An Auto Cycle setting is available for both the heating and cooling cycles.
This setting determines the optimum number of cycles per hour to balance
temperature swings and equipment cycles.
Early Start
The Early Start function for heating
ensures that the zone is up to the
proper temperature at the beginning
of each period. The controller learns
the recovery rate over multiple
setback events in order to determine
the proper lead time for the zone.
If an air sensor and a slab or floor sensor are used, the lead time is the
greater of the air, slab or floor sensor’s requirements.
The Early Start function for cooling allows the cooling system to turn
on 30 minutes prior to the beginning of a period that requires cooling.
(See
Figure 11
.)
Note:
The Early Start feature occurs when the schedule changes from
a low temperature to a higher temperature.
Optional Sensors
Each controller has a single built-in sensor to measure air temperature.
In addition to this built-in sensor, the controllers feature terminals to
connect one additional sensor (i.e., indoor sensor, outdoor sensor, slab or
floor sensor or sensor placed in a remote location).
Indoor Sensor
An indoor sensor measures the air temperature in the zone that the
SetPoint is controlling. The temperature measured by the outdoor sensor
is used in the on-time calculations for the relay in the controller. Select this
setting on the Adjust menu. If the built-in sensor is on and the auxiliary
sensor is set to Indoor, the temperatures of the sensors are averaged and
used to calculate the on time of the relay.
Outdoor Sensor
An outdoor sensor measures the temperature of the air outside. The
temperature measured by the outdoor sensor does not affect the on time
of the relay and is only used for display purposes.
Slab or Floor Sensor
A slab or floor sensor measures the slab or floor temperature in the zone
that the controller is controlling. The temperature the slab or floor sensor
reads is used in the on-time calculations for the Heat relay and allows the
controller to operate the slab between the minimum and maximum
slab settings.
9
Section 2 — Installation
Display and Keypad Operation
The SetPoint 511s and 512 Controllers feature four fields: Menu, Item,
Number and Status. (See
Figure 9
.)
Cycles per Hour
The SetPoint 511s and 512
controllers operate on cycles per hour.
The number of cycles per hour is
adjustable through the Heat Cycle
and Cool Cycle (SetPoint 512 only)
settings in the Adjust menu. During
each cycle that heating or cooling is required, the controller turns on the
Heat or Cool relays for a calculated amount of time. This amount of time
is called the on time. The on time is calculated based on the requirements
of the zone. If the zone requires more heating or cooling, the appropriate
on time is increased. If the zone requires less heating or cooling, the
appropriate on time is reduced. (See
Figure 10
.)
The controllers ensure the relays remain on or off for a minimum amount of
time to prevent short cycling. For the SetPoint 512, the minimum cooling
on-and-off time settings are adjusted in the Adjust menu to prevent short
cycling of the Cool relay.
8
Menu Field
Displays the
current menu
Item Field
Displays an
abbreviated
name of the
selected item
Status Field
Displays the current
status of the
thermostat’s inputs,
outputs and operation
Buttons
Selects menus, items
and adjusts settings
Number Field
Displays the
current value of
the selected item
Figure 9: SetPoint Controller Fields and Display
Cycles Per Hour
Time
off
off
off
on
on
on
Figure 10: Cycles per Hour
Display Symbols
Warning
Displays when an
error exists
Access Level
Displays when in the
User access level
Early Start
Displays when in
Early Start
Heat 1
Displays when the
Heat 1 contact is on
Heat 2 (512 Only)
Displays when the
Heat 2 contact is on
Cool 1 (512 Only)
Displays when the
Cool 1 contact is on
Figure 11: Early Start Function
Содержание SETPOINT 511S
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