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The X-OUTPUT relay is volt free as shown in fig 6a. If the relay is required to be used as an L & N switch, link the
mains L terminal to the C1 terminal, then connect the L terminal of the device to the C2 terminal and the N terminal
of the device to the mains N terminal.
Boiler pump
Where a primary boiler pump is to be switched on by the master, the relay output can be used for this purpose. The
relay will be activated 10 seconds after the UFH circulating pump has started.
High-limit zone valve
This function is used where additional protection is required to prevent boiler water from entering the underfloor
system when the system is OFF or when the supply water temperature exceeds 65°C.
An additional sensor (ETF-522), referred to as ‘Application Sensor’ in fig. 6d, is required and a zone valve must be
connected via the X-OUTPUT (see example in fig. 6c).
Cooling device/module
The relay output can be used to provide a volt-free signal to a heat pump or to a K-MOD switching module where a
chiller is utilized to provide cooling water. The relay is ON when there is a cooling demand. (For further information,
see “Using cooling functions”.)
Cooling device/module, alternative:
The relay output is always ON in cooling mode and OFF in heating mode. (For further information, see “Using
cooling functions”.)
Differential thermostat
The relay output can be used to enable use an alternative energy source, e.g. solar energy. In this case, the supply
water sensor must be supplemented with an additional sensor (ETF-522), referred to as ‘Application Sensor’,
which is used to monitor the temperature in the water storage cylinder of the alternative energy source. If the
system detects (via the Application Sensor) that this temperature is more than 3°C higher than the supply water
temperature, it activates the X-relay to select the alternative energy source via a valve and/or pump.
installation
BR1025A10a
© 2015 OJ Electronic
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10
-G
B
ON
OFF
Common UHF-PUMP
Commission mode
X-RELAY
Learn mode
Boiler test
Install mode
WLM2 Compatible
ON / OFF Control
Fig. 6b
BR1025A10a
Fig. 6c
BR965A40a
BR1025A19a
© 2015 OJ Electronic
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WLM3-BA/FS
MASTER
-G
B
BOILER
MANIFOLD
MANIFOLD
Supply water sensor
(if fitted)
Application Sensor
(High limit sensor)
High limit
zone valve
Bypass
Fig. 6d
BR1025A19a
Summary of Contents for WLM3
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