Carrier WEATHERMASTER 2000 - Manual (Page 3)

Fig. 2—Manual Changeover
Thermostat
normal for steam or fog to rise from the outdoor unit. Do
not be alarmed!
• Do not operate your unit in cooling mode when outdoor
temperatures are below 55 F.
• Do not operate your unit in heating mode when outdoor
temperatures are above 66 F.
OPERATING YOUR HEAT PUMP
The operation of your heat pump system is controlled by
the indoor thermostat. You simply adjust the thermostat
and it maintains the indoor temperature at the level you
select. Most thermostats for heat pump systems have four
controls. These are the temperature control selector, FAN
switch, SYSTEM switch, and EMERGENCY HEAT
switch.
The temperature control selector is a dial or lever that
allows you to establish the degree of temperature that you
wish to maintain for your personal comfort. Some thermo­
stats possess two temperature control selectors: one for set­
ting the temperature desired during the cooling cycle, and
one to set the heating operation temperature. Typical set­
tings are 78 degrees Fahrenheit for cooling and 68 degrees
for heating.
The FAN switch offers two options for controlling the
blower: AUTO and ON. When set to AUTO, the blower will
run during the time the heat pump is operating. When the
FAN switch is set at the ON position, the blower will run
continuously.
Typically, the SYSTEM switch on your thermostat offers
the following selections: COOL, OFF, and HEAT. Your
thermostat may also have a fourth selection, AUTO. The
heat pump will not operate when the SYSTEM switch is set
at the OFF position. With the SYSTEM switch set at
COOL, your heat pump will operate in its cooling mode
when the indoor temperature rises above the level that you
wish to maintain. With the SYSTEM switch set at the
HEAT position, your heat pump will provide warmth when­
ever the indoor temperature falls below the level that you
have selected.
The AUTO selection found on some thermostats provides
for automatic changeover between cooling and heating
cycles. With the SYSTEM switch set in the AUTO position,
the cooling mode is activated when the indoor temperature
rises above the thermostat cooling temperature setting, or
the heating mode will be activated when the indoor tempera­
ture drops below the thermostat setting for the heating
cycle.
Depending on your typical winter heating needs, your home
comfort system may include a supplementary heating
source. The EMERGENCY HEAT switch provides for con­
venient selection between the two heating appliances. Your
heat pump wiU operate when the switch is set at NORMAL.
With the switch set at the EMERGENCY HEAT position,
the heat pump will ttun off and the supplementary heat
source will be activated.
COOLING CYCLE
When operating in the cooling cycle, your heat pump will
run until the indoor temperature is lowered to the level you
have selected. On extremely hot days, your conditioner will
run for longer periods at a time and have shorter “off” peri­
ods than on moderate days.
The following are typical conditions that add extra heat
and/or humidity to your home. Your cooling unit will work
longer to keep your home comfortable under these
conditions:
• Entrance doors are frequently opened and closed
• Laundry appliances are being operated
• A shower is running
• More than the usual number of people are present in the
home
• More than the normal number of electric lights are in
use
• Drapes are open on the sunny side of the home
HEATING CYCLE
With the SYSTEM switch of your indoor thermostat set to
the HEAT position, the heating section of your home com­
fort system will operate until room temperature is raised to
the level you have selected. Of course, the heating unit will
have to operate for longer periods to maintain a comfortable
environment on cooler days and nights than on moderate
ones.
Refer to your furnace user’s manual for specific information
on heating operation.
DEFROST CYCLE
When your heat pump is providing heat to your home and
the outdoor temperatmre drops below 45 degrees Fahren­
heit, moisture may begin to freeze on the surface of the out­
door coil. If allowed to build up, this ice would impede air­
flow across the coil and reduce the amount of heat absorbed
Fig. 3—Main Electricai Disconnect