Carrier Heat Pump 50JZ User Manual

50JZ

Single-Packaged 50Hz, CE Electric Heat Pump Units

with Puron® (R-410A) Refrigerant

Visit www.carrier.com

A Guide to Operating and Maintaining Your

Single-Packaged Electric Heat Pump Units

NOTE: Read the entire instruction manual before starting the

installation.

2. Ice or frost tends to form on the coil during winter heating

operation. Your heat pump 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. Do not be alarmed!

SAFETY CONSIDERATIONS

Note to Installer:This manual should be left with the equipment

user.

Do not store or use gasoline or other flammable vapors and

liquids in the vicinity of these or any other appliances. Failure

to follow this warning could result in fire, serious injury, or

death.

Do not use this unit if any part has been under water.

Immediately call a qualified service technician to inspect the

unit and to replace any part of the control system which has

been under water. Failure to follow this warning could result

in electrical shock, fire, serious injury, or death.

Before performing recommended maintenance, be sure the

main power switch to unit is turned off and lockout tag

installed. Electric shock could cause serious injury or death.

C990064

STARTING OR SHUTTING UNITS OFF

1. To start either of these units:

Fig. 1—Unit 50JZ (50Hz)

a. Turn on the electrical power supply to unit.

Step 1—Cooling Mode

b. Select temperature and set SYSTEM switch or MODE

control to desired mode.

With the SYSTEM or MODE control set to COOL, your heat

pump will run in cooling mode until the indoor temperature is

lowered to the level you have selected. On extremely hot days,

your heat pump will run for longer periods at a time and have

shorter “off” periods than on moderate days.

2. To shut this unit off:

NOTE: If the unit is being shut down because of a malfunction,

call your dealer as soon as possible.

a. Set system SWITCH or MODE control to OFF.

Step 2—Heating Mode

b. Turn off the electrical power supply to unit and install

lockout tag.

With the SYSTEM or MODE control of your indoor thermostat set

to HEAT, your heat pump will run in heating mode until room

temperature is raised to the level you have selected. Of course,

your heat pump will run for longer periods to maintain a

comfortable environment on cooler days and nights than on

moderate ones.

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 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.

Step 3—Supplemental Heat

Your heat pump 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 automati-

cally turn on the supplemental heat in order to maintain the level

of comfort you have selected.

To better protect your investment and to eliminate unnecessary

service calls, familiarize yourself with the following facts:

1. During heating, increasing the thermostat 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 thermostat. Needless

use of the supplementary heat reduces potential energy sav-

ings.

When your heat pump needs additional heat to keep you comfort-

able, your Carrier electronic thermostat will turn on the supple-

mental heat (if equipped) and display the “AUX HT” message.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book

Tab 6a 8a

PC 101

Catalog No. 005–00009

Printed in U.S.A.

Form OM50-C2

Pg 1

2–02

Replaces: New

1. Inspection and, if required, cleaning of the outdoor and indoor

coils.

Neveroperate your unit without the filter(s) in place. Failure

to heed this warning may result in damage to the blower

motor and/or compressor. An accumulation of dust and lint on

internal parts of your unit can cause loss of efficiency and , in

some cases, a fire.

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-air and return-air ducts for leaks,

obstructions, and insulation integrity. Any problems found

should be resolved at this time.

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.

5. Inspection of the unit base to ensure that no cracks, gaps, etc.,

exist which may cause a hazardous condition.

6. Inspection of the unit casing for signs of deterioration.

Indoor and Outdoor Coils

7. Inspection of all electrical wiring and components to assure

proper connection.

Cleaning of the coils should only be done by qualified service

personnel. Contact your dealer for the required annual mainte-

nance.

8. Inspection for leaks in the refrigerant circuit. Pressure-check

to determine appropriate refrigerant charge.

Condensate Drain

The drain pan and condensate drain line should be checked and

cleaned at the same time the cooling coils are checked by your

dealer.

9. Inspection of compressor oil level by service person to ensure

proper oil level is maintained in the compressor when it is

installed and running.

Compressor

10. Operational check of the unit to determine working condi-

tions. Repair or adjustment should be made at this time.

All compressors are factory-shipped with a normal charge of the

correct type refrigeration grade oil. A compressor should rarely

require additional oil.

Your servicing dealer may offer an economical service contract

that covers seasonal inspections. Ask for further details.

Condenser Fan

Complete service instructions can be found in each unit’s Instal-

lation, Start-Up and Service Instructions.

BEFORE YOU CALL FOR SERVICE ...

...check for several easily-solved problems.

If insufficient heating or cooling is suspected:

Do not poke sticks, screwdrivers, or any other objects into

revolving fan blades. Injury or equipment damage may result.

The fan must be kept free of all obstructions to ensure proper

cooling. Contact your dealer for any required service.

( ) Check for sufficient airflow. Check the air filter for dirt. Check

for blocked return-air or supply-air grilles. Be sure they are open

and unobstructed. If these checks do not reveal the cause, call your

servicing dealer.

Electrical Controls and Wiring

Electrical controls are difficult to check without proper instrumen-

tations. If there are any discrepancies in the operating cycle,

contact your dealer and request service.

If your unit is not operating at all, check the following list for

easy solutions:

Refrigerant Circuit

( ) 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 SYS-

TEM switch or MODE control is in the COOL or HEAT position

and not in the OFF position.

The refrigerant circuit is difficult to check for leaks without the

proper equipment. If inadequate cooling is suspected, contact your

local dealer for service.

( ) If your unit still fails to operate, call your servicing dealer for

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.

System under pressure. Relieve pressure and recover all

refrigerant before system repair or final unit disposal to avoid

serious injury or death. Use all service ports and open all

flow-control devices, including solenoid valves.

Unit Panels

After performing any maintenance or service on either of these

units, 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.

IN CASE OF TROUBLE

If you perform the steps above and unit performance is still

unsatisfactory, shut off the unit and call your dealer.

REGULAR DEALER MAINTENANCE

Dealer’s Name ______________________________________

Telephone___________________________________________

Unit Model__________________________________________

Unit Serial Number___________________________________

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:

om50c2