User Manual

47
AUTOMATIC CONTROL
3 COOLING CONTROL BT Reason for energy savings
3.5 Intermittent control of emission and /or distribution
One controller can control different rooms/zones
having same occupancy patterns
0
No automatic control
No savings, since emission and/or distribution
are permanently in operation.
1
Automatic control with fixed time program
To lower the operation time
Savings in emission and/or distribution outside
the nominal operating hours.
2
Automatic control with optimum start/stop
To lower the operation time
Additional savings in emission and/or distribution
by continuously optimizing the plant operating
hours to the occupancy times.
3
Automatic control with demand evaluation
To lower the operation time
The operating time for emission and/or
distribution is determined based on consumer
demand. This can be accomplished via the
operating mode (Comfort, PreComfort,
Economy, Protection).
3.6 Interlock between heating and cooling control of
emission and/or distribution
9
To avoid at the same time heating and cooling in
the same room depends on the system
principle(e.g. cooling panel/heat emitter,
TABS/ventilation, several indoor units)
0
No interlock:
the two systems are controlled independently
and can provide simultaneously heating and
cooling
Simultaneous heating and cooling possible. The
energy provided in addition is wasted.
1
Partial interlock (dependent of the HVAC system)
The control function is set up in order to minimize
the possibility of simultaneous heating and
cooling. This is generally done by defining a
sliding set point for the supply temperature of
the centrally controlled system.
Generation/distribution in HVAC system:
The outside temperature-dependent generation
setpoints for heating and cooling can prevent –
to some extent – that room temperature
controllers used in connection with terminal units
reheat in the summer or recool in the winter.
The more apart the setpoints of all individual
room controllers for heating and cooling (large
neutral zones), the more efficiently provisioning
can be locked.
2
Total interlock
The control function enables to warranty that
there will be no simultaneous heating and
cooling.
Emission in the room:
A complete lock (e.g. a room temperature
sequence controller) prevents any energy
absorption in the individual room.
Generation/distribution in HVAC system:
The demand-dependent setpoints for heating
and cooling from the rooms can prevent that the
room temperature controllers used in connection
with terminal units reheat in the summer or
recool in the winter.
The more apart the setpoints of all individual
room controllers for heating and cooling (large
neutral zones), the more efficiently provisioning
can be locked.