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COMPACT
COMPACT Control System
COMPACT Control System
ERS Regulation (control)
ERS Regulation refers to Extract air temperature-Related
Supply air temperature control. This means that the tem-
perature of the supply air is regulated in relation to the
temperature of the extract air.
Under normal circumstances, the supply air temperature is
regulated to be a few degrees lower than the extract air
temperature. In this way, the heat exchanger will provide
optimal performance, and this means excellent operat-
ing economy. ERS control is suitable for use when there
is excess heat in the premises generated, for example,
by machinery, lighting or people and the premises have
supply air devices suitable for discharging air below room
temperature.
ERS Regulation is standard in the COMPACT Air and
COMPACT Heat systems.
Control Sequence
The temperature efficiency of the air handling unit’s heat
exchanger is modulated to provide max. heat recovery.
After that, the air heater for reheating, if installed, will
begin to generate heat.
If an air heater for reheating the supply air is not installed,
or if the heating power in the air heater for reheating is
not sufficient, the supply air fan or both the supply air
and the exhaust air fans will automatically and variably
be decelerated to discharge supply air at the min. airflow
setpoint.
A neutral zone can be preset, which allows a lower supply
air temperature setpoint before the downspeed fan con-
trol (fan deceleration) function begins.
When the supply airflow is regulated to a lower rate, the
heat exchanger will have ”excess heat”, i.e. warm extract
air, giving it capacity to attain and maintain the supply air
temperature required. As the supply airflow is controlled
to a lower rate, the air pressure in the premises becomes
sub-atmospheric and this instead causes outdoor air to be
sucked in through untight spots (leakage points) such as
doors and windows. The ordinary heating system of the
premises must be sized for heating this outdoor air.
ERS Regulation 1
The control unit regulates the ratio between the supply air
and extract air temperature according to a factory-preset
curve.
1) Breakpoint in °C
(based on the extract air temperature).
2) The temperature differential above the breakpoint is
selected in steps.
3) The temperature differential below the breakpoint is
selected in °C.
See the diagram: ERS Regulation 1, to the right for COM-
PACT Air & Heat and COMPACT Unit & Top respectively.
16
18
22
26
12
18 20
14 16
22 24
20
Extract air temperature °C
Supply air temp. setpoint °C
ERS Regulation 1, COMPACT Air & Heat
Step 1
Breakpoint
SA/EA differential
Step 3
Step 2
Temperature regulation
Extract air temperature °C
Supply air temp. set point °C
Factory setting: Step 1. Breakpoint: 20°C. SA/EA differential: 2°C.
Involves the following: If the extract air temperature is below 20°C
(breakpoint), the supply air temperature setpoint will be automatically
regulated to be 2°C (EA/SA differential) lower.
If the extract air temperature is above 20°C, the supply air temperature
setpoint will follow the curve according to Step 1.
20
10
12 14 20 16 18 21 22 24
12
14
16
18
26
Step 1
Step 2
Breakpoint
SA/EA differential
Step 3
Step 4
ERS Regulation 1, COMPACT Unit & Top
Factory setting: Step 1. Breakpoint: 20°C. SA/EA differential: 2°C.
Involves the following: If the extract air temperature is below 20°C
(breakpoint), the supply air temperature setpoint will be automatically
regulated to be 2°C (EA/SA differential) lower.
If the extract air temperature is above 20°C, the supply air temperature
setpoint will follow the curve according to Step 1.
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