high (2nd stage) as needed to maintain the thermostat set point for indoor comfort. During 1st stage operation the compressor, as well as the indoor fan, will run at a reduced speed. This produces a reduced capacity which is more efficient than the high capacity 2nd stage. If the low capacity (1st stage) is not sufficient to maintain the thermostat setting, the system will switch to high speed (2nd stage). As the thermostat temperature setting is reached, the system will cycle to low speed then off.

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