50EZ---A and 50VT---A
Comfort™ and Performance™ 13 and 14 SEER
Single Packaged Heat Pump System
With PuronR (R---410A) Refrigerant
Single and Three Phase
2 --- 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )
Owner’s Information Manual
A09033
A09034
Unit 50VT--A without Economizer
Unit 50EZ--A without Economizer
A10078
A10077
Unit 50VT--A with Economizer
Fig. 2 -- Unit 50VT--A
Unit 50EZ--A with Economizer
Fig. 1 -- Unit 50EZ--A
1
Download from Www.Somanuals.com. All Manuals Search And Download.
amount of heat absorbed from the outside air. So, to maintain
energy--efficient operation, your unit has an automatic defrost
mode.
!
CAUTION
CUT HAZARD
The defrost mode starts at a preset time interval of 60 minutes,
although, it may be reset to 30, 90 or 120 minutes. Defrost will
start at the preset time only if the ice is sufficient to interfere with
normal heating operation.
After the ice is melted from the coil, or after a maximum of 10
minutes in defrost mode, the unit automatically switches back to
normal heating operation.
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing furnaces.
Do not be alarmed if steam or fog appears at the outdoor unit
during defrost mode. Water vapor from the melting ice may
condense into a mist in the cold outside air.
OPERATING YOUR UNIT
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 of heat pump systems have 3 controls: a temperature
control selector, a FAN control, and a SYSTEM or MODE control.
Refer to your thermostat owner’s manual for more information.
During certain weather conditions such as heavy snow and freezing
rain it is not uncommon for ice to build up on the unit grille. This
is normal for these weather conditions. Do not attempt to remove
the ice from the unit grille. This condition will not affect the proper
function of the unit and will clear within a few days.
To better protect your investment and to eliminate unnecessary
service calls, familiarize yourself with the following facts:
Emergency Heating Mode
In the event of primary unit heat failure, the emergency heat mode
allows your supplemental heating source to keep your home or
office warm until your unit can be serviced. Contact your dealer in
the event of primary unit heat failure.
1. During heating, increasing the desired temperature setting
more than 2°F (1.1°C) may cause the supplemental heaters
to be turned on for a short period of time to satisfy the
demand. Needless use of the supplementary heat reduces
potential energy savings.
2. Ice or frost tends to form on the coil during winter heating
operation. Your unit is designed to automatically melt the
ice. When in this defrost cycle, it is normal for steam or
fog to rise from the outdoor unit, and for water to drain
from the outside of unit. Do not be alarmed!
MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed by
your dealer and care you, as the owner, may wish to handle for
your new unit.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
To assure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance from the
top of the unit is 48 in. (1219 mm). Clearance of at least 36 in.
(914 mm) is required on sides except the power entry side (42 in.
[1067 mm] clearance) and the duct side (12 in. [305 mm]
minimum clearance).
To start the unit:
1. Turn on the electrical power supply to unit.
2. Set MODE control to desired mode and select temperature.
To shut off unit:
NOTE: If the unit is being shut down because of a malfunction,
call your dealer as soon as possible.
1. Set system MODE control to OFF.
2. Turn off the electrical power supply to unit.
Cooling Mode
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
With the SYSTEM or MODE control set to COOL, your unit will
run in cooling mode until the indoor temperature is lowered to the
level you have selected. On extremely hot days, your unit will run
for longer periods at a time and have shorter “off” periods than on
moderate days.
!
WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK, CUT
HAZARD
Heating Mode
Failure to follow this warning could result in personal
injury, death or property damage.
With the SYSTEM or MODE control set to HEAT, your unit will
run in heating mode until the room temperature is raised to the
level you have selected. Of course, your unit will run for longer
periods to maintain a comfortable environment on cooler days and
nights than on moderate ones.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE
SERVICING
OR
PERFORMING
MAINTENANCE AND INSTALL A LOCK--OUT
TAG.
Supplemental Heat
2. When removing access panels or performing
maintenance functions inside your unit, be aware of
sharp sheet metal parts and screws. Although special care
is taken to reduce sharp edges to a minimum, be
extremely careful when handling parts or reaching into
the unit.
Your unit is your primary heating source. Your system may also be
equipped with a supplemental heating source such as electric heat.
On cold days and nights, your system will automatically turn on
the supplemental heat, as needed, in order to maintain the level of
comfort you have selected.
When your heat pump needs additional heat to keep you
comfortable your thermostat will turn on the supplemental heat (if
equipped).
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and changed
or cleaned whenever it becomes dirty. Dirty filters produce
excessive stress on the blower motor and can cause the motor to
overheat and shut down.
Defrost Mode
When your unit is providing heat to your home or office and the
outdoor temperature drops below 45°F (7.2°C), moisture may
begin to freeze on the surface of the coil. If allowed to build up,
this ice would impede airflow across the coil and reduce the
This unit must have an air filter in place before it can be operated.
These filters should be located in at least one of two places. In
3
Download from Www.Somanuals.com. All Manuals Search And Download.
many applications, the installer will provide return air filter grilles
mounted on the wall or ceiling of the conditioned structure. In the
instance of filter grilles, the filters can simply be removed from the
grille and replaced.
The other typical application is an accessory filter rack installed
inside the unit itself. The following information is given to assist in
changing filters used in these internal filter racks.
Table 1 indicates the correct indoor filter size for your unit. Refer
to Fig. 3 to access filters installed in the accessory filter rack. If
using an Accessory Filter Rack, refer to the Installation Instructions
provided with it for correct filter sizes and quantities.
Table 1 – Air Filters Located Inside Unit
(For Replacement Purposes)
Unit Size
A24
Filter Size in. (mm)
20x20x1 (508x508x25)
20x24x1 (508x610x25)
24x30x1 (610x762x25)
24x36x1 (610x914x25)
RETURN
A30
DUCT COVER
(Remove for
filter access)
A36---A42
A48---A60
To replace or inspect filters in accessory filter rack:
SMALL CHASSIS
A10063
1. Remove the filter access panel (See Fig. 3) using a 5/16--in.
nut driver.
Fig. 4 -- Small Chassis Filter Access
2. Remove the filter(s) by pulling it out of the unit. If the
filter(s) is dirty, clean or replace with a new one.
When installing the new filter(s), note the direction of the airflow
arrows on the filter frame.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When replacing filters, always use the same size and
type of filter that was supplied originally by the installer.
FILTER
ACCESS
PANEL
LARGE CHASSIS
A10062
Fig. 5 -- Large Chassis Filter Access
Filter Access Panel
For Accessory Filter Rack
Replacing or inspecting filters in units with econom-
Access Panels
izers
A09044
Small Chassis (See Fig. 4)
Fig. 3 -- Accessory Filter Rack Access Panel
1. Remove return air duct cover at rear of unit using a 5/16--in.
nut driver.
!
2. Remove the filter(s) by pulling it out and through the unit
duct opening. If filter is dirty, replace both filters with new
ones.
WARNING
FIRE AND UNIT OPERATION HAZARD
When installing the new filters, note the direction of the airflow
arrows on the filter frame, which should be pointing at the indoor
coil.
Failure to follow this warning could result in personal
injury, death or property damage.
Never operate your unit without filters in place. An
accumulation of dust and lint on internal parts of your unit
can cause loss of efficiency.
3. Reinstall duct cover ensuring opening is air and water tight.
Large Chassis (See Fig. 5)
1. Remove filter access door using a 5/16--in. nut driver.
2. Remove the filter(s) by pulling it out and through the unit
filter access door. If filter is dirty, replace both filters with
new ones.
4
Download from Www.Somanuals.com. All Manuals Search And Download.
Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25
mm) filter first and then install 24 x 16 x 1 (610 x 406 x 25) filter.
When installing the new filters, note the direction of the airflow
arrows on the filter frame, which should be pointing at the indoor
coil.
!
WARNING
EXPLOSION, BURN AND ENVIRONMENTAL
HAZARD
3. Reinstall filter access door ensuring opening is air and
watertight.
Failure to follow this warning could result in personal
injury, death or property damage.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. Use
all service ports and open all flow--control devices,
including solenoid valves.
Table 2 – Indoor Air Filter Data with Economizer
50EZ Unit Size
Filter Size
2 each 20 x 12 x 1
30---36
(508 x 305 x 25 mm)
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
1 each 24 x 16 x 1 (610 x 406 x 25 mm),
24 x 18 x 1 (610 x 457 x 25 mm)
42-48
Unit Panels
60*
After performing any maintenance or service on the unit, be sure
all panels are fastened securely in place to prevent rain from
entering unit cabinet and to prevent disruption of the correct unit
airflow pattern.
*Units with bent indoor coil.
50VT Unit Size
Filter Size
2 each 20 x 12 x 1
30
Regular Dealer Maintenance
(508 x 305 x 25 mm)
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
1 each 24 x 16 x 1 (610 x 406 x 25 mm),
24 x 18 x 1 (610 x 457 x 25 mm)
In addition to the type of routine maintenance you might be willing
to perform, your unit should be inspected regularly by a properly
trained service technician. An inspection (preferably each year, but
at least every other year) should include the following:
36-42
48---60*
*Units with bent indoor coil.
1. Inspection and, if required, cleaning of the outdoor and
indoor coils.
Fans and Fan Motor
Periodically check the condition of fan wheels and housings and
fan--motor shaft bearings. Contact your dealer for the required
annual maintenance.
2. Inspection and, if required, cleaning of the indoor coil drain
pan.
3. Inspection and cleaning of blower wheel housing and
motor.
4. Inspection of all supply and return air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service
personnel. Contact your dealer for the required annual
maintenance.
Condensate Drain
5. Inspection of the unit base to ensure that no cracks, gaps,
etc., exist which may cause a hazardous condition.
The drain pan and condensate drain line should be checked and
cleaned at the same time the cooling coils are checked by your
dealer.
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to assure
proper connection.
Compressor
All compressors are factory shipped with a normal charge of the
correct type and quantity of refrigeration grade oil. A compressor
should rarely require additional oil.
8. Inspection for leaks in the refrigerant circuit. Pressure and
temperature check to determine appropriate refrigerant
charge.
Condenser Fan
9. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this
time.
!
WARNING
Your servicing dealer may offer an economical service contract that
covers seasonal inspections. Ask for further details.
Complete service instructions can be found in the unit Installation,
Start--up and Service Instructions.
PERSONAL INJURY AND UNIT DAMAGE
HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty
carefully to determine the coverage for your unit.
Do not poke sticks, screwdrivers, or any other object into
revolving fan blades.
Before you call for service...
...check for several easily solved problems.
If insufficient heating or cooling is suspected:
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
Electrical Controls and Wiring
(
) Check for sufficient airflow. Check the air filter for dirt. Check
Electrical controls are difficult to check without proper
instrumentation. If there are any discrepancies in the operating
cycle, contact your local dealer and request service.
for blocked return or supply air grilles. Be sure they are open and
unobstructed. If these checks do not reveal the cause, call your
servicing dealer.
If your unit is not operating at all, check the following list for
easy solutions:
Refrigerant Circuit
The refrigerant circuit is difficult to check for leaks without the
proper equipment. If inadequate cooling is suspected, contact your
local dealer for service.
(
) Check to be sure that your thermostat temperature selector is
set below the indoor temperature during the cooling season or
above the indoor temperature during heating season. Be sure the
SYSTEM switch or MODE control is in the COOL or HEAT and
not OFF.
5
Download from Www.Somanuals.com. All Manuals Search And Download.
(
) If your unit still fails to operate, call your servicing dealer for
In Case of Trouble
troubleshooting and repairs. Specify the model and serial numbers
of your unit. (Record them in this manual in the space provided.) If
the dealer knows exactly which unit you have, he may be able to
offer suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
If you perform the steps above and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
C a t a l o g N o : O M 5 0 E Z --- V T --- 0 3
Copyright 2010 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 04/10
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
R e p l a ce s: OM 5 0 E Z --- VT --- 0 2
6
Download from Www.Somanuals.com. All Manuals Search And Download.
|