robatherm RM - Heating, Cooling, and Electric Heater; Coil Protection and Operation

Heating coil, cooling coil, and electric heater
66 © robatherm
Heating coil, cooling coil, and electric
heater
Heating coil
To prevent the heating coil from freezing: Add frost protection agent or install air or water/condensate
side frost protection monitoring depending on system design.
Steam heater
NOTE
Heat damage to the AHU due to steam heater
Overheating of the steam heater causes heat damage to the AHU.
• Operate the steam heater only when the fan is running.
• Provide airflow monitoring or temperature limiters.
In the case of hydraulic sets for steam heaters, the unobstructed drainage of condensate must also be
checked (all condensate shut-off valves must be open).
Cooling coil
To prevent the cooling coil from freezing: Add frost protection agent or consider installing a preheater
on the air inlet side of the cooling coil.
For HE-RAC with dehumidification with run around coil: Preheating the air in the HE-RAC coil does not
ensure sufficient frost protection. The cooling coil must be protected from freezing with a frost
protection agent.