Gravity Operation:
Although the BOOST mode operates in a similar way when the controller is configured for gravity
operation, the central heating cannot be operated without the hot water. The override duration for
hot water MUST be equal to or longer than the setting for central heating.
When configured for gravity operation,
increasing the central heating override
setting will automatically increase
the hot water setting.
After changing the BOOST settings and confirming
with the OK key, the display will change to indicate
the controller status.
If central heating has no BOOST setting,
but the hot water has, the display will
alternate like this:
11SP120 INSTRUCTION MANUAL
SP220 Manual Ver 005.qxd:Layout 1 5/1/11 10:54 Page 11
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