MHS Boilers STRATA 3 220, Instructions For Installation, Servicing & Operation

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17
STRATA3
24
68
1
0
13
57
9
12
S1
LN
N
LE
N
LE
ES
4
S5
S6
D5D2D1
14
16
18
20
22
24
26
28
30
32
34
36
38
23
25
27
29
31
33
35
37
11
13
15
17
19
21
RS232
R2
R3
R2
R3
R2
R3
R2
R3
R2
R3
Fig 5.7g
5.7.8 domestic hot water temperature sensor (TF)
(if required)
For domestic hot water priority, a KTY 81-210 sensor or a volt free contact thermostat can be used.
Connections are provided at connector No 5 – see fig 5.7b.
5.7.9 LPG operation
For use with LPG, an external gas solenoid valve (if required) may be installed in the gas supply line
outside the building. This interrupts the gas distribution if there is no heat demand or a fault. Connections
for an external solenoid (if required) are provided at plug No 2 – see fig 5.7b.
5.7.10 connecting the DHW primary pump
(if required)
A domestic hot water primary pump can be connected directly to the boiler. The connection should
be made via a 3 core cable to plug No 6 – see fig 5.7b. Max load 2A. Where the pump motor exceeds
2Amps a proprietry relay must be used.
5.7.7 cascade controller KKM2 (contd)
HWS Primary Pump 230V ac
Heating Pump 230V ac
230Vac Supply
Flow Sensor
Return Sensor
HWS Sensor
Outside Air Sensor
RE 2132 Room Unit
or
External On/Off Controls
Boiler Control Connections
For Strata 3 Control
Connect to Plug 4 R2 & R3
KKM2 sequence controller wiring details
Further information can be found in the operating manual of the KKM cascade manager.
B1
B2
B3
B4
B5