EH-105
Night cooling and reverse summer function can be taken into use whether or not cooling is in use.
Night ventilation: The outdoor sensor must be connected (channel meas. is not adaptable for this purpose)
Night ventilation decreases the need for mechanical cooling by ventilating rooms with fresh outdoor air. Night cooling
is not in use when
is set at 0. During night cooling the fresh air dampers are completely open, the HRU is at
minimum, the heat is turned off and the cooling unit does not run.
”
”
”
”
”
”
NightVentHys
NightVentHys
NightVentStop
Night ventilation starts up if:
1. No other start-up commands are in effect, e.g., clock control (see AH unit running p. 7-8)
2. The room temperature is at least 1.5°C above the room temperature setting.
3. The outdoor temperature is below the room temperature by at least the night ventilation hysteresis
4. The outdoor temperature is warmer than the night ventilation inhibiting limit
(e.g.,
= +12°C, see p. 25
(
)
Cooling with the HRU and/or damper reverse summer function:
The reverse summer function is taken into use in the operating mode menu of the control in question. With reverse
summer function, the HRU is driven to maximum output and the dampers to the minimum position of cooling when
half of the hysteresis between heating/cooling or at least 1°C is realized.
Mechanical cooling starts up if:
Operating mode
Not in use
Stepped
Contin.Control
Cooling can be realized with the HRU and damper reverse summer function, night
ventilation and mechanical cooling. On /Off type control (magnetic valves) or
continuous control (glycol cooling) can be used with mechanical cooling. The
cooling unit running permit can be obtained from strip connectors 42, 43 or 51
(activated in actuator selection, p. 41).
If you want to use night ventilation or mechanical night cooling, the outdoor
temperature sensor must be installed outside (not in a fresh air channel) and the
room temperature sensor inside (not in an exhaust air channel).
The cooling step
can also start up when the outdoor sensor is not connected.
Not in use:
Stepped:
Mechanical cooling is not in use.
Cooling blocks can be used in cooling. Each block is controlled by On/Off type
magnetic valves. The magnetic valves are driven by 0…10VDC control (strip connector
64), by EHR voltage controlled relays or by EH-686.
1. the room temperature is higher than the room temperature set value set in the user level by at least the hysteresis
between heating and cooling (”Heat/cool Hys”). (this requirement does not pertain to supply temperature
controlled AH units).
2. the outdoor temperature is not below the set value that inhibits cooling (outd.inhibit) and
3. the cooling output is zero.
Mechanical night cooling starts up
if the room temperature rises above the ”Night cool.” setting. The room is
cooled during the night to the ”Night cool.” setting - 2°C. Night cooling is not in use at a setting of 0°C. The night
cooling function is limited if mechanical cooling is blocked.
COOLING:
Operating mode
Select
Mainten.mode
Cooling
Cooling
Operation mode
Settings
Tuning values
Actuator
38
Contin.Control:
During continuous cooling the controller drives the cooling circuit's
valve actuator by means of a 0…10VDC control output (strip connector 64).
Instr.
p.23
