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Section 3. ELECTRICAL CONNECTIONS -
continued
CONNECTING THE UNIT TO A BMS
Please refer to the Innovair Engineering Guide for details on how the unit can be
connected to a BMS network.
CONNECTING THE UNIT TO A TIMER CLOCK OR P.I.R. Sensor
Unless using a BMS (or other supervisory system) to enable the unit, the unit is
controlled by linking across the Timer terminals on the main terminal strip in the
unit where linked = 'on/occupied'.
Connections should be made on site to either a PIR, low water temperature stat
(used in conjunction with a Summer/Winter switch) or other volt free contacts.
When connecting a low water stat, follow the below instructions. You should
include a summer/winter switch in the design to allow the unit to operate in
Summer when there is no hot water available.
Using the typically supplied Siemens RAM1 – connect terminals 1 and 3 to
the Timer connections (note polarity doesn't matter).
Connect the summer/winter switch in parallel across the T4. It is
recommended that in public spaces, this switch is located discretely so it
isn't tampered with.
Fix the RAM1 to the supply side of the pipework - not the unit side.
Tidy all wiring up
When connecting a PIR sensor:
Please refer to the PIR sensor manufacturer's documentation – the
contacts MUST be volt free.
Page 19
v2.1
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