Operating the VERT-I-PAK Thermostat Operation

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.