Optional Sensors (501s Only)
Each controller has a single built-in sensor to measure air temperature.
In addition to this built-in sensor, the SetPoint 501s features 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.
Access Levels (501s Only)
The SetPoint 501s features two access levels —
User and Installer — which restrict the number
of items available in the display menus. Change
the access level via the DIP switch located on
the circuit board inside the controller. (See
Figure 9
.)
The Installer access level allows the installer to
adjust all the settings in the controller including
those required to match the controller to the
mechanical system and devices. The User access
level allows the end user to adjust the
temperature settings.
7
Section 2 — Installation
Display and Keypad Operation
The SetPoint 501 and 501s Controllers feature four fields: Menu, Item,
Number and Status. (See
Figure 7
.)
Cycles per Hour
The SetPoint 501 and 501s controllers operate on cycles per hour. The
number of cycles per hour is adjustable through the Heat Cycle setting in
the Adjust menu. During each cycle that heating is required, the controller
turns on the Heat relay 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, the appropriate on time is
increased. If the zone requires less
heating, the appropriate on time is
reduced. (See
Figure 8
.)
The controller ensures the relay
remains on or off for a minimum
amount of time to prevent
short cycling.
An Auto Cycle setting is available for the heating cycle. This setting
determines the optimum number of cycles per hour to balance temperature
swings and equipment cycles.
6
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 7: Wiring the Zone Control Module (ZCM)
Cycles Per Hour
Time
off
off
off
on
on
on
Figure 8: Cycles per Hour
50
1s
Figure 9:
DIP Switch Location
Display Symbols
Warning
Displays when
an error exists
Access Level
(501s Only)
Displays when
in the User
Access Level
Heat 1
Displays when
the Heat 1
contact is on
