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Reverse Acting (RA) and Direct Acting (DA)
Outputs
All TCN-890x thermostats provide two outputs for
applications using separate heating or cooling
actuators. Refer to Figure 12 or Figure 13, and
connect the heating actuator to the RA output,
Terminal 3, and connect the cooling actuator to the
DA output, Terminal 5. Seasonal changeover of the
thermostat is not required.
•
For TCN-890x operation with two actuators,
open the RA/DA input, Terminal 7, shown in
Figure 12 and Figure 13.
•
For TCN-890x operation with one actuator for
heating and cooling with a changeover control,
refer to Figure 12 or Figure 13 and:
−
connect the actuator to the RA output,
Terminal 3 and Terminal 4
−
connect the seasonal changeover control to
terminal 7 and Terminal 8
Note:
RA/DA input activation reverses Terminal 3
and Terminal 5 output functions. In RA (Reverse)
mode Terminal 3 is the heating (RA) output and
Terminal 5 is the cooling (DA) output. In DA (direct)
mode, Terminal 3 is the cooling (DA) output and
Terminal 5 is the heating (RA) output. The PB/RA or
DIF/RA potentiometer (Figure 14or Figure 15) always
adjusts the Terminal 3 output, and the PB/DA or
DIF/DA potentiometer always adjusts the Terminal 5
output.
−
open the contact of the changeover control to
set the unit for RA (Heating) operation
−
close the contact of the changeover control to
set the unit for DA (Cooling) operation
Setpoint Dial
Adjust the setpoint dial to the desired temperature,
(see Figure 1). If limiting the setpoint range is
desirable, order and install the Dial Stop Screw Kit
accessory, TM-9100-8901.
Occupied Mode
The thermostat will maintain the setpoint temperature
when in the Occupied Mode. (See Figure 16 and
Figure 17.)
When the Occupied Mode is enabled the thermostat
controls at the setpoint.
6
TCN-890x Electronic Room Thermostats Installation Instructions
Unoccupied Mode
In the TCN-890x, the Unoccupied Mode offsets the
setpoint by 9F° (5C°). (See Figure 16 and Figure 17.)
The setpoint is decreased for the RA (heating) output
and increased for the DA (cooling) output.
To use the Unoccupied Mode, refer to the
appropriate wiring diagram (Figure 12 or Figure 13)
and:
•
remove the factory-installed jumper connecting
Terminal 8 and Terminal 9 on the screw terminals
•
connect the unoccupied control or timer across
Terminal 8 and Teminal 9
When the unoccupied control contact at terminal 9
is open, the Unoccupied Mode is enabled, and:
•
the thermostat controls at the offset to the setpoint
•
on startup, the thermostat will start in the
Unoccupied Mode
When the unoccupied control contact at terminal 9
is closed, the Unoccupied Mode is disabled and the
thermostat controls temperature at the setpoint.
Compliance Statements
FCC Compliance Statement
This equipment has been tested and found to
comply with the limits for a Class A digital device
pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection
against harmful interference when the equipment is
operated in a commercial environment. This
equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in
accordance with the instruction manual, may cause
harmful interference to radio communications.
Operation of this equipment in a residential area is
likely to cause harmful interference, in which case
the user will be required to correct the interference at
his/her own expense.
Canadian Compliance Statement
This Class (A) digital apparatus meets all
requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la classe (A) respecte
toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
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