Carrier WEATHERMASTER 2000 - Manual (Page 4)

from the outside air. So, to mamtain energy-efficient opera­
tion, your heat pump has an automatic defrost cycle.
The defrost cycle starts at a preset time interval of 90 min­
utes, although, it may be reset to either 30 or 50 minutes.
Defrost will start at the preset time only if the ice is suffi­
cient to interfere with normal heating operation.
After the ice is melted from the outdoor coil, or after a maxi­
mum of 10 minutes in the defrost mode, the unit will auto­
matically switch back to normal heating operation.
Do not be alarmed if steam or fog appears at the outdoor
unit during the defrost cycle. Water vapor from the melting
ice may condense into a mist in the cold outside air.
During certain weather conditions such as heavy snow and
freezing rain it is not uncommon for ice to build up on the
outdoor unit grille. This is normal for these weather condi­
tions. Do not attempt to remove the ice from the outdoor
unit grille. This condition will not affect the proper function
of the unit and will clear within a few days.
EMERGENCY HEAT
The EMERGENCY HEAT setting on your thermostat
refers to any supplementary heating appliance that may be
included in your home comfort system. Operation of the
EMERGENCY HEAT source may be required if heating
demands exceed the capacity of the heat pump, or if the
heat pump malfunctions.
The red light on your thermostat will glow if the EMER­
GENCY HEAT switch is moved from NORMAL to the
EMERGENCY HEAT setting. See Fig. 4. This indicates
that the heat pump is off and the supplemental heating
appliance is selected for operation.
Fig. 4—Thermostat with Emergency
Heat indicator
Also, if your particular model of heat pump includes an
“efficiency alarm” circuit, the red light will glow if the com­
pressor malfunctions. Call your dealer for immediate service
if you suspect trouble.
During the heating season, switch to EMERGENCY
HEAT if the electricity to your outdoor unit has been off for
more than 30 minutes for any reason (i.e., power outage).
Leave the switch in the EMERGENCY HEAT position for
an amount of time equal to that during which the power was
off. It isn’t necessary to exceed 12 hours. If you cannot
determine how long the power has been off, leave the switch
in the EMERGENCY HEAT position for 8 hours.
NOTE: The EMERGENCY HEAT switch is effective only
when the SYSTEM switch is set at the HEAT or AUTO
position.
Fig. 5—Removing Fiiter from
Fan Coil Unit
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your heat pump unit
will operate economically and dependably. Maintenance can
be accomplished easily by referring to the following direc­
tions. However, before performing maintenance, consider
these important safety precautions:
• DISCONNECT ALL ELECTRICAL POWER TO THE
AIR CONDITIONER BEFORE REMOVING ACCESS
PANELS TO PERFORM MAINTENANCE. Disconnect
power to both the indoor and outdoor units. NOTE:
THERE MAY BE MORE THAN ONE ELECTRICAL
DISCONNECT SWITCH.
• ALTHOUGH SPECIAL CARE HAS BEEN TAKEN
TO MINIMIZE SHARP EDGES IN THE CONSTRUC­
TION OF YOUR UNIT, BE EXTREMELY CAREFUL
WHEN HANDLING PARTS OR REACHING INTO THE
UNIT.
CHECK THE AIR FILTER
A dirty air filter will cause excessive strain on the compres­
sor and blower motor. This can cause the components to
over-heat and automatically shut down. In the extreme, the
components will fail and need to be replaced. To avoid ineffi­
cient or failed operation of your unit, CHECK THE FIL-
TER(S) EVERY 3 TO 4 WEEKS. Replace filter(s) when nec­
essary, or clean the filter(s) if you have the reusable type.
Disposable filters should be replaced by similar, new filters
of the same dimensions.
Reusable, permanent filters should be washed in a solution
of cold water and mild detergent, then rinsed and thor­
oughly dried. THE FILTER MUST BE COMPLETELY
DRY BEFORE BEING REINSTALLED. To avoid pro­
longed shutdown of your unit while a filter is drying, you
should have an extra filter on hand. This would allow you to
rotate between the two with minimal downtime for your
comfort system. Extra filters may be purchased from your
dealer.
There are no filters in the outdoor unit of a split-system. If
your indoor unit is a gas or oil furnace, refer to your furnace
owner’s manual for filter location and procedures for
replacement or cleaning.