Definitions of terminal functions, Function, Stage heat – Honeywell CT8611 User Manual
Page 5: Auxiliary heat, Stage cool, Compressor, C/0 valve heat, C/o valve cool, Em. heat, Definition
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DEFINITIONS OF TERMINAL FUNCTIONS
Each terminal of the CT8611 controls a different heat pump
function. Here is a listing of the possible heat pump functions;
Function
STAGE HEAT:
AUXILIARY HEAT:
STAGE COOL;
COMPRESSOR;
C/0 VALVE HEAT:
C/O VALVE COOL:
EM. HEAT:
Definition
When this terminal is activated, the
heat pump is on and providing heating
to the living space.
When this terminal is activiatsd, the
auxiliary heating source is on because
the heat pump is unable to meet the
heating demand of the living space.
When this terminal is activated, the
heat pump is on and providing
cooling to the iiving space.
When this terminal is activated, the
heat pump is on and providing either
heating or cooling to the living space,
depending on Ifie system switch
position.
Heating Changeover Valve. This
terminal is activated when the
system switch is in the HEAT position.
It provides changeover in heat pumps
that changeover in heating.
Cooling Changeover Valve. TTiis
terminal is activated when the
system switch is in the COOL position.
It provides changeover in heat pumps
tfiat changeover in cooling.
Emergency Heat. This terminal is
activated when the system switch is
in the EM. HT position, in this situation,
the heat pump will not be activated.
FAN:
MULTIPLE
AUX. HEAT
LOADS:
OUTDOOR SENSOR:
OUTDOOR STAT:
POWER;
COMMON:
SYSTEM MONITOR:
When this terminal is activated, the
fan is on. With the fan switch in the
AUTO position, the tan cycles on and
off with the heat pump, VVith the fan
switch in the ON position, the fan is
on continuousty.
This terminal is activated when
additional auxiliary heat loads are
required. Since the CT86 M only has
provisions for one auxiliary heat load,
these loads must be connected to the
AUXILfARY HEAT terminal.
This terminal is not connected to the
CT8611. On your original thermostat,
this terminal was activated by an
outdoor sensor that controlled the
auxiliary heat source.
Outdoor Thermostat. This terminal is
activated when the system switch is in
the EM, HT. position. The outdoor
thermostat controls the amount of
auxiliary heat that will be activated.
This terminal connects to the power
side of the 24-volt transformer
This terminal connects to the common
side ot the 24-volt transformer.
Some heat pumps have the ability to
indicate when the heat pump is
malfunctioning. When this occurs, this
terminal is activated and the CHECK
LED is activated.