Fig 6
These actuators are fitted to the underfloor heating manifolds and control the supply of water through the
various loops. The voltage of the thermal actuators, 230V or 24V, must correspond to the master.
Master type WLM-1BA and WLM-1FS are for 230 V thermal actuators, and master type WLM-3BA
and WLM-3FS are for 24V Thermal actuators. Up to 8 different zones can be controlled by the master.
Connect the thermal actuators on the loop(s) for each zone to the corresponding terminals on the master.
Thermal actuators belonging to zone 1 must be connected to output terminal 1, and thermal actuators for
zone 2 must be connected to output terminal 2, etc, etc.
Guideline
More than 1 head can be connected to a single terminal, provided that the heads are to be controlled by
the same room Room sensors.
Connect the Brown wire to the L terminal, and the Blue wire to the N terminal. When the installation is
complete, check that the Room sensor in e.g. room(zone) 1, operates the correct thermo actuator(s) for
that room on the manifold. If the heads appear to be in the wrong position on the manifold, it may be
simpler to change them on the manifold, rather than reconnecting them on the master.
Thermal Actuators [Thermoheads]
p. 17
The X relay output is volt free as shown in fig 8a. If the relay is required to be used as a L & N switch,
connect a link wire from mains L to C1, connect the device L to C2, and the device N to mains N.
Boiler pump:
Where a boiler primary pump is required to be switched on from 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 an additional protection is required to prevent boiler water entering the
underfloor system, when the system is off or when the supply water exceeds 65 C.
An additional sensor (ETF-1899A) and a zone valve is connected as per attached pic.
Cooling device/module:
The relay output can be used to provide a volt free signal to a heatpump, or to a K-MOD switching
module where a chiller is utilized to provide the cooling water. The relay is on when there is a cooling
demand.
Cooling device/module alternative:
The relay output is always on in cooling mode and off in heating mode.
WLM underfloor heating contr
oller
