© 2015 OJ Electronics A/S
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supply water sensor
This feature, which limits supply water temperature, is available on full system masters, WLM3-xFS.
The supply water sensor should be connected directly to the master via the terminals marked Supply
Sensor. A temperature sensor of type ETF-522 must be used.
The sensor should be placed on the supply water pipe to the underfloor heating system. If a sensor is
installed in a system without a weather compensation module (WLOC3), the master will maintain the
design supply water temperature. The factory default setting can be changed via the display.
If a weather compensation module (WLOC3) is added to the system, the master will vary the supply
water temperature setting according to the outdoor temperature. A standard factory-programmed
compensation curve is used for this purpose. If needed, the curve can be changed, see separate USER
MANUAL, MASTER TYPE WLM3.
Mixing valve actuator control
A mixing valve actuator can be controlled by digital WLM3-xFS masters.
The actuator must be 24V AC powered (max. 6VA) and positioned via a 0-10V DC signal. It should be
configured so that it closes the valve if there is no heating demand (0V DC signal). If required, the control
signal can be reversed to 10-0V via the master's menu system.
Control action of the mixing valve actuator is P + I, and the parameters can be changed if required in the
master's menu system.
Please contact your supplier for further instructions.
installation
supply water sensor and mixing valve
Fig. 12b
BR965A39a
Fig. 12a
BR965A19b
Summary of Contents for WLM3
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