Xylem EHR IM Electrical heater series EHR (obsolete) - Manual (Page 4)

The integrated constant temperature control uses a solid state
relay and therefore operates absolutely noiselessly. It has a
range from 68°F to 158°F and is integrated in the top wiring
compartment.
The safety temperature cut out will disconnect the electrical
phase in case of overheating. It is set to 200°F +/- 5° and can
not be changed. Its purpose is to protect the unit from
overheating and not to protect a floor heating or wall heating
system attached to the unit. If necessary or required, an
additional strap-on thermostat can be used and wired in series
with the main power supply (Laing AT)
If the safety temperature limiter has tripped, it needs to be
reset manually.
ON-Off-Switch
1/2” return side
connection
1/2” feed side connection
Safety temperature
cut out
Feed
temperature
setting
EHR
Indication LEDs
4