
Sequence of Operation for the SetPoint 512
(Heat and Cool) Controller
Use the DIP switch located on the circuit board inside the thermostat to
select the Heat and Cool mode of operation.
Air Sensor Only Operation
When operating with only an air sensor, the on times of the Heat 1
relay and the Cool relay are calculated to satisfy the requirements of the
air sensor.
Slab or Floor Sensor Only Operation
When operating with only a slab or floor sensor, the on time of the Heat 1
relay is calculated to satisfy the requirements of the slab or floor sensor.
The SetPoint 512 operates to maintain the slab or floor at the minimum
slab temperature setting.
Note:
When operating with only a slab or floor sensor, the Cool relay does
not operate. Operating with only a slab or floor sensor can lead to
either overheating or underheating of the space.
Air and Slab or Floor Sensor Operation
When operating the air and slab or floor sensors concurrently, the
controller calculates an on time for the Heat 1 relay to satisfy the slab
or floor sensor’s requirements and an on time to satisfy the air sensor’s
requirements. The Heat 1 relay operates for the longer of these two on
times. The controller also calculates an on time for the Cool relay to
satisfy the air sensor’s requirements. In this situation, heating and cooling
can happen at the same time to prevent the space from overheating.
This is most likely to occur when the slab is operating at the slab
minimum temperature.
While the minimum slab temperature is satisfied, the Heat 1 relay on time
is calculated to satisfy the air temperature setting. However, the maximum
slab temperature setting limits the Heat 1 relay on time when the slab
temperature becomes too warm. In this situation, underheating can occur
in the space.
13
Section 2 — Installation
Air Sensor Only Operation
When operating with only an air sensor, the on times for the Heat 1 and
Heat 2 relays are calculated to satisfy the requirements of the air sensor.
Slab or Floor Sensor Only Operation
When operating with only a slab or floor sensor, the on times for the Heat
1 and Heat 2 relays are calculated to satisfy the requirements of the slab or
floor sensor. The SetPoint 512 operates to maintain the slab or floor at the
minimum slab temperature setting.
Note:
Operating with only a slab or floor sensor can lead to either
overheating or underheating of the space.
Air and Slab or Floor Sensor Operation
When operating the air and slab or floor sensors concurrently, the
controller calculates an on time for the Heat 1 relay to satisfy the slab or
floor sensor’s requirements and on times for the Heat 1 and Heat 2 relays
to satisfy the air sensor’s requirements. The controller operates the Heat 1
relay for the longer of these two on times.
While the minimum slab or floor temperature is satisfied, the on times of
the Heat 1 and Heat 2 relays are calculated to satisfy the air temperature
requirements.
During heavy loads, the maximum slab or floor temperature setting limits
the on time of the Heat 1 relay. In this situation, the Heat 2 relay may be
on while the Heat 1 relay is off.
Note:
During light heating loads, overheating can occur due to the
minimum slab or floor temperature requirements.
Mode
Heat
In the Heat mode, the Heat 1 and Heat 2 relays satisfy the temperature
requirement of the zone.
Off
The Heat 1 and Heat 2 relays do 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 relays to operate and
keep the zone above 35°F (2°C).
12
Содержание SETPOINT 511S
Страница 16: ...Notes 26...