Heat Pump
Manual
Comfort
Center
Owner’s Guide
& Information
ASYSTAT655A
DO NOT REMOVE
Welcome . . . to the family of
homeowners who enjoy American-
Standard home comfort products.
We sincerely believe that the
American-Standard Heat Pump
System will give you many years of
reliable service.
This booklet has been prepared
with the homeowner in mind. We
hope it will help you understand the
system, assist you in obtaining its
most efficient operation, and serve
as a guide should you have
questions or problems concerning
the system.
How To Operate Your American-Standard
Control Center Thermostat
Setting the Temperature
Set the Temperature Selector at the
indoor temperature you wish to
maintain.
Set the System Selector to HEAT or
COOL as weather conditions
require.
(A) Temperature Selector
(B) Temperature Indicator
(C) System Selector
(D) Fan Switch
(E) Normal/Emergency Heat
Switch
(F) Auxiliary Heat Light
(G) Emergency Heat Light
Setting the Fan Switch
The Fan Switch may be set at
either “AUTO” or “ON.”
When the Fan Switch is set to
AUTO, the indoor air handler fan
will cycle “on” and “off” with the
American-Standard heat pump
outdoor section. This “ON” and
“OFF” cycle is controlled by the
thermostat as it operates the
system to maintain the selected
indoor temperature.
Setting the Fan Switch (cont’d)
When the “FAN” switch is set to
“ON”, the indoor air handler fan
operates continuously (even when
the System Switch is set at “OFF”).
Setting the Fan Switch in the “ON”
position is desirable if your system
includes an electronic air cleaner
and/or powered humidifier since
continuous air circulation effects a
more continuous operation of
these items.
To turn the heat pump “OFF”, set
the System Switch to the “OFF”
position and set the Fan Switch to
“AUTO” position.
EMERGency Heat — (Red Light)
USE SWITCH ONLY IF HEAT
PUMP IS INOPERATIVE, BUT
NOT DUE TO A POWER FAILURE.
This feature allows you to “Turn
On” the electric heat section of the
system in the event the Heat
Pump should require service
during the heating season. This
switch should remain in the
NORMal position at all times
except when service is required.
CAUTION: Do not use this switch
for normal heating purposes.
Under normal conditions it
increases energy usage by
preventing the heat pump from
operating.
AUXiliary Heat — (Blue Light)
Auxiliary heaters will assist the
heat pump in normal system
operation when low outdoor
temperature occurs, or when the
thermostat setting has been
increased. When this occurs, the
blue light will come on indicating
auxiliary heaters have been
energized.
If the blue light comes on when
adjusting the thermostat upward,
you will save money by reducing
the adjustment change and
allowing the heat pump to
increase the room temperature
without the electric resistance
heaters.
It is natural in cold weather, below
40°F. (4°C) outdoors, for the blue
light to cycle “ON” and “OFF”. If the
blue light stays on constantly
above 30°F. (–1°C) or cycles “ON”
when the outdoor temperature is
above 50°F. (10°C), you should
have your servicer check the
system.
How the Heat Pump Operates
The heat pump helps collect heat
and transfers it from one place to
another. In winter, the heat pump
helps take heat from the outside
air (even at temperatures below
zero) and transfers it inside the
house. It takes considerably less
energy to transfer heat than it
does to generate heat. Depending
on location and equipment, the
American-Standard heat pump
can deliver 11/2 to +3 BTU’s of
heat energy for each BTU of
electric energy consumed. In
summer, the heat pump reverses
its cycle; removes heat from inside
the house and transfers it
outdoors, just like a conventional
air conditioner.
How it heats
The heating process involves two
stages.
Stage 1 — The refrigerant coil in
the outdoor section absorbs heat
from the outside air. The
compressor transfers this heat to
the indoor section. Then the fan
moves the warmed air through the
house.
Stage 2 — The BLUE light will
glow automatically when the
electric heaters are assisting the
American-Standard heat pump
unit maintain the comfort level of
the thermostat setting. This will
occur when there has been a
significant heat loss from the
structure, and when the
thermostat HEAT selector has
been abruptly moved up 3°F.
(1.6°C) or more.
How it cools
The circulating fan and coil extract
heat and moisture from the house
like a conventional central cooling
unit. This moisture is condensed
on the coil in the indoor section
and is piped to the drain. The
compressor transfers the
extracted heat to the outdoor coil
where the fan expels the heat to
the atmosphere.
How air moves
Supply Air — Conditioned air is
carried from the unit to each room
through the ductwork and enters
the room through the registers.
Return Air — Air goes back to the
unit through the return grille(s). A
filter in the return ductwork (or an
electronic air cleaner) filters the air
before it goes into the unit.
The heat pump system
discharges greater volumes of air
at lower temperatures than oil or
gas furnaces, thus the heat pump
avoids hot blasts of air and
maintains more even
temperatures throughout the
home.
Automatic Defrost
During the heating cycle and
under normal conditions of high
humidity or freezing rain which
occurs at about 30 to 40°F. (–1 to
4°C) outdoor temperature, there
may be a frost build-up on the
outdoor coil. Your unit will
AUTOMATICALLY reverse itself
and go into a defrost operation.
This normally will not last for more
than a few minutes. During defrost
it is quite possible that the supply
air will be cool which is normal.
Also under certain temperature
and humidity conditions, there will
be an emission of condensate
vapor from the outdoor unit. THIS
IS NORMAL. This condensate
vapor cloud, although of short
duration, can be quite large so do
not become alarmed. It is a good
indication that the unit is
functioning properly.
Things you should know about your
American-Standard Heat Pump
1. It is important to keep the power
to the outdoor unit ON at all times
to prevent damage to the
compressor. Use your thermostat
to shut the system off rather than
the electric disconnect.
2. To reduce the operation of your
Heat Pump system to a minimum
for short periods — with the
System Switch in HEAT position,
set the Temperature Selector to
the lowest temperature setting;
with the System Switch in the
COOL position, set the
Temperature Selector to the
highest temperature setting.
3. When operating in cooling, your
unit will begin removing heat and
humidity immediately after it is
turned on but may require several
hours to remove the heat stored in
walls, furniture, rugs, draperies,
etc.
Installation Record
Model No. __________________
Serial No.___________________
Date Installed _______________
Date System put into
operation ___________________
Installed by—
Company: __________________
Address: ___________________
Phone:_____________________
Authorized American-Standard
Servicer —
Company: __________________
Address: ___________________
Phone:_____________________
American-Standard
Manual Thermostat
Model No. ASYSTAT655A
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
© American Standard Inc. 1997
Pub. No. 12-5009-03
74-304 339-001
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