3
QM 1336.rev.01
We strongly recommend installing supplementary natural
ventilation, a failure alarm system as well as a back-up ther-
mostat on at least one cooling stage (refer to the wiring diagram
enclosed with this user's manual to connect the thermostat).
Although fuses on the outputs of the controller protect its
circuits in case of an overload or overvoltage, we recommend
installing an additional protection device on the supply circuit
as well as an external relay on all ON-OFF stages to prolong
the life of the controller.
The room temperature where the controller is located MUST
ALWAYS REMAIN BETWEEN 32°F AND 104°F (0°C TO 40°C).
To avoid exposing the controller to harmful gases or exces-
sive humidity, it is preferable to install it in a corridor.
DO NOT SPRAY WATER ON THE CONTROLLER
PRECAUTIONS
FOR CUSTOMER USE
Enter below the serial number located on
the side of the controller and retain this
information for future reference.
Model number:
____ST 5220__
Serial number:
_____________
Date installed:
_____________
