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Air entering a conventional furnace at 60°F may be warmed 60° to 100°F. The supply air leaving the registers would then be between 120° and 160°F depending on the system. A heat pump warms the same 60°F air 20° to 30°F. The supply air leaving the registers would then be between 80° and 90°F. This air may feel cool because it is slightly less than your body temperature. However, it is sufficiently warm to keep you comfortable and is adding heat to your home. A heat pump will run for much longer periods of time than a conventional furnace. This longer operational time is normal for all heat pumps and is saving you energy in comparison to many conventional furnaces. On days with outdoor temperatures below 40°F, it is normal for the heat pump to run for extended periods of time and may be assisted by the auxiliary electric resistance heating elements. Once you understand the operation of your new heat pump, you will appreciate its constant, even heat and lower energy consumption. Heat Mode Operation During the heat mode of operation, frost or ice may build up on the outdoor-air coil after operating for extended periods during particularly cool and humid weather. When this occurs, your heat pump senses this condition and goes through a defrost cycle. During the defrost cycle, the outdoor-air blower is turned off, and the reversing valve reverses the flow of refrigerant through the outdoor-air coil so it is heated and the frost or ice melts. You may notice the defrost cycle inside your home by a faint click and hissing sound and a slight change in the sound created by the blower as the defrost cycle begins and ends. During the defrost cycle, you may also notice that the air is quickly heated as the defrost cycle ends. Outside the home, a cloud of water vapor created by the melting frost or ice may be visible as it is exhausted. This is normal and keeps the unit working efficiently. Do not be alarmed! Condensate The heat pump may generate condensate during both the cooling and heating modes of operation. For proper operation, a condensate drain line must be extended from the drain fitting on the right side of the unit to the perimeter of the home or to a proper drain location. The drain line must be sloped towards the outside of the home or drain location and be protected from freezing. NOTE:In order for condensate to drain freely, the unit must be installed level. OPERATING THE VERT-I-PAK THERMOSTAT OPERATION The operation of the system is controlled by the indoor thermostat. Most thermostats have 3 controls: a temperature control selector, a FAN control, and a SYSTEM or MODE control. (See Figure 3.) The temperature control is a selector or set of buttons that allows you to establish the degree of temperature that you wish to maintain for your personal comfort. Some thermostats have two temperature control selectors: one for setting the temperature desired during the cooling cycle, and one for setting the heating operation temperature. Typical settings are 78°F for cooling and 68°F for heating. Fan Control The FAN control offers two options for controlling the indoor-air blower: AUTO and ON. When the FAN control is set to AUTO, the blower will operate only while the thermostat operates the cooling or heating equipment. When the FAN control is set to ON, the blower will operate continuously – regardless of whether cooling or heating equipment is operating. This setting allows for continuous air circulation and filtration. System Control The SYSTEM or MODE control on your thermostat offers the following selections: COOL, OFF, HEAT, and EM HEAT. Neither the cooling nor heating equipment will operate when the SYSTEM or MODE control is set to OFF. With the SYSTEM or MODE control set to COOL, your unit will operate in cooling mode. With the SYSTEM or MODE control set to HEAT, your unit will operate in heating mode. Auxiliary Heating Your system also includes an auxiliary electric heating source. The SYSTEM or MODE control options HEAT and EM HEAT provide convenient selection between the two heating appliances. The heat pump will operate when SYSTEM or MODE control is set to HEAT. The auxiliary electric heater may also be used on cold days to supplement heat pump heating. With the SYSTEM or MODE control set to EM HEAT, the heat pump is turned off and the auxiliary electric heat is activated. The unit is now operating as an electric furnace. On heat pump systems, the wall thermostat regulates the use of auxiliary electric heat to maximize energy efficiency and your home comfort. COOLING CYCLE When operating in the cooling cycle, your unit will operate until the indoor temperature is lowered to the level you have selected on the indoor thermostat. On extremely hot days, your unit will operate for longer periods of time and have shorter “off” periods than on moderate days. The following are typical conditions that add extra heat and/or h...

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