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User Information Manual 674B SINGLE-PACKAGED GAS HEAT/ELECTRIC HEAT PUMP UNIT WITH PURON® (R-410A) REFRIGERANT NOTE: Read the entire instruction manual before starting the installation. SAFETY CONSIDERATIONS Note to Installer: This manual should be left with the equipment user. Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified personnel should install, repair, or service air-conditioning equipment. Untrained personnel can perform basic maintenance functions of cleaning coils and filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the literature, tags, and labels attached to the unit, and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations. WARNING: Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide poisoning, fire, or an explosion which could result in personal injury or unit damage. Consult a qualified installer, service agency, or gas supplier for information or assistance. The qualified installer or agency must use only factory-authorized kits or accessories when modifying this product. WARNING: Before performing service or maintenance operations on unit, turn off gas supply to unit. Then turn off unit main power switch. Electrical shock or explosion could cause serious injury or death. Cancels: New OM10–21 1–04 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. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these instructions exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We require these instructions as a minimum for a safe installation. UNIT INTRODUCTION This 674B unit is a small packaged gas heat/electric heat pump system that can utilize both the efficiency of heat pump heating and the comfort of gas heating. The system will optimize for ideal heating, depending on several factors. This unit uses Puron®, the ozone friendly refrigerant for cooling and heat pump heating. WARNING: Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system which has been under water. Failure to follow this warning could result in electrical shock, fire, serious injury, or death. Recognize safety information. This is the safety-alert symbol . When you see this symbol in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in C99088 Fig. 1—Unit 674B Starting or Shutting Unit Off 1. To start the unit: a. Turn on the electrical and gas power supply to unit. b. Select desired temperature on thermostat and set SYSTEM switch or MODE control to desired mode. 2. To shut unit off: NOTE: If the unit is being shut down because of a malfunction, call your dealer as soon as possible. a. Set system SWITCH or MODE control to OFF. b. Turn off the electrical power, install lock-out tag and shut off gas supply to unit. —1— OPERATING YOUR UNIT V. EMERGENCY HEAT MODE The operation of your system is controlled by the indoor temperature control (for 674B, either a Thermidistat™ or dual fuel thermostat is required). You simply adjust the thermostat and it maintains the indoor temperature at the level you select. Most thermostats of heating and cooling systems have 3 controls: a temperature control selector, a FAN control, and a SYSTEM or MODE control. Refer to your thermostat owner’s manual for more information. To better protect your investment and to eliminate unnecessary service calls, familiarize yourself with the following facts: 1. During heat pump heating, increasing the thermostat setting more than 2°F may cause the supplemental gas heat to be turned on for a short period of time to satisfy the thermostat. Needless use of the supplementary heat reduces potential energy savings. 2. Ice or frost tends to form on the coil during winter heating operation. Your heat pump is designed to automatically melt the ice. When in this defrost cycle, it is normal for steam or fog to rise from the outdoor unit. Do not be alarmed! I. COOLING MODE With the SYSTEM or MODE control set to COOL, your unit will run i...