Section 3
Navigating the Menus
View Menu
ROOM TARGET
This displays the current desired air temperature
for the space (one active air sensor required). This
is only available when in the Installer access level.
(See
Figure 10
.)
ROOM
This displays the current air temperature for the
space that is the average of all active air sensors
(one active air sensor required). (See
Figure 11
.)
OUTDOOR (501s Only)
This displays the current temperature at the
outdoor sensor. An outdoor sensor must be
installed for this menu to function.
(See
Figure 12
.)
Note:
SENS must be set to OUT.
SLAB (501s Only)
This displays the current slab or floor temperature
(one active air sensor required). If two slab or
floor sensors are present, this is the average
temperature. MIN is displayed when the slab or
floor minimum temperature is calling for heat.
The slab or floor sensor may call for heat even
though the room setpoint temperature is satisfied.
(See
Figure 13
.)
Adjust Menu
MODE
This displays the current mode of operation of
the thermostat. (See
Figure 14
.)
OFF, HEAT
9
Section 3 — Navigating the Menus
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Sequence of Operation
Air Sensor Only Operation
When operating with only an air sensor, the on time for the Heat relay is
calculated to satisfy the requirements of the air sensor.
Slab or Floor Sensor Only Operation (501s Only)
When operating with only a slab or floor sensor, the on time for the Heat
relay is calculated to satisfy the requirements of the slab or floor sensor.
The controller operates to maintain the slab at the minimum slab
temperature setting.
Note:
Using only a slab or floor sensor may cause overheating or
underheating of the space.
Air and Slab or Floor Sensor Operation (501s Only)
When operating with both air and slab or floor sensors, the controller
calculates an on time for the Heat relay to satisfy the slab or floor sensor’s
requirements and an on time to satisfy the air sensor’s requirements. The
Heat relay operates for the longer of these two on times.
During light heating loads, overheating can occur due to the minimum slab
or floor temperature requirements.
During heavy heating loads, the maximum slab or floor temperature
setting limits the on time of the Heat relay. In this situation, underheating
can occur.
Mode
Heat
In the heat mode, the Heat relay satisfies the temperature requirement of
the zone.
Off
The Heat relay does not operate in the Off mode.
Note:
If an air, slab or floor sensor is active in the Off mode, a freeze-
protection function enables, allowing the Heat relay to operate
and keep the zone above 35°F (2°C).
8
