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920-164-02 (10-04)
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 fl ow 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 effi ciently. 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 fi tting
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.
Typical Heat /Cool Thermostat
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 fi ltration.
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 effi ciency 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
humidity to your home and force your cooling unit to work
longer to keep your home comfortable:
• Entrance doors are frequently opened and closed.
• Laundry appliances are being operated.
• A shower is running.
• More than usual number of people are present in the home.
• More than the normal number of electric lights are in use.
• Drapes or blinds are open on the sunny side of the
building or home.
Summary of Contents for VERT-I-PAK B-SERIES
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