Assortment / System Description

Heat pump application
Source demand
20
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Valve positions in the various rooms correct the demand setpoint in the central
function based on the number of valves between a value of 70...100%.
Description Name Default value
Setpoint correction, if 100% of all consumers are
within 70…100%.
SpCorrTFlHi 5 [K]
Setpoint correction, if 0% of all consumers are within
70…100%.
SpCorrTFlLo -5 [K]
20.16 Source demand
Each DXR2 automation station calculates heat pump source demand and
makes the result available through a group of the central function (supply chain
heat pump source).
The central function for its part, distributes source availability via the same
group to the rooms.
20.17 Preheating
The central functions can trigger the preheating function to heat up a room at
end of the night setback period as quickly as possible to the Pre-Comfort
setpoint. This impacts the plant operating mode of the application.
20.18 Emergency mode
The setpoint for protection ensures that room temperatures do not change
below or above a critical limit.
20.19 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
Demand correction by
collected valve
positions