Ouellet OTR - Manual (Page 24)

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Q.16: Is the use of self-levelling cement mandatory when installing ceramic
tile?
A.16: If the room is small, an experienced tiler can do a good job without using
self-levelling cement, but this method is not recommended. The heating
cable must always be completely embedded in cement or an equivalent
binder (cement glue, ceramic glue, self-levelling cement). If the room is
medium-sized or large, the use of self-levelling cement is strongly recom-
mended to ensure the ceramic is perfectly level.
Q.17: Why choosing a Ouellet heating cable system (OTM or OTR) supplied
by a power source circuit of 240 Vac instead of a 120 Vac?
A.17: You can use both power sources circuit to heat a room, but it must comply
with the voltage assigned to the heating cables that are to be connected to
the chosen power source circuit.
Here in Canada, it is mainly a 240 Vac power source to which are connected
the electrical elements for heating a room. By cons, there are situations
where the only power source available is 120Vac (Ex: an old residence, an
inlet electrical box with only available 120Vac circuits breaker and in some
West states of the United States, where the only power source available is of
120 Vac).
Q.18: Can the thermostat be supplied by a 240 Vac power voltage line?
A.18: Yes, it can be supplied by both power voltages lines (120 Vac or 240 Vac).