PM-LUFT GOLD 2 - Page 14

14
GOLD 1-3 SK-GB-708
Right to make modifications without prior notice
0
5
10
0
-4
-2
+2
+4
+5
Set value displacement °C
Control signal V DC
::::
COOLING UNIT 0
DUCT CALIBR 0
SERV PERIOD 12 MONTHS
RET PROG
➜
➜
8.4 Set value displacement
At SET VALUE DISPL = 1 (on). The temperature set value
can be displaced +/- 5°C with the help of 0–10 VDC
external control.
The set value displaced is the EA/SA-differance at ERS-
regulation, the supply air temperature at supply air
regulation and the exhaust air temperature at exhaust air
regulation.
When activating the function the set value is displaced
according to diagram to the right. 0 VDC gives a decrease
of the temperature set value of 5°C, 5VDC gives
unchanged set value and 10 VDC gives an increase of
5°C. Upon ERS regulation, the EA/SA difference decrea-
ses when there is an increased control signal. EA/SA-
DIFF cannot be less than 1° C.
The external control signal is connected on the
connection box 7–8 (-)(+) of the control card.
8.5 Cooling unit
8.5.1 Cooling on/off
At COOLING UNIT = 1 (on).
When need of cooling occurs a closure of free making
contact is obtained (connection box 17–18). This closure
can be used to start an external cooling unit.
When the need of cooling stops the contact opens and a
restart time of 10 minutes starts running. This is to
prevent too many start/stops of the cooling unit
A neutral zone of 2°C is programmed so that set value at
cooling is 2°C higher than set value.
Conditions for activation of cooling function.
Exhaust Air regulation:
- Exhaust air temperature rises above the set value
including the neutral zone.
- Supply air temperature is above the set value on
SA-MIN.
ERS Regulation, Step 3:
- Supply air temperature rises above the set value
according to the set curve including the neutral
zone.
Conditions for interrupting the cooling function:
Exhaust Air regulation:
- Exhaust air temperature has gone down to 0.5
degrees above the set value.
- Supply air temperature is below the set value on
SA-MIN.
ERS Regulation, Step 3:
- Supply air temperature has gone done to 0.5
degrees above the set value according to the set
curve.
The function is not applicable upon Supply Air
regulation and ERS Regulation, Steps 1 and 2.