Honeywell COMMERCIALPRO TB7220U - Manual (Page 13)

TB7220U COMMERCIALPRO™ PROGRAMMABLE THERMOSTAT
13 62-0221—05
OPERATION
System Settings
Heat—Thermostat controls the heating system.
Off—Both heating and cooling systems are off.
Cool—Thermostat controls the cooling system.
Auto—Thermostat automatically changes between heat
and cool operation, depending on indoor temperature.
Fan Settings
Auto —Fan runs only when heating/cooling system is on.
On—Fan runs continuously.
Table 5 shows default program settings. See Owner’s
Guide for complete instructions to change the program.
Table 5. Default Program Settings.
Minimum-Off Timer
(Compressor Protection)
The thermostat has an adjustable Minimum-Off Timer that
can be set from zero to five minutes (Factory Setting—five
minutes). The Minimum-Off Timer can be bypassed
through the Installer System Test or it can be bypassed
permanently by setting the Minimum-Off Timer to 0
minutes in the Installer Setup. The Minimum-Off Timer is
activated after the compressor turns off:
— If the thermostat is system powered (common wire),
the Minimum-Off Timer is also activated upon initial
startup and after power interruptions.
— If there is a call for cooling or heating during the
Minimum-Off Time, the thermostat displays “Wait.”
— When the Minimum Off Timer expires, “Cool On” or
“Heat On” (heat pumps only)” appears solidly in the
display and the compressor and fan turn on.
Outdoor or Indoor Temperature
Sensor
Allow outdoor or indoor temperature sensor to absorb the
air for a minimum of five minutes before taking a reading.
See the Sensor instructions for more information.
Economizer/TOD Logic (Table 6)
Table 6. Operation of Terminal A.
Heat Pump Temperature Lockouts
Dual Fuel Heat Pump and Outdoor
Sensor
In this operation, there is no external fossil fuel kit (dual
fuel kit) installed; the thermostat controls this function:
1. Choose correct heat pump application in Installer
Setup Number 0170.
2. Choose Outdoor Temperature Sensor for Heat
Pump Temperature Lockouts Option in Installer
Setup Number 0340.
3. Choose appropriate Balance Point Temperature
in Installer Setup Number 0350.
OPERATION IN HEAT MODE ABOVE BALANCE
POINT (OUTDOOR TEMPERATURE)
When the outdoor temperature is above the selected
Balance Point Temperature (ISU 0350), only the
compressor operates and the fan (G terminal) energizes
when the thermostat calls for heat.
OPERATION IN HEAT MODE BELOW BALANCE
POINT (OUTDOOR TEMPERATURE)
When the outdoor temperature is below the selected
Balance Point Temperature (ISU 0350), only the Fossil
Fuel (auxiliary heat) operates and the fan (G terminal)
does not energize when the thermostat calls for heat.
Heat Pump with Auxiliary (Backup) Heat
and Outdoor Temperature Sensor
1. Choose correct heat pump application in Installer
Setup Number 0170.
2. Choose Outdoor Temperature Sensor for
Control Option in Installer Setup Number 0340.
3. Choose Compressor Lockout Temperature in
Installer Setup Number 0350.
4. Choose Auxiliary Lockout Temperature in
Installer Setup Number 0360.
NOTE: There is a 5°F deadband between 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.
— Above the Auxiliary Lockout Temperature, only the
Compressor operates. See Fig. 31.
— Between the two temperatures, both the Compressor
and Auxiliary Heat operate.
Fig. 25. Heat Pump Operation with Lockout
Temperatures Set.
Schedule
Period Time
Setpoints
Fan
Setting Heat Cool
Occ1 8:00am 70°F
(21°C) 75°F
(25.5°C) On
Unocc1 10:00pm 55°F
(10°C) 85°F
(24°C) Auto
Occ2 1:00pm 70°F
(21°C) 75°F
(25.5°C) On
Unocc2 12:00pm
(Noon) 55°F
(10°C) 85°F
(24°C) Auto
Effective
Occupancy
Call for
Cool
Terminal A
Economizer TOD
Occupied — Energized Energized
Unoccupied Yes Energized De-energized
No De-energized De-energized
Override — Energized Energized
35
M19950
COMPRESSOR
LOCKOUT
TEMPERATURE
AUXILIARY
LOCKOUT
TEMPERATURE
COMPRESSOR ONLY
BOTH COMPRESSOR AND
AUXILIARY HEAT
AUXILIARY ONLY
50
OUTDOOR TEMPERATURE