Honeywell VisionPRO 8000 Product Data page 34

TM
VisionPRO 8000 Touchscreen Programmable Thermostat
OPERATION IN EMERGENCY HEAT MODE
The balance point (outside) temperature is not used in the
Emergency heat mode. When the thermostat is moved to the
Emergency Heat position, the compressor is locked out. The
first stage of heat is whatever is connected to the E terminal.
The second stage of heat is what is connected to the Aux.
terminal. Often there is only one source of non-compressor
heat and the E terminal is jumped to the Aux. terminal.
Heat Pump with Electric Auxiliary (Backup) Heat and
Outdoor Temperature Sensor
1. Choose correct heat pump application in Installer Setup
Number 0170.
2. Choose Electric as Auxiliary (Backup) Heat Source in
Installer Setup Number 0200.
3. Choose Outdoor Temperature Sensor for
Control Option in Installer Setup Number 0340.
4. Choose Compressor Lockout Temperature in
Installer Setup Number 0350.
5. Choose Auxiliary Lockout Temperature in Installer
Setup Number 0360.
NOTE: There is a 5°F deadband between the Compressor
and Auxiliary Heat Lockout Temperatures.
Operation in Heat Mode
When the outdoor temperature is below the Compressor
Lockout Temperature, only the Auxiliary Heat operates.
When the outdoor temperature is above the Auxiliary Lockout
Temperature, only the Compressor operates. See Fig. 34.
System Setting Fan Setting
Off Auto
Cool Auto
Cool or Auto Auto
Cool or Auto Auto
Heat Auto
Heat or Auto Auto
Heat or Auto Auto
a
G energizes only if Installer Setup number 0180 is set to Electric.
b
If Installer Setup System type is set to two stages of cooling.
c
If Installer Setup System type is set to two stages of heating.
68-0280—01
Table 9. Sequence of Operation for Conventional Systems.
Call for Action
None
None
Stage 1 Cooling
Stage 1 and Stage 2 Cooling
None
Stage 1 Heating
Stage 1 and Stage 2 Heating
COMPRESSOR ONLY
50
BOTH COMPRESSOR AND
AUXILIARY HEAT
35
AUXILIARY ONLY
Fig. 34. Heat Pump Operation with Lockout
When the outdoor temperature is between the two
temperatures, both the Compressor and Auxiliary Heat
operate.
Operation in Emergency Heat Mode
Once the thermostat is placed into the Emergency Heat
mode, the compressor and auxiliary lockout features are
turned off. In the Emergency heat mode, the compressor is
locked out. The first stage of heat is whatever is connected to
the E terminal. The second stage of heat is connected to the
Aux. terminal. Usually the emergency and auxiliary heat
sources are electric strip heat in these cases.
Operating Sequence
The thermostat energizes specific terminal(s), depending on
the demand for heating, cooling or fan. The thermostat screen
shows the time, inside temperature, system and fan
selections. Additional indicators are shown when the heating,
cooling or fan is energized. See Tables 9 - 11 for specification
information.
Energize Terminals
None
None
Y, G
b
Y, Y2 , G
None
a
W, G
c
W, W2 , G
34
AUXILIARY
LOCKOUT
TEMPERATURE
COMPRESSOR
LOCKOUT
TEMPERATURE
Temperatures Set.
Screen Message
None
None
Cool On
Cool On
None
Heat On
Heat On
a
M19950