Carrier 48JZ030060300, 48JZ036060300, 48JZ048115300, 48JZ060115300, 48JZ060130300 Owner’s Manual

48JZ

HEATING & COOLING

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Unit with Puron (R-410A) Refrigerant

A Guide to Operating and Maintaining Your

Single-Packaged Gas Heat/Electric Heat Pump Unit

NOTE: Read the entire instruction manual belbre starting the

installation.

SAFETY CONSIDERATIONS

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

user.

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Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance. Failure to
lk)llow this warning could result in fire, serious injury, or

death.

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

Single-Packaged Gas Heat/Electric Heat Pump

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Before performing recommended nmintenance, be surc the
main power switch to unit is turned off and lock-out tag
installed. Electric shock could cause serious injury or death.

UNIT INTRODUCTION

Tiffs 48JZ unit is a small packaged gas heat/electric heat pump

system that can utilize both the efficiency ol' heat pump heating
and the comfort of gas heating. The system will optimize lk)r ideal
heating, depending on several factors. This unit uses Puron_Z the
ozone friendly refrigerant lbr cooling and heat pump heating.

Starting or Shutting Unit Off

1. To start the unit:

a. Turn on the electrical and gas power supply to unit.

b. Select temperature and set SYSTEM switch or MODE

control to desired mode.

2. To shut 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.

b. Turn off the electrical power, install lock-out tag and shut

olT gas supply to unit.

OPERATING YOUR UNIT

The operation ol' your system is controlled by the indoor tempera-

ture control (lk_r 48JZ, either a Tt_ermidistat TM or dual fuel
thermostat is required). You simply adjust the thermostat and it
maintains the indoor temperature at the level you select. Most
thermostats of heating and cooling 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

inlkmnation.

C99088

Fig. 1--Unit 48JZ

To better pn)tect your in'vestment and to eliminate um]ecessary
service calls, familiarize yourself with the following facts:

1. During heat pump heating, increasing the thermostat setting
more than 2°F may cause the supplemental gas heat to be
turned on for a short period ol' time to satisl_ the thermostat.
Needless use of the supplementary heat reduces potential
energy savings.

2. Ice or frost tends to lbrm 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!

Step 1--Cooling Mode

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
lk_r longer periods at a time and have shorter "ofl" periods than on

moderate days.

Step 2--Heat Pump Heating Mode

With the SYSTEM or MODE control ol' your indoor thermostat set
to HEAT, your unit will run in heat pump heating mode until room
temperature is raised to the level you have selected. Of course,
your system will run for longer periods to maintain a comfortable
environment on cooler days and nights than on moderate ones.

Step 3--Gas Heat Mode

Your heat pump is your primary heating source. Your system is
also be equipped with a supplemental gas heating source. On cold
days and nights, your system will automatically turn on the
supplemental heat in order to maintain the level ol' comlk)rt you

have selected.

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

PC 101 Catalog No. 534-80084 Printed in U.S.A. Form OM48-15 Pg 1 10-01 Replaces: New

When your heat pump needs additional heat to keep you comlk)rt-
able, your Carrier electronic thermostat will turn on the supple-

mental gas heat and display the "AUX HT" message.

Step 4--Defrost Mode

When your heat pump is providing heat to your home or office and

the outdoor temperature drops below 45°F, moisture may begin to

freeze on the surlitce of the coil. If allowed to build up, this ice
would impede airflow across the coil and reduce the mnount ol'
heat absorbed from the outside air. So, to maintain energy-efficient

operation, your heat pump has an automatic defrost mode.
The del_'ost mode starts at a preset time interval of 30 minutes,

although, it may be reset to 60, 90 or 120 minutes. Defrost will
start at the preset time only il' the ice is sufficient to interlEre with
normal heating operation.

After the ice is melted fronl the coil, or al_er a maximnm ol' 10
minutes in defrost mode, the nnit automatically switches back to

normal heating operation.
Do not be alamled 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.

During certain weather conditions such as heavy snow and

freezing rain it is not uncommon lk_r ice to build up on the unit
grille. This is normal lk_r these weather conditions. Do not attempt
to remove the ice from the unit grille. This condition will not affect
the proper function ol' the nnit and will clear within a few days.

Step 5--Emergency Heat Mode

If you should have problems with the heat pump portion ol' your

system, this mode allows your supplemental gas heating source to

keep your home or office warm until your heat pump can be

serviced.

MAINTENANCE AND SERVICE

This section discusses maintenance that should be performed on

your system. Most maintenance should be perlimned by your

dealer. You, as the owner, may wish to handle some minor

maintenance for your new unit.

ROUTINE MAINTENANCE

All routine maintenance should be handled by skilled, experienced

personneh Your dealer can help you establish a standard proce-

dure.

For your sali.,ty, keep the unit area clear and l)_ee of combustible

materials, gasoline, and other flammable liquids and vapors.
To assure proper functioning of the unit, flow of condenser air

must not be obstructed from reaching the unit. Clearance from the
top ol' the unit is 48 in. Clearance of at least 36 in. is required on

sides except the power entry side (42 in. clearance) and the duct

side (12 in. minimum clearance).

MAINTENANCE AND CARE FOR THE EQUIPMENT

OWNER

Before proceeding with those things you might want to maiutain

yourself, please caretMly consider the lk)llowing:

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1. TURN OFF ALL ELECTRICAL POWER TO YOUR
UNIT AND INSTALL LOCK-OUT TAG BEFORE SER-
VICING OR PERFORMING MAINTENANCE. ELEC-
TRIC SHOCK COULD CAUSE SERIOUS INJURY OR
DEATH.

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 keep
sharp edges to a minimum, be extremely careful when
handling parts or reaching into the nnit.

Air Filters

The air filter(s) should be checked at least 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. Table 1 indicates the correct
filter size lbr your unit. Refer to Fig. 2 to access the filters.

Table I--Indoor-Air Filter Data

UNIT SIZE FILTER SIZE

48JZ024-030 20 x 20 x 1

48JZ036 20 x 24 x 1

48JZ042-060 24 x 30 x 1

ACCESSPANEL

FILTER ACCESS
PANEL*

*For accessory filter rack.

C99094

Fig. 2--Filter Access Panel-Vertical Supply Shown

To replace or inspect filters (or accessory filter rack when
supplied):

1. Remove the filter access panel using a 5/16-in. nut driver.

2. Remove the filter(s) by pulling it out ol' the nnit. If the filter(s)
is dirty, clean or rcplace 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 rcplacing filters, always use the same size and
type of filter that was supplied, originally, by the installer.