Klimor EVO-T COMPACT, Operation And Maintenance Manual

17

4.  DESCRIPTION OF SYSTEM OPERATION

Table No. 3 

Functions of AHU systems

Function

Actuation condition

Description of operation

Fan start

Set the operation mode
Speed 1, Speed 2, Standby, Timer

- External dampers open
- Turning on the air supply fan’s motor (air supply AHUs) or air supply/exhaust fans’ motors (air supply/exhaust AHUs)

Temper

atur

e adjustmen

t

Description

Set the operation mode
Speed 1, Speed 2, Standby, Timer

- Comparison of current temperature measured with the master sensor with the set value entered in the control-
ler as well as actuation of heat/cool exchangers
- Limiting of min and max temperature of supply air

Hea

ting

Water heater

Master adjustment sensor tem-
perature is below the set tem-
perature

- Increasing the medium (water or glycol solution) flow rate through the water heating coil
- Activation of anti-frost function if the temperature downstream the heater (thermostat) is too low

Electric heater

- Stepless power increase of the electric heater
- Cooling down the heater while switching from run into stop mode
- Monitoring of heater overheating with the thermostat

Cooling

Water cooling 
coil

Master adjustment sensor tempe-
rature is above the set temperature

- Increasing the medium (water or glycol solution) flow rate through the cooler

DX cooling coil

- Switching on the 1st, 2nd stage of the compressor unit 
- Cooling system initiation lock applied at low external temperatures (factory setting: 13°C)
- Min. time of compressor operation (even if the initiation signal is not fed) and min break time (even if the    
initiation signal is fed)

Ener

gy 

rec

ov

er

y syst

ems

Heat recovery

Set the operation mode
Speed 1, Speed 2, Standby,Timer

External temperature is 1K lower 
than air exhaust sensor tempe-
rature

- Initiation of the recovery system (START/STOP) 
- Activation of anti-frost function of the heat recovery system at low air exhaust temperature, downstream the 
heat recovery (cross-flow heat recovery – closing)

Recirculation chamber

Set the operation mode
Speed 1, Speed 2, Standby, Timer

Operation in the heating sequence 

- Stepless adjustment of air dampers’ opening using the actuators
- Mixing degree of the air extracted from the room with the external supplied air depends on the temperature difference 
measured with the air exhaust sensor and the set temperature
- Adjustment of air mixing degree is carried out before or after the adjustment of cooling and heating devices, depending 
on the priority setting for the mixing chamber or heater/cooler
- Activation of reheating function possible: if the ambient temperature is below the set temperature, the system 
switches into the heating sequence, the AHUs with recirculation will operate with minimal amount of fresh air (factory    
setting: min 30% external air damper opening), then the controller starts to adjust the temperature using the heater
- Manual setting possible