Viessmann VITOCROSSAL Installation Instructions Manual page 29

Connecting external cables
Adjusting the function of the circulation pump
Hydraulic connection/connection require-
ments
Single boiler system with:
Heating circuit without mixer
■
Connection without low loss header and with-
■
out heating water buffer cylinder
Single boiler system with heating circuits con-
nected to low loss header or heating water buf-
fer cylinder
Self-regulating pump
Pump is switched on and off via plug
L
N
?
C
sÖ
B
Fig. 34
Pump
A
To the control unit
B
Contactor
C
Separate power supply (observe manufacturer's
D
instructions)
(cont.)
.
sÖ
L N
D
?
A
Control unit setting
Coding address/group
Max. pump speed:
■
E6: ... /heating circuit
Min. pump speed:
■
E7: ... /heating circuit
For further details, see following
diagram and chapter "Heating
circuit ..." under code 2.
30:0/boiler/2
Circulation pump at plug
M
A
1~
L N
?
sA
Fig. 35
Circulation pump
A
Note
Connect DHW circulation pumps with standalone func-
tions directly to the 230 V ∼ supply.
Rated current
Rated voltage
Set function of connected component in coding
address "39"
Function
DHW circulation pump
Heating circuit pump for heating circuit
without mixer A1
Circulation pump for cylinder heating
(delivered condition)
Circulation pump setting
Ext. In
Ext. In
2 2
6 6
12 12
Ext. In
2 2
6 6
12 12
Recommended for t = 15 K
Δ
≙
49 kW: = 2 2.80 m
■
≙
■ 60 kW: = 3 3.44 m
sA
2(1) A~
230 V ~
Code
39:0
39:1
39:2
3 /h
3
/h
29