Siemens NXAIR M - 24 Panel Heater; Heater Versions; Mechanical Temperature Controller

237 NXAIR M 139-2021.9 / 07
Panel heater
24 Panel heater
HINT
Read and understand these instructions before attempting operating works.
24.1 Heater versions
Optionally, one heater is installed each in the switching-device compartment and/or the connection
compartment. The panel heater is designed as high-load wire resistor in the following versions:
Types
Mounting location
High-load wire resistor [Ω]
Operational voltage [V AC]
Switching-device compartment
and/or connection compartment
125 (±10 %)
110
500 (±10 %)
230 to 240
Temperature control in the panel is done via a mechanical temperature controller or via an electronic
temperature and humidity controller.
24.2 Mechanical temperature controller
NOTICE
Damage due to incorrect application
The temperature controllers require direct connection to the ambient air.
Do not cover the ventilation slots of the temperature controllers.
The mechanical temperature controller can either be designed as a normally closed contact or as a normally
open contact.
Normally closed contact
Contact opens when temperature rises
Normally open contact
Contact closes when temperature rises
Fig. 394: Mechanical temperature controller
(1)
Selector for temperature
control
1