35
ELECTRIC HEATER, EHC
All electric air heaters must always be pre-regulated via flow in the supply air ducts.
This is done using a pressure switch (GP5) that measures the pressure in the supply
air duct in relation to atmospheric pressure. The pressure switch (GP5) is normally
connected, electrically, at delivery.
The hose is mounted as follows:
+ (plus) on GP5, will measure the supply air pressure in duct
- (minus) on GP5, must be unconnected, will measure atmospheric pressure
EXTERNAL ELECTRIC HEATER, NOT INTEGRATED IN HERU
®
CX
The electric heating coil is normally mounted inside the HERU
®
CX unit when
delivered from H. Östberg AB.
If the electric heating coil is a duct design, it is connected as follows:
GT9 is the designation
for
overheating
protection.
For activation/configuration:
Parameter name
Area
Select
Main index > Configuration > Configuration 1
Heating
No, Yes, …
No
Electric heating
No, Analogue, 1 stage, …
1 stage
Restart
√, Execute
Execute
Main index > Configuration > Configuration 2
Alarm electric heating
No, Yes
Yes
Restart
√, Execute
Execute
Pressure switch 30-300Pa with hose package ....................... Art.no 994020617
Pressure switch 30-300Pa with 5 m cable ............................ Art.no 995010010
9.13
9.14
External power
supply
43
44
1
2
45
L
N
PE
Electric
heater
GND
0-10V DC
ELB
3
4
46
47
GP5
Pressure
relay
NO (1)
COM (2)
230VAC
GT9
PE
L1
L2
L3
Control
230VAC
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