T60xDFH-4 and T60xDFH-4+PIR Series Thermostat Controllers with Dehumidification and Occupancy
Sensing Capability Installation Instructions
8
Status Display Menu
The Status Display Menu is displayed during normal
thermostat controller operation. This menu
continuously scrolls through the following parameters:
•
Room Temperature (All Models) and Humidity
(T603DFH-4 and T605DFH-4 Models)
Note:
For models with dehumidification capability, the
default setting is no humidity reading on the display
(
%RH disp
parameter is set to
off
). The
%RH disp
parameter must be set to
on
to display the current
humidity reading.
•
System Mode
•
Schedule Status
(Occupied/Unoccupied/Override/Stand-By
[PIR Models])
•
Applicable Alarms – The backlight lights up as an
alarm condition is displayed.
Note:
An option is available within the Installer
Configuration Menu to lock out the scrolling display and
show only the
Room Temperature
parameter.
Dehumidification Operation – T603DFH-4 and
T605DFH-4 Thermostat Controller Models
Dehumidification activates when the room humidity is
above the adjustable humidity setpoint as sensed by
the integral humidity sensor.
Note:
Dehumidification operation functions only in the
Cooling mode; dehumidification operation does not
function in either the Off or the Heating mode.
The minimum deadband between the Heating and
Cooling setpoints is adjustable from 2.0F°/1.0C° to
5.0F°/2.5C°, as defined by the
Deadband
parameter in
Table 4. If the room temperature resides in the
deadband between the Heating and Cooling setpoints:
•
the thermostat controller forces the fan to low
speed
•
the chilled water valve opens to the specified
maximum value set by
CoolMax
•
the thermostat controller stages Heating to
maintain the room temperature at the Cooling
setpoint, as sensed by the thermostat controller
If the room temperature falls below the result of the
formula
1 + Cooling Setpoint – Deadband
, then the
thermostat controller disables dehumidification
operation.
If the thermostat controller is in Cooling demand:
•
the chilled water valve opens to 100%
•
the thermostat controller stages Heating to
maintain the room temperature at the Cooling
setpoint, as sensed by the thermostat controller
If the thermostat controller is in Cooling demand and
the room temperature rises 2F°/1C° above the Cooling
setpoint, the thermostat controller automatically
disables dehumidification operation. Likewise, if the
thermostat controller is in Cooling demand and the
room temperature falls below the current Heating
setpoint, the thermostat controller disables
dehumidification operation.
Occupancy Sensor Operation –
T60xDFH-4+PIR Thermostat Controllers
A T60xDFH-4+PIR Series Thermostat Controller (or a
T60xDFH-4 Series Thermostat Controller equipped
with a PIR accessory cover) provides advanced
occupancy logic.
Note:
The PIR strategy is an occupied strategy. If the
thermostat controller is programmed to be Unoccupied,
the PIR function does not have an effect on the
occupancy strategy.
The thermostat controller automatically switches
occupancy levels from Occupied to Stand-By and
Unoccupied as required, when local movement is
sensed.
Occupancy sensing is enabled only if a PIR cover is
installed on the thermostat controller (PIR models) or if
a remote input is configured as a remote PIR sensor
(
MotionNO
or
MotionNC
).
PIR Warm-Up Period
When a PIR cover is used and a thermostat controller
is powered up, there is a 1-minute warm-up period
before any local movement can be detected and
acknowledged by the PIR sensing device. The local
status LEDs for the PIR function are not active, and the
sensor is in Stand-By mode for the 1-minute period.
The PIR functionality and local movement status LEDs
are activated after the 1-minute warm-up period has
elapsed after the initial powering of the thermostat
controller. If movement is present, the mode changes
to Occupied.
PIR Diagnostic LEDs
The diagnostic LEDs inside the PIR lens brighten when
movement is detected within the first 30 minutes after
powerup. The LEDs do not light up or brighten after the
initial 30-minute period.
