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50JS
Single-Packaged
50Hz Electric Heat Pump Units
A Guide to Operating and Maintaining Your
Single-Packaged Electric Heat Pump Units
NOTE: Read the entire instruction manual before starting the
installation.
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 lock-out tag
installed. Electric shock could cause serious injury or death.
STARTING OR SHUTTING UNITS OFF
1. To start this unit:
a. Turn on the electrical power supply to unit.
b. Select temperature and set SYSTEM switch or MODE
control to desired mode.
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.
b. Turn off the electrical power supply to unit and install
lock-out tag.
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.
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.
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!
Step 1—Cooling 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.
Step 2—Heating Mode
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.
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.
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.
Fig. 1—Unit 50JS (50Hz)
C99001
Visit www.carrier.com
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 101 Catalog No. 005–00001 Printed in U.S.A. Form OM50-30 Pg 1 12–01 Replaces: New