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Follow all local electrical codes during installation. All wiring must conform to local and national electrical codes. Improper wiring or installation may damage thermostat. Recognize safety information. This is the safety-alert symbol . When you see this symbol on the equipment and in the instruction manual, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage. INTRODUCTION Bryant’s 7-day programmable dual fuel thermostat is a wall- mounted, low-voltage thermostat which provides proper control of a heat pump (HP) and furnace combination without using a HP/furnace interface kit. Separate heating and cooling setpoints, plus auto changeover allow setback programming for maximum energy savings. Up to 4 time/temperature settings per 24 hour period for 7 independent days may be programmed. Batteries are not required; during a power interruption, the internal memory stores programs for an unlimited time and the clock continues to run for at least 72 hrs. SYSTEM CONSIDERATIONS The dual fuel thermostat is designed to be used only in HP/furnace installations. It replaces a conventional 2-stage HP thermostat and a HP/furnace interface kit. An outdoor temperature sensor, Part No. TSTATBBSEN01 MUST be used with this thermostat. It is not supplied with thermostat. CAUTION: If HP is not already equipped with a high- pressure switch, one must be added for dual fuel applications. It protects HP from overpressure which would occur if a failure resulted in both HP and furnace operating at same time. Kit No. KSAHI0201HPS includes required switch and instructions for its proper installation. A HP/furnace installation has several special requirements. Foremost is that furnace and HP must not be allowed to operate at same time, except during HP defrost. A second is to have furnace complete a heating cycle once it is turned on. A third is the need to have HP not operate at all when outdoor temperatures are below a certain value. Finally, HP and furnace must work together properly to provide an efficient and comfortable defrost. These requirements are addressed by the dual fuel thermostat itself and an interface kit is NOT required. Cancels: New II TSTAT-0-6 ® Fig. 1—Bryant Programmable Thermostat A95221 HEIGHT (IN.) WIDTH (IN.) DEPTH (IN.) 7-1/2 4-1/4 1-3/8 APPLICATION The dual fuel thermostat is designed for the following applications: 1-stage cool, 2-stage heat: 1-speed HP with 1-stage furnace 1-stage cool, 3-stage heat: 1-speed HP with 2-stage furnace 2-stage cool, 3-stage heat: 2-speed HP with 1-stage furnace 2-stage cool, 4-stage heat: 2-speed HP with 2-stage furnace* *This combination must use furnace algorithm to control furnace staging. As outdoor temperature decreases, heat loss increases and HP capacity decreases. There is a temperature below which HP will not be able to "keep up" and furnace will be required to maintain temperature. This is the thermal balance point. There is also an economic balance point, determined by relative costs of fuel and electricity, below which the furnace is the most cost effective and above which the HP is the most cost effective. Finally there may be a comfort balance point below which leaving air temperature of HP is not comfortable, even if HP has sufficient capacity to keep structure warm. Any of these balance points may be the determining factor in the selection of an outdoor temperature below which HP will be turned off and only furnace allowed to operate. This balance point temperature is entered into thermostat by installer. Outdoor temperatures from 15°F to 55°F may be selected. Instructions for entering this selection is covered in the section: Balance Point—Value Selection. When outdoor temperature is below selected balance point tem perature, furnace is used exclusively to supply heat. When outdoor temperature is above both selected balance point temperature and thermal balance point, HP will be used exclusively, because it will have sufficient capacity to satisfy load. —1— If selection of balance point temperature is such that it is below thermal balance point, all operation between these 2 temperatures will be part HP and part furnace. A heating cycle will begin with HP operation. Because HP has insufficient capacity, structure temperature will slowly fall. After a time, thermostat will issue next stage call, turning off HP and turning on furnace. Furnace will operate until thermostat is completely satisfied at which time furnace will turn off. The next heating cycle will begin with HP and cycle will repeat. This operating mode is acceptable as long as selected balance point temperature i...