Assortment / System Description

Fan
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Powered Box
Electric reheater
19
A6V10866237_en--_b_08 163 | 275
19.18 Electric reheater
Electric heating coils, controlled via an analog output on the DXR2, can receive
an enable via a relay or Triac on the DXR2.
A binary overtemperature (open contact) protection can be connected on the
DXR2 for all versions of the electric reheater application. The application
switches off the electric reheater at device protection priority if
overtemperature protection is enabled.
Description Name Default value
Enable overtemperature input
0:No
1:Yes
EnOvrTDetIn 0:No
WARNING
Electric heat coils require safety limit thermostat
Improper installation of electric heating coils can result in fire and cause
destruction of life and property.
● Install a high temperature cut-out switch on all electric heating elements.
● Ensure that all wiring and installation conform to applicable safety codes
and regulations.
19.19 Night cooling
The plant operating mode cools a room using cooling outside air. The central
function sends a "Night cooling request" to the group member rooms. The
decision as to whether night cooling makes sense and is energy efficient is
made at the central function. Various coordination signals between the primary
plant and room automation do the following via central functions:
● Switch on the fans,
● Set the mixed air dampers to 100% outside air,
● Lock all other equipment including heating coils, cooling coils, humidifier.
Night cooling only occurs under the following conditions:
● The room is vacant (Economy or Protection).
● The outside temperature is above an adjustable setpoint of 9 °C.
● The temperature difference to cooling is sufficiently large, i.e. room
temperature - outside temperature > 7 K.
● The temperature deviation from room temperature and temperature
setpoint is sufficiently large, i.e. room temperature > room setpoint + 2 K.
Description Name Default value
Night cooling
0: Inactive
1: Active
NgtCReq 0: Inactive
Safety thermostat