AHU  Controller AHU3d4

Configuration Parameters

Earlier Issue controllers do not have OCDS

Issue 3c controllers do not have Humidity parameters or HCOK

ref Description default range
C1 SPAH Occupied setpoint (Return or Supply depending on SPTY) 20.0 10.0 to 35.0 degC
C2 SPDB Setpoint deadband 1.0 0.0 to 10.0 C
C3 SPTR setpoint trim 0 -10.0 to 10.0 C
C4 SPTY setpoint type (control mode)

0 setpoint from SPFC, occupancy control from 1 or more Zone Controllers

1 setpoint supervised from Zone Controller

2 Room control from Zone Controller(s), supply air setpoint from Heat%, Cool% between MAXS and MINS

3 Supply Air control from setpoint SPAH occupancy controlled from 1 or more Zone Controllers

4 as 3 but setpoint can be supervised from a selected Zone Controller

5 Supply Air control, setpoint ans occupancy from a master AHU controller (Slave AHU mode)

6 Return Air control, no supply air sensor, occupancy from one or more Zone Controllers

7 Return Air Control, no supply air sensor, setpoint supervision from one Zone Controller

1 0 to 7
C5 SPFR frost/fabric protect setpoint 10 0.0 to 20.0 C
C6 INMD Input mode allows use of trim pot and or occupation control

0 normal operation

1 Occupied is External AND normal occupation (window contact)

2 Occupied is External OR normal occupation (outside normal hours)

3 Occupation controlled by external signal only

0 0 to 3
C7 MAXS maximum supply air setpoint 30 0 to 70 C
C8 MINS minimum supply air setpoint 10 2 to 30C
C9 NTCL night cool doown setpoint 0 0 to 25.0 C
C10 MIND minimum demand 4 0 to 10%
C11 MRUN minimum run time 5 1 to 20 mins
C12 HPRD heating valve period or minimum on time depends on driver type 2 to 60 secs*10
C13 CPRD cooling valve period or minimum on time depends on driver type 2 to 60 secs*10
C14 SFRT supply fan starts first when set (1) 1 0 to 1
C15 OCCO run in Occupied period only when set 0 0 to 1
C16 RTRY retry delay after fan fail 0 0.0 to 24.0 hours
C17 HTSC heat source 0 0 to 100
C18 CLSC cool source 0 0 to 100
C19 OCDS occupation destination 0 0 to 100
C20 MXCT maximum CT setpoint to heat source when AHU demanding 100% 70 20 to 100 C
C21 MNCT minimum CT setpoint to heat source when AHU demanding 0% 30 20 to 100 C
C22 HSTG number of heat stages 2 1 to 5
C23 CSTG number of cool stages 2 1 to 5
C24 HCOK allow heat and cool demands at the same time for De-hum control 0 0 to 1
C25 ALRM alarm mode

0 ignore alarms

1 report alarms

2 report alarms, shut down all outputs on alarm

3 report alarms, shut down all outputs on STOP alarm or sensor fail alarm

1 0 to 3
C26 ALST not used 0 0 to 1


Monitoring Parameters

ref Description default range
INPUTS
I1 (C30) INPA input A fan fail 0 to 1
I2 (C31) INPB input B filter blocked 0 to 1
I3 (C32) RLYA relay A heat raise 0 to 1
I4 (C33) RLYB relay B heat lower 0 to 1
I5 (C34) RLYC relay C cool raise 0 to 1
I6 (C35) RLYD relay D cool lower 0 to 1
I7 (C36) SFAN relay E supply fan 0 to 1
I8 (C37) EFAN relay F extract fan 0 to 1
SWITCHES
W1

(C38)

AUTO Controller in automatic control
W2

(C39)

OVRD Override

W1 and W2 used together with Doorway Auto/manual dialog box

W3

(C40)

RSET reset AHU fan failure 0 to1
W7

(C44)

SERV remote initiation of registration button 0 to1
W8

(C45)

CGST remote initiation of registration button 0 to1
SENSORS
S1 (C50) SPLA supply air temperature 0 to 35.0C
S2 (C51) RTNA return air temperature 0 to 35.0 C
S3 (C52) HCOP Controller output -100 to 100
S4 (C53) INCL inter coil temperature 0 to 50.0 C
S5 (C54) OUTS Outside air temperature -30 to 35.0C
S6 (C55) SPSL current supply air setpoint 5 to 30.0 C
S7 (C56) SPRT current return air setpoint 5 to 30.0 C
S8 (C57) SPLH supply humidity 0 to 100.0%
S9 (C58) RTNH return humidity 0 to 100.0%
S10(C59) OUTH outside humidity 0 to 100.0%
KNOBS
K1 (C60) SPOC occupied setpoint 20.0 5.0 to 35.0 C
K2 (C61) SPFR non occupied setpoint 10.0 5.0 to 20.0 C
K3 (C62) SPSV supervised setpoint (from master) 0 0.0 to 50.0 C
K4 (C63) SPTR setpoint trim 0 -10.0 to 10.0 C
K5 (C64) RHSP relative humidity setpoint, zero setpoint disables de-humidification control 0 10 to 100 %RH
K6 (C65) RHDB relative humidity deadband 5 2 to 50 %RH

 

Control loop parameters

ref   Description default range
C69 RTLP selects display of Return loop parameters when set 0 0 to 1
C70 UNDH sets very Low muzzy level for heating loop 4.5 (1.00) 10 to 200
C71 OVRH sets very High muzzy level for heating loop 4.5 (1.00) 10 to 200
C72 DBBH deadband sets limit for OK band for heating loop 2.0 (5.0) 10 to 200
C73 RCGH max rate of change temperature   1 to 250
C74 GN H gain heating 30  (50) 1 to 250
C75 UNDC sets very Low muzzy level for cooling loop 4.5 (1.00) 10 to 200
C76 OVRC sets very High muzzy level for cooling loop 4.5 (1.00) 10 to 200
C77 DBBC deadband sets limit for OK band for cooling loop 2.0 (5.0) 10 to 200
C78 RCGC max rate of change temperature   1 to 250
C79 GN C gain cooling 30  (50) 1 to 250

Alarm Parameters

ref   Description default range
C90 NOAL no alarms 0 0 to 1
C91 FANF fan fail 0 0 to 1
C92 FLTF filter blocked 0 0 to 1
C93 FREZ heater battery failed or no hot water (will stop fans) 0 0 to 1
C94 OUTF no outside air reading available 0 0 to 1
C95 SUPF no valid supply air temperature reading 0 0 to 1
C96 STOP shut down due to master STOP alarm 0 0 to 1

Plot configuration

ref   Description default range
C130 PN A config variable number for channel A 51 0 to 255
C131 PT A period code for plot A 1 1 to 4
C132 PN B config variable number for channel B 52 0 to 255
C133 PT B period code for plot B 1 1 to 4
C134 PN C config variable number for channel C 53 0 to 255
C135 PT C period code for plot C 1 1 to 4

Driver Parameters

ref   Description default range
C150 HTYP heating driver type 1 0 to 5
C151 HINT number of internal heating stages 2 0 to 8
C152 CTYP cooling driver type 1 0 to 5
C153 CINT number of internal cooling stages 2 0 to 8
C154 HRMN heating driver input rescale minimum 0 0 to 100%
C155 HRMX heating driver input rescale maximum 100 0 to 100%
C156 CRMN cooling driver input rescale minimum 0 0 to 100%
C157 CRMX cooling driver input rescale maximum 100 0 to 100%