Exodraft EHC20, Mounting, Installation And Operating Manual

Page: 38 / 72

38 • Connection diagrams
3110086 EHC20 UK 110515
O.7 Program 6.1.7. Heat exchanger with bypass damper. With one storage tank and a mixer.
Blue Black Brown
Smoke gas temperature Forward flow
temperature
Storage tank
temperature
CCW CW N CCW CW N
L N
PE
L N
PE
L N
PE
L N
PE
U
-S1
U
-S3
U
-S8
L1
N
P
E
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
Mixer Bypass Pump
Temperature sensor input
8
V
FS
2
sensors
V
FS
1
sensors
M
ai
ns
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
This diagram shows the following system:
Heat exchanger with bypass damper. One storage tank, a mixer and a 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 S1 temperature sensor must be mounted in storage tank #1.
The mixer should be controlled in such a way that R4 is enabled when the temperature in the forward flow pipe needs
to increase. R5 is enabled when the temperature needs to decrease.
R6 is enabled when the bypass damper is to switch to the non-bypass position.
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.