Page 37
In TERRA CL models 22-33kW, a contactor for an electric
heating immerser can be controlled by the heat pump
supply via terminal 3. The heating immerser then ac-
tivates either automatic / manual or off via the switch S2
(black). The buffer loading pump runs in parallel with the
electric heating immerser even if the compressor is not
running.
L
N
PE
L ... S
ensor / Bus +
L ... GND / S
ensor / Bus -
Actuators – Pumps / valves
Actuators are connected to 3-layer series terminals. The-
se are generally configured as follows:
Mixer connection:
(applies to NEHS mixers).
Mixer open
=
brown
Mixer closed =
black
Maximum restriction for underfloor heating:
With underfloor heating circuits, an additional clip-on
thermostat must be fitted and the relevant heating circuit
pump supply switched via it in series.
If speed-controlled
pumps are being
used (such as
Grundfos Alpha), they
must be switched via a contactor
on all poles, in other words
phase conductor and neutral
conductor (see diagram and
Grundfos manual).
An auxiliary relay must be integrated
for the electrical connection of a prio-
rity valve with actuation on both sides.
The connection should be made on
the right according to the connection
diagram or installation instructions with
a three-way switching valve.
The neutral conductor and earthing
should also be laid on the three-layer
terminals.
1
L1
X1
2
L2
3
L3
5
PE
4
N
6
L1
7
L2
8
L3
9
PE
10
L1
11
L2
12
L3
13
N
14
PE
15
L1
16
L2
17
L3
18
N
19
PE
20
L1
21
L2
22
L3
23
N
24
PE
X1
1
L
X1
3
PE
2
N
4
L
6
N
7
PE
8
L
9
N
10
PE
14
L1
15
L1
5
L
11
L
12
N
13
PE
16
L1
17
N
18
PE
X5
1
2
3
4
5
6
7
8
1
X2
2
3
4
5
6
PE
N
L
N
L
E1
PE
N
L
N
L
L N
L N
55
56
N
L
N
X3
55
56
57
58
59
60
61
62
63
64
65
66
X4
81
82
83
84
85
86
87
88
89
90
91
1
L1
X1
2
L2
3
L3
5
PE
4
N
N
L
8
X5
3x400V / 50Hz
main current
EW / WVU
- idle
periode block
air inlet sensor
PTC RFT 1
14A40
defrost sensor
PTC RFT 204B30
condenser sensor
PTC RFT 204B30
LP
- pressostat
HP
-pressostat
starting current limiter
fault output
fan
EW / WVU - Idle periode block
close
open
room station/ remote control
RSS-T / RFF-T
AF external sensor
RLF
, PF
, WF
return- / buffer- or heating generator
SF service water sensor (buffer sensor)
VF1 flow sensor HC1
VE1 varible input 1
KVLF solar kollector sensor
VF2 flow sensor HV2
VE2 varible input 2
VE3 varible input 3
KSPF solar buffer sensor
relais
for speed control- led pumps
boiler loading pump/ priority valve
pump for heating circle without mixer
buffer loading pump
mixer HC1 open
brown
mixer HC1 close
black
pump HC1
mixer HC2 open
brown
mixer HC2 close
black
pump HC2
control 2. heating generator
variable output 2
programmable e.g. solarpump
phase 230V/ 50Hz
230V / 50Hz control current
electric heating immenser
4-way valve
(heatpump internal)
companion heating
for condens run-off
connection for
compressor heating
1x230V / 50Hz
primary current
compressor
radial
fan
primary current
heating immenser
connection
heating immenser
3x400V / 50Hz
primary current
compressor
radial fan
3x400V / 50Hz
primary current
heating immenser
3x400V / 50Hz
electric
heating immenser
1
L1
X1
2
L2
3
L3
5
PE
4
N
6
L1
7
L2
8
L3
9
PE
10
L1
11
L2
12
L3
13
N
14
PE
15
L1
16
L2
17
L3
18
N
19
PE
20
L1
21
L2
22
L3
23
N
24
PE
X1
1
L
X1
3
PE
2
N
4
L
6
N
7
PE
8
L
9
N
10
PE
14
L1
15
L1
5
L
11
L
12
N
13
PE
16
L1
17
N
18
PE
X5
1
2
3
4
5
6
7
8
1
X2
2
3
4
5
6
PE
N
L
N
L
E1
PE
N
L
N
L
L N
L N
55
56
N
L
N
X3
55
56
57
58
59
60
61
62
63
64
65
66
X4
81
82
83
84
85
86
87
88
89
90
91
1
L1
X1
2
L2
3
L3
5
PE
4
N
N
L
8
X5
3x400V / 50Hz
main current
EW / WVU
- idle
periode block
air inlet sensor
PTC RFT 1
14A40
defrost sensor
PTC RFT 204B30
condenser sensor
PTC RFT 204B30
LP
- pressostat
HP
-pressostat
starting current limiter
fault output
fan
EW / WVU - Idle periode block
close
open
room station/ remote control
RSS-T / RFF-T
AF external sensor
RLF
, PF
, WF
return- / buffer- or heating generator
SF service water sensor (buffer sensor)
VF1 flow sensor HC1
VE1 varible input 1
KVLF solar kollector sensor
VF2 flow sensor HV2
VE2 varible input 2
VE3 varible input 3
KSPF solar buffer sensor
relais
for speed control- led pumps
boiler loading pump/ priority valve
pump for heating circle without mixer
buffer loading pump
mixer HC1 open
brown
mixer HC1 close
black
pump HC1
mixer HC2 open
brown
mixer HC2 close
black
pump HC2
control 2. heating generator
variable output 2
programmable e.g. solarpump
phase 230V/ 50Hz
230V / 50Hz control current
electric heating immenser
4-way valve
(heatpump internal)
companion heating
for condens run-off
connection for
compressor heating
1x230V / 50Hz
primary current
compressor
radial
fan
primary current
heating immenser
connection
heating immenser
3x400V / 50Hz
primary current
compressor
radial fan
3x400V / 50Hz
primary current
heating immenser
3x400V / 50Hz
electric
heating immenser
1
L1
X1
2
L2
3
L3
5
PE
4
N
6
L1
7
L2
8
L3
9
PE
10
L1
11
L2
12
L3
13
N
14
PE
15
L1
16
L2
17
L3
18
N
19
PE
20
L1
21
L2
22
L3
23
N
24
PE
X1
1
L
X1
3
PE
2
N
4
L
6
N
7
PE
8
L
9
N
10
PE
14
L1
15
L1
5
L
11
L
12
N
13
PE
16
L1
17
N
18
PE
X5
1
2
3
4
5
6
7
8
1
X2
2
3
4
5
6
PE
N
L
N
L
E1
PE
N
L
N
L
L N
L N
55
56
N
L
N
X3
55
56
57
58
59
60
61
62
63
64
65
66
X4
81
82
83
84
85
86
87
88
89
90
91
1
L1
X1
2
L2
3
L3
5
PE
4
N
N
L
8
X5
3x400V / 50Hz
main current
EW / WVU
- idle
periode block
air inlet sensor
PTC RFT 1
14A40
defrost sensor
PTC RFT 204B30
condenser sensor
PTC RFT 204B30
LP
- pressostat
HP
-pressostat
starting current limiter
fault output
fan
EW / WVU - Idle periode block
close
open
room station/ remote control
RSS-T / RFF-T
AF external sensor
RLF
, PF
, WF
return- / buffer- or heating generator
SF service water sensor (buffer sensor)
VF1 flow sensor HC1
VE1 varible input 1
KVLF solar kollector sensor
VF2 flow sensor HV2
VE2 varible input 2
VE3 varible input 3
KSPF solar buffer sensor
relais
for speed control- led pumps
boiler loading pump/ priority valve
pump for heating circle without mixer
buffer loading pump
mixer HC1 open
brown
mixer HC1 close
black
pump HC1
mixer HC2 open
brown
mixer HC2 close
black
pump HC2
control 2. heating generator
variable output 2
programmable e.g. solarpump
phase 230V/ 50Hz
230V / 50Hz control current
electric heating immenser
4-way valve
(heatpump internal)
companion heating
for condens run-off
connection for
compressor heating
1x230V / 50Hz
primary current
compressor
radial
fan
primary current
heating immenser
connection
heating immenser
3x400V / 50Hz
primary current
compressor
radial fan
3x400V / 50Hz
primary current
heating immenser
3x400V / 50Hz
electric
heating immenser
1
L1
X1
2
L2
3
L3
5
PE
4
N
6
L1
7
L2
8
L3
9
PE
10
L1
11
L2
12
L3
13
N
14
PE
15
L1
16
L2
17
L3
18
N
19
PE
20
L1
21
L2
22
L3
23
N
24
PE
X1
1
L
X1
3
PE
2
N
4
L
6
N
7
PE
8
L
9
N
10
PE
14
L1
15
L1
5
L
11
L
12
N
13
PE
16
L1
17
N
18
PE
X5
1
2
3
4
5
6
7
8
1
X2
2
3
4
5
6
PE
N
L
N
L
E1
PE
N
L
N
L
L N
L N
55
56
N
L
N
X3
55
56
57
58
59
60
61
62
63
64
65
66
X4
81
82
83
84
85
86
87
88
89
90
91
1
L1
X1
2
L2
3
L3
5
PE
4
N
N
L
8
X5
3x400V / 50Hz
main current
EW / WVU
- idle
periode block
air inlet sensor
PTC RFT 1
14A40
defrost sensor
PTC RFT 204B30
condenser sensor
PTC RFT 204B30
LP
- pressostat
HP
-pressostat
starting current limiter
fault output
fan
EW / WVU - Idle periode block
close
open
room station/ remote control
RSS-T / RFF-T
AF external sensor
RLF
, PF
, WF
return- / buffer- or heating generator
SF service water sensor (buffer sensor)
VF1 flow sensor HC1
VE1 varible input 1
KVLF solar kollector sensor
VF2 flow sensor HV2
VE2 varible input 2
VE3 varible input 3
KSPF solar buffer sensor
relais
for speed control- led pumps
boiler loading pump/ priority valve
pump for heating circle without mixer
buffer loading pump
mixer HC1 open
brown
mixer HC1 close
black
pump HC1
mixer HC2 open
brown
mixer HC2 close
black
pump HC2
control 2. heating generator
variable output 2
programmable e.g. solarpump
phase 230V/ 50Hz
230V / 50Hz control current
electric heating immenser
4-way valve
(heatpump internal)
companion heating
for condens run-off
connection for
compressor heating
1x230V / 50Hz
primary current
compressor
radial
fan
primary current
heating immenser
connection
heating immenser
3x400V / 50Hz
primary current
compressor
radial fan
3x400V / 50Hz
primary current
heating immenser
3x400V / 50Hz
electric
heating immenser
Before commissioning the system, check
that the pumps are correctly in position.
Before commissioning the system, tighten
the terminals.
Control current power supply
