28
• Connection diagrams
3110086 EHC20 UK 110515
O.2
Program 6.1.2. Heat exchanger without bypass damper. With two storage tanks.
Smoke gas temperature
Storage tank
temperature
1
temperature
2
Storage tank
1
1
1
1
1
2
2
2
2
2
3
3
3
4
4
4
5
C
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
L
N
N
N
N
N
N
N
NC
NO
PE
PE
PE
PE
PE
PE
PE
PE
R1
R2
R3
R4
R5
R6
S1
S2
S3
S4
S5
S6
S7
S8
V1
V2
1
1
1
1
1
2
2
2
2
2
3
3
3
4
4
4
5
C
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
L
N
N
N
N
N
N
N
NC
NO
PE
PE
PE
PE
PE
PE
PE
PE
R1
R2
R3
R4
R5
R6
S1
S2
S3
S4
S5
S6
S7
S8
V1
V2
0-
10
V
G
ND
/0
V
L
N
PE
0-
10
V
G
ND
/0
V
L
N
PE
U
-S1
U
-S3
U
-S8
L1
N
P
E
L
N
PE
L
N
PE
U
-S2
Temperature sensor input
8
V
FS
2
sensors
V
FS
1
sensors
Mains
0-
10
V
output
0-
10
V
output
exodraft EHC10/EHC20 controller
P
F relay
Relay output
6
Relay output
1
RC
plugs
C
A
N
C
A
N
Temperature sensor input
7
Temperature sensor input
6
Temperature sensor input
5
Temperature sensor input
4
Temperature sensor input
3
Temperature sensor input
2
Temperature sensor input
1
Relay output
5
Relay output
4
Relay output
3
Relay output
2
Pump
3-way valve
temperature
Forward flow
This diagram shows the following system:
Heat exchanger
without
bypass damper. Two storage tanks, a 3-way valve and a 0-10 V regulated circulator pump.
The S8 temperature sensor must be positioned in the heat exchanger inlet.
The S3 temperature sensor must be mounted on the forward flow pipe immediately after the heat exchanger.
The S2 temperature sensor must be mounted in storage tank #2.
The S1 temperature sensor must be mounted in storage tank #1.
Important:
An STL thermostat which turns off the burner must be mounted on the forward flow pipe. The forward flow
temperature must not exceed 100°C.
