OSTBERG HERU 400-2400 S, User Manual

Page: 23 / 120

23 / 120
2018-02-13 Climatix HERU® 400-2400
CONTROL SYSTEM Function description
Pressure regulation
Duct pressure regulation, designed to be combined with VAV systems. The fans are
controlled to maintain a preset pressure (setpoint), via GP1 & GP2, in each duct
system.
Flow regulation
Flow regulation is designed to be used in systems where a constant flow is desired. The
fans are controlled to maintain a preset flow (setpoint), e.g. compensate for increased
filter clogging via GF1 & GF2.
Pressure regulation with flow measurement
This model can also be combined with one fan functioning as MASTER/duct pressure
regulation and the other fan as SLAVE/flow regulated.
Master/slave regulation requires GP1/GP2, GF1 & GF2.
Fan compensation
Fan compensation can be obtained via AIR QUALITY/HUMIDITY SENSOR GQ1/GM1
(duct or room model). The fan can be boosted to a higher flow at higher PPM/RH.
Pump monitoring
Monitoring carried out using current relay and feedback to PROC1. If the pump does
not draw current when the pump is in operation, an alarm will go off and heat
maintenance of the frost protection sensor will take over. Monitoring is possible for
both CP1 and CP2.
Direct expansion cooling unit
Can control 1-STAGE (ON/OFF)/ 2-STAGE stage-connected (50/50 stage)./ 3-STAGE
binary (1/3-2/3 stage).
Alarm from direct expansion cooling or operation indication from direct expansion
(DX) cooling.
Su/Wi switch
Summer-Winter switch, can switch between summer/winter from BMS system or via
supply pipe thermostat at COMBI COIL.