SYX66x Commissioning Guide
V1.10.3 300117
Page 16 of 61
4.5 Connection Diagram: Y PLAN Mode
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One Space Sensor is required for the optimiser to function. The second is optional.
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The HWS is enabled from 11 & 12
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The boilers link option must be selected and the Aux input set to HWS Demand
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Time Extend and Holiday features apply
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1, 2 boilers or 0-10v outputs can be used for boilers
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HWS Thermostat is Volt Free Contact
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Room Sensor is correct sensor type only. Do not connect a room thermostat.
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VT Valve Control not supported
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Plant Start Connection is optimised on and optimised off as default. The HTG connection remains closed through the
occupied period unless space limit reached. Optimum Off can be disabled meaning plant then turns off at end of
occupied period on space High Temperature.
•
Outside Air Sensor can be fitted to provide Compensated Flow from Boilers and Outside High Temp Shutdown if
required.
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Outside sensor will display as 0°C if not connected.
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If boiler compensation control is required then a boiler flow sensor is required
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If plant room is exposed and return frost is required please connect a return sensor
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Observe KP10 sensor type polarity and GND connection see note Page 6
SYX 66x
1 2
3 4
5 6
7 8
9 10
11 12
13 14 15 16 17 18
12vDC 0v
Space 1
Space 2
L
N
Pump
27 28 29 30 31 32 33 34 35 36
HTG
HWS
Boiler 1
Boiler 2
HWS Stat
-ve
-ve
